KCSAN: data-race in __ext4_update_other_inode_time / writeback_single

KCSAN: data-race in __ext4_update_other_inode_time / writeback_single_inode
Status: auto-closed as invalid on 2021/03/04 14:53
Reported-by: syzbot+52fef5d0e9caf3a8bcf6@syzkaller.appspotmail.com
First crash: 252d, last: 38d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __ext4_update_other_inode_time / writeback_single_inode

write to 0xffff8880163c0678 of 8 bytes by task 14736 on cpu 1:
 writeback_single_inode+0x109/0x580 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+0x384/0x3d0 fs/ext4/file.c:278
 ext4_file_write_iter+0x45e/0x1090 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+0x112/0x4b0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x42a/0x780 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+0x5db/0xca0 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

read to 0xffff8880163c0678 of 8 bytes by task 14759 on cpu 0:
 __ext4_update_other_inode_time+0x45/0x550 fs/ext4/inode.c:4964
 ext4_update_other_inodes_time fs/ext4/inode.c:5011 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5140 [inline]
 ext4_mark_iloc_dirty+0x1276/0x16e0 fs/ext4/inode.c:5725
 __ext4_mark_inode_dirty+0x4cd/0x5d0 fs/ext4/inode.c:5919
 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5955
 __mark_inode_dirty+0x72/0x6b0 fs/fs-writeback.c:2262
 mark_inode_dirty_sync include/linux/fs.h:2186 [inline]
 dquot_claim_block include/linux/quotaops.h:364 [inline]
 ext4_da_update_reserve_space+0x160/0x2e0 fs/ext4/inode.c:380
 ext4_ext_map_blocks+0x1858/0x1fc0 fs/ext4/extents.c:4291
 ext4_map_blocks+0x700/0xfc0 fs/ext4/inode.c:637
 mpage_map_one_extent+0x10d/0x390 fs/ext4/inode.c:2396
 mpage_map_and_submit_extent fs/ext4/inode.c:2449 [inline]
 ext4_writepages+0xa51/0x1e50 fs/ext4/inode.c:2801
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422
 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:761
 ext4_sync_file+0x105/0x6e0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2737 [inline]
 ext4_buffered_write_iter+0x384/0x3d0 fs/ext4/file.c:278
 ext4_file_write_iter+0x45e/0x1090 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+0x112/0x4b0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x42a/0x780 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+0x5db/0xca0 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14759 Comm: syz-executor.2 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (38):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/01/28 14:52	upstream	76c057c8	eefc07f2	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/26 18:05	upstream	13391c60	55a7d4df	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/25 10:42	upstream	6ee1d745	52e37319	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/22 23:18	upstream	83d09ad4	52e37319	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / writeback_single_inode
ci2-upstream-kcsan-gce	2021/01/15 03:11	upstream	14662050	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/13 22:49	upstream	65f0d241	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/10 21:12	upstream	0653161f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/07 00:17	upstream	71c061d2	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 14:38	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 23:42	upstream	3516bd72	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 01:21	upstream	58cf05f5	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 04:20	upstream	3644e2d2	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 17:59	upstream	a409ed15	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 10:28	upstream	accefff5	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 21:38	upstream	5e60366d	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 21:33	upstream	ec6f5e0e	8f160dd5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 09:31	upstream	6bff9bb8	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/08 22:22	upstream	7d8761ba	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/08 09:30	upstream	cd796ed3	9af51e31	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 10:35	upstream	b3298500	0ef84591	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 06:07	upstream	b6505459	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 06:06	upstream	b6505459	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/29 08:00	upstream	23859ae4	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/03 12:44	upstream	d3d45f82	2653fa43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/15 22:25	upstream	fc4f28bb	18d7d030	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/06 21:11	upstream	dd9fb9bb	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 06:19	upstream	15bc20c6	816e0689	.config	log	report
ci2-upstream-kcsan-gce	2020/08/22 07:51	upstream	f873db9a	6436ce4b	.config	log	report
ci2-upstream-kcsan-gce	2020/08/17 07:03	upstream	2cc3c4b3	5ce13532	.config	log	report
ci2-upstream-kcsan-gce	2020/08/14 14:01	upstream	a1d21081	5ce13532	.config	log	report
ci2-upstream-kcsan-gce	2020/08/11 05:56	upstream	4bcf69e5	d3694ffb	.config	log	report
ci2-upstream-kcsan-gce	2020/08/10 12:00	upstream	fc80c51f	7adc7b65	.config	log	report
ci2-upstream-kcsan-gce	2020/08/02 04:19	upstream	d52daa86	8df85ed9	.config	log	report
ci2-upstream-kcsan-gce	2020/07/30 10:51	upstream	83bdc727	b0947553	.config	log	report
ci2-upstream-kcsan-gce	2020/07/18 05:05	upstream	6a70f89c	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/12 01:46	upstream	0aea6d5c	7ba05d2d	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 02:07	upstream	35e884f8	24d7f505	.config	log	report
ci2-upstream-kcsan-gce	2020/06/28 02:41	upstream	916a3b0f	a2cdad9d	.config	log	report