KCSAN: data-race in ext4_set_iomap / writeback_single

KCSAN: data-race in ext4_set_iomap / writeback_single_inode (2)
Status: auto-closed as invalid on 2021/03/08 23:38
Reported-by: syzbot+feee6316afbfff283cc7@syzkaller.appspotmail.com
First crash: 385d, last: 173d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_set_iomap / writeback_single_inode				13	407d	578d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ext4_set_iomap / writeback_single_inode

write to 0xffff88810d9616f8 of 8 bytes by task 12897 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:1312 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xa9/0x130 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 0xffff88810d9616f8 of 8 bytes by task 12892 on cpu 1:
 ext4_inode_datasync_dirty fs/ext4/inode.c:3331 [inline]
 ext4_set_iomap+0x17c/0x460 fs/ext4/inode.c:3346
 ext4_iomap_begin+0x64b/0x6a0 fs/ext4/inode.c:3485
 iomap_apply+0x8d/0x4a0 fs/iomap/apply.c:46
 __iomap_dio_rw+0x448/0x9b0 fs/iomap/direct-io.c:517
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:605
 ext4_dio_write_iter fs/ext4/file.c:552 [inline]
 ext4_file_write_iter+0xe6a/0x1060 fs/ext4/file.c:662
 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: 12892 Comm: syz-executor.2 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (76):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/01 23:37	upstream	88bb507a74ea	e6b95f32	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/02/01 02:32	upstream	1048ba83fb1c	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/30 12:54	upstream	0e9bcda5d286	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/26 20:35	upstream	13391c60da33	55a7d4df	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/22 08:27	upstream	83d09ad4b950	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/21 20:15	upstream	9791581c049c	d4f4eca5	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/19 19:06	upstream	1e2a199f6ccd	63631df1	.config	log	report	info	KCSAN: data-race in ext4_set_iomap / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/17 12:28	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/16 23:40	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 08:36	upstream	146620506274	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 15:04	upstream	a0d54b4f5b21	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/11 21:59	upstream	7c53f6b671f4	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/07 02:03	upstream	71c061d24438	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/04 20:31	upstream	36bbbd0e234d	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 14:49	upstream	139711f033f6	ecb8c012	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 13:57	upstream	f838f8d2b694	2242f77f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 05:38	upstream	f838f8d2b694	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/26 15:14	upstream	40f78232f973	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 02:59	upstream	3913d00ac51a	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 03:55	upstream	58cf05f597b0	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 02:55	upstream	614cb5894306	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 02:07	upstream	8653b778e454	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/20 23:53	upstream	6a447b0e3151	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 10:04	upstream	d64c6f96ba86	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 10:54	upstream	d01e7f10dae2	649595c6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 23:31	upstream	fab0fca1da5c	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 11:12	upstream	6bff9bb8a292	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/11 14:16	upstream	33dc9614dc20	ba24ffcd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 01:44	upstream	7d8761ba27fc	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 04:14	upstream	b65054597872	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/29 02:13	upstream	67f34fa8893e	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 09:52	upstream	c84e1efae022	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/27 16:27	upstream	85a2c56cb445	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/26 22:41	upstream	4df910620beb	2f1cec62	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/25 23:47	upstream	fa02fcd94b0c	3f581b43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/23 18:03	upstream	418baf2c28f3	878fb17a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/18 22:09	upstream	c2e7554e1b85	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/16 00:09	upstream	0062442ecfef	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 18:26	upstream	f01c30de86f1	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 02:04	upstream	9e6a39eae450	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/04 02:54	upstream	4ef8451b3326	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 03:23	upstream	d76913908102	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/15 21:05	upstream	726eb70e0d34	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/11 22:54	upstream	3dd0130f2430	4a77ae0b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/09 20:21	upstream	583090b1b823	fa79ed2a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/08 20:58	upstream	3d006ee42dde	92390980	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/02 12:50	upstream	472e5b056f00	9602ddf4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/02 10:46	upstream	fcadab740480	9602ddf4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/28 02:28	upstream	a1b8638ba132	5dd8aee8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/27 12:22	upstream	eeddbe6841cd	5dd8aee8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/23 08:04	upstream	805c6d3c1921	287cd75a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 13:53	upstream	325d0eab4f31	9564d2e9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 23:44	upstream	eb5f95f1593f	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 14:26	upstream	eb5f95f1593f	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 15:16	upstream	10b82d517648	38962c8b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 04:20	upstream	4cbffc461ec9	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 02:05	upstream	fc4f28bb3daf	18d7d030	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/15 18:32	upstream	fc4f28bb3daf	9e681632	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/14 03:56	upstream	84b134997212	2d3cdd63	.config	log	report
ci2-upstream-kcsan-gce	2020/09/09 23:28	upstream	34d4ddd359db	ac7ca78e	.config	log	report
ci2-upstream-kcsan-gce	2020/09/08 19:59	upstream	6f6a73c8b715	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/07 16:54	upstream	f4d51dffc6c0	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/04 09:32	upstream	59126901f200	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/03 03:28	upstream	fc3abb53250a	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/30 20:35	upstream	dcc5c6f013d8	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/28 17:17	upstream	15bc20c6af4c	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 04:21	upstream	15bc20c6af4c	318430cb	.config	log	report
ci2-upstream-kcsan-gce	2020/08/22 17:19	upstream	f873db9acd3c	6436ce4b	.config	log	report
ci2-upstream-kcsan-gce	2020/08/04 21:44	upstream	c0842fbc1b18	02034dac	.config	log	report
ci2-upstream-kcsan-gce	2020/08/02 08:44	upstream	ac3a0c847296	96dd3623	.config	log	report
ci2-upstream-kcsan-gce	2020/08/01 09:46	upstream	7dc6fd0f3b84	8df85ed9	.config	log	report
ci2-upstream-kcsan-gce	2020/07/27 06:58	upstream	92ed30191993	cb93dc6a	.config	log	report
ci2-upstream-kcsan-gce	2020/07/24 20:44	upstream	f37e99aca03f	554af388	.config	log	report
ci2-upstream-kcsan-gce	2020/07/15 18:26	upstream	e9919e11e219	ada108d0	.config	log	report
ci2-upstream-kcsan-gce	2020/07/14 10:28	upstream	0dc589da873b	ce4c95b3	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 14:57	upstream	35e884f89df4	22f87567	.config	log	report