FYI, we noticed the following commit:

https://github.com/0day-ci/linux Nicholas-Piggin/optimise-unlock_page-end_page_writeback/20161102-150709
commit 6ab7850933aa7c4859c30045626a86d9cdb5ac61 ("mm: Use owner_priv bit for PageSwapCache, valid when PageSwapBacked")

in testcase: fsmark
with following parameters:

	iterations: 1x
	nr_threads: 1t
	disk: 8BRD_12G
	md: RAID6
	fs: btrfs
	filesize: 4M
	test_size: 60G
	sync_method: fsyncBeforeClose
	cpufreq_governor: performance


The fsmark is a file system benchmark to test synchronous write workloads, for example, mail servers workload.


on test machine: 144 threads Intel(R) Xeon(R) CPU E7-8890 v3 @ 2.50GHz with 128G memory

caused below changes:


+------------------------------------------------------------------+------------+------------+
|                                                                  | 0c183d92b2 | 6ab7850933 |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 1          | 0          |
| boot_failures                                                    | 1          | 1          |
| invoked_oom-killer:gfp_mask=0x                                   | 1          |            |
| Mem-Info                                                         | 1          |            |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 1          |            |
| BUG:kernel_reboot-without-warning_in_test_stage                  | 0          | 1          |
+------------------------------------------------------------------+------------+------------+



user  :notice: [   56.147733] 2016-11-07 14:36:14 fs_mark -d /fs/md0/1 -n 15360 -L 1 -S 1 -s 4194304


kern  :crit  : [   56.160360] BTRFS critical (device md0): corrupt leaf, non-root leaf's nritems is 0: block=29540352, root=1, slot=0
user  :notice: [   56.161213] #  fs_mark  -d  /fs/md0/1  -n  15360  -L  1  -S  1  -s  4194304 

user  :notice: [   56.162106] #	Version 3.3, 1 thread(s) starting at Mon Nov  7 14:36:14 2016


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,
Kernel Test Robot