[Bug 220611] Fatal trap 12: page fault while in kernel mode (ip6_forward -> log)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220611

            Bug ID: 220611
           Summary: Fatal trap 12: page fault while in kernel mode
                    (ip6_forward -> log)
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jeroenschutrup at hotmail.nl

Created attachment 184239
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=184239&action=edit
core.txt

I've encountered this panic now for the 10th time. After enabling pf and
loading the rules, it takes a couple of days (sometimes 2, another time 8), to
hit this bug. Also had this bug on FreeBSD 10.1.


============================================================================
Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 03
fault virtual address   = 0x28
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80a0c71b
stack pointer           = 0x28:0xfffffe0000359fa0
frame pointer           = 0x28:0xfffffe0000359fb0
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         = 12 (irq269: igb0:que 3)
trap number             = 12
panic: page fault
cpuid = 3
KDB: stack backtrace:
#0 0xffffffff8098e7e0 at kdb_backtrace+0x60
#1 0xffffffff809514b6 at vpanic+0x126
#2 0xffffffff80951383 at panic+0x43
#3 0xffffffff80d5646b at trap_fatal+0x36b
#4 0xffffffff80d5676d at trap_pfault+0x2ed
#5 0xffffffff80d55dea at trap+0x47a
#6 0xffffffff80d3bdb2 at calltrap+0x8
#7 0xffffffff80995ecc at kvprintf+0xf9c
#8 0xffffffff8099692d at _vprintf+0x8d
#9 0xffffffff80994c2c at log+0x5c
#10 0xffffffff80b24a17 at ip6_forward+0x107
#11 0xffffffff819d94be at pf_refragment6+0x16e
#12 0xffffffff819cb1f3 at pf_test6+0x1023
#13 0xffffffff819d315d at pf_check6_out+0x1d
#14 0xffffffff80a25354 at pfil_run_hooks+0x84
#15 0xffffffff820187db at bridge_pfil+0x25b
#16 0xffffffff8201970b at bridge_broadcast+0x22b
#17 0xffffffff820193ef at bridge_forward+0x20f


Thanks,
Jeroen

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