KCSAN: data-race in __mark_inode_dirty / __writeback_single

KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode (2)
Status: moderation: reported on 2020/10/14 12:01
Reported-by: syzbot+dd7eafdc93343dca0f7d@syzkaller.appspotmail.com
First crash: 403d, last: 2d15h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode				43	430d	638d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

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

write to 0xffff888106c89cb8 of 8 bytes by task 21493 on cpu 1:
 __writeback_single_inode+0x1e9/0x440 fs/fs-writeback.c:1649
 writeback_sb_inodes+0x563/0xd10 fs/fs-writeback.c:1878
 __writeback_inodes_wb fs/fs-writeback.c:1947 [inline]
 wb_writeback+0x327/0x700 fs/fs-writeback.c:2053
 wb_check_old_data_flush fs/fs-writeback.c:2155 [inline]
 wb_do_writeback+0x461/0x510 fs/fs-writeback.c:2208
 wb_workfn+0xc8/0x520 fs/fs-writeback.c:2237
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff888106c89cb8 of 8 bytes by task 1648 on cpu 0:
 __mark_inode_dirty+0xda/0x680 fs/fs-writeback.c:2419
 generic_update_time fs/inode.c:1772 [inline]
 update_time fs/inode.c:1785 [inline]
 file_update_time+0x3a4/0x3e0 fs/inode.c:2001
 file_modified+0x62/0x80 fs/inode.c:2024
 ext4_write_checks fs/ext4/file.c:247 [inline]
 ext4_buffered_write_iter+0x1f9/0x3f0 fs/ext4/file.c:264
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 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: 0x0000000000020087 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1648 Comm: rs:main Q:Reg Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (135):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/07/29 19:54	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/26 01:13	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/24 09:45	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/23 00:14	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/14 17:26	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/12 20:41	upstream	7fef2edf7cc7	f415556d	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/12 09:21	upstream	e73f0f0ee754	a4869c92	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/11 21:01	upstream	98f7fdced2e0	8f5a7b8c	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/08 18:54	upstream	3dbdb38e2869	1b20171a	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/07/08 07:05	upstream	3dbdb38e2869	1aade754	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/30 20:59	upstream	df04fbe8680b	38a885d1	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/25 05:20	upstream	4a09d388f2ab	0edbbe31	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/24 11:56	upstream	7426cedc7dad	ec865f6a	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/21 18:45	upstream	13311e74253f	aba2b2fb	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/19 23:21	upstream	913ec3c22ef4	aba2b2fb	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/18 23:21	upstream	b1edae0d5f2e	aba2b2fb	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/17 21:13	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/15 22:25	upstream	94f0b2d4a1d0	990d3cbe	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/13 21:44	upstream	e4e453434a19	1ba81399	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/13 04:49	upstream	8ecfa36cd4db	1ba81399	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/11 09:10	upstream	06af8679449d	1ba81399	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/10 01:51	upstream	cd1245d75ce9	1ba81399	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/09 19:12	upstream	368094df48e6	84fe5d96	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/09 08:42	upstream	368094df48e6	5c2fe346	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/06 01:46	upstream	f5b6eb1e0182	500c2339	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/05 04:25	upstream	16f0596fc1d7	500c2339	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/06/04 19:06	upstream	16f0596fc1d7	966a236b	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/30 07:04	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/29 18:52	upstream	f956cb99b938	325a8dab	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/26 11:34	upstream	ad9f25d33860	750ce164	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/11 02:25	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/05/03 13:22	upstream	9ccce092fc64	ad61f371	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/30 20:08	upstream	65c61de9d090	77e2b668	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/23 12:41	upstream	18a3c5f7abfd	17f0b706	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/23 00:14	upstream	90c911ad7445	590921a5	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/22 23:10	upstream	90c911ad7445	33c28d03	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/17 20:42	upstream	194cf4825638	7e2b734b	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/17 08:08	upstream	9cdbf6467424	7e2b734b	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/13 19:42	upstream	89698becf06d	a184b83e	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/12 23:04	upstream	89698becf06d	6a81331a	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/04/11 04:05	upstream	52e44129fba5	6a81331a	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/31 07:42	upstream	5e46d1b78a03	6a81331a	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/25 10:33	upstream	e138138003eb	6a383ecf	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/23 15:36	upstream	84196390620a	e613994b	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/23 09:15	upstream	84196390620a	8092f30d	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/03/21 16:25	upstream	812da4d39463	4c9a64da	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/02 22:07	upstream	3516bd729358	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/13 22:55	upstream	6ad4bf6ea160	fc7735a2	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/24 10:34	upstream	3e08a95294a4	41694dbf	.config	log	report