KCSAN: data-race in __xa_set_mark / xas_find

KCSAN: data-race in __xa_set_mark / xas_find_marked
Status: moderation: reported on 2020/09/25 08:57
Reported-by: syzbot+f512479ce46e8f0a9370@syzkaller.appspotmail.com
First crash: 252d, last: 5d20h

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __xa_set_mark / xas_find_marked

write to 0xffff8881310bf8e8 of 8 bytes by task 10882 on cpu 0:
 instrument_write include/linux/instrumented.h:42 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [inline]
 __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline]
 node_set_mark lib/xarray.c:93 [inline]
 xas_set_mark lib/xarray.c:882 [inline]
 __xa_set_mark+0xef/0x1b0 lib/xarray.c:1898
 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:609
 mark_buffer_dirty+0x126/0x230 fs/buffer.c:1137
 __block_commit_write fs/buffer.c:2084 [inline]
 block_write_end+0x13d/0x230 fs/buffer.c:2162
 generic_write_end+0x5c/0x240 fs/buffer.c:2176
 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3111
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3514
 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:269
 ext4_file_write_iter+0x48a/0x10b0 fs/ext4/file.c:502
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881310bf8e8 of 8 bytes by task 1270 on cpu 1:
 xas_find_chunk include/linux/xarray.h:1660 [inline]
 xas_find_marked+0x22f/0x6b0 lib/xarray.c:1348
 xas_next_marked include/linux/xarray.h:1696 [inline]
 find_get_pages_range_tag+0x406/0x600 mm/filemap.c:2109
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1122
 mpage_prepare_extent_to_map+0x195/0x640 fs/ext4/inode.c:2578
 ext4_writepages+0x97b/0x1e70 fs/ext4/inode.c:2799
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __writeback_single_inode+0x80/0x4d0 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x6a7/0xff0 fs/fs-writeback.c:1732
 __writeback_inodes_wb+0xb0/0x2b0 fs/fs-writeback.c:1801
 wb_writeback+0x290/0x660 fs/fs-writeback.c:1907
 wb_check_start_all fs/fs-writeback.c:2031 [inline]
 wb_do_writeback+0x3f9/0x5d0 fs/fs-writeback.c:2057
 wb_workfn+0xc8/0x430 fs/fs-writeback.c:2091
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1270 Comm: kworker/u4:3 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
==================================================================

Crashes (83):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/23 02:57	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/02/20 11:29	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/02/19 16:11	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/02/05 14:13	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/02/03 21:20	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/02/01 22:52	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/02/01 14:22	upstream	1048ba83	e6b95f32	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/24 00:31	upstream	e1ae4b0b	52e37319	.config	log	report	info	KCSAN: data-race in __xa_set_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/17 11:08	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 22:36	upstream	6207214a	b1c228e1	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 10:25	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/28 22:09	upstream	c76e02c5	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 02:14	upstream	3644e2d2	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 11:51	upstream	a409ed15	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 21:50	upstream	8100a580	c521566d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/27 13:35	upstream	85a2c56c	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/25 20:01	upstream	fa02fcd9	3f581b43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/23 16:21	upstream	418baf2c	878fb17a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/22 22:28	upstream	68d3fa23	0d27f508	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/21 08:06	upstream	27bba9c5	68068804	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/18 21:33	upstream	c2e7554e	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 23:56	upstream	111e91a6	09323409	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/15 19:28	upstream	0062442e	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 04:26	upstream	af5043c8	16fca0c8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 23:48	upstream	3552c370	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/03 23:17	upstream	4ef8451b	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/01 19:19	upstream	31f02006	8bc4594f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/28 22:59	upstream	ed8780e3	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 22:59	upstream	96485e44	4e740c00	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/19 12:03	upstream	7cf726a5	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/10 22:09	upstream	6f2f486d	4a77ae0b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/05 03:23	upstream	549738f1	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/26 12:34	upstream	7c7ec322	2d5ea0cb	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/24 17:40	upstream	171d4ff7	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 05:12	upstream	92ab97ad	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 03:10	upstream	92ab97ad	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 18:38	upstream	10b82d51	38962c8b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/17 18:14	upstream	5925fa68	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 22:40	upstream	5925fa68	77507d02	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 01:58	upstream	fc4f28bb	18d7d030	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/13 22:33	upstream	84b13499	2d3cdd63	.config	log	report
ci2-upstream-kcsan-gce	2020/09/07 01:00	upstream	a8205e31	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 08:53	upstream	15bc20c6	816e0689	.config	log	report
ci2-upstream-kcsan-gce	2020/08/21 19:21	upstream	cd02217a	6436ce4b	.config	log	report
ci2-upstream-kcsan-gce	2020/08/20 18:25	upstream	7eac66d0	70160577	.config	log	report
ci2-upstream-kcsan-gce	2020/08/20 07:30	upstream	7eac66d0	ed282a3a	.config	log	report
ci2-upstream-kcsan-gce	2020/07/08 09:41	upstream	dcde237b	5962a2dc	.config	log	report
ci2-upstream-kcsan-gce	2020/07/06 02:46	upstream	45a5ac7a	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 14:38	upstream	35e884f8	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/07/04 04:39	upstream	0c7d7d1f	51095195	.config	log	report
ci2-upstream-kcsan-gce	2020/07/02 09:36	upstream	cd77006e	f8885dc4	.config	log	report
ci2-upstream-kcsan-gce	2020/07/02 09:29	upstream	cd77006e	f8885dc4	.config	log	report
ci2-upstream-kcsan-gce	2020/07/01 22:08	upstream	edb543cf	bed10395	.config	log	report
ci2-upstream-kcsan-gce	2020/07/01 17:16	upstream	7c30b859	39acb39d	.config	log	report
ci2-upstream-kcsan-gce	2020/07/01 09:11	upstream	7c30b859	c0383ebe	.config	log	report
ci2-upstream-kcsan-gce	2020/06/30 10:58	upstream	7c30b859	917afeaa	.config	log	report
ci2-upstream-kcsan-gce	2020/06/29 06:58	upstream	9ebcfadb	0375051c	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 15:43	upstream	1590a2e1	2defc703	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 10:22	upstream	1590a2e1	032b4239	.config	log	report
ci2-upstream-kcsan-gce	2020/06/26 15:15	upstream	4a21185c	9506ea6d	.config	log	report
ci2-upstream-kcsan-gce	2020/06/25 19:01	upstream	908f7d12	adb7d9e6	.config	log	report
ci2-upstream-kcsan-gce	2020/06/25 11:11	upstream	8be3a53e	c7b4497a	.config	log	report
ci2-upstream-kcsan-gce	2020/06/21 17:45	upstream	64677779	4f2acff9	.config	log	report