[Bug 575749] Re: umount buffer overflow

[Adam Porter]

I also found this in dmesg:

[165000.520156] INFO: task umount:9355 blocked for more than 120 seconds.
[165000.520164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[165000.520171] umount        D 00000000ffffffff     0  9355   9354 0x00000000
[165000.520183]  ffff880019dffd98 0000000000000086 0000000000015bc0 0000000000015bc0
[165000.520194]  ffff8800be399ab0 ffff880019dfffd8 0000000000015bc0 ffff8800be3996f0
[165000.520204]  0000000000015bc0 ffff880019dfffd8 0000000000015bc0 ffff8800be399ab0
[165000.520215] Call Trace:
[165000.520232]  [<ffffffff811650d0>] ? bdi_sched_wait+0x0/0x20
[165000.520241]  [<ffffffff811650de>] bdi_sched_wait+0xe/0x20
[165000.520251]  [<ffffffff8153f3af>] __wait_on_bit+0x5f/0x90
[165000.520259]  [<ffffffff811650d0>] ? bdi_sched_wait+0x0/0x20
[165000.520267]  [<ffffffff8153f458>] out_of_line_wait_on_bit+0x78/0x90
[165000.520277]  [<ffffffff81085360>] ? wake_bit_function+0x0/0x40
[165000.520284]  [<ffffffff81165094>] ? bdi_queue_work+0xa4/0xe0
[165000.520293]  [<ffffffff8116640f>] bdi_sync_writeback+0x6f/0x80
[165000.520301]  [<ffffffff81166440>] sync_inodes_sb+0x20/0x30
[165000.520309]  [<ffffffff81169f12>] __sync_filesystem+0x82/0x90
[165000.520317]  [<ffffffff81169ff9>] sync_filesystems+0xd9/0x130
[165000.520326]  [<ffffffff8115ece1>] sys_umount+0xb1/0xd0
[165000.520337]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b

-- 
umount buffer overflow
https://bugs.launchpad.net/bugs/575749
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