KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait

KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range (2)
Status: moderation: reported on 2020/11/08 03:54
Reported-by: syzbot+07c64eb90f8d46abb4c1@syzkaller.appspotmail.com
First crash: 254d, last: 3d12h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range				18	265d	477d	0/21	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range

write to 0xffff88810e1fb498 of 8 bytes by task 11048 on cpu 0:
 __add_to_page_cache_locked+0x3ad/0x6e0 mm/filemap.c:887
 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:940
 pagecache_get_page+0x6a0/0xa30 mm/filemap.c:1808
 grab_cache_page_write_begin+0x3f/0x70 mm/filemap.c:3525
 ext4_da_write_begin+0x34d/0xaf0 fs/ext4/inode.c:2986
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3575
 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:269
 ext4_file_write_iter+0x48a/0x10b0 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+0x7a6/0xe20 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810e1fb498 of 8 bytes by task 11051 on cpu 1:
 mapping_needs_writeback mm/filemap.c:632 [inline]
 file_write_and_wait_range+0x79/0x120 mm/filemap.c:762
 ext4_sync_file+0x105/0x6e0 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+0x38f/0x3e0 fs/ext4/file.c:277
 ext4_file_write_iter+0x48a/0x10b0 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+0x7a6/0xe20 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11051 Comm: syz-executor.5 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (81):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/03/04 09:42	upstream	f69d02e3	d7e4e604	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/23 04:01	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/22 18:20	upstream	31caf8b2	c26fb06b	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/20 10:13	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/17 23:16	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/15 03:03	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/07 09:05	upstream	825b5991	2ce644fc	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/03 20:44	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/02/02 23:51	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/01/30 23:39	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/01/24 00:28	upstream	e1ae4b0b	52e37319	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/01/17 18:20	upstream	0da0a8a0	fd103621	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/01/16 07:20	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/07 00:07	upstream	71c061d2	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 02:30	upstream	58cf05f5	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 01:01	upstream	614cb589	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/20 20:17	upstream	6a447b0e	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 10:05	upstream	accefff5	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 22:28	upstream	5e60366d	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 19:08	upstream	2c85ebc5	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/10 12:06	upstream	a2f5ea9e	2a55c22b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 00:06	upstream	7d8761ba	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/03 01:20	upstream	3bb61aa6	8c9190ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/02 12:00	upstream	509a1542	eff43e99	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/25 16:40	upstream	127c501a	3f581b43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/25 05:25	upstream	127c501a	1a1f4bd8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/21 06:51	upstream	27bba9c5	68068804	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 01:39	upstream	9c87c9f4	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 14:29	upstream	f01c30de	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/06 23:18	upstream	bf3e7628	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/04 03:41	upstream	4ef8451b	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/03 13:04	upstream	b7cbaf59	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 04:47	upstream	f804b315	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/18 20:33	upstream	9453b2d4	fea47c01	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/17 12:51	upstream	071a0578	fea47c01	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/15 01:28	upstream	3e4fb434	fc7735a2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/14 14:27	upstream	b5fc7a89	fc7735a2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/13 23:46	upstream	6ad4bf6e	fc7735a2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/04 09:54	upstream	22fbc037	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/27 15:36	upstream	a1bffa48	5dd8aee8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/26 11:23	upstream	7c7ec322	2d5ea0cb	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/26 04:10	upstream	7c7ec322	4a006f63	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/25 14:38	upstream	171d4ff7	4a006f63	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/23 22:57	upstream	c9c9e6a4	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 07:55	upstream	325d0eab	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/04 22:52	upstream	c0842fbc	02034dac	.config	log	report
ci2-upstream-kcsan-gce	2020/07/29 13:38	upstream	6ba1b005	19a8de55	.config	log	report
ci2-upstream-kcsan-gce	2020/07/26 19:27	upstream	1ada9010	51265195	.config	log	report
ci2-upstream-kcsan-gce	2020/07/19 21:52	upstream	92188b41	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/18 12:49	upstream	6a70f89c	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/16 03:50	upstream	994e99a9	ada108d0	.config	log	report
ci2-upstream-kcsan-gce	2020/07/13 09:46	upstream	11ba4688	f90ec899	.config	log	report
ci2-upstream-kcsan-gce	2020/07/09 08:07	upstream	0bddd227	bc238812	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 18:16	upstream	45a5ac7a	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/07/04 01:41	upstream	0c7d7d1f	51095195	.config	log	report
ci2-upstream-kcsan-gce	2020/07/03 01:28	upstream	7cc2a8ea	f30c14bf	.config	log	report
ci2-upstream-kcsan-gce	2020/07/02 03:08	upstream	edb543cf	bed10395	.config	log	report
ci2-upstream-kcsan-gce	2020/07/01 17:10	upstream	7c30b859	39acb39d	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 08:39	upstream	1590a2e1	ffec44b5	.config	log	report
ci2-upstream-kcsan-gce	2020/06/26 17:13	upstream	4a21185c	9506ea6d	.config	log	report