Filipe, FYI, yet another bisect result: commit 60efa5eb2e886852a0d5f9e1ffa7c896a1099da8 Author: Filipe David Borba Manana AuthorDate: Sat Feb 1 21:27:56 2014 +0000 Commit: Chris Mason 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