help with crash dump

Igor V. Ruzanov igorr at
Tue Sep 24 08:09:35 UTC 2019

What kernel modules do you load with this kernel? (show the list via 

|Randomly every few weeks / months one of the servers I manage gets a panic. It doesn't happen on the same server every time.
|I run FreeBSD stable compiled on 2 September 2019 but it did happen with previous versions too and if I remember correctly it did happen with FreeBSD 11 too.
|I don't have /usr/lib/debug/kernel files (I delete them to save some space) but I can recompile a new kernel / userland if it's needed.
|Any idea what the issue is?
|kgdb /boot/kernel/kernel ./vmcore.0
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|Reading symbols from /boot/kernel/kernel...
|(No debugging symbols found in /boot/kernel/kernel)
|0xffffffff80bff56a in sched_switch ()
|(kgdb) bt
|#0  0xffffffff80bff56a in sched_switch ()
|#1  0xffffffff80bd9be2 in mi_switch ()
|#2  0xffffffff80c29175 in sleepq_catch_signals ()
|#3  0xffffffff80c28caf in sleepq_wait_sig ()
|#4  0xffffffff80bd960a in _sleep ()
|#5  0xffffffff80c64e02 in solisten_dequeue ()
|#6  0xffffffff80c6c763 in kern_accept4 ()
|#7  0xffffffff80c6ca40 in accept1 ()
|#8  0xffffffff810a48b4 in amd64_syscall ()
|#9  <signal handler called>
|#10 0x0000000800ad68ca in ?? ()
|Backtrace stopped: Cannot access memory at address 0x7ffffffee648
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