Re: Patched gpsd and /dev/pps0 results in "sleeping thread" kernel panic

From: Craig Leres <>
Date: Tue, 31 Aug 2021 19:11:33 -0700
On 8/31/21 6:54 PM, Warner Losh wrote:
> Can you post a traceback? We recently tightened up the sleeping conditions
> and many of the panics are straight forward to fix

Is this sufficient?


toc2 4 # kgdb /boot/kernel/kernel /var/crash/vmcore.1
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Reading symbols from /boot/kernel/kernel...
Reading symbols from /boot/kernel.LBLNET/kernel.debug...

Unread portion of the kernel message buffer:
Sleeping thread (tid 101408, pid 2046) owns a non-sleepable lock
KDB: stack backtrace of thread 101408:
sched_switch() at sched_switch+0x630/frame 0xfffffe0070e4f760
mi_switch() at mi_switch+0xd4/frame 0xfffffe0070e4f790
sleepq_catch_signals() at sleepq_catch_signals+0x403/frame 
sleepq_timedwait_sig() at sleepq_timedwait_sig+0x14/frame 0xfffffe0070e4f820
_sleep() at _sleep+0x1b3/frame 0xfffffe0070e4f8a0
pps_ioctl() at pps_ioctl+0x298/frame 0xfffffe0070e4f8f0
ppsioctl() at ppsioctl+0x48/frame 0xfffffe0070e4f920
devfs_ioctl() at devfs_ioctl+0xb0/frame 0xfffffe0070e4f970
VOP_IOCTL_APV() at VOP_IOCTL_APV+0x7b/frame 0xfffffe0070e4f9a0
vn_ioctl() at vn_ioctl+0x16a/frame 0xfffffe0070e4fab0
devfs_ioctl_f() at devfs_ioctl_f+0x1e/frame 0xfffffe0070e4fad0
kern_ioctl() at kern_ioctl+0x2b7/frame 0xfffffe0070e4fb30
sys_ioctl() at sys_ioctl+0xfa/frame 0xfffffe0070e4fc00
amd64_syscall() at amd64_syscall+0x387/frame 0xfffffe0070e4fd30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0070e4fd30
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8004c899a, rsp = 
0x7fffdfdfc6a8, rbp = 0x7fffdfdfc730 ---
panic: sleeping thread
cpuid = 8
time = 1630456142
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
vpanic() at vpanic+0x17b/frame 0xfffffe005ab73b00
panic() at panic+0x43/frame 0xfffffe005ab73b60
propagate_priority() at propagate_priority+0x282/frame 0xfffffe005ab73b90
turnstile_wait() at turnstile_wait+0x30c/frame 0xfffffe005ab73be0
__mtx_lock_sleep() at __mtx_lock_sleep+0x199/frame 0xfffffe005ab73c70
ppcintr() at ppcintr+0x2a0/frame 0xfffffe005ab73c90
ithread_loop() at ithread_loop+0x23c/frame 0xfffffe005ab73cf0
fork_exit() at fork_exit+0x7e/frame 0xfffffe005ab73d30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe005ab73d30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 17m20s
Dumping 607 out of 12240 

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55      /usr/src/sys/amd64/include/pcpu_aux.h: No such file or directory.
(kgdb) bt
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=1) at ../../../kern/kern_shutdown.c:371
#2  0xffffffff80b83ada in kern_reboot (howto=260)
     at ../../../kern/kern_shutdown.c:451
#3  0xffffffff80b83f33 in vpanic (fmt=<optimized out>, ap=<optimized out>)
     at ../../../kern/kern_shutdown.c:880
#4  0xffffffff80b83d53 in panic (fmt=<unavailable>)
     at ../../../kern/kern_shutdown.c:807
#5  0xffffffff80be7152 in propagate_priority (td=0xfffff80196959740)
     at ../../../kern/subr_turnstile.c:228
#6  0xffffffff80be7d1c in turnstile_wait (ts=0xfffff8000357a780,
     owner=<optimized out>, queue=0) at ../../../kern/subr_turnstile.c:785
#7  0xffffffff80b62ca9 in __mtx_lock_sleep (c=0xfffff80003969bd0,
     v=<optimized out>) at ../../../kern/kern_mutex.c:654
#8  0xffffffff8086fcc0 in ppcintr (arg=0xfffff80003969b00)
     at ../../../dev/ppc/ppc.c:1546
#9  0xffffffff80b4637c in intr_event_execute_handlers (p=<optimized out>,
     ie=0xfffff800030d9d00) at ../../../kern/kern_intr.c:1143
#10 ithread_execute_handlers (p=<optimized out>, ie=0xfffff800030d9d00)
     at ../../../kern/kern_intr.c:1156
#11 ithread_loop (arg=0xfffff800039aa7e0) at ../../../kern/kern_intr.c:1236
#12 0xffffffff80b42e1e in fork_exit (
     callout=0xffffffff80b46140 <ithread_loop>, arg=0xfffff800039aa7e0,
     frame=0xfffffe005ab73d40) at ../../../kern/kern_fork.c:1080
#13 <signal handler called>
Received on Wed Sep 01 2021 - 02:11:33 UTC

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