While I was looking unused partitions to be used for ReiserFS testing
(paranoia is a way of life when dealing with my data ;-), I did
mount /dev/hda5 /mnt/tmp
to a partition which I thought to be unused (just to be sure). This resulted
in a Really Weird(tm) /mnt/tmp _file_ which didn't have any permissions to
anyone. When checking kernel messages, I found "EXT2-fs warning: checktime
reached, running e2fsck is recommended" line. Then I tried to unmount the
partition. It checkfaulted. Messages had following entries.
---cut
Jan 31 19:46:30 limbo kernel: EXT2-fs error (device ide0(3,5)): free_inode: reserved inode or nonexistent inode
Jan 31 19:46:30 limbo kernel: kernel BUG at inode.c:889!
Jan 31 19:46:30 limbo kernel: invalid operand: 0000
Jan 31 19:46:30 limbo kernel: CPU: 0
Jan 31 19:46:30 limbo kernel: EIP: 0010:[iput+205/336]
Jan 31 19:46:30 limbo kernel: EFLAGS: 00010282
Jan 31 19:46:30 limbo kernel: eax: 0000001b ebx: c7ce7180 ecx: cd536000 edx: c023a328
Jan 31 19:46:30 limbo kernel: esi: c023dde0 edi: c023dde0 ebp: c023de18 esp: c7c69f20
Jan 31 19:46:30 limbo kernel: ds: 0018 es: 0018 ss: 0018
Jan 31 19:46:30 limbo kernel: Process umount (pid: 1076, stackpage=c7c69000)
Jan 31 19:46:30 limbo kernel: Stack: c020954b c02095eb 00000379 c80b48c0 c7ce7180 c01413fe c7ce7180 cbb04e00
Jan 31 19:46:30 limbo kernel: c80b48c0 c01352ff c80b48c0 c88ed0c0 cbb04e00 00000000 080526c0 c013466a
Jan 31 19:46:30 limbo kernel: c0135731 cbb04e00 00000000 c88ed0c0 c023ce8c ffffffff cd07a000 c0135803
Jan 31 19:46:30 limbo kernel: Call Trace: [dput+238/336] [kill_super+63/304] [remove_vfsmnt+138/144] [do_umount+433/448] [sys_umount+195/240] [sys_munmap+43/64] [sys_oldumount+12/16]
Jan 31 19:46:30 limbo kernel: [system_call+51/56]
Jan 31 19:46:30 limbo kernel:
Jan 31 19:46:30 limbo kernel: Code: 0f 0b 83 c4 0c eb 6c 39 1b 74 38 f6 83 ec 00 00 00 07 75 26
---cut
I couldn't unmount that partition, but SysRq <Sync> <Unmount> <Boot> saved
all other partitions.
After reboot I fsck'd /dev/hda5 and it was seriously messed up. Actually it
was very likely once part of RAID array tests I did a while back (/dev/hda5
was 5GB but fsck said ext2 was a 6GB filesystem).
So ok, I did try to mount a seriously messed up filesystem, but it shouldn't
be possible in the first place or at least it shouldn't do that when I try to
umount.
// /
....................................Timo Jantunen ......................
ZZZ (Used to represent :Kuunsäde 8 A 28: Email: jeti@iki.fi :
the sound of a person snoring.) :02210 Espoo : http://iki.fi/jeti :
Webster's Encyclopedic Unabridged :Finland : GSM+358-40-5763131 :
Dictionary of the English Language :...............:....................:
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