Re: panic with current

I think this is my fault. Will commit a fix some time today.

-Kip

On Thu, Apr 23, 2009 at 10:30 AM, Mike Tancsa <mike_at_sentex.net> wrote:
> At 12:20 PM 4/23/2009, Eygene Ryabinkin wrote:
>
>> Any chance to get backtrace from kgdb?
>
> Hi,
>        Not sure if its saving all the core file
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0x0
> stack pointer           = 0x28:0xe6ae3ca8
> frame pointer           = 0x28:0xe6ae3cd4
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                        = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 0 (em0 taskq)
> [thread pid 0 tid 100037 ]
> Stopped at      0:      *** error reading from address 0 ***
> db> bt full
> Symbol not found
> db> trace
> Tracing pid 0 tid 100037 td 0xc683d000
> taskqueue_run(3330884160,3330884188,3233963774,0,3233995830,...) at
> taskqueue_run+267
> taskqueue_thread_loop(3330913636,3870178616,3233985346,813,3235354336,...)
> at taskqueue_thread_loop+104
> fork_exit(3230203408,3330913636,3870178616) at fork_exit+184
> fork_trampoline() at fork_trampoline+8
> --- trap 0, eip = 0, esp = 3870178672, ebp = 0 ---
> db> panic
> panic: from debugger
> cpuid = 0
> Uptime: 8s
> Physical memory: 3046 MB
> Dumping 92 MB: 77 61 45 29 13
> Dump complete
> Automatic reboot in 15 seconds - press a key on the console to abort
> --> Press a key on the console to reboot,
> --> or switch off the system now.
> Rebooting...
>
>
>
> 0[i7]# kgdb /usr/obj/usr/src/sys/GENERIC/kernel.debug vmcore.4
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-marcel-freebsd"...
>
> Unread portion of the kernel message buffer:
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0x0
> stack pointer           = 0x28:0xe6ae3ca8
> frame pointer           = 0x28:0xe6ae3cd4
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                        = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 0 (em0 taskq)
> panic: from debugger
> cpuid = 0
> Uptime: 8s
> Physical memory: 3046 MB
> Dumping 92 MB: 77 61 45 29 13
>
> #0  doadump () at pcpu.h:246
> 246     pcpu.h: No such file or directory.
>        in pcpu.h
> (kgdb) bt
> #0  doadump () at pcpu.h:246
> #1  0xc085749e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:420
> #2  0xc0857772 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:576
> #3  0xc04bea47 in db_panic (addr=Could not find the frame base for
> "db_panic".
> ) at /usr/src/sys/ddb/db_command.c:478
> #4  0xc04bf071 in db_command (last_cmdp=0xc0d4985c, cmd_table=0x0,
> dopager=1) at /usr/src/sys/ddb/db_command.c:445
> #5  0xc04bf1ca in db_command_loop () at /usr/src/sys/ddb/db_command.c:498
> #6  0xc04c102d in db_trap (type=12, code=0) at
> /usr/src/sys/ddb/db_main.c:229
> #7  0xc08852c6 in kdb_trap (type=12, code=0, tf=0xe6ae3c68) at
> /usr/src/sys/kern/subr_kdb.c:534
> #8  0xc0b6699f in trap_fatal (frame=0xe6ae3c68, eva=0) at
> /usr/src/sys/i386/i386/trap.c:917
> #9  0xc0b66bd3 in trap_pfault (frame=0xe6ae3c68, usermode=0, eva=0) at
> /usr/src/sys/i386/i386/trap.c:839
> #10 0xc0b675c8 in trap (frame=0xe6ae3c68) at
> /usr/src/sys/i386/i386/trap.c:521
> #11 0xc0b4b21b in calltrap () at /usr/src/sys/i386/i386/exception.s:165
> #12 0x00000000 in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> (kgdb)
>
>
>
>
>
>
>
> _______________________________________________
> freebsd-current_at_freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"
>



-- 
All that is necessary for the triumph of evil is that good men do nothing.
    Edmund Burke