Ok all of these symptoms are believed to be triggered by a hang during
swapon. Here we are trying to add swap in a file directly on a FAT
filesystem. Looking at a system suffering this issue we see the
following:
[ 236.224024] INFO: task swapon:8293 blocked for more than 120 seconds.
[ 236.224028] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 236.224031] swapon D ebbb4000 0 8293 8278
[ 236.224035] d8823e58 00000082 c06d3380 ebbb4000 c0193c92 ebb2de00
c0687340 c07b4500
[ 236.224040] d8834b60 d8834dd8 c180d600 c06d5400 c180d600 16bb60b6
0000000f d8834dd8
[ 236.224044] 00000000 c06d9f8c f6963a10 f6963a14 ffffffff d8823e80
c0501c1e d8834b60
[ 236.224048] Call Trace:
[ 236.224056] [<c0193c92>] ? buffered_rmqueue+0x1a2/0x2a0
[ 236.224060] [<c0501c1e>] __mutex_lock_slowpath+0x6e/0xb0
[ 236.224063] [<c0501a57>] mutex_lock+0x17/0x20
[ 236.224078] [<f8c7999f>] _fat_bmap+0x1f/0x50 [fat]
[ 236.224086] [<f8c79980>] ? _fat_bmap+0x0/0x50 [fat]
[ 236.224089] [<c01cf301>] bmap+0x31/0x40
[ 236.224092] [<c01abe9e>] setup_swap_extents+0x16e/0x400
[ 236.224096] [<c01ac6fa>] ? sys_swapon+0x5ca/0x820
[ 236.224099] [<c01ac7a2>] sys_swapon+0x672/0x820
[ 236.224102] [<c01beaba>] ? __fput+0x14a/0x1c0
[ 236.224106] [<c01bb5da>] ? sys_close+0x7a/0xc0
[ 236.224109] [<c0103f6b>] sysenter_do_call+0x12/0x2f
Seems that we have hung during the attempt to map the blocks we are going to
use for swap.
Looking at upstream it appears there is a modification to the locking in this
routine which would previously have caused such a deadlock:
commit 3a95ea1155c5d44aa58dde2f64f0ddafe27fd1fb
Author: OGAWA Hirofumi <hirof...@mail.parknet.co.jp>
Date: Thu Mar 12 02:03:23 2009 +0900
Fix _fat_bmap() locking
On swapon() path, it has already i_mutex. So, this uses i_alloc_sem
instead of it.
Signed-off-by: OGAWA Hirofumi <hirof...@mail.parknet.co.jp>
Reported-by: Laurent GUERBY <laur...@guerby.net>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
This commit is missing in the Jaunty kernel. Will pull this back to Jaunty
and get some test kernels built.
--
installing ubuntu stoped on "installing system" on 0% without any progress for
half an hour
https://bugs.launchpad.net/bugs/376120
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