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Date:	Tue, 27 Oct 2009 22:19:51 +0100
From:	Pavel Machek <pavel@....cz>
To:	kernel list <linux-kernel@...r.kernel.org>
Subject: 2.6.32-rc5: surprise removal of USB mass storage, and whole system
 goes to hell


I did remove one harddrive w/o unmounting, and now the whole system
becomes unusable :-(: (whole dmesg attached).

Stuff like "sync" hangs, and I'll probably have to reboot soon.
								Pavel

usb 1-1:1.0: uevent
usb-storage 1-1:1.0: usb_probe_interface
usb-storage 1-1:1.0: usb_probe_interface - got id
scsi18 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 18
usb-storage: waiting for device to settle before scanning
drivers/usb/core/inode.c: creating file '018'
scsi 18:0:0:0: Direct-Access     HTS54106 0G9SA00               PQ: 0 ANSI: 2 CCS
sd 18:0:0:0: [sdc] 117210240 512-byte logical blocks: (60.0 GB/55.8 GiB)
sd 18:0:0:0: [sdc] Write Protect is off
sd 18:0:0:0: [sdc] Mode Sense: 3c 00 00 00
sd 18:0:0:0: [sdc] Assuming drive cache: write through
sd 18:0:0:0: Attached scsi generic sg1 type 0
sd 18:0:0:0: [sdc] Assuming drive cache: write through
 sdc: sdc1 sdc2 sdc4
usb-storage: device scan complete
sd 18:0:0:0: [sdc] Assuming drive cache: write through
sd 18:0:0:0: [sdc] Attached SCSI disk
usb 1-1:1.0: uevent
usb 1-1: uevent
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
kjournald starting.  Commit interval 5 seconds
EXT3 FS on sdc2, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
EXT3-fs error (device sdb2): ext3_find_entry: reading directory #2 offset 0
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
EXT3-fs error (device sdb2): ext3_find_entry: reading directory #2 offset 0
------------[ cut here ]------------
WARNING: at fs/buffer.c:1159 mark_buffer_dirty+0x80/0xa0()
Hardware name: 17097HU
Modules linked in:
Pid: 2110, comm: sh Not tainted 2.6.32-rc5-00154-gfbad3ad-dirty #83
Call Trace:
 [<c0791da9>] ? printk+0x18/0x1a
 [<c02b9110>] ? mark_buffer_dirty+0x80/0xa0
 [<c023113c>] warn_slowpath_common+0x6c/0xc0
 [<c02b9110>] ? mark_buffer_dirty+0x80/0xa0
 [<c02311a5>] warn_slowpath_null+0x15/0x20
 [<c02b9110>] mark_buffer_dirty+0x80/0xa0
 [<c02eeed4>] ext3_commit_super+0x44/0x80
 [<c02f01c8>] ext3_handle_error+0x48/0xb0
 [<c0791da9>] ? printk+0x18/0x1a
 [<c02f02f1>] ext3_error+0x51/0x60
 [<c02ece2d>] ext3_find_entry+0x5ad/0x6d0
 [<c02a96b4>] ? d_alloc+0x114/0x190
 [<c02ed73d>] ext3_lookup+0x3d/0x100
 [<c02a96d8>] ? d_alloc+0x138/0x190
 [<c029faf9>] do_lookup+0x199/0x1c0
 [<c02a12ed>] __link_path_walk+0x31d/0xd70
 [<c02a1f34>] path_walk+0x54/0xb0
 [<c02a2081>] do_path_lookup+0x51/0x60
 [<c02a2b1a>] user_path_at+0x4a/0x80
 [<c029b045>] vfs_fstatat+0x35/0x70
 [<c029b15b>] vfs_stat+0x1b/0x20
 [<c029b174>] sys_stat64+0x14/0x30
 [<c0255dc3>] ? lockdep_sys_exit+0x23/0x80
 [<c0202e5c>] ? sysenter_do_call+0x1e/0x31
 [<c0202e50>] sysenter_do_call+0x12/0x31
---[ end trace 4eaf1068b9a2a4ba ]---
EXT3-fs error (device sdb2): ext3_readdir: directory #2 contains a hole at offset 0
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task umount:21522 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
umount        D c8469eb4     0 21522  24889 0x00000000
 c8469ec8 00000046 00000002 c8469eb4 c2c01d64 00000000 c8469e6c c8469e7c
 508b0602 00013840 00000000 00000003 00000000 db18ac40 c0ad2d64 cd044680
 cd044908 c2c050c0 00000000 051c883d 00000046 cd044680 db18ac40 c8469eac
Call Trace:
 [<c07946fe>] ? rwsem_down_failed_common+0x2e/0x190
 [<c0794775>] rwsem_down_failed_common+0xa5/0x190
 [<c079487d>] rwsem_down_write_failed+0x1d/0x30
 [<c07948fe>] call_rwsem_down_write_failed+0x6/0x8
 [<c0793f67>] ? down_write+0x47/0x50
 [<c029a082>] ? deactivate_super+0x42/0x60
 [<c029a082>] deactivate_super+0x42/0x60
 [<c02ae1b8>] mntput_no_expire+0x98/0xc0
 [<c02ae49f>] sys_umount+0x4f/0x2e0
 [<c02ae749>] sys_oldumount+0x19/0x20
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task sync:21224 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sync          D e527dec8     0 21224  21221 0x00000000
 e527dedc 00000046 00000002 e527dec8 c2c01d64 00000000 c0224f96 00000000
 c14dbaa0 0001379f c2e050d0 0001379f c14dd6fc c2e05118 c0ad2d64 f61f3680
 f61f3908 c2c050c0 00000000 0519e6c9 00000000 00000001 00000001 00000000
Call Trace:
 [<c0224f96>] ? select_task_rq_fair+0x46/0x7e0
 [<c02b31b8>] bdi_sched_wait+0x8/0x10
 [<c07931e7>] __wait_on_bit+0x47/0x70
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c07932b8>] out_of_line_wait_on_bit+0xa8/0xc0
 [<c02b31b0>] ? bdi_sched_wait+0x0/0x10
 [<c0245820>] ? wake_bit_function+0x0/0x60
 [<c02b3222>] sync_inodes_sb+0x62/0x130
 [<c02b7250>] __sync_filesystem+0x20/0x60
 [<c02b7375>] sync_filesystems+0xe5/0x120
 [<c02b73fb>] sys_sync+0x1b/0x40
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.
INFO: task umount:21522 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
umount        D c8469eb4     0 21522  24889 0x00000000
 c8469ec8 00000046 00000002 c8469eb4 c2c01d64 00000000 c8469e6c c8469e7c
 508b0602 00013840 00000000 00000003 00000000 db18ac40 c0ad2d64 cd044680
 cd044908 c2c050c0 00000000 051c883d 00000046 cd044680 db18ac40 c8469eac
Call Trace:
 [<c07946fe>] ? rwsem_down_failed_common+0x2e/0x190
 [<c0794775>] rwsem_down_failed_common+0xa5/0x190
 [<c079487d>] rwsem_down_write_failed+0x1d/0x30
 [<c07948fe>] call_rwsem_down_write_failed+0x6/0x8
 [<c0793f67>] ? down_write+0x47/0x50
 [<c029a082>] ? deactivate_super+0x42/0x60
 [<c029a082>] deactivate_super+0x42/0x60
 [<c02ae1b8>] mntput_no_expire+0x98/0xc0
 [<c02ae49f>] sys_umount+0x4f/0x2e0
 [<c02ae749>] sys_oldumount+0x19/0x20
 [<c0202e50>] sysenter_do_call+0x12/0x31
INFO: lockdep is turned off.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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