amd64/176835: Fatal trap 12: page fault while in kernel mode

[Martin Bishop]

The following reply was made to PR amd64/176835; it has been noted by GNATS.

From: Martin Bishop <martin.bishop at gmail.com>
To: bug-followup at FreeBSD.org, martin.bishop at gmail.com
Cc:  
Subject: Re: amd64/176835: Fatal trap 12: page fault while in kernel mode
Date: Sun, 17 Mar 2013 22:33:50 -0700

 After one more crash to enable dumping, and one to produce a core.
 
 Backtrace from kgdb
 
 (kgdb) bt
 #0  doadump (textdump=Variable "textdump" is not available.
 ) at pcpu.h:224
 #1  0xffffffff808ea3a1 in kern_reboot (howto=260) at
 /usr/src/sys/kern/kern_shutdown.c:448
 #2  0xffffffff808ea897 in panic (fmt=0x1 <Address 0x1 out of bounds>)
 at /usr/src/sys/kern/kern_shutdown.c:636
 #3  0xffffffff80bd8240 in trap_fatal (frame=0xc, eva=Variable "eva" is
 not available.
 ) at /usr/src/sys/amd64/amd64/trap.c:857
 #4  0xffffffff80bd857d in trap_pfault (frame=0xffffff80913118c0,
 usermode=0) at /usr/src/sys/amd64/amd64/trap.c:773
 #5  0xffffffff80bd8b9e in trap (frame=0xffffff80913118c0) at
 /usr/src/sys/amd64/amd64/trap.c:456
 #6  0xffffffff80bc315f in calltrap () at
 /usr/src/sys/amd64/amd64/exception.S:228
 #7  0xffffffff808eb0b3 in sigtd (p=0xfffffe00212d3000, sig=1,
 prop=Variable "prop" is not available.
 ) at /usr/src/sys/kern/kern_sig.c:1927
 #8  0xffffffff808efb14 in tdsendsignal (p=0xfffffe00212d3000, td=0x0,
 sig=1, ksi=0xffffff8091311a70) at /usr/src/sys/kern/kern_sig.c:2045
 #9  0xffffffff808f0b6d in killpg1 (td=0xfffffe00341278e0, sig=1,
 pgid=Variable "pgid" is not available.
 ) at /usr/src/sys/kern/kern_sig.c:1650
 #10 0xffffffff808f0de4 in sys_kill (td=0xfffffe00341278e0,
 uap=0xffffff8091311bb0) at /usr/src/sys/kern/kern_sig.c:1703
 #11 0xffffffff80bd7ae6 in amd64_syscall (td=0xfffffe00341278e0,
 traced=0) at subr_syscall.c:135
 #12 0xffffffff80bc3447 in Xfast_syscall () at
 /usr/src/sys/amd64/amd64/exception.S:387
 #13 0x00000008015dbc2c in ?? ()
 
 Any particular information to grab to make this easier to track down ?