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: 248d, last: 13d

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	256d	442d	0/21	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 0xffff88810e998778 of 8 bytes by task 24356 on cpu 0:
 writeback_single_inode+0x105/0x580 fs/fs-writeback.c:1569
 sync_inode fs/fs-writeback.c:2604 [inline]
 sync_inode_metadata+0x52/0x70 fs/fs-writeback.c:2624
 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline]
 ext4_sync_file+0x359/0x6e0 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2737 [inline]
 ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:278
 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [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+0x41a/0x770 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:933
 splice_direct_to_actor+0x345/0x650 fs/splice.c:888
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810e998778 of 8 bytes by task 24344 on cpu 1:
 ext4_fsync_nojournal fs/ext4/fsync.c:87 [inline]
 ext4_sync_file+0x294/0x6e0 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2737 [inline]
 ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:278
 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [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+0x41a/0x770 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:933
 splice_direct_to_actor+0x345/0x650 fs/splice.c:888
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24344 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (149):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/15 12:02	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/11 21:44	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/04 20:25	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/03 23:07	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/01 20:04	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/01 16:41	upstream	1048ba83	e6b95f32	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/01 02:13	upstream	1048ba83	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/31 12:25	upstream	6642d600	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/29 22:52	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/29 11:40	upstream	bec4c296	6593fd32	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/28 23:14	upstream	e5ff2cb9	7df34f59	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/28 12:10	upstream	76c057c8	eefc07f2	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/27 17:07	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/26 14:44	upstream	13391c60	52e37319	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/25 22:50	upstream	f8ad8187	52e37319	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/25 12:37	upstream	6ee1d745	52e37319	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/23 11:28	upstream	fe75a218	52e37319	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/22 22:37	upstream	83d09ad4	52e37319	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/20 23:55	upstream	75439bc4	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/20 19:18	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/20 07:06	upstream	45dfb8a5	63631df1	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/19 00:34	upstream	1e2a199f	63631df1	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/18 16:51	upstream	19c329f6	63631df1	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/18 08:27	upstream	19c329f6	fd103621	.config	log	report	info	KCSAN: data-race in ext4_sync_file / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/16 09:26	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 03:44	upstream	14662050	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/14 16:44	upstream	65f0d241	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/14 02:05	upstream	65f0d241	269d24e8	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/13 12:14	upstream	e609571b	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 01:50	upstream	a0d54b4f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/11 18:17	upstream	7c53f6b6	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/10 21:37	upstream	0653161f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/10 01:33	upstream	2ff90100	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/08 21:41	upstream	6279d812	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/06 14:26	upstream	9f1abbe9	fff20c29	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/06 00:36	upstream	6207214a	b1c228e1	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 21:41	upstream	6207214a	a0234d98	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 10:08	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/04 19:42	upstream	36bbbd0e	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/04 14:53	upstream	e71ba945	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 23:26	upstream	f6e1ea19	ecb8c012	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/28 08:40	upstream	5c8fe583	2242f77f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 03:13	upstream	f838f8d2	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/26 13:41	upstream	40f78232	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 18:28	upstream	71c5f031	b982b3ea	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 16:53	upstream	58cf05f5	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 06:18	upstream	614cb589	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 00:28	upstream	8653b778	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 21:52	upstream	e37b12e4	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/20 03:07	upstream	467f8165	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 05:49	upstream	3644e2d2	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/22 11:25	upstream	98477740	3e8f6c27	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/25 07:05	upstream	26e122e9	9d60b18e	.config	log	report