Date: Thu, 21 Nov 2002 14:15:13 -0500 From: Craig Rodrigues <rodrigc@attbi.com> To: freebsd-current@freebsd.org Subject: Debugging kernel panic, routetbl Message-ID: <20021121141513.A1596@attbi.com>
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Hi,
Can someone give me some ideas for how to debug a kernel
panic and isolate where the problem could be?
I've been trying out the Netgraph ATM stuff for a while,
and things have been working fine for a number of weeks.
However, when I cvsup'd -CURRENT from a few days ago,
I have one of my machines crashing after
route add is called on my ATM card.
The crash I am getting is soon after the ATM card is initialized
with ifconfig, and route add is called. This did not happen before,
and the ATM driver source that I am using has worked fine for weeks.
ddb gives me this message:
Memory modified after free 0x1383600(252)
panic: Most recently used by routetbl
And gdb over a serial port gives me this:
GNU gdb 5.2.1 (FreeBSD)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you ar=
e
welcome to change it and/or distribute copies of it under certain condition=
s.
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-undermydesk-freebsd"...
(kgdb) target /dev remote /dev/cuaa0
Remote debugging using /dev/cuaa0
Debugger (msg0x12 <Address 0x12 out of bounds>)
at /usr/src/sys/i386/i386/db_interface.c:323
323 }
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
warning: shared library handler failed to enable breakpoint
(kgdb) where
#0 Debugger (msg0x12 <Address 0x12 out of bounds>)
at /usr/src/sys/i386/i386/db_interface.c:323
#1 0xc031892b in panic (fmt0x1 <Address 0x1 out of bounds>)
at /usr/src/sys/kern/kern_shutdown.c:503
#2 0xc035b4b7 in bremfree (bp0xc2426868) at /usr/src/sys/kern/vfs_bio.c=
:632
#3 0xc035deb0 in getblk (vp0xc1368000, blkno196864, size16384, sl=
pflag0,
slptimeo0) at /usr/src/sys/kern/vfs_bio.c:2344
#4 0xc035b5ea in breadn (vp0xc1368000, blkno137438953490, size18,=
rablkno0x0, rabsize0x0, cnt0, cred0x0, bpp0x12)
at /usr/src/sys/kern/vfs_bio.c:690
#5 0xc035b59c in bread (vp0x12, blkno137438953490, size18, cred=
0x12,
bpp0x12) at /usr/src/sys/kern/vfs_bio.c:672
#6 0xc043a256 in ffs_update (vp0xc1367000, waitfor0)
at /usr/src/sys/ufs/ffs/ffs_inode.c:102
#7 0xc044dc5f in ffs_fsync (ap0xc5bbdb10)
at /usr/src/sys/ufs/ffs/ffs_vnops.c:315
#8 0xc044cece in ffs_sync (mp0xc135e000, waitfor2, cred0xc09f6e00=
,
td0xc0577100) at vnode_if.h:612
#9 0xc036f308 in sync (td0xc0577100, uap0x0)
at /usr/src/sys/kern/vfs_syscalls.c:138
#10 0xc031830c in boot (howto256) at /usr/src/sys/kern/kern_shutdown.c:2=
73
#11 0xc0318943 in panic () at /usr/src/sys/kern/kern_shutdown.c:517
#12 0xc04738bd in mtrash_ctor (mem0xc13e2d00, size32, arg0x0)
at /usr/src/sys/vm/uma_dbg.c:138
#13 0xc04722d7 in uma_zalloc_arg (zone0xc09d0140, udata0x0, flags0=
)
at /usr/src/sys/vm/uma_core.c:1358
#14 0xc030d0c6 in malloc (size4, type0xc05783e0, flags0)
at /usr/src/sys/kern/kern_malloc.c:182
#15 0xc02fbd35 in fdcopy (td0x12) at /usr/src/sys/kern/kern_descrip.c:12=
65
#16 0xc0304140 in fork1 (td0xc0a0c540, flags20, pages0, procp0x=
c5bbdcd4)
at /usr/src/sys/kern/kern_fork.c:446
#17 0xc0303872 in fork (td0xc0a0c540, uap0xc5bbdd10)
at /usr/src/sys/kern/kern_fork.c:122
#18 0xc04a763e in syscall (frame
{tf_fs 47, tf_es 47, tf_ds 47, tf_edi 0, tf_esi 1=
35254016, tf_ebp -1077937816, tf_isp -977543820, tf_ebx 0, tf_e=
dx 672047128, tf_ecx 3, tf_eax 2, tf_trapno 12, tf_err =
2, tf_eip 134723747, tf_cs 31, tf_eflags 514, tf_esp -10779=
37860, tf_ss 47})
at /usr/src/sys/i386/i386/trap.c:1033
#19 0xc049704d in Xint0x80_syscall () at {standard input}:140
#20 0x0804b326 in ?? ()
#21 0x0804ae8f in ?? ()
#22 0x0804aed7 in ?? ()
#23 0x0804aed7 in ?? ()
#24 0x0804b2a1 in ?? ()
#25 0x0804aeff in ?? ()
#26 0x0804aed7 in ?? ()
#27 0x0804bf6e in ?? ()
#28 0x0804af71 in ?? ()
#29 0x0804add9 in ?? ()
#30 0x0804b18d in ?? ()
#31 0x0804aef1 in ?? ()
#32 0x0804aed7 in ?? ()
#33 0x0804add9 in ?? ()
#34 0x0804add9 in ?? ()
#35 0x0804add9 in ?? ()
#36 0x0804b2a1 in ?? ()
#37 0x0804aeff in ?? ()
#38 0x08053767 in ?? ()
#39 0x0805364b in ?? ()
#40 0x0804814c in ?? ()
(kgdb) detach
Ending remote debugging.
(kgdb) quit
Script done on Wed Nov 20 04:13:05 2002
--
Craig Rodrigues
http://www.gis.net/~craigr
rodrigc@attbi.com
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