FYI, we noticed the below changes on git://internal_mailing_list_patch_tree Zhao-Lei/btrfs-Fix-lost-data-profile-caused-by-auto-removing-bg commit 84f0ca2788dcdb47dca78a24bf67ad5ef30f761d ("btrfs: Fix lost-data-profile caused by auto removing bg") [ 41.439047] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory [ 41.448633] NFSD: starting 90-second grace period (net ffffffff81ddea00) [ 43.725508] ses 8:0:12:0: Attached Enclosure device [ 71.263805] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:21 [ 71.273869] in_atomic(): 1, irqs_disabled(): 0, pid: 978, name: btrfs-cleaner [ 71.281226] CPU: 3 PID: 978 Comm: btrfs-cleaner Not tainted 4.3.0-rc3-00001-g84f0ca2 #1 [ 71.289551] Hardware name: Supermicro X8DTN/X8DTN, BIOS 4.6.3 01/06/2010 [ 71.296452] 0000000000000015 ffff880229e6bda8 ffffffff81402802 ffffffff81b88850 [ 71.304477] ffff880229e6bdb8 ffffffff81099368 ffff880229e6bde0 ffffffff81099402 [ 71.312499] ffff88043cf8c0a0 ffff88043cf8d400 ffff88043cf8d520 ffff880229e6bdf8 [ 71.320524] Call Trace: [ 71.323194] [] dump_stack+0x4b/0x69 [ 71.328534] [] ___might_sleep+0xe8/0x130 [ 71.337648] [] __might_sleep+0x52/0xb0 [ 71.343249] [] down_read+0x20/0x40 [ 71.348522] [] btrfs_delete_unused_bgs+0xbb/0x440 [btrfs] [ 71.355803] [] cleaner_kthread+0x1ef/0x260 [btrfs] [ 71.362459] [] ? write_all_supers+0xab0/0xab0 [btrfs] [ 71.370190] [] kthread+0xef/0x110 [ 71.375354] [] ? kthread_park+0x60/0x60 [ 71.381043] [] ret_from_fork+0x3f/0x70 [ 71.386633] [] ? kthread_park+0x60/0x60 <6>[ 0.000000] Initializing cgroup subsys cpuset <6>[ 0.000000] Initializing cgroup subsys cpu <5>[ 0.000000] Linux version 4.3.0-rc3-00001-g84f0ca2 (kbuild@lkp-nex05) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP Sat Oct 3 04:21:32 CST 2015 To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Ying Huang