Public bug reported:
Installed lucid (fully upgraded) in a new computer. There's a program
(amule) that consistently hangs up after some time (typically one or two
hours). When this happens, its window becomes unresponsive and any
attempts to kill it are fruitless. It also typically uses 100% cpu
according to top. Killing the window with xkill closes the windows but
the process remains.
I have this same setup in an older computer where this does not happen,
so I suspect that the new one being an i5 could have something to do.
$ ps l `pidof amule`
F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
0 1000 6156 1 20 0 141192 42252 coredu Dl ? 14:23 amule
$ sudo kill -9 `pidof amule`; sleep 5s; ps l `pidof amule`
F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND
0 1000 6156 1 20 0 141192 42252 coredu Dl ? 14:23 amule
$ uname -a
Linux tacitus 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010
i686 GNU/Linux
$ cat /proc/version_signature
Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
I attach dmesg, but these extracted messages could have something to do:
[44749.526602] INFO: task amule:6177 blocked for more than 120 seconds.
[44749.526606] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[44749.526608] amule D 00000b53 0 6177 1 0x00000008
[44749.526612] f1817f18 00200086 f19be000 00000b53 00000000 c0848760 efd94f2c
c0848760
[44749.526618] 74ba1350 00002783 c0848760 c0848760 efd94f2c c0848760 c0848760
c10c7800
[44749.526622] 00000001 00002783 efd94c80 f1b68578 f1b6857c ffffffff f1817f44
c058c1f6
[44749.526627] Call Trace:
[44749.526636] [<c058c1f6>] __mutex_lock_slowpath+0xd6/0x140
[44749.526638] [<c058c105>] mutex_lock+0x25/0x40
[44749.526644] [<c0208b6c>] generic_file_llseek+0x2c/0x70
[44749.526647] [<c0208b40>] ? generic_file_llseek+0x0/0x70
[44749.526650] [<c02083b7>] vfs_llseek+0x37/0x50
[44749.526652] [<c0208c0e>] sys_llseek+0x5e/0x90
[44749.526656] [<c01033ec>] syscall_call+0x7/0xb
** Affects: ubuntu
Importance: Undecided
Status: New
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Unresponsive process cannot be killed (sudo kill -9)
https://bugs.launchpad.net/bugs/665211
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