[Bug 223959] page fault

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223959

            Bug ID: 223959
           Summary: page fault
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: zeon at zeon.kiev.ua

Hello,

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?

Appreciated.


FreeBSD hestia.ithouse.org.ua 11.1-STABLE FreeBSD 11.1-STABLE #9 r326255: Mon
Nov 27 17:42:17 EET 2017    
root at hestia.ithouse.org.ua:/usr/obj/usr/src/sys/HESTIA  amd64

panic: page fault

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This GDB was configured as "amd64-marcel-freebsd"...

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 0x0, 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
Uptime: 1d11h53m3s

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