KCSAN: data-race in vfs_fsync_range / writeback_single

KCSAN: data-race in vfs_fsync_range / writeback_single_inode (2)
Status: moderation: reported on 2020/12/07 11:35
Reported-by: syzbot+38c4a2b15c510e753d2e@syzkaller.appspotmail.com
First crash: 273d, last: 8d07h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in vfs_fsync_range / writeback_single_inode				12	315d	542d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

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

write to 0xffff88802ad9dcc0 of 8 bytes by task 32669 on cpu 0:
 writeback_single_inode+0x105/0x580 fs/fs-writeback.c:1577
 sync_inode fs/fs-writeback.c:2624 [inline]
 sync_inode_metadata+0x52/0x70 fs/fs-writeback.c:2644
 __generic_file_fsync+0xf5/0x140 fs/libfs.c:1089
 fat_file_fsync+0x48/0x100 fs/fat/file.c:190
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2843 [inline]
 generic_file_write_iter+0x103/0x130 mm/filemap.c:3740
 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 0xffff88802ad9dcc0 of 8 bytes by task 32650 on cpu 1:
 vfs_fsync_range+0x98/0x120 fs/sync.c:198
 generic_write_sync include/linux/fs.h:2843 [inline]
 generic_file_write_iter+0x103/0x130 mm/filemap.c:3740
 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: 32650 Comm: syz-executor.0 Tainted: G        W         5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (80):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/13 00:47	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/10 01:21	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/08 18:00	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/31 21:42	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/31 06:26	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/27 04:43	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/25 08:50	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/23 21:52	upstream	7acac4b3	e613994b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/22 17:09	upstream	0d02ec6b	bea32f74	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/20 23:43	upstream	812da4d3	17810eae	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/19 22:48	upstream	8b12a62a	3d01c4de	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/18 22:32	upstream	bf152b0b	380dcc3e	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/16 19:51	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/16 06:11	upstream	1a4431a5	fdb2bb2c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/15 10:59	upstream	1e28eed1	cc1cff8f	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/14 19:47	upstream	88fe4924	cc1cff8f	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/12 14:35	upstream	f78d76e7	429d8a6b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/09 16:59	upstream	144c79ef	26967e35	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/23 07:13	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/21 06:09	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/14 15:08	upstream	358fecee	98682e5e	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/13 01:03	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/12 08:32	upstream	dcc0b490	a5f86b15	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/11 23:23	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/08 23:53	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/06 23:19	upstream	964d069f	0655e081	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/04 15:08	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/02 05:04	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/31 14:56	upstream	6642d600	fc9fd31e	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/30 23:20	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/28 20:47	upstream	e5ff2cb9	7df34f59	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/27 07:48	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/24 20:51	upstream	e6806137	52e37319	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/21 14:48	upstream	9791581c	d4f4eca5	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/20 12:07	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/18 05:17	upstream	19c329f6	fd103621	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/16 23:05	upstream	54c6247d	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/16 08:05	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 00:55	upstream	14662050	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/13 17:05	upstream	e609571b	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 02:36	upstream	a0d54b4f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/11 15:38	upstream	7c53f6b6	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/06 01:17	upstream	6207214a	b1c228e1	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/04 21:10	upstream	36bbbd0e	2a28ff1f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/31 15:48	upstream	f6e1ea19	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/31 05:51	upstream	f6e1ea19	5cc121d6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 05:49	upstream	139711f0	0fa352f2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 09:03	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 09:37	upstream	f838f8d2	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 06:49	upstream	3913d00a	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 03:43	upstream	8653b778	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 03:10	upstream	3644e2d2	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 16:57	upstream	a409ed15	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 09:39	upstream	accefff5	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 23:53	upstream	5e60366d	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 00:16	upstream	d635a69d	f213e07e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 01:04	upstream	ec6f5e0e	8f160dd5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 13:14	upstream	6bff9bb8	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/10 08:54	upstream	ca4bbdaf	c090b4da	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 12:41	upstream	a68a0262	99917735	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 10:59	upstream	7059c2c0	f12ba0c5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/20 00:27	upstream	131ad0b6	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 21:59	upstream	f01c30de	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 11:56	upstream	f8394f23	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/30 13:14	upstream	07e08873	a6e3ac3b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/24 16:11	upstream	f11901ed	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 09:05	upstream	f804b315	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/07 14:36	upstream	c85fb28b	1880b4a9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/05 09:49	upstream	549738f1	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/28 08:57	upstream	a1b8638b	6bfdbe89	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/21 09:14	upstream	ba4f184e	c81d99c8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 13:15	upstream	325d0eab	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/11 21:31	upstream	e8878ab8	adfb8b4e	.config	log	report
ci2-upstream-kcsan-gce	2020/09/09 23:50	upstream	34d4ddd3	ac7ca78e	.config	log	report
ci2-upstream-kcsan-gce	2020/09/09 09:13	upstream	34d4ddd3	0ea7a887	.config	log	report
ci2-upstream-kcsan-gce	2020/08/25 02:01	upstream	6a9dc5fd	344da168	.config	log	report
ci2-upstream-kcsan-gce	2020/08/13 13:44	upstream	fb893de3	ee7cb8b6	.config	log	report
ci2-upstream-kcsan-gce	2020/08/03 23:04	upstream	bcf87687	96dd3623	.config	log	report
ci2-upstream-kcsan-gce	2020/08/02 21:26	upstream	142c3326	96dd3623	.config	log	report
ci2-upstream-kcsan-gce	2020/07/21 19:00	upstream	4fa640dc	e562dd8a	.config	log	report