KCSAN: data-race in __xa_clear_mark / xas_find

KCSAN: data-race in __xa_clear_mark / xas_find_marked
Status: upstream: reported on 2020/08/10 12:41
Reported-by: syzbot+0d4522639ba75b02bf19@syzkaller.appspotmail.com
First crash: 302d, last: 3h14m

Sample crash report:

loop4: detected capacity change from 0 to 264192
FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
==================================================================
BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked

write to 0xffff888105f6bfb0 of 8 bytes by interrupt on cpu 1:
 instrument_write include/linux/instrumented.h:42 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:79 [inline]
 __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark lib/xarray.c:911 [inline]
 __xa_clear_mark+0x1d9/0x2c0 lib/xarray.c:1917
 test_clear_page_writeback+0x2f1/0x640 mm/page-writeback.c:2739
 end_page_writeback+0xd7/0x1b0 mm/filemap.c:1460
 page_endio+0x1cc/0x280 mm/filemap.c:1492
 mpage_end_io+0x186/0x1d0 fs/mpage.c:54
 bio_endio+0x21d/0x300 block/bio.c:1451
 req_bio_endio block/blk-core.c:265 [inline]
 blk_update_request+0x435/0xa30 block/blk-core.c:1456
 blk_mq_end_request+0x22/0x50 block/blk-mq.c:564
 lo_complete_rq+0xca/0x180 drivers/block/loop.c:497
 blk_complete_reqs block/blk-mq.c:576 [inline]
 blk_done_softirq+0x69/0x90 block/blk-mq.c:581
 __do_softirq+0x12c/0x275 kernel/softirq.c:345
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:652
 smpboot_thread_fn+0x2a1/0x3f0 kernel/smpboot.c:165
 kthread+0x1d0/0x1f0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888105f6bfb0 of 8 bytes by task 8960 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1662 [inline]
 xas_find_marked+0x195/0x5f0 lib/xarray.c:1349
 find_get_entry mm/filemap.c:1837 [inline]
 find_get_pages_range_tag+0xf2/0x390 mm/filemap.c:2122
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1074
 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:521
 filemap_fdatawait_range mm/filemap.c:556 [inline]
 filemap_write_and_wait_range+0x264/0x390 mm/filemap.c:666
 __generic_file_write_iter+0x231/0x300 mm/filemap.c:3690
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3736
 call_write_iter include/linux/fs.h:1977 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8960 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (422):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/21 20:00	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 18:04	upstream	16fc44d6	95777977	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 07:58	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 00:08	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/20 07:21	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 22:25	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 19:18	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 07:19	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/18 22:53	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/18 09:20	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/17 20:14	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/17 06:55	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 17:48	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 12:20	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 05:40	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/15 16:28	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/14 22:37	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/14 10:08	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/13 21:41	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/13 18:51	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/12 22:36	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/12 09:23	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/11 19:21	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/11 03:58	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/10 14:25	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/10 00:41	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/09 11:09	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/08 21:52	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/08 08:32	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/07 19:08	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/06 20:47	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/05 18:26	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/04 22:08	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/04 02:51	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/03 13:06	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/02 23:19	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/02 07:18	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/01 18:06	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/31 19:10	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/31 05:52	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/30 16:26	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/29 20:08	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/29 10:28	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/17 10:02	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/10 10:40	upstream	fc80c51f	7adc7b65	.config	log	report
ci2-upstream-kcsan-gce	2020/07/07 22:01	upstream	aa27b32b	08fc4ef1	.config	log	report
ci2-upstream-kcsan-gce	2020/06/23 17:16	upstream	3e08a952	6930bbef	.config	log	report