linux-kernel - [btrfs] INFO: task rb_producer:36 blocked for more than 120 seconds.

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Date:	Fri, 7 Feb 2014 12:38:31 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Filipe David Borba Manana <fdmanana@...il.com>
Cc:	Chris Mason <clm@...com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [btrfs] INFO: task rb_producer:36 blocked for more than 120 seconds.

Filipe,

FYI, yet another bisect result:

commit 60efa5eb2e886852a0d5f9e1ffa7c896a1099da8
Author:     Filipe David Borba Manana <fdmanana@...il.com>
AuthorDate: Sat Feb 1 21:27:56 2014 +0000
Commit:     Chris Mason <clm@...com>
CommitDate: Mon Feb 3 09:01:28 2014 -0800

    Btrfs: use late_initcall instead of module_init
    
+--------------------------------------------------+----+
|                                                  |    |
+--------------------------------------------------+----+
| boot_successes                                   | 0  |
| boot_failures                                    | 19 |
| INFO:task_blocked_for_more_than_seconds          | 19 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 19 |
| backtrace:ring_buffer_producer_thread            | 19 |
| backtrace:watchdog                               | 19 |
+--------------------------------------------------+----+

[    2.590324] BTRFS: selftest: Running find delalloc tests
[    2.648166] tsc: Refined TSC clocksource calibration: 2693.432 MHz
[   82.435914] random: nonblocking pool is initialized
[  241.651183] INFO: task rb_producer:36 blocked for more than 120 seconds.
[  241.652117]       Not tainted 3.14.0-rc1-wl-01205-gc94227b #2
[  241.652913] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  241.653998] rb_producer     D 8e7a6000  7320    36      2 0x00000000
[  241.654892]  8e7a9e3c 00000082 8e7a9e44 8e7a6000 8e7a6000 4ed642f1 00000007 8e7a8000
[  241.656146]  8e7a6000 00000046 00000000 00c0cc88 d053ca38 00000007 8f42cd24 00000000
[  241.657424]  8f42ccb8 8e7a9e14 81feb590 81ff7910 00000000 8e7a64dc 00000000 8e7a6000
[  241.658684] Call Trace:
[  241.659084]  [<8109ee47>] ? rb_reserve_next_event+0x1c7/0x450
[  241.659928]  [<81853445>] schedule+0x55/0x60
[  241.660557]  [<81852855>] schedule_timeout+0x15/0x1d0
[  241.661417]  [<81857402>] ? _raw_spin_unlock_irq+0x22/0x50
[  241.662204]  [<8106d664>] ? trace_hardirqs_on_caller+0x174/0x1f0
[  241.663033]  [<8106d6eb>] ? trace_hardirqs_on+0xb/0x10
[  241.663764]  [<81853c77>] wait_for_completion+0x77/0xc0
[  241.664531]  [<8105e8a0>] ? try_to_wake_up+0x140/0x140
[  241.665285]  [<810a1990>] ring_buffer_producer_thread+0x1a0/0x560
[  241.666132]  [<810a1c53>] ? ring_buffer_producer_thread+0x463/0x560
[  241.667020]  [<810a17f0>] ? wait_to_die+0x40/0x40
[  241.667690]  [<81054aaa>] kthread+0xaa/0xb0
[  241.668269]  [<81858477>] ret_from_kernel_thread+0x1b/0x28
[  241.669026]  [<81054a00>] ? __kthread_unpark+0x40/0x40
[  241.669766] no locks held by rb_producer/36.

git bisect start c94227bb600ead8cf8f7aa86ec870af2103ec312 38dbfb59d1175ef458d006556061adeaa8751b72 --
git bisect  bad f681c4d77876a580c42f1b57ea9a3f9a3bc1d34f  # 10:50      0-      4  Merge 'hid/for-next' into devel-hourly-2014020704
git bisect good f93665f5c3566da13a499d43cefc1e827a3b3ce8  # 10:58     20+      0  Merge 'microblaze/xnext/watchdog' into devel-hourly-2014020704
git bisect  bad 2a0a3885585a92b2b4ead5a040127b0865ebf0e6  # 11:04      0-     19  Merge 'acpi/next' into devel-hourly-2014020704
git bisect  bad 408a1e4884796a7c6c4d1975bfcc1898f387a736  # 11:09      0-      4  Merge 'shawnguo/imx/fixes' into devel-hourly-2014020704
git bisect  bad e4378a52ed4782fe3b631d6c67c38c8716ac197a  # 11:15      0-      9  Merge 'nfs/devel' into devel-hourly-2014020704
git bisect  bad 71c27a8c67e85b216f150696b04f698bff9256fa  # 11:22      0-      1  Merge tag 'regulator-v3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
git bisect  bad 878a876b2e10888afe53766dcca33f723ae20edc  # 11:28      0-      1  Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
git bisect good 88a78a912ee059467ae6db7429a6efe4654620a5  # 11:33     20+      0  Merge branch 'acl_fixes' into linux-next
git bisect  bad 60efa5eb2e886852a0d5f9e1ffa7c896a1099da8  # 11:40      0-     20  Btrfs: use late_initcall instead of module_init
git bisect good 0b947aff1599afbbd2ec07ada87b05af0f94cf10  # 11:42     20+      0  Btrfs: use btrfs_crc32c everywhere instead of libcrc32c
# first bad commit: [60efa5eb2e886852a0d5f9e1ffa7c896a1099da8] Btrfs: use late_initcall instead of module_init
git bisect good 0b947aff1599afbbd2ec07ada87b05af0f94cf10  # 11:46     60+      0  Btrfs: use btrfs_crc32c everywhere instead of libcrc32c
git bisect  bad c94227bb600ead8cf8f7aa86ec870af2103ec312  # 11:47      0-     19  0day head guard for 'devel-hourly-2014020704'
git bisect good 02853b2c52f8c42b03a8c8e1166411abbcf4c80e  # 11:52     60+      0  Revert "Btrfs: use late_initcall instead of module_init"
git bisect  bad 9343224bfd4be6a02e6ae0c0d66426c955c7d76e  # 11:59      0-      1  Merge branch 'akpm' (patches from Andrew Morton)
git bisect  bad 72569d9aa91b091268775ab1cd1b99cc3906f204  # 12:06      0-     53  Add linux-next specific files for 20140207

Thanks,
Fengguang

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