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: 504d, last: 2d18h

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	547d	773d	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 0xffff888138c30de0 of 8 bytes by task 14842 on cpu 1:
 writeback_single_inode+0x103/0x3d0 fs/fs-writeback.c:1726
 sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2749
 __generic_file_fsync+0xf5/0x140 fs/libfs.c:1126
 fat_file_fsync+0x48/0x100 fs/fat/file.c:190
 vfs_fsync_range+0x107/0x120 fs/sync.c:182
 generic_write_sync include/linux/fs.h:2955 [inline]
 generic_file_write_iter+0x103/0x130 mm/filemap.c:3919
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 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+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888138c30de0 of 8 bytes by task 14849 on cpu 0:
 vfs_fsync_range+0x98/0x120 fs/sync.c:180
 generic_write_sync include/linux/fs.h:2955 [inline]
 generic_file_write_iter+0x103/0x130 mm/filemap.c:3919
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 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+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000007 -> 0x0000000000000084

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14849 Comm: syz-executor.0 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (131):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/12/05 20:30	upstream	944207047ca4	a617004c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/12/04 04:37	upstream	12119cfa1052	a617004c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/11/28 08:37	upstream	3498e7f2bb41	63eeac02	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/11/25 21:15	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/11/13 12:58	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/10 02:29	upstream	7fd2bf83d59a	838e7e2c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/09 10:25	upstream	5d6ab0bb408f	efe0f24d	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/03 07:59	upstream	7b66f4393ad4	db0f5787	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/10/02 17:29	upstream	53d5fc89d66a	db0f5787	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/27 23:56	upstream	0513e464f900	78494d16	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/22 22:32	upstream	cf1d2c3e7e2f	8cac236e	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/21 12:25	upstream	d9fb678414c0	af796c18	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/17 17:01	upstream	ddf21bd8ab98	70b76c1d	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/15 19:33	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/14 10:50	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/13 23:21	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/12 00:17	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/09 12:26	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/07 20:50	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/09/02 08:34	upstream	4ac6d90867a4	7eb7e152	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/28 11:21	upstream	64b4fc45bea6	d5a29e53	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/27 15:06	upstream	77dd11439b86	b318694d	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/26 18:40	upstream	73f3af7b4611	b318694d	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/23 10:31	upstream	e22ce8eb631b	b599f2fc	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/19 21:48	upstream	f87d64319e6f	e2da378b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/18 13:40	upstream	614cb2751d31	a2fe1cb5	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/08/12 00:56	upstream	761c6d7ec820	6972b106	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/27 16:27	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/25 13:39	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/24 04:26	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/16 10:04	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/09 20:54	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/30 22:09	upstream	df04fbe8680b	38a885d1	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/29 14:34	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/26 17:00	upstream	b7050b242430	9d2ab5df	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/19 09:59	upstream	9ed13a17e38e	aba2b2fb	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/14 19:31	upstream	009c9aa5be65	1ba81399	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/13 16:14	upstream	8ecfa36cd4db	1ba81399	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/30 17:18	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/20 20:23	upstream	f01da525b3de	c560a65d	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/19 17:22	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/18 21:34	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/16 23:05	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 10:59	upstream	7059c2c00a21	f12ba0c5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/21 19:00	upstream	4fa640dc5230	e562dd8a	.config	log	report