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SubjectINFO: task umount:1524 blocked for more than 120 seconds
From
I have a reproduceable problem  happening over here
with unmount and ext4
if I sudo cp -R xserver(all libs/apps from git)
to an external
SmartDsk FireLite
then after the cp is done
sudo umount /dev/sdb1

I get this:

type=1400 audit(1273526248.814:27): avc: denied { unmount } for
pid=1524 comm="umount" scontext=justin:staff_r:staff_sudo_t:s0
tcontext=system_u:object_r:fs_t:s0 tclass=filesystem
[ 360.669140] INFO: task umount:1524 blocked for more than 120 seconds.
[ 360.685771] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.702221] umount D 0000000000000000 0 1524 1472 0x00000080
[ 360.702227] ffff880080909c88 0000000000000086 ffff880080909da8
0000000000000000
[ 360.702233] ffff880080909fd8 ffff88013845c4a0 0000000000013fc0
ffff880080909fd8
[ 360.702238] 0000000000013fc0 0000000000013fc0 0000000000013fc0
0000000000013fc0
[ 360.702243] Call Trace:
[ 360.702252] [<ffffffff8106e3f4>] ? spin_unlock_irqrestore+0x9/0xb
[ 360.702266] [<ffffffff810fb214>] ? bdi_sched_wait+0x0/0xd
[ 360.702270] [<ffffffff810fb21d>] bdi_sched_wait+0x9/0xd
[ 360.702276] [<ffffffff813e2126>] __wait_on_bit+0x43/0x76
[ 360.702342] [<ffffffff813e21c2>] out_of_line_wait_on_bit+0x69/0x74
[ 360.702346] [<ffffffff810fb214>] ? bdi_sched_wait+0x0/0xd
[ 360.702350] [<ffffffff8106e3bd>] ? wake_bit_function+0x0/0x2e
[ 360.702356] [<ffffffff81051599>] ? wake_up_process+0x10/0x12
[ 360.702360] [<ffffffff810fc00b>] T.732+0x19/0x1b
[ 360.702364] [<ffffffff810fc06c>] bdi_sync_writeback+0x5f/0x66
[ 360.702368] [<ffffffff810fc090>] sync_inodes_sb+0x1d/0xde
[ 360.702373] [<ffffffff810ff04b>] __sync_filesystem+0x47/0x7e
[ 360.702377] [<ffffffff810ff229>] sync_filesystem+0x47/0x4b
[ 360.702382] [<ffffffff810e2df4>] generic_shutdown_super+0x22/0xf4
[ 360.702386] [<ffffffff810e2ee8>] kill_block_super+0x22/0x3a
[ 360.702390] [<ffffffff810e35f4>] deactivate_super+0x4c/0x64
[ 360.702394] [<ffffffff810f6221>] mntput_no_expire+0xb0/0xde
[ 360.702397] [<ffffffff810f679a>] sys_umount+0x2d9/0x304
[ 360.702402] [<ffffffff810e899e>] ? path_put+0x1d/0x21
[ 360.702408] [<ffffffff81024502>] system_call_fastpath+0x16/0x1b
[ 400.536564] ieee1394: Node changed: 0-01:1023 -> 0-00:1023
[ 400.536587] ieee1394: Node paused: ID:BUS[0-00:1023] GUID[00d0010d0001eaa9]
[ 403.551124] ieee1394: Node removed: ID:BUS[0-00:1023] GUID[00d0010d0001eaa9]
[ 403.551263] end_request: I/O error, dev sdb, sector 54795503
[ 403.564505] Aborting journal on device sdb1-8.
[ 403.577816] JBD2: I/O error detected when updating journal
superblock for sdb1-8.
[ 403.591168] journal commit I/O error


disk just sits there with the light on.

if I disconnect, then re execute mount,cp,umount
I can get this again:

[ 561.219470] type=1400 audit(1273526663.219:46): avc: denied {
create } for pid=1717 comm="cp" name="libpixman-1.so.0"
scontext=justin:staff_r:staff_t:s0 tcontext=justin:object_r:mnt_t:s0
tclass=lnk_file
[ 840.702375] INFO: task umount:1728 blocked for more than 120 seconds.
[ 840.702379] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 840.702382] umount D 0000000000000000 0 1728 1676 0x00000080
[ 840.702388] ffff8800808adc88 0000000000000086 ffff8800808adda8
0000000000000000
[ 840.702394] ffff8800808adfd8 ffff88012abed3e0 0000000000013fc0
ffff8800808adfd8
[ 840.702399] 0000000000013fc0 0000000000013fc0 0000000000013fc0
0000000000013fc0
[ 840.702404] Call Trace:
[ 840.702413] [<ffffffff810fb214>] ? bdi_sched_wait+0x0/0xd
[ 840.702418] [<ffffffff810fb21d>] bdi_sched_wait+0x9/0xd
[ 840.702424] [<ffffffff813e2126>] __wait_on_bit+0x43/0x76
[ 840.702428] [<ffffffff813e21c2>] out_of_line_wait_on_bit+0x69/0x74
[ 840.702432] [<ffffffff810fb214>] ? bdi_sched_wait+0x0/0xd
[ 840.702437] [<ffffffff8106e3bd>] ? wake_bit_function+0x0/0x2e
[ 840.702443] [<ffffffff81051599>] ? wake_up_process+0x10/0x12
[ 840.702447] [<ffffffff810fc00b>] T.732+0x19/0x1b
[ 840.702451] [<ffffffff810fc06c>] bdi_sync_writeback+0x5f/0x66
[ 840.702456] [<ffffffff810fc090>] sync_inodes_sb+0x1d/0xde
[ 840.702460] [<ffffffff810ff04b>] __sync_filesystem+0x47/0x7e
[ 840.702465] [<ffffffff810ff229>] sync_filesystem+0x47/0x4b
[ 840.702469] [<ffffffff810e2df4>] generic_shutdown_super+0x22/0xf4
[ 840.702473] [<ffffffff810e2ee8>] kill_block_super+0x22/0x3a
[ 840.702477] [<ffffffff810e35f4>] deactivate_super+0x4c/0x64
[ 840.702481] [<ffffffff810f6221>] mntput_no_expire+0xb0/0xde
[ 840.702485] [<ffffffff810f679a>] sys_umount+0x2d9/0x304
[ 840.702490] [<ffffffff810e899e>] ? path_put+0x1d/0x21
[ 840.702495] [<ffffffff81024502>] system_call_fastpath+0x16/0x1b


not sure what/when is the last good kernel, but can defiantly
reset a few to find one, then do a bisect on this.
(keep in mind I'll be leaving for a few days, so might do this
until over the weekend or something).



--
Justin P. Mattock


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