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Date:      Tue, 24 Sep 2019 11:15:11 +0300 (MSK)
From:      "Igor V. Ruzanov" <igorr@pochta-mx.canmos.ru>
To:        Christos Chatzaras <chris@cretaforce.gr>
Cc:        FreeBSD Mailing List <freebsd-questions@freebsd.org>,  freebsd-stable <freebsd-stable@freebsd.org>
Subject:   Re: help with crash dump
Message-ID:  <alpine.BSF.2.00.1909241114090.89354@pochta.canmos.ru>
In-Reply-To: <EB69B296-29ED-4443-A972-0DCBA1713806@cretaforce.gr>
References:  <EB69B296-29ED-4443-A972-0DCBA1713806@cretaforce.gr>

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


|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
|GNU gdb (GDB) 8.3 [GDB v8.3 for FreeBSD]
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|This GDB was configured as "x86_64-portbld-freebsd12.0".
|Type "show configuration" for configuration details.
|For bug reporting instructions, please see:
|<http://www.gnu.org/software/gdb/bugs/>.
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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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