I'm using 11.1-STABLE (r326255) and this issue occurs from time to time
(usually the server crashes every day, or every few days.)
I believe the problem lays in a mechanism of memory freeing for the Jail subsystem.
I'm running few jails with vnet/vimage + PF filter in each.
Basically each jail is a small virtual router with simple nat (lan0->wan0 natting).
Could you please tell me what other info should I collect and attach to this bug?
FreeBSD hestia.ithouse.org.ua 11.1-STABLE FreeBSD 11.1-STABLE #9 r326255: Mon Nov 27 17:42:17 EET 2017 email@example.com:/usr/obj/usr/src/sys/HESTIA amd64
panic: page fault
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Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 4; apic id = 14
fault virtual address = 0x0
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80ab58dc
stack pointer = 0x28:0xfffffe0b59c5eb00
frame pointer = 0x28:0xfffffe0b59c5eb00
code segment = base rx0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 17 (pf purge)
trap number = 12
panic: page fault
cpuid = 4
KDB: stack backtrace:
#0 0xffffffff80abb987 at kdb_backtrace+0x67
#1 0xffffffff80a779f6 at vpanic+0x186
#2 0xffffffff80a77863 at panic+0x43
#3 0xffffffff80f4562d at trap_fatal+0x34d
#4 0xffffffff80f45689 at trap_pfault+0x49
#5 0xffffffff80f44eda at trap+0x29a
#6 0xffffffff80f28a71 at calltrap+0x8
#7 0xffffffff80cebde5 at pf_state_expires+0x75
#8 0xffffffff80ceb6b5 at pf_purge_expired_states+0xf5
#9 0xffffffff80ceb574 at pf_purge_thread+0x134
#10 0xffffffff80a3ad85 at fork_exit+0x85
#11 0xffffffff80f2905e at fork_trampoline+0xe
VNET is not supported on 11, and 11.1 went out of support back in September of last year as well.
I recognize the backtrace though, and it's fixed in 12.0. See #219251
*** This bug has been marked as a duplicate of bug 219251 ***