KCSAN: data-race in xas_find_marked / xas_set

KCSAN: data-race in xas_find_marked / xas_set_mark
Status: moderation: reported on 2019/12/05 04:45
Reported-by: syzbot+238e9bb046564c2c4d4a@syzkaller.appspotmail.com
First crash: 548d, last: 1d14h

Sample crash report:

FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
msdos filesystem being mounted at /root/syzkaller-testdir515322770/syzkaller.8Wqpv3/1115/file0 supports timestamps until 2107 (0x10391447e)
==================================================================
BUG: KCSAN: data-race in xas_find_marked / xas_set_mark

write to 0xffff8881004556b8 of 8 bytes by task 5479 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_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:95 [inline]
 node_set_mark lib/xarray.c:93 [inline]
 xas_set_mark+0xa1/0x150 lib/xarray.c:882
 tag_pages_for_writeback+0x9d/0x2e0 mm/page-writeback.c:2124
 ext4_writepages+0x683/0x1d10 fs/ext4/inode.c:2740
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range mm/filemap.c:424 [inline]
 filemap_write_and_wait_range+0x20a/0x390 mm/filemap.c:657
 __iomap_dio_rw+0x40a/0xa10 fs/iomap/direct-io.c:525
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xa04/0x11d0 fs/ext4/file.c:661
 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

read to 0xffff8881004556b8 of 8 bytes by task 5467 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
 mpage_prepare_extent_to_map+0x195/0x640 fs/ext4/inode.c:2579
 ext4_writepages+0x6c6/0x1d10 fs/ext4/inode.c:2756
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range mm/filemap.c:424 [inline]
 file_write_and_wait_range+0x180/0x210 mm/filemap.c:763
 ext4_sync_file+0x105/0x670 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2843 [inline]
 ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:502
 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: 5467 Comm: syz-executor.5 Tainted: G        W         5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (765):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/21 20:49	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/21 09:13	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/20 08:13	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/19 22:32	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/19 08:02	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/19 07:50	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/18 23:12	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/17 20:34	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/17 07:06	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/16 18:50	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/16 06:34	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/14 10:50	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/13 22:05	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/13 18:58	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/12 23:51	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/12 09:26	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/11 20:15	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/11 04:34	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/10 16:30	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/10 01:39	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/09 11:44	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/08 21:55	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/08 09:00	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/07 19:10	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/06 21:23	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/05 19:40	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/04 03:37	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/03 14:54	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/02 07:22	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/04/01 18:47	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/31 05:54	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/30 17:12	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/29 21:58	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/29 10:49	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/28 20:39	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/27 00:48	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/26 11:30	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/25 09:05	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/24 19:52	upstream	4ee998b0	607e3baf	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/23 18:35	upstream	7acac4b3	e613994b	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/23 08:19	upstream	84196390	8092f30d	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/22 18:13	upstream	0d02ec6b	8092f30d	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/22 17:03	upstream	0d02ec6b	bea32f74	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/22 03:40	upstream	5ee96fa9	bea32f74	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/21 23:15	upstream	5ee96fa9	4c9a64da	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/03/21 18:25	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in xas_find_marked / xas_set_mark
ci2-upstream-kcsan-gce	2021/01/16 09:14	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 02:27	https://github.com/google/ktsan.git kcsan	05f22368	d0686497	.config	log	report