When I enable lockdep today on my pandaboard, the warning below[1] has been
triggered,
so the issue is surely related with block storage or filesystem.
[1], lockdep warning
[ 1202.199310] INFO: task updatedb.mlocat:6892 blocked for more than 120
seconds.
[ 1202.207519] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 1202.215789] updatedb.mlocat D c081d734 0 6892 6886 0x00000000
[ 1202.215850] [<c081d734>] (schedule+0x508/0x608) from [<c081d8cc>]
(io_schedule+0x98/0xf4)
[ 1202.215881] [<c081d8cc>] (io_schedule+0x98/0xf4) from [<c03281c4>]
(sync_buffer+0x58/0x60)
[ 1202.215911] [<c03281c4>] (sync_buffer+0x58/0x60) from [<c081e238>]
(__wait_on_bit+0x64/0xac)
[ 1202.215942] [<c081e238>] (__wait_on_bit+0x64/0xac) from [<c081e308>]
(out_of_line_wait_on_bit+0x88/0x94)
[ 1202.215972] [<c081e308>] (out_of_line_wait_on_bit+0x88/0x94) from
[<c0327f78>] (__wait_on_buffer+0xb8/0x144)
[ 1202.216003] [<c0327f78>] (__wait_on_buffer+0xb8/0x144) from [<c036f58c>]
(ext3_find_entry+0x1ec/0x3e8)
[ 1202.216033] [<c036f58c>] (ext3_find_entry+0x1ec/0x3e8) from [<c0370034>]
(ext3_lookup+0x3c/0xec)
[ 1202.216064] [<c0370034>] (ext3_lookup+0x3c/0xec) from [<c0304f64>]
(d_alloc_and_lookup+0x54/0x70)
[ 1202.216094] [<c0304f64>] (d_alloc_and_lookup+0x54/0x70) from [<c0306e58>]
(do_lookup+0x268/0x2a0)
[ 1202.216125] [<c0306e58>] (do_lookup+0x268/0x2a0) from [<c03074dc>]
(link_path_walk+0x5dc/0xa70)
[ 1202.216125] [<c03074dc>] (link_path_walk+0x5dc/0xa70) from [<c0307bc0>]
(do_path_lookup+0x54/0xe8)
[ 1202.216156] [<c0307bc0>] (do_path_lookup+0x54/0xe8) from [<c0308020>]
(user_path_at+0x68/0x9c)
[ 1202.216186] [<c0308020>] (user_path_at+0x68/0x9c) from [<c02fed14>]
(vfs_fstatat+0x44/0x74)
[ 1202.216217] [<c02fed14>] (vfs_fstatat+0x44/0x74) from [<c02fed70>]
(vfs_lstat+0x2c/0x30)
[ 1202.216247] [<c02fed70>] (vfs_lstat+0x2c/0x30) from [<c02fefe8>]
(sys_lstat64+0x24/0x40)
[ 1202.216278] [<c02fefe8>] (sys_lstat64+0x24/0x40) from [<c01d5b80>]
(ret_fast_syscall+0x0/0x48)
[ 1202.216308] 1 lock held by updatedb.mlocat/6892:
[ 1202.216308] #0: (&sb->s_type->i_mutex_key#11){+.+.+.}, at: [<c0306e34>]
do_lookup+0x244/0x2a0
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https://bugs.launchpad.net/bugs/784421
Title:
natty slow boot on pandaboard(rev A1)
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