KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc

KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty (2)
Status: moderation: reported on 2020/10/23 14:26
Reported-by: syzbot+9f3941c56c930aeea6fe@syzkaller.appspotmail.com
First crash: 261d, last: 30d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty				18	292d	499d	0/21	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty

write to 0xffff88810d7e9a24 of 4 bytes by task 10914 on cpu 1:
 ext4_ext_insert_extent+0x120e/0x2bc0 fs/ext4/extents.c:2115
 ext4_ext_map_blocks+0x1597/0x1fd0 fs/ext4/extents.c:4259
 ext4_map_blocks+0x726/0xff0 fs/ext4/inode.c:637
 mpage_map_one_extent+0x10d/0x3a0 fs/ext4/inode.c:2396
 mpage_map_and_submit_extent fs/ext4/inode.c:2449 [inline]
 ext4_writepages+0xa51/0x1e70 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+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: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 0xffff88810d7e9a24 of 4 bytes by task 10907 on cpu 0:
 ext4_do_update_inode fs/ext4/inode.c:5114 [inline]
 ext4_mark_iloc_dirty+0xd81/0x16f0 fs/ext4/inode.c:5725
 __ext4_mark_inode_dirty+0x4d6/0x5e0 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 include/linux/fs.h:2181 [inline]
 generic_write_end+0x166/0x240 fs/buffer.c:2202
 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3111
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3419
 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:270
 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: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: 0 PID: 10907 Comm: syz-executor.0 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (99):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/05 13:09	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty
ci2-upstream-kcsan-gce	2021/02/01 01:41	upstream	1048ba83	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty
ci2-upstream-kcsan-gce	2021/01/30 09:35	upstream	0e9bcda5	fc9fd31e	.config	log	report	info	KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty
ci2-upstream-kcsan-gce	2021/01/26 13:08	upstream	13391c60	52e37319	.config	log	report	info	KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty
ci2-upstream-kcsan-gce	2021/01/17 15:23	upstream	0da0a8a0	fd103621	.config	log	report	info	KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty
ci2-upstream-kcsan-gce	2021/01/16 21:08	upstream	54c6247d	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/16 07:23	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 19:34	upstream	e609571b	0cdd6185	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 00:01	upstream	a0d54b4f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/10 00:02	upstream	2ff90100	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/06 11:26	upstream	9f1abbe9	fff20c29	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/04 04:22	upstream	e71ba945	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 21:48	upstream	3516bd72	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 00:17	upstream	eda809ae	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/30 16:47	upstream	139711f0	ecb8c012	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/28 21:35	upstream	c76e02c5	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/20 20:08	upstream	6a447b0e	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 22:21	upstream	467f8165	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 22:37	upstream	d64c6f96	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/15 10:08	upstream	148842c9	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 20:42	upstream	fab0fca1	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 20:49	upstream	ec6f5e0e	8f160dd5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 11:24	upstream	6bff9bb8	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/08 21:44	upstream	7d8761ba	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 08:47	upstream	0477e928	f80ce148	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 20:40	upstream	32f741b0	50503117	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/02 02:45	upstream	509a1542	c42a35e9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/01 11:58	upstream	b6505459	07bfe8a5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 03:50	upstream	b6505459	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 12:55	upstream	c84e1efa	3c7136c0	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/26 14:57	upstream	fa02fcd9	2f1cec62	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/24 15:39	upstream	d5beb314	e34b696c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/23 14:48	upstream	418baf2c	878fb17a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/20 17:19	upstream	4d02da97	68068804	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/18 15:27	upstream	0fa8ee0d	09323409	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 21:44	upstream	111e91a6	09323409	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 02:09	upstream	9c87c9f4	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/15 18:32	upstream	0062442e	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/15 03:50	upstream	e28c0d7c	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/11 23:26	upstream	3d5e28bf	cca87986	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/06 23:28	upstream	bf3e7628	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/31 12:49	upstream	5fc6b075	8bc4594f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/28 20:11	upstream	ed8780e3	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/27 23:58	upstream	ed8780e3	96e03c1c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/26 10:04	upstream	3650b228	a7aac492	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 22:07	upstream	986b9eac	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/21 11:19	upstream	c4d6fe73	99c64d5c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/12 08:56	upstream	bbf5c979	4a77ae0b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/11 19:26	upstream	3dd0130f	4a77ae0b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/30 22:38	upstream	7c30b859	c0383ebe	.config	log	report
ci2-upstream-kcsan-gce	2020/06/30 20:14	upstream	7c30b859	c0383ebe	.config	log	report
ci2-upstream-kcsan-gce	2020/06/30 17:23	upstream	7c30b859	917afeaa	.config	log	report
ci2-upstream-kcsan-gce	2020/06/29 15:08	upstream	9ebcfadb	ce9ef6f2	.config	log	report
ci2-upstream-kcsan-gce	2020/06/29 04:34	upstream	9ebcfadb	a2cdad9d	.config	log	report
ci2-upstream-kcsan-gce	2020/06/23 20:30	upstream	3e08a952	6930bbef	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 20:41	upstream	672f9255	123cf502	.config	log	report