FYI, we noticed the below changes on

https://github.com/0day-ci/linux Chandan-Rajendra/Btrfs-Pre-subpagesize-blocksize-cleanups/20160121-183121
commit d57227e5d3f93fc76eacf96f982c0505f72ccb64 ("Btrfs: __btrfs_buffered_write: Reserve/release extents aligned to block size")


<12>
[   45.910671] run fstests generic/127 at 2016-01-23 19:56:46
<4>[ 1213.498047] ------------[ cut here ]------------
<4>[ 1213.502837] WARNING: CPU: 7 PID: 2157 at fs/btrfs/inode.c:9115 btrfs_destroy_inode+0x254/0x2c0 [btrfs]()
<4>[ 1213.514423] Modules linked in: dm_mod btrfs xor raid6_pq ses enclosure ipmi_devintf rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod ata_generic cdrom sd_mod pata_acpi mptsas snd_pcm snd_timer mptscsih coretemp kvm_intel pata_jmicron mptbase snd ahci kvm irqbypass libahci crct10dif_pclmul soundcore crc32_pclmul crc32c_intel ppdev aesni_intel serio_raw lrw pcspkr gf128mul scsi_transport_sas glue_helper ablk_helper cryptd libata i7core_edac ipmi_si parport_pc edac_core shpchp parport ipmi_msghandler acpi_cpufreq
<4>[ 1213.562665] CPU: 7 PID: 2157 Comm: umount Not tainted 4.4.0-rc6-00083-gd57227e #1
<4>[ 1213.570434] Hardware name: Supermicro X8DTN/X8DTN, BIOS 4.6.3 01/06/2010
<47>
[ 1213.570885] systemd-journald[291]: Compressed data object 519 -> 436
<4>[ 1213.583787]  ffffffffa077fd18 ffff8804197dfcb0 ffffffff81410e22 0000000000000000
<4>[ 1213.591593]  ffff8804197dfce8 ffffffff81078cc6 ffff88043b7c85c8 ffff88043b7c85c8
<4>[ 1213.599416]  ffff88043c0f5000 ffff8802363714e8 ffff8802363714e8 ffff8804197dfcf8
<4>[ 1213.607235] Call Trace:
<4>[ 1213.609848]  [<ffffffff81410e22>] dump_stack+0x4b/0x69
<4>[ 1213.615149]  [<ffffffff81078cc6>] warn_slowpath_common+0x86/0xc0
<4>[ 1213.621319]  [<ffffffff81078dba>] warn_slowpath_null+0x1a/0x20
<4>[ 1213.627325]  [<ffffffffa070ac04>] btrfs_destroy_inode+0x254/0x2c0 [btrfs]
<4>[ 1213.634280]  [<ffffffff812033a8>] destroy_inode+0x38/0x60
<4>[ 1213.639844]  [<ffffffff812038e2>] evict+0x132/0x190
<4>[ 1213.644883]  [<ffffffff81203977>] dispose_list+0x37/0x60
<4>[ 1213.650354]  [<ffffffff81204f3a>] evict_inodes+0x16a/0x180
<4>[ 1213.656007]  [<ffffffff811eb27f>] generic_shutdown_super+0x3f/0x100
<4>[ 1213.662437]  [<ffffffff811eb352>] kill_anon_super+0x12/0x20
<4>[ 1213.668177]  [<ffffffffa06ca4f8>] btrfs_kill_super+0x18/0x110 [btrfs]
<4>[ 1213.674776]  [<ffffffff811eace3>] deactivate_locked_super+0x43/0x70
<4>[ 1213.681198]  [<ffffffff811ead6c>] deactivate_super+0x5c/0x60
<4>[ 1213.687014]  [<ffffffff8120801f>] cleanup_mnt+0x3f/0x90
<4>[ 1213.692396]  [<ffffffff812080b2>] __cleanup_mnt+0x12/0x20
<4>[ 1213.697961]  [<ffffffff810958f6>] task_work_run+0x76/0xb0
<4>[ 1213.703520]  [<ffffffff81003352>] exit_to_usermode_loop+0xc2/0xd0
<4>[ 1213.709777]  [<ffffffff81003c15>] syscall_return_slowpath+0xf5/0x160
<4>[ 1213.716298]  [<ffffffff818c73cc>] int_ret_from_sys_call+0x25/0x8f
<4>[ 1213.722554] ---[ end trace 136a9d17f8be918f ]---
<4>[ 1213.727443] ------------[ cut here ]------------


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