KCSAN: data-race in xas_clear_mark / xas_find

KCSAN: data-race in xas_clear_mark / xas_find_marked (2)
Status: moderation: reported on 2019/12/10 21:55
Reported-by: syzbot+6b653cb0a28eee8c400a@syzkaller.appspotmail.com
First crash: 548d, last: 7m

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in xas_clear_mark / xas_find_marked				3	553d	559d	0/22	closed as invalid on 2019/10/18 14:11

Sample crash report:

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

write to 0xffff888105e66478 of 8 bytes by task 7422 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_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline]
 node_clear_mark lib/xarray.c:100 [inline]
 xas_clear_mark+0xa1/0x180 lib/xarray.c:911
 __test_set_page_writeback+0x401/0x500 mm/page-writeback.c:2802
 ext4_bio_write_page+0xee/0xa40 fs/ext4/page-io.c:450
 mpage_submit_page fs/ext4/inode.c:2102 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2350 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2489 [inline]
 ext4_writepages+0x1050/0x1d10 fs/ext4/inode.c:2802
 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]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 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+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888105e66478 of 8 bytes by task 7431 on cpu 1:
 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]
 filemap_write_and_wait_range+0x20a/0x390 mm/filemap.c:657
 filemap_write_and_wait include/linux/fs.h:2753 [inline]
 ext4_ioctl_setflags+0x27f/0x770 fs/ext4/ioctl.c:395
 __ext4_ioctl fs/ext4/ioctl.c:863 [inline]
 ext4_ioctl+0x1b8c/0x2c00 fs/ext4/ioctl.c:1332
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 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: 1 PID: 7431 Comm: syz-executor.5 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (900):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/23 12:07	upstream	18a3c5f7	17f0b706	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/22 23:49	upstream	90c911ad	590921a5	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/22 22:39	upstream	90c911ad	33c28d03	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/22 11:47	upstream	16fc44d6	33c28d03	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 20:12	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 18:15	upstream	16fc44d6	95777977	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 08:02	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/21 00:35	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/20 07:34	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 22:38	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 19:22	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/19 07:14	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/18 23:04	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/18 09:49	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/17 20:06	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/17 07:02	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 17:54	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 12:30	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/16 05:49	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/15 16:37	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/14 22:47	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/14 10:32	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/13 21:57	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/13 19:00	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/12 22:49	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/12 09:25	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/11 19:39	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/11 04:10	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/10 14:38	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/10 01:03	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/09 11:36	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/08 08:40	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/05 18:44	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/04 22:32	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/04 02:55	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/03 13:19	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in xas_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 xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/04/01 18:05	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/31 19:19	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/31 05:49	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/30 16:38	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/29 20:18	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/29 10:38	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/28 20:25	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/27 00:40	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/26 11:03	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/25 22:01	upstream	00232240	6a383ecf	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/25 08:43	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/24 19:21	upstream	4ee998b0	607e3baf	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/24 19:17	upstream	4ee998b0	607e3baf	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/24 13:34	upstream	7acac4b3	607e3baf	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/23 18:26	upstream	7acac4b3	e613994b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/23 15:50	upstream	84196390	e613994b	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/23 07:42	upstream	84196390	8092f30d	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/22 18:04	upstream	0d02ec6b	8092f30d	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/22 16:46	upstream	0d02ec6b	bea32f74	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/03/21 22:58	upstream	5ee96fa9	4c9a64da	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/17 10:22	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/22 14:09	https://github.com/google/ktsan.git kcsan	05f22368	4ee855e7	.config	log	report