Date: Sun, 27 Apr 2008 18:07:33 -0700 From: Garrett Cooper <yanefbsd@gmail.com> To: Garrett Cooper <yanefbsd@gmail.com> Cc: current@freebsd.org Subject: Re: Panic on attempt to kern_stat / mount bad fs Message-ID: <078878C9-2A7C-4B14-81F6-0E7F9D305305@gmail.com> In-Reply-To: <17A30EF3-B488-494B-94C2-5108EC6EF07A@gmail.com> References: <17A30EF3-B488-494B-94C2-5108EC6EF07A@gmail.com>
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On Apr 27, 2008, at 5:52 PM, Garrett Cooper wrote:
> Trying to use more of my harddisk, I formatted 2 labels I previously =20=
> fdisked on my machine (note that there wasn't a modification in MBRs =20=
> or slices, just partitions).
>
> Later on, I was recompiling my kernel and world recently and my =20
> machine took a nose dive (panicked) partway through. The machine =20
> rebooted by itself (to my surprise) and subsequently panicked again =20=
> attempting to mount one of the newly formatted filesystems.
>
> I quickly logged in locally, removed the 1/2 filesystems from my =20
> fstab automount list and rebooted yet again. After that, and once I =20=
> removed background_fsck_enable=3DYES from rc.conf, everything appears =20=
> to be smooth sailing (knock on wood).
>
> I have 2 vmcore's that I can debug with: one from the first panic =20
> and another from the 2nd panic.
>
> (I had to rebuild the kernel after I removed apcupsd as I have a USB =20=
> kbd and apcupsd provides uhid -- well, sort of...).
>
> optimus# uname -a
> FreeBSD optimus 8.0-CURRENT FreeBSD 8.0-CURRENT #14: Sun Apr 27 =20
> 17:09:22 PDT 2008 root@optimus:/usr/obj/usr/src/sys/OPTIMUS i386
>
> I'll provide more info when requested.
>
> Thanks,
> -Garrett
Looks like there might be some missing error checking logic in the fs =20=
area:
optimus# kgdb -c /var/crash/vmcore.0 /boot/kernel.old/kernel
kgdb: kvm_nlist(_stopped_cpus):
kgdb: kvm_nlist(_stoppcbs):
[GDB will not be able to debug user-mode threads: /usr/lib/=20
libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and =20
you are
welcome to change it and/or distribute copies of it under certain =20
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for =20
details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
panic: ufs_dirbad: /scratch: bad dir ino 2 at offset 0: mangled entry
Uptime: 9d16h44m22s
Physical memory: 2038 MB
Dumping 250 MB: 235 219 203 187 171 155 139 123 107 91 75 59 43 27 11
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) up 10
#10 0xc062c17b in kern_stat (td=3D0xc53c5000, path=3D0xbfbfe2d4 <Address =
=20
0xbfbfe2d4 out of bounds>, pathseg=3DUIO_USERSPACE, sbp=3D0xe7debc18) at =
/=20
usr/src/sys/kern/vfs_syscalls.c:2109
2109 if ((error =3D namei(&nd)) !=3D 0)
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0xc05b52c5 in boot (howto=3D260) at /usr/src/sys/kern/=20
kern_shutdown.c:409
#2 0xc05b54d4 in panic (fmt=3DVariable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc06e2b97 in ufs_dirbad (ip=3D0x0, offset=3D0, how=3D0xc0795460 =20
"mangled entry") at /usr/src/sys/ufs/ufs/ufs_lookup.c:598
#4 0xc06e3b5c in ufs_lookup (ap=3D0xe7deba04) at /usr/src/sys/ufs/ufs/=20=
ufs_lookup.c:288
#5 0xc0750f02 in VOP_CACHEDLOOKUP_APV (vop=3D0xc07d0360, a=3D0xe7deba04) =
=20
at vnode_if.c:153
#6 0xc0618390 in vfs_cache_lookup (ap=3D0xe7deba84) at vnode_if.h:83
#7 0xc07528d1 in VOP_LOOKUP_APV (vop=3D0xc07d0880, a=3D0xe7deba84) at =20=
vnode_if.c:99
#8 0xc061e4fc in lookup (ndp=3D0xe7debba8) at vnode_if.h:57
#9 0xc061f143 in namei (ndp=3D0xe7debba8) at /usr/src/sys/kern/=20
vfs_lookup.c:219
#10 0xc062c17b in kern_stat (td=3D0xc53c5000, path=3D0xbfbfe2d4 <Address =
=20
0xbfbfe2d4 out of bounds>, pathseg=3DUIO_USERSPACE, sbp=3D0xe7debc18) at =
/=20
usr/src/sys/kern/vfs_syscalls.c:2109
#11 0xc062c315 in stat (td=3D0xc53c5000, uap=3D0xe7debcfc) at =
/usr/src/sys/=20
kern/vfs_syscalls.c:2093
#12 0xc073c423 in syscall (frame=3D0xe7debd38) at =
/usr/src/sys/i386/i386/=20
trap.c:1008
#13 0xc0726b60 in Xint0x80_syscall () at /usr/src/sys/i386/i386/=20
exception.s:196
#14 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) up
#11 0xc062c315 in stat (td=3D0xc53c5000, uap=3D0xe7debcfc) at =
/usr/src/sys/=20
kern/vfs_syscalls.c:2093
2093 error =3D kern_stat(td, uap->path, UIO_USERSPACE, &sb);
(kgdb) p *uap
$1 =3D {path_l_ =3D 0xe7debcfc "?=E2=BF=BF?=D8=BF?Z", path =3D =
0xbfbfe2d4 <Address =20
0xbfbfe2d4 out of bounds>, path_r_ =3D 0xe7debd00 "?=D8=BF?Z", ub_l_ =3D =
=20
0xe7debd00 "?=D8=BF?Z", ub =3D 0xbfbfd8d4, ub_r_ =3D 0xe7debd04 "Z"}
(kgdb)=
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