[Bug 256683] Fatal trap 12: page fault while in kernel mode

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256683

            Bug ID: 256683
           Summary: Fatal trap 12: page fault while in kernel mode
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: meetshamsher@gmail.com

Hi,
I am seeing below crash in 11.2 FreeBSD kernel. The same was working fine
earlier. It's getting continuous reboot.

Fatal trap 12: page fault while in kernel mode

cpuid = 1; apic id = 01

fault virtual address   = 0x0

fault code              = supervisor read data, page not present

instruction pointer     = 0x20:0xffffffff809238f0

stack pointer           = 0x28:0xffffffff812c4330

frame pointer           = 0x28:0xffffffff812c4350

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         = 0 (swapper)

trap number             = 12

panic: page fault

cpuid = 1



panic: page fault

KDB: stack backtrace:

db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffffff812c3ff0

vpanic() at vpanic+0x272/frame 0xffffffff812c4060

panic() at panic+0x43/frame 0xffffffff812c40c0

trap_fatal() at trap_fatal+0x35f/frame 0xffffffff812c4110

trap_pfault() at trap_pfault+0x49/frame 0xffffffff812c4150

trap() at trap+0x278/frame 0xffffffff812c4260

calltrap() at calltrap+0x8/frame 0xffffffff812c4260

--- trap 0xc, rip = 0xffffffff809238f0, rsp = 0xffffffff812c4330, rbp =
0xffffffff812c4350 ---

t17proc() at t17proc+0x100/frame 0xffffffff812c4350

dump_table() at dump_table+0x42/frame 0xffffffff812c4390

ip_load() at ip_load+0xa4/frame 0xffffffff812c43d0

mi_startup() at mi_startup+0x118/frame 0xffffffff812c43f0

btext() at btext+0x2c

Automatic reboot in 15 seconds - press a key on the console to abort

Rebooting...

Thanks & regards
Shamsher

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