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: 653d, last: 3h08m

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	658d	664d	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 0xffff888131af3468 of 8 bytes by task 14412 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+0x3e9/0x500 mm/page-writeback.c:2809
 ext4_bio_write_page+0xee/0xa40 fs/ext4/page-io.c:450
 mpage_submit_page fs/ext4/inode.c:2100 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2348 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2487 [inline]
 ext4_writepages+0x1050/0x1d10 fs/ext4/inode.c:2800
 do_writepages+0x7b/0x150 mm/page-writeback.c:2355
 __filemap_fdatawrite_range mm/filemap.c:413 [inline]
 __filemap_fdatawrite mm/filemap.c:421 [inline]
 filemap_flush+0x132/0x160 mm/filemap.c:448
 ext4_alloc_da_blocks+0x47/0xd0 fs/ext4/inode.c:3164
 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888131af3468 of 8 bytes by task 14438 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:1925 [inline]
 find_get_pages_range_tag+0xf2/0x390 mm/filemap.c:2216
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1123
 mpage_prepare_extent_to_map+0x195/0x640 fs/ext4/inode.c:2577
 ext4_writepages+0x6c6/0x1d10 fs/ext4/inode.c:2754
 do_writepages+0x7b/0x150 mm/page-writeback.c:2355
 __filemap_fdatawrite_range mm/filemap.c:413 [inline]
 __filemap_fdatawrite mm/filemap.c:421 [inline]
 filemap_flush+0x132/0x160 mm/filemap.c:448
 ext4_alloc_da_blocks+0x47/0xd0 fs/ext4/inode.c:3164
 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 get_signal+0x156c/0x15e0 kernel/signal.c:2581
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffffffffffff8000 -> 0xffffffffff000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14438 Comm: syz-executor.2 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1142):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 16:01	upstream	251a1524293d	d2d6e680	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/05 03:59	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/05 03:58	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/04 20:45	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/04 16:09	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/03 17:33	upstream	d5ad8ec3cfb5	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/02 09:47	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/08/01 19:56	upstream	d4affd6b6e81	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/31 21:47	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/31 08:19	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/30 18:45	upstream	4669e13cd67f	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/30 17:04	upstream	764a5bc89b12	6c236867	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/30 04:44	upstream	7e96bf476270	c585c7b0	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/29 17:36	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/29 16:11	upstream	4010a528219e	8a799410	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/29 04:55	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/28 18:43	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/28 16:06	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/27 21:52	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/27 15:46	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/26 06:14	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/26 02:40	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/25 00:25	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/24 09:46	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/24 04:01	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/23 14:23	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/23 00:06	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/22 11:15	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/22 09:32	upstream	3d5895cd3517	29c3f20f	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/21 20:13	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/20 12:13	upstream	2734d6c1b1a0	1b201b48	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/19 22:37	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/19 10:19	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/19 08:40	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/19 08:37	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/18 19:26	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/16 23:05	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/16 09:03	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/15 20:05	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/15 15:49	upstream	8096acd7442e	f115ae98	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/15 00:19	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/14 17:29	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/07/14 12:44	upstream	40226a3d96ef	94e0b707	.config	log	report	info	KCSAN: data-race in xas_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/17 10:22	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/22 14:09	https://github.com/google/ktsan.git kcsan	05f2236801fe	4ee855e7	.config	log	report