Conference clt::cma

1508.0. "Troubles with DECthreads under Digital UNIX V3.2G" by TAEC::GALLERI () Fri Mar 21 1997 05:00

Hi guys,

We have a customer that has developped applications using our DECss7 APIs and numerous
threads for their own usage. From time to time, they bump into the following problem:
whilst applications are normally using only less than 5% of CPU, they come to a full
90+% CPU usage (and even up to 250% on a 3 CPUs machine !!!), but with no actual concrete
operations performed (I mean, it seems that some threads come to loop abnormally with
no apparent reason :-( [N.B.: machines are Alpha 2100 running Digital UNIX V3.2G]

By experience, we have seen this kind of behaviour being caused by thread stack overflow
[we would have prefered a more explicit behaviour, such a somehow signalling "Thread
Stack Overflow" somewhere, but ...] and the fact is that we achieved to go a bit further
by increasing the size of some of the application threads (namely, those related to DECss7)
from 32kb to more than 200kb, but the same misbehaviour still occurs at a different point.

Now, the questions:

1) Did you already hear of such kind of troubles with thread stack size ? Are there means
   to get a more usable error message related to thread stack overflow ?

2) Is there a mean by which we can configure either the OS or the DECthreads library to
   automatically allocate a stack with a user-defined size (much greater than 32kb) ?
   What do you think would be a more reasonable default stack size value ?

3) When the problem occurs, the customer attached to the process either through dbx or
   ladebug to try to find out what thoses threads were trying to do. We also call cma_debug(),
   but this appears to block at some point too. In the end, they tried to kill the process,
   but this appears to be difficult, and even impossible !?!? Indeed, the process revealed
   itself to be in a non-interruptible state ... I reproduce hereafter the output of a
   "dbx -k /vmunix" session I made to try to find out where those threads were in the kernel.
   It would be very interesting for us if someone can understand and deduce something
   useful from this mess ;-)

Generally speaking, my impression is that we need a bit (not to say more :-) of DECthreads
consultancy to be able to understand what's going on. That said, I (and our customer too,
of course !!!) cannot be satisfied by such behaviour of their applications. We definitely
need a more general and usable mean to troubleshoot such situation.

No use to tell you that this *VERY* urgent matter and that quick and efficient answers are
expected ;-)

Thank you very much for your attention,

Xav


[2] record output /tmp/vmunix.dbx (0 lines)
(dbx) 
Thread 0xfffffc000ab34b80:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff8056f4dc, 0x3ffc01e3500, 0xffffffffffffff35, 0x100)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc001fe13c00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x3, 0x3ffbfcc97f8, 0xa70c8, 0x41, 0x9d)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051c758, 0x3ffc01e3500, 0x80c020, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]
warning: thread 0xfffffc0010c25c00 appears to be swapped out

Thread 0xfffffc0010c25c00:
warning: thread 0xfffffc0010c25c00 appears to be swapped out
warning: thread 0xfffffc0010c25c00 appears to be swapped out
More (n if no)?More (n if no)?warning: thread 0xfffffc0010c25c00 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0010c25c00 appears to be swapped out
warning: thread 0xfffffc0010c25c00 appears to be swapped out
   1 msg_dequeue(0xfffffc0000200400, 0x28, 0x0, 0xfffffc001fe16000, 0xffffffffa2d178f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0xb0fa0, 0x0, 0x28, 0xc, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0xb0fa0, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc0001813800 appears to be swapped out

Thread 0xfffffc0001813800:
warning: thread 0xfffffc0001813800 appears to be swapped out
warning: thread 0xfffffc0001813800 appears to be swapped out
warning: thread 0xfffffc0001813800 appears to be swapped out
warning: thread 0xfffffc0001813800 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0001813800 appears to be swapped out
warning: thread 0xfffffc0001813800 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0xc0000, 0xffffffffa23bf8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]More (n if no)?More (n if
no)?   2 msg_receive_trap(0xbefa0, 0x0, 0x28, 0xf, 0x0) ["../../../../src/kernel/ker
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0xbefa0, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc0010c25000 appears to be swapped out

Thread 0xfffffc0010c25000:
warning: thread 0xfffffc0010c25000 appears to be swapped out
warning: thread 0xfffffc0010c25000 appears to be swapped out
warning: thread 0xfffffc0010c25000 appears to be swapped out
warning: thread 0xfffffc0010c25000 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0010c25000 appears to be swapped out
warning: thread 0xfffffc0010c25000 appears to be swapped out
   1 mpsleep(0xfffffc00134a4500, 0x11a, 0xfffffc00002564f8, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc00134a4500, 0x1, 0xfffffc000000011a, 0x0, 0xfffffc001ab06a00)
["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 sosbwait(0xfffffc00134a4560, 0xfffffc00134a4500, 0x0, 0xfffffc00134a4500, 0x3ffffff0168)
["../../../../src/kernel/bsd/uipc_socket2.c":668, 0xfffffc00002595d4]
   4 soreceive(0xffffffffa23cf6a0, 0x0, 0xffffffffa23cf768, 0xffffffffa23cc000, 0x0)
["../../../../src/kernel/bsd/uipc_socket.c":1390, 0xfffffc00002579a8]More (n if no)?More (n if
no)?   5 soo_read(0xffffffffa23cf708, 0x16, 0xfffffc001c0b9300, 0xfffffc000
   6 rwuio(0xfffffc000ab34210, 0xcf806, 0xffffffffa23cf8b8, 0xffffffffa23cf768, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1069, 0xfffffc00002523dc]
   7 read(0xfffffc0000002178, 0xffffffffa23cf758, 0x40c4789c60000000, 0x217800000001, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1021, 0xfffffc00002522e8]
   8 syscall(0x3, 0x3ffbfc9b2f0, 0xcd323, 0x41, 0x3)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]
   9 _Xsyscall(0x8, 0x3ff8051c018, 0x40000000ae0, 0x16, 0xcf5c4)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc0001813000:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff80574d44, 0x3ffc01e3500, 0xdd1c48, 0x1)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc0001812400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]More
(n if no)?More (n if no)?   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262,
0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]
warning: thread 0xfffffc0001812c00 appears to be swapped out

Thread 0xfffffc0001812c00:
warning: thread 0xfffffc0001812c00 appears to be swapped out
warning: thread 0xfffffc0001812c00 appears to be swapped out
warning: thread 0xfffffc0001812c00 appears to be swapped out
warning: thread 0xfffffc0001812c00 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0001812c00 appears to be swapped out
warning: thread 0xfffffc0001812c00 appears to be swapped out
   1 msg_dequeue(0xfffffc000065a121, 0x28, 0x0, 0x1e000, 0xffffffffa14278f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0xdf1580, 0x0, 0x28, 0x1b, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0xdf1580, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]

Thread 0xfffffc001ed60000:
More (n if no)?>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919,
0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff805895d8, 0x3ffc01e3500, 0xdd1c48, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc001647f400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc001647ec00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff805895d8, 0x3ffc01e3500, 0xdd1c48, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]More (n if no)?More (n if
no)?
Thread 0xfffffc001647e800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc001647f800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc001647fc00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 msg_dequeue(0x64, 0x28, 0x0, 0xdae000, 0xffffffffa164f8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]More (n if no)?More (n if
no)?   2 msg_receive_trap(0xe208a0, 0x0, 0x28, 0x2d, 0x0)
["../../../../src/kernel/kern/ipc_basic
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0xe208a0, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]

Thread 0xfffffc001647e000:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc001647f000:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff80589608, 0x3ffc01e3500, 0xdd1c48, 0xdd1c18)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc001aff7800:
More (n if no)?>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919,
0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x3ff8051ad30, 0x1, 0xffffffffffffffff, 0x21, 0x59)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051ad38, 0x14003ae70, 0x26, 0x5)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc001e08f800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x140035388, 0x1, 0x0, 0x21, 0x66)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051c0e8, 0x14003ae70, 0x9, 0xe41790)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc0009961400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x140035388, 0x1, 0x0, 0x21, 0x66)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051c0e8, 0x14003ae70, 0xb, 0xe49790)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]More (n if no)?More (n
if no)?
Thread 0xfffffc0009961c00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x140035388, 0x1, 0x0, 0x21, 0x66)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051c0e8, 0x14003ae70, 0xc, 0xe51790)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc0009961000:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x140035388, 0x1, 0x0, 0x21, 0x66)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051c0e8, 0x14003ae70, 0xf, 0xe59790)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc001e08fc00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x140035388, 0x1, 0x0, 0x21, 0x66)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]More (n if no)?More
(n if no)?   3 _Xsyscall(0x8, 0x3ff8051c0e8, 0x14003ae70, 0x11, 0xe61790)
["../../../../src/kernel/arch/alpha/l

Thread 0xfffffc0009960800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x140035388, 0x1, 0x0, 0x21, 0x66)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051c0e8, 0x14003ae70, 0x10, 0xe69790)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc0009960000:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff8051ad30, 0x14003ae70, 0x30, 0x5)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc0009960400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]More
(n if no)?More (n if no)?   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262,
0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc0014023800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc000b0bf800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]More (n if no)?More (n
if no)?
Thread 0xfffffc000dde5800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff8058915c, 0x3ffc01e3500, 0xe91580, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc001fe16c00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff80574c00, 0x3ffc01e3500, 0xdd1c48, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc000775f800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]More (n if
no)?More (n if no)?   3 exception_exit(0x8, 0x3ff805895d4, 0x3ffc01e3500, 0xdd1c48,
0x1414e93f8) ["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b

Thread 0xfffffc000775e400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x1200610b0, 0x14003ae70, 0x33, 0x5)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc000775f400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc000775ec00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]More
(n if no)?More (n if no)?   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262,
0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e5e0, 0x3ffc01e3500, 0x0, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]

Thread 0xfffffc000335b800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 syscall(0x3ff8051ad30, 0x1, 0xffffffffffffffff, 0x21, 0x59)
["../../../../src/kernel/arch/alpha/syscall_trap.c":658, 0xfffffc000047cb24]
   3 _Xsyscall(0x8, 0x3ff8051ad38, 0x14003ae70, 0x25, 0x5)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]

Thread 0xfffffc00197e1800:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff80574c00, 0x3ffc01e3500, 0xdd1c48, 0x1414e93f8)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]More (n if no)?More (n if
no)?warning: thread 0xfffffc001d956400 appears to be swapped out

Thread 0xfffffc001d956400:
warning: thread 0xfffffc001d956400 appears to be swapped out
warning: thread 0xfffffc001d956400 appears to be swapped out
warning: thread 0xfffffc001d956400 appears to be swapped out
warning: thread 0xfffffc001d956400 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
warning: thread 0xfffffc001d956400 appears to be swapped out
warning: thread 0xfffffc001d956400 appears to be swapped out
   1 mpsleep(0xfffffc000b5c4e00, 0x11a, 0xfffffc0000625f90, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc000b5c4e00, 0xffffffffa1e97720, 0xfffffc000000011a, 0x0,
0xfffffc000025a85c) ["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 accept1(0xfffffc000ab34210, 0xffffffffa1e978c8, 0xffffffffa1e978b8, 0x1,
0xffffffffa1e978b8) ["../../../../src/kernel/bsd/uipc_syscalls.c":374, 0xfffffc000025a8d8]
   4 oaccept(0xffffffffa1e978b8, 0x1, 0xffffffffa1e978b8, 0xfffffc0013203720,
0xfffffc000047c588) ["../../../../src/kernel/bsd/uipc_syscalls.c":319, 0xfffffc000025a7ac]
   5 syscall(0x13a1320, 0x0, 0x1, 0x30, 0x63)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]More (n if no)?More
(n if no)?   6 _Xsyscall(0x8, 0x3ff8051a5c8, 0x40000000ae0, 0x8, 0x13a1798)
["../../../../src/kernel/arch/alpha/l
warning: thread 0xfffffc001d957000 appears to be swapped out

Thread 0xfffffc001d957000:
warning: thread 0xfffffc001d957000 appears to be swapped out
warning: thread 0xfffffc001d957000 appears to be swapped out
warning: thread 0xfffffc001d957000 appears to be swapped out
warning: thread 0xfffffc001d957000 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001d957000 appears to be swapped out
warning: thread 0xfffffc001d957000 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0xfffffc0013203720, 0xffffffffa1e878f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x13b8c60, 0x0, 0x28, 0x72, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x13b8c60, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc001d957400 appears to be swapped out

Thread 0xfffffc001d957400:
warning: thread 0xfffffc001d957400 appears to be swapped out
More (n if no)?More (n if no)?warning: thread 0xfffffc001d957400 appears to be swapped out
warning: thread 0xfffffc001d957400 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001d957400 appears to be swapped out
warning: thread 0xfffffc001d957400 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0x140030000, 0xffffffffa1e378f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1a69330, 0x0, 0x28, 0x75, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1a69330, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc001d956000 appears to be swapped out

Thread 0xfffffc001d956000:
warning: thread 0xfffffc001d956000 appears to be swapped out
warning: thread 0xfffffc001d956000 appears to be swapped out
warning: thread 0xfffffc001d956000 appears to be swapped out
warning: thread 0xfffffc001d956000 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001d956000 appears to be swapped out
warning: thread 0xfffffc001d956000 appears to be swapped out
   1 msg_dequeue(0x0, 0x28, 0x0, 0x80000, 0xffffffffa1e7f8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]More (n if no)?More (n if
no)?   2 msg_receive_trap(0x1a81330, 0x0, 0x28, 0x78, 0x0)
["../../../../src/kernel/kern/ipc_basics
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1a81330, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc000d326400 appears to be swapped out

Thread 0xfffffc000d326400:
warning: thread 0xfffffc000d326400 appears to be swapped out
warning: thread 0xfffffc000d326400 appears to be swapped out
warning: thread 0xfffffc000d326400 appears to be swapped out
warning: thread 0xfffffc000d326400 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc000d326400 appears to be swapped out
warning: thread 0xfffffc000d326400 appears to be swapped out
   1 msg_dequeue(0x0, 0x28, 0x0, 0x72000, 0xffffffffa1e778f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1a99330, 0x0, 0x28, 0x7b, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1a99330, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc0017499c00 appears to be swapped out

Thread 0xfffffc0017499c00:
More (n if no)?warning: thread 0xfffffc0017499c00 appears to be swapped out
warning: thread 0xfffffc0017499c00 appears to be swapped out
warning: thread 0xfffffc0017499c00 appears to be swapped out
warning: thread 0xfffffc0017499c00 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0017499c00 appears to be swapped out
warning: thread 0xfffffc0017499c00 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0x3ffc01d0588, 0xffffffffa18678f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1ab1330, 0x0, 0x28, 0x7e, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1ab1330, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc000d327800 appears to be swapped out

Thread 0xfffffc000d327800:
warning: thread 0xfffffc000d327800 appears to be swapped out
warning: thread 0xfffffc000d327800 appears to be swapped out
warning: thread 0xfffffc000d327800 appears to be swapped out
warning: thread 0xfffffc000d327800 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
More (n if no)?More (n if no)?warning: thread 0xfffffc000d327800 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0x0, 0xffffffffa188f8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1ac9330, 0x0, 0x28, 0x81, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1ac9330, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc0017498c00 appears to be swapped out

Thread 0xfffffc0017498c00:
warning: thread 0xfffffc0017498c00 appears to be swapped out
warning: thread 0xfffffc0017498c00 appears to be swapped out
warning: thread 0xfffffc0017498c00 appears to be swapped out
warning: thread 0xfffffc0017498c00 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0017498c00 appears to be swapped out
warning: thread 0xfffffc0017498c00 appears to be swapped out
   1 msg_dequeue(0x0, 0x28, 0x0, 0xfffffc000ab340a0, 0xffffffffa189f8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1ae1330, 0x0, 0x28, 0x84, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1ae1330, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]More (n if no)?More (n
if no)?warning: thread 0xfffffc0017498000 appears to be swapped out

Thread 0xfffffc0017498000:
warning: thread 0xfffffc0017498000 appears to be swapped out
warning: thread 0xfffffc0017498000 appears to be swapped out
warning: thread 0xfffffc0017498000 appears to be swapped out
warning: thread 0xfffffc0017498000 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc0017498000 appears to be swapped out
warning: thread 0xfffffc0017498000 appears to be swapped out
   1 mpsleep(0xfffffc0016023a00, 0x11a, 0xfffffc0000625f90, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc0016023a00, 0xffffffffa18af720, 0xffffffff0000011a, 0x0,
0xfffffc000025a85c) ["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 accept1(0xfffffc000ab34210, 0xffffffffa18af8c8, 0xffffffffa18af8b8, 0x1, 0x0)
["../../../../src/kernel/bsd/uipc_syscalls.c":374, 0xfffffc000025a8d8]
   4 oaccept(0xffffffffa18af8b8, 0x1, 0x0, 0xfffffc000047d19c, 0xfffffc000047c588)
["../../../../src/kernel/bsd/uipc_syscalls.c":319, 0xfffffc000025a7ac]
   5 syscall(0x3, 0x3ffbfcada60, 0x0, 0x41, 0x63)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]
   6 _Xsyscall(0x8, 0x3ff8051a5c8, 0x3ffffef30d0, 0x17, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]More (n if no)?More (n
if no)?warning: thread 0xfffffc00117f7000 appears to be swapped out

Thread 0xfffffc00117f7000:
warning: thread 0xfffffc00117f7000 appears to be swapped out
warning: thread 0xfffffc00117f7000 appears to be swapped out
warning: thread 0xfffffc00117f7000 appears to be swapped out
warning: thread 0xfffffc00117f7000 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc00117f7000 appears to be swapped out
warning: thread 0xfffffc00117f7000 appears to be swapped out
   1 mpsleep(0xfffffc001ca55600, 0x11a, 0x18, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc001ca55600, 0x1, 0xfffffc000000011a, 0x0, 0xfffffc000ee49d00)
["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 sosbwait(0xfffffc001ca55660, 0xfffffc001ca55600, 0x0, 0xfffffc001ca55600, 0x18)
["../../../../src/kernel/bsd/uipc_socket2.c":668, 0xfffffc00002595d4]
   4 soreceive(0xfffffc0000436d34, 0x0, 0xffffffffa18b7768, 0xfffffc00002558d0, 0x0)
["../../../../src/kernel/bsd/uipc_socket.c":1390, 0xfffffc00002579a8]
   5 soo_read(0xffffffffa18b7708, 0x18, 0xfffffc001c0b9300, 0xfffffc000ab34688, 0x0)
["../../../../src/kernel/bsd/sys_socket.c":160, 0xfffffc00002525d4]
   6 rwuio(0xfffffc000ab34210, 0xffffffffa18b4000, 0xffffffffa18b78b8, 0xffffffffa18b7768, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1069, 0xfffffc00002523dc]More (n if no)?More (n if
no)?   7 read(0xfffffc0000000001, 0xffffffffa18b7758, 0x0, 0x100
   8 syscall(0x3, 0x3ffbfcae1f8, 0x6a, 0x41, 0x3)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]
   9 _Xsyscall(0x8, 0x3ff8051c018, 0x3ffffef30d0, 0x18, 0x1afd738)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]
warning: thread 0xfffffc0017499400 appears to be swapped out

Thread 0xfffffc0017499400:
warning: thread 0xfffffc0017499400 appears to be swapped out
warning: thread 0xfffffc0017499400 appears to be swapped out
warning: thread 0xfffffc0017499400 appears to be swapped out
warning: thread 0xfffffc0017499400 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
warning: thread 0xfffffc0017499400 appears to be swapped out
warning: thread 0xfffffc0017499400 appears to be swapped out
   1 mpsleep(0xfffffc001bb1ee00, 0x11a, 0x3a2, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc001bb1ee00, 0x1, 0xfffffc000000011a, 0x0, 0xfffffc0000460528)
["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 sosbwait(0xfffffc001bb1ee60, 0xfffffc001bb1ee00, 0x0, 0xfffffc001bb1ee00, 0x1)
["../../../../src/kernel/bsd/uipc_socket2.c":668, 0xfffffc00002595d4]
   4 soreceive(0xffffffffa18bf740, 0x0, 0xffffffffa18bf768, 0x0, 0x0)
["../../../../src/kernel/bsd/uipc_socket.c":1390, 0xfffffc00002579a8]More (n if no)?More (n if
no)?   5 soo_read(0xffffffffa18bf708, 0xe, 0xfffffc001c0b9300, 0xfffffc000ab34688, 0xfffff
   6 rwuio(0xfffffc000ab34210, 0x1, 0xffffffffa18bf8b8, 0xffffffffa18bf768, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1069, 0xfffffc00002523dc]
   7 read(0xfffffc0000000001, 0xffffffffa18bf758, 0xffffffffa18bf8b8, 0x100000001, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1021, 0xfffffc00002522e8]
   8 syscall(0x3, 0x3ff8051f174, 0x0, 0x0, 0x3)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]
   9 _Xsyscall(0x8, 0x3ff8051c018, 0x40000000ae0, 0xe, 0x1b14f08)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]
warning: thread 0xfffffc00117f6400 appears to be swapped out

Thread 0xfffffc00117f6400:
warning: thread 0xfffffc00117f6400 appears to be swapped out
warning: thread 0xfffffc00117f6400 appears to be swapped out
warning: thread 0xfffffc00117f6400 appears to be swapped out
warning: thread 0xfffffc00117f6400 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc00117f6400 appears to be swapped out
warning: thread 0xfffffc00117f6400 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0x18000, 0xffffffffa18c78f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]More (n if no)?More (n if
no)?   2 msg_receive_trap(0x1b2cbf0, 0x0, 0x28, 0x90, 0x0) ["../../../../src/kernel/
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1b2cbf0, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc00117f7400 appears to be swapped out

Thread 0xfffffc00117f7400:
warning: thread 0xfffffc00117f7400 appears to be swapped out
warning: thread 0xfffffc00117f7400 appears to be swapped out
warning: thread 0xfffffc00117f7400 appears to be swapped out
warning: thread 0xfffffc00117f7400 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc00117f7400 appears to be swapped out
warning: thread 0xfffffc00117f7400 appears to be swapped out
   1 mpsleep(0xfffffc001ca55300, 0x11a, 0xfffffc0000236dd1, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc001ca55300, 0x1, 0xfffffc000000011a, 0x0, 0x0)
["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 sosbwait(0xfffffc001ca55360, 0xfffffc001ca55300, 0x0, 0xfffffc001ca55300, 0x1)
["../../../../src/kernel/bsd/uipc_socket2.c":668, 0xfffffc00002595d4]
   4 soreceive(0xffffffffa18cf740, 0x0, 0xffffffffa18cf768, 0x0, 0x0)
["../../../../src/kernel/bsd/uipc_socket.c":1390, 0xfffffc00002579a8]
   5 soo_read(0xffffffffa18cf708, 0x19, 0xfffffc001c0b9300, 0xfffffc000ab34688,
0xffffffffa18cf740) ["../../../../src/kernel/bsd/sys_socket.c":160, 0xfffffc00002525d4
More (n if no)?More (n if no)?]
   6 rwuio(0xfffffc000ab34210, 0x0, 0xffffffffa18cf8b8, 0xffffffffa18cf768, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1069, 0xfffffc00002523dc]
   7 read(0xfffffc0000000001, 0xffffffffa18cf758, 0xffffffffa18cf8b8, 0x100000001, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1021, 0xfffffc00002522e8]
   8 syscall(0x3, 0x3ff8051f174, 0x0, 0x0, 0x3)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]
   9 _Xsyscall(0x8, 0x3ff8051c018, 0x40000000ae0, 0x19, 0x1b44f08)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]
warning: thread 0xfffffc001fe7b800 appears to be swapped out

Thread 0xfffffc001fe7b800:
warning: thread 0xfffffc001fe7b800 appears to be swapped out
warning: thread 0xfffffc001fe7b800 appears to be swapped out
warning: thread 0xfffffc001fe7b800 appears to be swapped out
warning: thread 0xfffffc001fe7b800 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001fe7b800 appears to be swapped out
warning: thread 0xfffffc001fe7b800 appears to be swapped out
   1 msg_dequeue(0x1f7b18, 0x28, 0x0, 0x3ffc01d0588, 0xffffffffa18d78f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1b5cbf0, 0x0, 0x28, 0x96, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]More (n if no)?More (n if
no)?   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1b5cbf0, 0x0)
["../../../../src/kernel/arch/alpha
warning: thread 0xfffffc001fe7bc00 appears to be swapped out

Thread 0xfffffc001fe7bc00:
warning: thread 0xfffffc001fe7bc00 appears to be swapped out
warning: thread 0xfffffc001fe7bc00 appears to be swapped out
warning: thread 0xfffffc001fe7bc00 appears to be swapped out
warning: thread 0xfffffc001fe7bc00 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001fe7bc00 appears to be swapped out
warning: thread 0xfffffc001fe7bc00 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0xfffffc0009a7db80, 0xffffffffa18df8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1b741c0, 0x0, 0x28, 0x99, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1b741c0, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":1249, 0xfffffc000046bd18]
warning: thread 0xfffffc001215c800 appears to be swapped out

Thread 0xfffffc001215c800:
warning: thread 0xfffffc001215c800 appears to be swapped out
More (n if no)?More (n if no)?warning: thread 0xfffffc001215c800 appears to be swapped out
warning: thread 0xfffffc001215c800 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001215c800 appears to be swapped out
warning: thread 0xfffffc001215c800 appears to be swapped out
   1 mpsleep(0xfffffc0008d0a300, 0x11a, 0x38, 0x0, 0x0)
["../../../../src/kernel/bsd/kern_synch.c":446, 0xfffffc000042c0c4]
   2 sosleep(0xfffffc0008d0a300, 0x1, 0xfffffc000000011a, 0x0, 0x0)
["../../../../src/kernel/bsd/uipc_socket2.c":692, 0xfffffc0000259668]
   3 sosbwait(0xfffffc0008d0a360, 0xfffffc0008d0a300, 0x0, 0xfffffc0008d0a300, 0x0)
["../../../../src/kernel/bsd/uipc_socket2.c":668, 0xfffffc00002595d4]
   4 soreceive(0xffffffffa18e7740, 0x0, 0xffffffffa18e7768, 0x3fffff2a8a0, 0x0)
["../../../../src/kernel/bsd/uipc_socket.c":1390, 0xfffffc00002579a8]
   5 soo_read(0xffffffffa18e7708, 0x1b, 0xfffffc001c0b9300, 0xfffffc000ab34688,
0xffffffffa18e7740) ["../../../../src/kernel/bsd/sys_socket.c":160, 0xfffffc00002525d4]
   6 rwuio(0xfffffc000ab34210, 0x0, 0xffffffffa18e78b8, 0xffffffffa18e7768, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1069, 0xfffffc00002523dc]
   7 read(0x8, 0xffffffffa18e7758, 0x0, 0x800000001, 0x0)
["../../../../src/kernel/bsd/sys_generic.c":1021, 0xfffffc00002522e8]
   8 syscall(0x1b87ea0, 0x1, 0x1, 0x21, 0x3)
["../../../../src/kernel/arch/alpha/syscall_trap.c":519, 0xfffffc000047c584]
   9 _Xsyscall(0x8, 0x3ff8051c018, 0x40000000ae0, 0x1b, 0x1b8c8b8)
["../../../../src/kernel/arch/alpha/locore.s":1094, 0xfffffc000046bbc4]More (n if no)?More (n
if no)?
Thread 0xfffffc000be68c00:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1cd5350, 0x100)
["../../../../src/kernel/arch/alpha/locore.s":1205, 0xfffffc000046bcb8]
warning: thread 0xfffffc001fe15800 appears to be swapped out

Thread 0xfffffc001fe15800:
warning: thread 0xfffffc001fe15800 appears to be swapped out
warning: thread 0xfffffc001fe15800 appears to be swapped out
warning: thread 0xfffffc001fe15800 appears to be swapped out
warning: thread 0xfffffc001fe15800 appears to be swapped out
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
warning: thread 0xfffffc001fe15800 appears to be swapped out
warning: thread 0xfffffc001fe15800 appears to be swapped out
   1 msg_dequeue(0xfffffc000046ba08, 0x28, 0x0, 0xfffffc0009a7db80, 0xffffffffa193f8f8)
["../../../../src/kernel/kern/ipc_basics.c":865, 0xfffffc00002cc448]
   2 msg_receive_trap(0x1d2b990, 0x0, 0x28, 0xa2, 0x0)
["../../../../src/kernel/kern/ipc_basics.c":1230, 0xfffffc00002ccc3c]More (n if no)?More (n if
no)?   3 _Xsyscall(0x8, 0x3ff8052e574, 0x3ffc01cb690, 0x1d2b990, 0x0)
["../../../../src/kernel/arch/alpha

Thread 0xfffffc001fe14400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931, 0xfffffc0000461594]
   1 thread_dowait(0xfffffc0001812400, 0x1, 0xfffffc001ca34600, 0xfffffc0000000000,
0xfffffc00002db2a8) ["../../../../src/kernel/kern/thread.c":2100, 0xfffffc00002ddcac]
   2 task_dowait(task = 0xfffffc000ab34030, must_wait = 179519488)
["../../../../src/kernel/kern/task.c":809, 0xfffffc00002db438]
   3 task_suspend_self(must_wait = 1) ["../../../../src/kernel/kern/task.c":1281,
0xfffffc00002dbe00]
   4 procfs_trace_signals(0xfffffc000ab34210, 0xffffffffa1977728, 0xffffffffa1977750,
0xffffffffa1977710, 0x4283d4) ["../../../../src/kernel/procfs/procfs_subrs.c":473,
0xfffffc00002843d0]
   5 psig(sig = 5) ["../../../../src/kernel/bsd/kern_sig.c":3846, 0xfffffc0000428e94]
   6 trap() ["../../../../src/kernel/arch/alpha/trap.c":1386, 0xfffffc000047dad4]
   7 _XentIF(0x8, 0x3ff80569ce4, 0x3ffffef30d0, 0x1, 0x141d79240)
["../../../../src/kernel/arch/alpha/locore.s":688, 0xfffffc000046b890]

Thread 0xfffffc001fe14c00:
More (n if no)?>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1931,
0xfffffc0000461594]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x3ff80567b00, 0x3ffc01e3500, 0xffffffffffffff35, 0xffffffffffffff35)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]

Thread 0xfffffc001fe15400:
>  0 thread_block() ["../../../../src/kernel/kern/sched_prim.c":1919, 0xfffffc0000461524]
   1 issig() ["../../../../src/kernel/bsd/kern_sig.c":3262, 0xfffffc0000427ad4]
   2 trap() ["../../../../src/kernel/arch/alpha/trap.c":1385, 0xfffffc000047dac0]
   3 exception_exit(0x8, 0x12004d05c, 0x14003ae70, 0x1d91b78, 0x0)
["../../../../src/kernel/arch/alpha/locore.s":839, 0xfffffc000046b9a8]
(dbx) 

    I put a reply in Digital UNIX, mainly with more questions. Let's
    decide were we want to conduct this discussion!