DAHDI: spin lock (dahdi_timer_lock) too long; kernel panic

[ogogon]

Colleagues, tell me how to solve my problem - periodically the system reboots and the following messages appear in /var/log/messages:

kernel: spin lock 0xffffffff82b85d60    (dahdi_timer_lock) held by 0xfffff80045905000 (tid 100750) too long
kernel: panic: spin lock held too long

I use:

FreeBSD 12.2-RELEASE r366954 GENERIC  amd64
dahdi-2.4.0rc5_7
dahdi-kmod26-2.6.1.r10747_1
asterisk18-18.8.0_1

My hardware:
Digium Wildcard TE121 as "wcte12xp".
Here is file /usr/local/etc/dahdi/system.conf:

#
# DAHDI Configuration File
#
# This file is parsed by the DAHDI Configurator, dahdi_cfg
#
span=1,0,0,CCS,HDB3,CRC4
bchan=1-15,17-31
dchan=16
loadzone=us
defaultzone=us
echocanceller=mg2,1-15,17-31

Here is the initialization message:

dahdi: Version:
kernel: te12xp0: vendor=d161 device=8000 subvendor=ffffffff
kernel: te12xp0: <Wildcard TE121> port 0xd000-0xd0ff mem 0xf7520000-0xf75203ff irq 35 at device 8.0 on pci7
kernel: te12xp0: <6>Setting up global serial parameters for E1
kernel: te12xp0: <6>Found a Wildcard TE121
kernel: dahdi_echocan_mg2: Registered echo canceler 'MG2'
kernel: te12xp0: <6>Span configured for CCS/HDB3/CRC4
kernel: te12xp0: <6>Missed interrupt. Increasing latency to 5 ms in order to compensate.

Why am I getting this error and how can I fix it?

I would be grateful for your advice,
Ogogon.

 

[T-Daemon]

... periodically the system reboots and the following messages appear in /var/log/messages:

kernel: spin lock 0xffffffff82b85d60 (dahdi_timer_lock) held by 0xfffff80045905000 (tid 100750) too long
kernel: panic: spin lock held too long

There is a closed but unresolved bug report:

176984 – misc/dahdi-kmod: FreeBSD crashes periodically with RedFone FB2 and dahdi_dynamic_ethmf driver

bugs.freebsd.org

.
It looks like the bug is present since 9.1-RELEASE.

There seems to be a workaround in comment 2, not sure if it's a feasible solution for your hardware setup or valid for 12.2-RELEASE, and it doesn't resolve the problem, it decreases the appearance. See comment 4.

You might want to report the problem in the PR, so it can be reopened.

 

[drTr0jan]

I've same problem on stable/13-dd7b7807c periodically. But I haven't hardware card. I use DAHDI timer from misc/dahdi-kmod26 only for the Asterisk.

root@server:/var/crash# kgdb /boot/kernel/kernel /var/crash/vmcore.0
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Reading symbols from /boot/kernel/kernel...
Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...

Unread portion of the kernel message buffer:
spin lock 0xffffffff81e40360 (dahdi_timer_lock) held by 0xfffffe06bc0d1560 (tid 389351) too long
panic: spin lock held too long
cpuid = 8
time = 1684837826
KDB: stack backtrace:
#0 0xffffffff805f3795 at kdb_backtrace+0x65
#1 0xffffffff805aadc1 at vpanic+0x151
#2 0xffffffff805aac63 at panic+0x43
#3 0xffffffff80589c28 at _mtx_lock_indefinite_check+0x68
#4 0xffffffff805897d5 at _mtx_lock_spin_cookie+0xd5
#5 0xffffffff81e1f4bc at _process_masterspan+0x6c
#6 0xffffffff81e30725 at coretimer_func+0x1c5
#7 0xffffffff805c7523 at softclock_call_cc+0x133
#8 0xffffffff805c7989 at softclock+0x79
#9 0xffffffff8056cd7a at ithread_loop+0x25a
#10 0xffffffff80569b0e at fork_exit+0x7e
#11 0xffffffff8093e11e at fork_trampoline+0xe
ipmi0: Watchdog set returned 0xd5
Uptime: 147d13h51m44s
Dumping 20632 out of 261989 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55    __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcpu,