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: 367d, last: 7h12m

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	409d	636d	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 0xffff888139c8aa48 of 8 bytes by task 24760 on cpu 0:
 writeback_single_inode+0x148/0x3c0 fs/fs-writeback.c:1720
 sync_inode fs/fs-writeback.c:2742 [inline]
 sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2762
 __generic_file_fsync+0xf5/0x140 fs/libfs.c:1099
 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:2987 [inline]
 generic_file_write_iter+0x103/0x130 mm/filemap.c:3819
 call_write_iter include/linux/fs.h:2114 [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+0x773/0xda0 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_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 0xffff888139c8aa48 of 8 bytes by task 24771 on cpu 1:
 vfs_fsync_range+0x98/0x120 fs/sync.c:198
 generic_write_sync include/linux/fs.h:2987 [inline]
 generic_file_write_iter+0x103/0x130 mm/filemap.c:3819
 call_write_iter include/linux/fs.h:2114 [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+0x773/0xda0 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_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: 0x0000000000000007 -> 0x0000000000000084

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24771 Comm: syz-executor.2 Tainted: G        W         5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (102):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
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	2021/05/17 21:33	upstream	d07f6ca923ea	a343ba6b	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/13 14:26	upstream	c06a2ba62fc4	ecb594cb	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/11 11:38	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/09 04:11	upstream	b741596468b0	bc5434be	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/07 08:43	upstream	e48661230cc3	f6da8120	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/03 13:07	upstream	9ccce092fc64	77e2b668	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/03 03:39	upstream	17ae69aba89d	77e2b668	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/29 11:04	upstream	d72cd4ad4174	77e2b668	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/23 12:49	upstream	18a3c5f7abfd	17f0b706	.config	log	report	info	KCSAN: data-race in vfs_fsync_range / writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/13 00:47	upstream	89698becf06d	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	4e04e7513b0f	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	454859c552da	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	d19cc4bfbff1	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	5e46d1b78a03	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	0f4498cef9f5	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	e138138003eb	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	7acac4b3196c	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	0d02ec6b3136	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	812da4d39463	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	8b12a62a4e3e	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	bf152b0b41dc	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	1df27313f50a	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	1a4431a5db2b	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	1e28eed17697	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	88fe49249c99	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	f78d76e72a46	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	144c79ef3353	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	b12b47249688	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	e767b3530acb	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	358feceebbf6	98682e5e	.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