[Bug 241133] page fault in ng_l2tp_seq_rack_timeout

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241133

            Bug ID: 241133
           Summary: page fault in ng_l2tp_seq_rack_timeout
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd at zivillian.de

I'm using mpd5 to run an L2TP Server on FreeBSD. This crash is currently
happening at least once within 24 hours.

At first I discovered this on the client side within pfSense
(https://redmine.pfsense.org/issues/9058).

Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address      = 0x1c
fault code         = supervisor read data, page not present
instruction pointer        = 0x20:0xffffffff80b79f76
stack pointer              = 0x28:0xfffffe0094a7ca60
frame pointer              = 0x28:0xfffffe0094a7caa0
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            = 369 (ng_queue1)
trap number                = 12
panic: page fault
cpuid = 2
KDB: stack backtrace:
#0 0xffffffff80b3d517 at kdb_backtrace+0x67
#1 0xffffffff80af6ab7 at vpanic+0x177
#2 0xffffffff80af6933 at panic+0x43
#3 0xffffffff80f7827f at trap_fatal+0x35f
#4 0xffffffff80f782d9 at trap_pfault+0x49
#5 0xffffffff80f77aa7 at trap+0x2c7
#6 0xffffffff80f5803c at calltrap+0x8
#7 0xffffffff82835bf4 at ng_l2tp_seq_rack_timeout+0x164
#8 0xffffffff8282868d at ng_apply_item+0xcd
#9 0xffffffff8282b084 at ngthread+0x1a4
#10 0xffffffff80aba033 at fork_exit+0x83
#11 0xffffffff80f58f6e at fork_trampoline+0xe
Uptime: 12h56m8s
Dumping 1124 out of 1999 MB:..2%..12%..22%..32%..42%..52%..62%..72%..82%..92%
Dump complete

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