Re: panic with current

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)