On 02/14/2016 11:42 PM, Roman Mamedov wrote: > FWIW I had a persistently repeating deadlock on 4.1 and 4.3, but > after upgrade to 4.4 it no longer happens.
Apparently also with 4.4 there is some sort of blocking happening ... just at 38580: ---- cut ---- [Wed Feb 17 16:43:48 2016] INFO: task btrfs-cleaner:38580 blocked for more than 120 seconds. [Wed Feb 17 16:43:48 2016] Not tainted 4.4.0-customkernel #1 [Wed Feb 17 16:43:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [Wed Feb 17 16:43:48 2016] btrfs-cleaner D ffff882c27295dc0 0 38580 2 0x00000000 [Wed Feb 17 16:43:48 2016] ffff882c16fa6480 ffff88161a980280 ffff882a3d744000 ffff882a3d743df8 [Wed Feb 17 16:43:48 2016] ffff8815fead7104 ffff882c16fa6480 00000000ffffffff ffff8815fead7108 [Wed Feb 17 16:43:48 2016] ffffffff81559a31 ffff8815fead7100 ffffffff81559cba ffffffff8155b5a0 [Wed Feb 17 16:43:48 2016] Call Trace: [Wed Feb 17 16:43:48 2016] [<ffffffff81559a31>] ? schedule+0x31/0x80 [Wed Feb 17 16:43:48 2016] [<ffffffff81559cba>] ? schedule_preempt_disabled+0xa/0x10 [Wed Feb 17 16:43:48 2016] [<ffffffff8155b5a0>] ? __mutex_lock_slowpath+0x90/0x110 [Wed Feb 17 16:43:48 2016] [<ffffffff8155b63b>] ? mutex_lock+0x1b/0x30 [Wed Feb 17 16:43:48 2016] [<ffffffffa01bf51e>] ? btrfs_delete_unused_bgs+0xee/0x3f0 [btrfs] [Wed Feb 17 16:43:48 2016] [<ffffffff81559396>] ? __schedule+0x286/0x8f0 [Wed Feb 17 16:43:48 2016] [<ffffffffa01c6ff7>] ? cleaner_kthread+0x1a7/0x200 [btrfs] [Wed Feb 17 16:43:48 2016] [<ffffffffa01c6e50>] ? check_leaf+0x340/0x340 [btrfs] [Wed Feb 17 16:43:48 2016] [<ffffffff8108df6f>] ? kthread+0xcf/0xf0 [Wed Feb 17 16:43:48 2016] [<ffffffff8108dea0>] ? kthread_park+0x50/0x50 [Wed Feb 17 16:43:48 2016] [<ffffffff8155d74f>] ? ret_from_fork+0x3f/0x70 [Wed Feb 17 16:43:48 2016] [<ffffffff8108dea0>] ? kthread_park+0x50/0x50 [Wed Feb 17 17:23:48 2016] INFO: task btrfs-cleaner:38580 blocked for more than 120 seconds. [Wed Feb 17 17:23:48 2016] Not tainted 4.4.0-customkernel #1 [Wed Feb 17 17:23:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [Wed Feb 17 17:23:48 2016] btrfs-cleaner D ffff881627a35dc0 0 38580 2 0x00000000 [Wed Feb 17 17:23:48 2016] ffff882c16fa6480 ffff88161a956f00 ffff882a3d744000 ffff882a3d743df8 [Wed Feb 17 17:23:48 2016] ffff8815fead7104 ffff882c16fa6480 00000000ffffffff ffff8815fead7108 [Wed Feb 17 17:23:48 2016] ffffffff81559a31 ffff8815fead7100 ffffffff81559cba ffffffff8155b5a0 [Wed Feb 17 17:23:48 2016] Call Trace: [Wed Feb 17 17:23:48 2016] [<ffffffff81559a31>] ? schedule+0x31/0x80 [Wed Feb 17 17:23:48 2016] [<ffffffff81559cba>] ? schedule_preempt_disabled+0xa/0x10 [Wed Feb 17 17:23:48 2016] [<ffffffff8155b5a0>] ? __mutex_lock_slowpath+0x90/0x110 [Wed Feb 17 17:23:48 2016] [<ffffffff8155b63b>] ? mutex_lock+0x1b/0x30 [Wed Feb 17 17:23:48 2016] [<ffffffffa01bf51e>] ? btrfs_delete_unused_bgs+0xee/0x3f0 [btrfs] [Wed Feb 17 17:23:48 2016] [<ffffffff81559396>] ? __schedule+0x286/0x8f0 [Wed Feb 17 17:23:48 2016] [<ffffffffa01c6ff7>] ? cleaner_kthread+0x1a7/0x200 [btrfs] [Wed Feb 17 17:23:48 2016] [<ffffffffa01c6e50>] ? check_leaf+0x340/0x340 [btrfs] [Wed Feb 17 17:23:48 2016] [<ffffffff8108df6f>] ? kthread+0xcf/0xf0 [Wed Feb 17 17:23:48 2016] [<ffffffff8108dea0>] ? kthread_park+0x50/0x50 [Wed Feb 17 17:23:48 2016] [<ffffffff8155d74f>] ? ret_from_fork+0x3f/0x70 [Wed Feb 17 17:23:48 2016] [<ffffffff8108dea0>] ? kthread_park+0x50/0x50 [Wed Feb 17 17:57:48 2016] INFO: task btrfs-cleaner:38580 blocked for more than 120 seconds. [Wed Feb 17 17:57:48 2016] Not tainted 4.4.0-customkernel #1 [Wed Feb 17 17:57:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [Wed Feb 17 17:57:48 2016] btrfs-cleaner D ffff881627a95dc0 0 38580 2 0x00000000 [Wed Feb 17 17:57:48 2016] ffff882c16fa6480 ffff88161a980fc0 ffff882a3d744000 ffff882a3d743df8 [Wed Feb 17 17:57:48 2016] ffff8815fead7104 ffff882c16fa6480 00000000ffffffff ffff8815fead7108 [Wed Feb 17 17:57:48 2016] ffffffff81559a31 ffff8815fead7100 ffffffff81559cba ffffffff8155b5a0 [Wed Feb 17 17:57:48 2016] Call Trace: [Wed Feb 17 17:57:48 2016] [<ffffffff81559a31>] ? schedule+0x31/0x80 [Wed Feb 17 17:57:48 2016] [<ffffffff81559cba>] ? schedule_preempt_disabled+0xa/0x10 [Wed Feb 17 17:57:48 2016] [<ffffffff8155b5a0>] ? __mutex_lock_slowpath+0x90/0x110 [Wed Feb 17 17:57:48 2016] [<ffffffff8155b63b>] ? mutex_lock+0x1b/0x30 [Wed Feb 17 17:57:48 2016] [<ffffffffa01bf51e>] ? btrfs_delete_unused_bgs+0xee/0x3f0 [btrfs] [Wed Feb 17 17:57:48 2016] [<ffffffff81559396>] ? __schedule+0x286/0x8f0 [Wed Feb 17 17:57:48 2016] [<ffffffffa01c6ff7>] ? cleaner_kthread+0x1a7/0x200 [btrfs] [Wed Feb 17 17:57:48 2016] [<ffffffffa01c6e50>] ? check_leaf+0x340/0x340 [btrfs] [Wed Feb 17 17:57:48 2016] [<ffffffff8108df6f>] ? kthread+0xcf/0xf0 [Wed Feb 17 17:57:48 2016] [<ffffffff8108dea0>] ? kthread_park+0x50/0x50 [Wed Feb 17 17:57:48 2016] [<ffffffff8155d74f>] ? ret_from_fork+0x3f/0x70 [Wed Feb 17 17:57:48 2016] [<ffffffff8108dea0>] ? kthread_park+0x50/0x50 ---- cut ---- -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
