KCSAN: data-race in __xa_clear_mark / find_get_pages_range

KCSAN: data-race in __xa_clear_mark / find_get_pages_range_tag
Status: moderation: reported on 2020/07/01 11:02
Reported-by: syzbot+ef472c87cd23676ef6fe@syzkaller.appspotmail.com
First crash: 49d, last: 17h35m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __xa_clear_mark / find_get_pages_range_tag

write to 0xffff8880bb5d78f0 of 8 bytes by task 25 on cpu 1:
 instrument_write include/linux/instrumented.h:42 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark lib/xarray.c:908 [inline]
 __xa_clear_mark+0x229/0x350 lib/xarray.c:1726
 test_clear_page_writeback+0x28d/0x480 mm/page-writeback.c:2741
 end_page_writeback+0xa7/0x110 mm/filemap.c:1368
 ext4_finish_bio+0x429/0x490 fs/ext4/page-io.c:146
 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:161
 ext4_end_io_end fs/ext4/page-io.c:195 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline]
 ext4_end_io_rsv_work+0x306/0x360 fs/ext4/page-io.c:274
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff8880bb5d78f0 of 8 bytes by task 10787 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1625 [inline]
 xas_next_marked include/linux/xarray.h:1656 [inline]
 find_get_pages_range_tag+0x30c/0x580 mm/filemap.c:1967
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1120
 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:518
 file_write_and_wait_range+0xea/0x120 mm/filemap.c:764
 ext4_sync_file+0xfc/0x6e0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2730 [inline]
 ext4_buffered_write_iter+0x369/0x3b0 fs/ext4/file.c:277
 ext4_file_write_iter+0x771/0x1010 include/linux/fs.h:774
 call_write_iter include/linux/fs.h:1868 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x608/0x690 fs/read_write.c:578
 ksys_write+0xce/0x180 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:640
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10787 Comm: syz-executor.1 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (218):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-upstream-kcsan-gce	2020/08/06 11:25	upstream	47ec5303	4ca1c0ea	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/05 21:49	upstream	fffe3ae0	0487ea6f	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/05 09:42	upstream	c0842fbc	b7129355	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/04 21:35	upstream	c0842fbc	02034dac	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/04 00:08	upstream	e4cbce4d	96dd3623	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/03 10:37	upstream	bcf87687	96dd3623	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/02 21:10	upstream	142c3326	96dd3623	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/02 07:15	upstream	ac3a0c84	96dd3623	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/08/01 17:54	upstream	d52daa86	8df85ed9	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/31 11:30	upstream	d8b9faec	8df85ed9	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/30 22:12	upstream	e2c46b57	8df85ed9	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/30 08:17	upstream	83bdc727	233283a1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/29 18:51	upstream	6ba1b005	233283a1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/29 06:29	upstream	6ba1b005	19a8de55	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/27 06:16	upstream	92ed3019	cb93dc6a	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/26 08:41	upstream	04300d66	51265195	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/26 00:49	upstream	04300d66	1f7cc1ca	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/25 11:23	upstream	23ee3e4e	1f7cc1ca	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/24 22:12	upstream	68845a55	554af388	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/24 10:42	upstream	f37e99ac	554af388	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/23 21:29	upstream	f37e99ac	70c104a1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/23 15:30	upstream	d15be546	70c104a1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/23 02:15	upstream	d15be546	340ea530	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/22 18:49	upstream	8c26c87b	128cd85f	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/22 13:54	upstream	4fa640dc	128cd85f	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/22 01:56	upstream	4fa640dc	21f1765e	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/21 13:46	upstream	4fa640dc	e562dd8a	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/20 09:30	upstream	5714ee50	8caeeeb7	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/19 21:39	upstream	92188b41	9c812472	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/19 08:19	upstream	f932d58a	9c812472	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/18 18:57	upstream	6cf7ccba	9c812472	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/18 04:21	upstream	6a70f89c	9c812472	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/17 00:15	upstream	07a56bb8	54b3c45e	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/16 11:22	upstream	f8456690	b090c643	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/15 23:57	upstream	994e99a9	ada108d0	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/14 22:53	upstream	e9919e11	ada108d0	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/14 20:16	upstream	e9919e11	6f458026	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/14 10:47	upstream	0dc589da	6f458026	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/14 02:04	upstream	0dc589da	ce4c95b3	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/13 20:09	upstream	11ba4688	ce4c95b3	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/13 08:12	upstream	11ba4688	f90ec899	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/12 18:43	upstream	9901a6bd	9ebcc5b1	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/12 18:17	upstream	9901a6bd	115e1930	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/11 10:40	upstream	1df0d896	7ba05d2d	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/10 21:22	upstream	a581387e	18d18b59	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/10 09:16	upstream	42f82040	56d01184	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/07/01 10:44	upstream	7c30b859	090d8f7b	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/27 10:51	upstream	1590a2e1	032b4239	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/06/18 14:11	upstream	1b504402	3ea11d3f	.config	log	report	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org