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Subject[Bug] knfs

incoming/ was mounted via nfs. An ISO on that directory was mounted via
loopback to incoming/en. Then on the nfs server various things happened
that broke the nfs mount to incoming; specifically, incoming/iso was
created on the server (so that from the client's view there is the
server-side incoming/iso dir, and that directory is also the loopback
mount point for a file on the same nfs mount. Now when trying to unmount
the incoming dir, it says busy, since an iso was mounted from that dir.

Trying to unmount the iso was unsuccessful, presumably since that file
doesn't exist. Now it just dies peacefully:

# umount /mrtwig/incoming/iso
umount: /mrtwig/incoming/7.0-i386-disc1.iso: block devices not permitted
on fs

but during the first unmount, the kernel was a bit more upset:

# ls -l incoming incoming/iso
/usr/bin/ls: incoming: Permission denied
/usr/bin/ls: incoming/iso: Permission denied

# umount incoming/iso
kernel BUG at /usr/src/linux/include/linux/nfs_fs.h:164!
invalid operand: 0000
CPU: 0
EIP: 0010:[<d090e555>]
EFLAGS: 00010282
eax: 00000039 ebx: cece5c20 ecx: cfefd4e0 edx: 00000004
esi: cec7ace0 edi: ce0be6a0 ebp: ccd58120 esp: ca24df30
ds: 0018 es: 0018 ss: 0018
Process umount (pid: 20796, stackpage=ca24d000)
Stack: d0915165 d0915300 000000a4 cd259b00 cd82ad60 c012c7a0 ce0be6a0
cd676000 00000700 ccd58120 ffffffe7 d5924b8d cd676000 00000000
d5924fcb cd676000 00000700 c665fec0 00000000 00004c01 c0132c1c
Call Trace: [<d0915165>] [<d0915300>] [<c012c7a0>] [<d5924b8d>]
[<d5924fcb>] [<c0132c1c>] [<c0138e97>]
Code: 0f 0b 83 c4 0c 8d b6 00 00 00 00 85 db 74 0a 53 56 e8 1d 88
zsh: 20796 segmentation fault umount incoming/iso

d0915140 __insmod_nfs_S.rodata_L12759 [nfs]
d0918320 __insmod_nfs_S.data_L1324 [nfs]
d0918908 __insmod_nfs_S.bss_L4 [nfs]

d5925170 loop_register_transfer_Rd5e1e654 [loop]
d5925198 loop_unregister_transfer_Rbfee3ad5 [loop]
d5924060 __insmod_loop_S.text_L5286 [loop]
d5925540 __insmod_loop_S.rodata_L1507 [loop]
d5925ca0 __insmod_loop_S.data_L164 [loop]
d5925d44 __insmod_loop_S.bss_L12 [loop]


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