KCSAN: data-race in __xa_clear_mark / xas_find

KCSAN: data-race in __xa_clear_mark / xas_find_marked
Status: closed as invalid on 2021/06/07 13:50
Reported-by: syzbot+0d4522639ba75b02bf19@syzkaller.appspotmail.com
First crash: 488d, last: 140d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __xa_clear_mark / xas_find_marked (2)				469	17h01m	120d	0/22	moderation: reported on 2021/06/26 18:58

Sample crash report:

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

write to 0xffff888106647fb0 of 8 bytes by task 1775 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+0x23e/0x560 mm/page-writeback.c:2736
 end_page_writeback+0xd7/0x1b0 mm/filemap.c:1548
 ext4_finish_bio+0x3e2/0x430 fs/ext4/page-io.c:143
 ext4_release_io_end+0x98/0x200 fs/ext4/page-io.c:158
 ext4_end_io_end fs/ext4/page-io.c:192 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:257 [inline]
 ext4_end_io_rsv_work+0x306/0x360 fs/ext4/page-io.c:271
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888106647fb0 of 8 bytes by task 7854 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:1925 [inline]
 find_get_pages_range_tag+0xf2/0x390 mm/filemap.c:2216
 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1123
 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:510
 file_write_and_wait_range+0x1c3/0x210 mm/filemap.c:796
 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:2982 [inline]
 ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2114 [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+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xfffffffc00000000 -> 0xffe0000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7854 Comm: syz-executor.2 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (558):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/07 06:49	upstream	614124bea77e	e59537be	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/06 20:36	upstream	decad3e1d1ed	500c2339	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/05 23:47	upstream	f5b6eb1e0182	500c2339	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/05 10:38	upstream	9d32fa5d74b1	500c2339	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/04 21:29	upstream	16f0596fc1d7	500c2339	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/04 17:50	upstream	16f0596fc1d7	966a236b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/04 09:22	upstream	f88cd3fb9df2	966a236b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/03 19:35	upstream	f88cd3fb9df2	0740de69	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/02 20:26	upstream	324c92e5e0ee	0740de69	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/02 07:22	upstream	231bc5390667	0740de69	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/06/02 04:17	upstream	231bc5390667	032639db	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/31 17:07	upstream	c2131f7e73c9	032639db	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/31 09:04	upstream	8124c8a6b353	032639db	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/31 09:03	upstream	8124c8a6b353	032639db	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/30 23:46	upstream	8124c8a6b353	325a8dab	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/30 06:36	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/29 17:20	upstream	f956cb99b938	325a8dab	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/29 15:54	upstream	6799d4f2da49	325a8dab	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/29 08:32	upstream	6799d4f2da49	858ea628	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/28 19:16	upstream	5ff2756afde0	858ea628	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/28 01:25	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/27 12:15	upstream	d7c5303fbc8a	858ea628	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/26 22:37	upstream	7ac3a1c1ae51	858ea628	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/26 10:02	upstream	ad9f25d33860	750ce164	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/26 05:43	upstream	ad9f25d33860	93d3a9f6	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/25 16:24	upstream	a050a6d2b7e8	93d3a9f6	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/25 02:44	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/25 02:44	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/24 12:56	upstream	c4681547bcce	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/23 23:15	upstream	6ebb6814a1ef	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/23 07:58	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/22 18:33	upstream	23d729263037	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/22 03:24	upstream	45af60e7ced0	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/21 14:10	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/21 01:08	upstream	ba816d3c265c	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/20 23:51	upstream	f01da525b3de	3c7fef33	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/20 17:21	upstream	f01da525b3de	c560a65d	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/20 11:53	upstream	c3d0e3fd41b7	c560a65d	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/19 17:03	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/17 21:18	upstream	d07f6ca923ea	a343ba6b	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/17 08:53	upstream	d07f6ca923ea	a2eb125d	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/17 04:17	upstream	d07f6ca923ea	f54a5c09	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/16 15:02	upstream	63d1cb53e26a	f54a5c09	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/16 01:14	upstream	c12a29ed9094	f54a5c09	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/15 09:47	upstream	25a1298726e9	93f844de	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/15 07:30	upstream	25a1298726e9	8bdd5343	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/05/14 18:21	upstream	bd3c9cdb21a2	8bdd5343	.config	log	report	info	KCSAN: data-race in __xa_clear_mark / xas_find_marked
ci2-upstream-kcsan-gce	2021/01/17 10:02	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/10 10:40	upstream	fc80c51fd4b2	7adc7b65	.config	log	report
ci2-upstream-kcsan-gce	2020/07/07 22:01	upstream	aa27b32b76d0	08fc4ef1	.config	log	report
ci2-upstream-kcsan-gce	2020/06/23 17:16	upstream	3e08a95294a4	6930bbef	.config	log	report