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: 448d, last: 16d

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	460d	671d	0/22	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 0xffff888134858380 of 8 bytes by task 15252 on cpu 1:
 __add_to_page_cache_locked+0x266/0x4c0 mm/filemap.c:934
 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:987
 pagecache_get_page+0x6b6/0x920 mm/filemap.c:1954
 grab_cache_page_write_begin+0x3f/0x70 mm/filemap.c:3727
 ext4_da_write_begin+0x2f9/0x7f0 fs/ext4/inode.c:2984
 generic_perform_write+0x1a6/0x3d0 mm/filemap.c:3773
 ext4_buffered_write_iter+0x305/0x400 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x11a0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2158 [inline]
 do_iter_readv_writev+0x2cd/0x370 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 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+0x618/0xb90 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888134858380 of 8 bytes by task 15253 on cpu 0:
 mapping_needs_writeback mm/filemap.c:641 [inline]
 file_write_and_wait_range+0x4b/0x230 mm/filemap.c:811
 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:2950 [inline]
 ext4_buffered_write_iter+0x3af/0x400 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11a0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2158 [inline]
 do_iter_readv_writev+0x2cd/0x370 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 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+0x618/0xb90 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000002ba7 -> 0x0000000000002ba9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15253 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (133):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/09/02 06:11	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/08/05 07:23	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/30 06:52	upstream	764a5bc89b12	c585c7b0	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/29 20:45	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/24 10:50	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/21 20:30	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/19 17:49	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/19 00:20	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/17 20:55	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/16 09:59	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/12 18:22	upstream	e73f0f0ee754	f415556d	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/08 07:08	upstream	3dbdb38e2869	1aade754	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/07/02 17:34	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/06/29 14:23	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/06/29 00:56	upstream	122fa8c58831	9d2ab5df	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/06/26 00:49	upstream	44db63d1ad8d	ae6bf8dd	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/06/15 15:32	upstream	009c9aa5be65	8022d7e3	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/06/09 13:04	upstream	368094df48e6	84fe5d96	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/25 03:25	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/21 22:35	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/20 12:03	upstream	c3d0e3fd41b7	c560a65d	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/18 04:19	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/10 02:42	upstream	9819f682e48c	bc5434be	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/09 14:04	upstream	b741596468b0	bc5434be	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/05/04 14:54	upstream	5e321ded302d	06c27ff5	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/29 10:37	upstream	d72cd4ad4174	77e2b668	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/24 01:38	upstream	8db5efb83fa9	17f0b706	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/22 23:00	upstream	90c911ad7445	33c28d03	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/21 21:02	upstream	16fc44d6387e	2bc8999a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/19 08:14	upstream	bf05bf16c76b	50f523d7	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/17 20:56	upstream	194cf4825638	7e2b734b	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/16 18:56	upstream	2f7b98d1e55c	7e2b734b	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/16 06:16	upstream	7e25f40eab52	c59079a6	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/15 16:39	upstream	7f75285ca572	c59079a6	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/14 12:47	upstream	50987beca096	3134b37f	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/10 16:16	upstream	d4961772226d	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/10 04:12	upstream	4e04e7513b0f	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/09 11:50	upstream	17e7124aad76	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/08 10:49	upstream	454859c552da	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/05 20:57	upstream	0a50438c8436	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/04/02 23:49	upstream	0a84c2e440f7	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/03/31 06:21	upstream	5e46d1b78a03	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/03/30 23:11	upstream	2bb25b3a748a	6a81331a	.config	log	report	info	KCSAN: data-race in __add_to_page_cache_locked / file_write_and_wait_range
ci2-upstream-kcsan-gce	2021/03/25 11:43	upstream	e138138003eb	6a383ecf	.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	1d94330a437a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/06 23:18	upstream	bf3e76289cd2	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/04 03:41	upstream	4ef8451b3326	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/26 17:13	upstream	4a21185cda0f	9506ea6d	.config	log	report