[Bug 225528] Kernel panic pf purge

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225528

            Bug ID: 225528
           Summary: Kernel panic pf purge
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: andrei at fazik.net.ua

Hello all,

Issue faced by me looks like
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220830 , but I've checked and
changes are from that bug are present.

Fatal trap 12: page fault while in kernel mode
cpuid = 21; apic id = 33
fault virtual address   = 0x5400
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff824b2a05
stack pointer           = 0x28:0xfffffe046a004b00
frame pointer           = 0x28:0xfffffe046a004b20
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         = 16 (pf purge)
trap number             = 12
panic: page fault
cpuid = 21
KDB: stack backtrace:
#0 0xffffffff80aae527 at kdb_backtrace+0x67
#1 0xffffffff80a6c146 at vpanic+0x186
#2 0xffffffff80a6bfb3 at panic+0x43
#3 0xffffffff80ef5832 at trap_fatal+0x322
#4 0xffffffff80ef5889 at trap_pfault+0x49
#5 0xffffffff80ef50c6 at trap+0x286
#6 0xffffffff80ed9ce1 at calltrap+0x8
#7 0xffffffff824b22b4 at pf_purge_expired_states+0x124
#8 0xffffffff824b2144 at pf_purge_thread+0x154
#9 0xffffffff80a2f955 at fork_exit+0x85
#10 0xffffffff80eda21e at fork_trampoline+0xe


➜  crash uname -a
FreeBSD xxxx.xxxx 11.1-RELEASE-p6 FreeBSD 11.1-RELEASE-p6 #0 r328517: Sun Jan
28 22:22:54 EET 2018     andrei at tower.local:/usr/obj/usr/src/sys/MY  amd64

Custom kernel used, but the only one difference with GENERIC is "options
VIMAGE"
host is used for different jails managed by cbsd.
Panic usually occurs during startup or restart of jail or if tap device will be
added.

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