KCSAN: data-race in __writeback_single_inode / ext4_sync

KCSAN: data-race in __writeback_single_inode / ext4_sync_file (3)
Status: auto-closed as invalid on 2021/07/09 15:43
Reported-by: syzbot+3b0715a7922d0277a91e@syzkaller.appspotmail.com
First crash: 395d, last: 53d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __writeback_single_inode / ext4_sync_file				15	520d	590d	0/22	auto-closed as invalid on 2020/05/03 19:14
upstream	KCSAN: data-race in __writeback_single_inode / ext4_sync_file (2)				3	417d	437d	0/22	closed as invalid on 2020/06/18 14:13

Sample crash report:

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

write to 0xffff8881067ee7c8 of 8 bytes by task 4333 on cpu 1:
 __writeback_single_inode+0x1e9/0x450 fs/fs-writeback.c:1503
 writeback_single_inode+0x177/0x590 fs/fs-writeback.c:1580
 sync_inode fs/fs-writeback.c:2624 [inline]
 sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2644
 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:2982 [inline]
 ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519
 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:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881067ee7c8 of 8 bytes by task 4347 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:2982 [inline]
 ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519
 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:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000087 -> 0x0000000000000080

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4347 Comm: syz-executor.5 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (72):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/04 15:42	upstream	f88cd3fb9df2	966a236b	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/05/13 11:04	upstream	c06a2ba62fc4	ed7d41c5	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/05/04 14:22	upstream	5e321ded302d	06c27ff5	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/04/19 20:25	upstream	bf05bf16c76b	4285c989	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/04/02 07:58	upstream	1678e493d530	6a81331a	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/03/21 22:54	upstream	5ee96fa9dd78	4c9a64da	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/03/19 11:45	upstream	8b12a62a4e3e	2af9d324	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/03/15 08:41	upstream	75013c6c52d8	cc1cff8f	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/02/14 00:18	upstream	ac30d8ce28d6	98682e5e	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/02/01 15:42	upstream	1048ba83fb1c	e6b95f32	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/30 09:47	upstream	0e9bcda5d286	fc9fd31e	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/29 10:46	upstream	bec4c2968fce	6593fd32	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/28 06:21	upstream	76c057c84d28	eefc07f2	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/27 21:13	upstream	76c057c84d28	a57db36f	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/20 08:59	upstream	45dfb8a5659a	d4f4eca5	.config	log	report	info	KCSAN: data-race in __writeback_single_inode / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/16 21:44	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/07 04:30	upstream	71c061d24438	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 22:53	upstream	3516bd729358	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/31 14:40	upstream	f6e1ea196492	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 22:07	upstream	f6e1ea196492	ecb8c012	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 20:32	upstream	5e60366d56c6	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 21:49	upstream	fab0fca1da5c	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 10:10	upstream	0477e9288185	f80ce148	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 20:54	upstream	8100a58044f8	c521566d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 09:35	upstream	7059c2c00a21	f12ba0c5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 20:26	upstream	32f741b02f1a	50503117	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 11:05	upstream	b3298500b23f	0ef84591	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/24 12:45	upstream	d5beb3140f91	1ab681a4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/20 16:05	upstream	4d02da974ea8	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/18 14:53	upstream	0fa8ee0d9ab9	09323409	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 02:17	upstream	9c87c9f41245	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/12 11:39	upstream	3d5e28bff7ad	77a55c8e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 16:18	upstream	659caaf65dc9	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/05 22:45	upstream	521b619acdc8	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/05 12:37	upstream	4ef8451b3326	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/01 21:47	upstream	31f020064f9d	8bc4594f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 20:15	upstream	986b9eacb259	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/23 12:43	upstream	f9893351acae	4e740c00	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 21:36	upstream	96485e446260	4e740c00	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/21 13:18	upstream	c4d6fe731176	99c64d5c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 01:03	upstream	bbe85027ce80	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/19 09:43	upstream	7cf726a59435	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/16 06:08	upstream	726eb70e0d34	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/15 10:40	upstream	3e4fb4346c78	63869021	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/13 00:10	upstream	1e6d1d96461e	d32b0bbf	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/09 10:31	upstream	583090b1b823	fa79ed2a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/08 20:32	upstream	3d006ee42dde	92390980	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/05 07:01	upstream	549738f15da0	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/03 15:27	upstream	d3d45f8220d6	2653fa43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/28 08:01	upstream	a1b8638ba132	6bfdbe89	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/26 05:07	upstream	7c7ec3226f5f	4a006f63	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/24 19:35	upstream	171d4ff79f96	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/23 08:46	upstream	805c6d3c1921	287cd75a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/17 12:13	upstream	5925fa68fe82	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 17:31	upstream	fc4f28bb3daf	77507d02	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 14:24	upstream	fc4f28bb3daf	77507d02	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/14 09:46	upstream	84b134997212	2d3cdd63	.config	log	report
ci2-upstream-kcsan-gce	2020/09/12 07:24	upstream	e8878ab82545	79fb24e2	.config	log	report
ci2-upstream-kcsan-gce	2020/09/11 21:19	upstream	e8878ab82545	adfb8b4e	.config	log	report
ci2-upstream-kcsan-gce	2020/09/08 19:39	upstream	6f6a73c8b715	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/03 18:22	upstream	e28f0104343d	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/03 04:12	upstream	fc3abb53250a	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 03:01	upstream	15bc20c6af4c	318430cb	.config	log	report
ci2-upstream-kcsan-gce	2020/08/20 20:25	upstream	7eac66d0456f	70160577	.config	log	report
ci2-upstream-kcsan-gce	2020/08/19 18:24	upstream	18445bf405cb	db787902	.config	log	report
ci2-upstream-kcsan-gce	2020/08/09 07:00	upstream	06a81c1c7db9	f721e4a0	.config	log	report
ci2-upstream-kcsan-gce	2020/07/20 15:31	upstream	5714ee50bb43	8caeeeb7	.config	log	report
ci2-upstream-kcsan-gce	2020/07/16 11:39	upstream	f8456690ba8e	b090c643	.config	log	report
ci2-upstream-kcsan-gce	2020/07/06 21:39	upstream	5c82ec00dd00	ef278c73	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 23:50	upstream	45a5ac7a5cc3	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 17:20	upstream	35e884f89df4	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 19:08	upstream	6116dea80dfd	a2cdad9d	.config	log	report