KCSAN: data-race in ext4_sync_file / writeback_single

KCSAN: data-race in ext4_sync_file / writeback_single_inode (2)
Status: moderation: reported on 2020/09/24 09:26
Reported-by: syzbot+7e1bab882548e4db2a89@syzkaller.appspotmail.com
First crash: 480d, last: 4d06h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_sync_file / writeback_single_inode				31	488d	674d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ext4_sync_file / writeback_single_inode

write to 0xffff8881063543f0 of 8 bytes by task 7289 on cpu 1:
 writeback_single_inode+0x148/0x3e0 fs/fs-writeback.c:1726
 sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2748
 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline]
 ext4_sync_file+0x359/0x670 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2955 [inline]
 ext4_buffered_write_iter+0x3af/0x400 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11f0
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2de/0x380 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+0x43a/0x790 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+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1308 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0xb9/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881063543f0 of 8 bytes by task 7295 on cpu 0:
 ext4_fsync_nojournal fs/ext4/fsync.c:87 [inline]
 ext4_sync_file+0x294/0x670 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2955 [inline]
 ext4_buffered_write_iter+0x3af/0x400 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11f0
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2de/0x380 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+0x43a/0x790 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+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1308 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0xb9/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000007 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7295 Comm: syz-executor.1 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (258):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/10/14 17:13	upstream	26d657410983	5462d470	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/08 20:59	upstream	741668ef7832	efe0f24d	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/06 15:26	upstream	60a9483534ed	0a63fd36	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/05 12:29	upstream	f6274b06e326	8a6b1a8d	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/04 19:22	upstream	9e1ff307c779	ce697b49	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/03 08:08	upstream	7b66f4393ad4	db0f5787	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/01 19:15	upstream	24f67d82c43c	cc80db95	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/29 03:50	upstream	d33bec7b3dfa	d82cb927	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/25 15:27	upstream	7d42e9818258	8cac236e	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/19 13:13	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/17 11:14	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/12 13:35	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/09 13:30	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/09 01:35	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/08 09:21	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/04 12:19	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/01 23:39	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/30 10:51	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/30 06:28	upstream	537b57bd5a20	be2c130d	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/26 18:24	upstream	73f3af7b4611	b318694d	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/24 18:44	upstream	6e764bcd1cf7	b599f2fc	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/18 19:48	upstream	d6d09a694205	a2fe1cb5	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/13 19:34	upstream	f8e6dfc64f61	2489ab88	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/11 13:51	upstream	761c6d7ec820	6972b106	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/09 05:16	upstream	66745863ecde	6972b106	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/07 03:29	upstream	894d6f401b21	6972b106	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/05 04:35	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/28 20:12	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/26 03:10	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/22 14:02	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/21 20:52	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/09 21:05	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/08 14:58	upstream	3dbdb38e2869	1aade754	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/05 18:33	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/27 13:31	upstream	625acffd7ae2	9d2ab5df	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/16 11:55	upstream	94f0b2d4a1d0	c06f97ad	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/15 14:10	upstream	009c9aa5be65	8022d7e3	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/11 16:06	upstream	06af8679449d	1ba81399	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/03 05:31	upstream	324c92e5e0ee	0740de69	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/31 18:33	upstream	c2131f7e73c9	032639db	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/26 00:11	upstream	a050a6d2b7e8	93d3a9f6	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/23 21:40	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/21 14:55	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/19 02:01	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/16 09:25	upstream	c12a29ed9094	f54a5c09	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/15 00:16	upstream	bd3c9cdb21a2	8bdd5343	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/11 21:57	upstream	88b06399c9c7	b3c3bb8e	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/11 15:46	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/10 10:02	upstream	6efb943b8616	bc5434be	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/16 09:26	upstream	1d94330a437a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/22 11:25	upstream	98477740630f	3e8f6c27	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/25 07:05	upstream	26e122e97a3d	9d60b18e	.config	log	report