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Old 09-07-2008, 12:36 PM
"Adam Borowski"
 
Default Bug#498134: (no subject)

Package: linux-image-2.6.26-1-vserver-686
Version: 2.6.26-4
Severity: important

It appears that copy-on-write links don't always work, sometimes resulting
in a lock up. They are supposed to work this way:

echo "foo" >a
ln a b
setattr --iunlink a
# Now both files are immutable but will break away on a write attempt.
echo "bar" >>a
# The files should be separated now...

Alas, this is not enough to reproduce.


-- Package-specific info:
** Version:
Linux version 2.6.26-1-vserver-686 (Debian 2.6.26-4) (waldi@debian.org) (gcc version 4.1.3 20080623 (prerelease) (Debian 4.1.2-23)) #1 SMP Thu Aug 28 15:12:13 UTC 2008

** Not tainted

** Kernel log:
[478478.685620] INFO: task bash:15850 blocked for more than 120 seconds.
[478478.685651] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[478478.685687] bash D e7af588b 0 15850 15848
[478478.685714] f79d0140 00000082 7fffffff e7af588b 0001952e f79d02cc c180c140 00000000
[478478.685761] f741da80 dcbdfdf4 00000002 00000000 dcbdfdf4 00000000 e8524fe9 ee65bb44
[478478.685820] ed859e60 ed859e68 ed859e64 f79d0140 c02ec62c d99e5e0c ed859e68 f79d0140
[478478.685878] Call Trace:
[478478.685958] [<c02ec62c>] __mutex_lock_slowpath+0x50/0x7b
[478478.686002] [<c02ec4c2>] mutex_lock+0xa/0xb
[478478.689522] [<c01849d4>] lookup_create+0x14/0x75
[478478.690491] [<c01867dc>] cow_break_link+0xd3/0x3f9
[478478.690491] [<f8b7d9e6>] jfs_permission+0x0/0xa [jfs]
[478478.690491] [<c0183c9a>] permission+0x1ff/0x239
[478478.690491] [<c01858cb>] __link_path_walk+0xa9d/0xb7f
[478478.690491] [<c011a636>] __wake_up+0x29/0x39
[478478.690491] [<c019078e>] mntput_no_expire+0x13/0xd9
[478478.690491] [<c0185a14>] path_walk+0x67/0x70
[478478.690491] [<c018c973>] __d_lookup+0x98/0xf6
[478478.690491] [<c0183859>] __lookup_hash+0x3c/0xdf
[478478.690491] [<c0186e47>] do_filp_open+0x345/0x6d3
[478478.690491] [<c0132616>] remove_wait_queue+0xc/0x34
[478478.690491] [<c022da7c>] tty_ldisc_deref+0x4c/0x5b
[478478.690491] [<c017b726>] do_sys_open+0x40/0xb0
[478478.690491] [<c017b7da>] sys_open+0x1e/0x23
[478478.690491] [<c0103853>] sysenter_past_esp+0x78/0xb1
[478478.690491] =======================

-- System Information:
Debian Release: lenny/sid
APT prefers testing
APT policy: (501, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-1-vserver-686 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash



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