KCSAN: data-race in ext4_mb_find_by_goal / mb_mark

KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
Status: moderation: reported on 2020/06/13 15:14
Reported-by: syzbot+47daa2074a04c7113db2@syzkaller.appspotmail.com
First crash: 600d, last: 3d17h

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used

write to 0xffff8881013f29d4 of 4 bytes by task 24915 on cpu 1:
 mb_mark_used+0x13b/0xc50 fs/ext4/mballoc.c:1942
 ext4_mb_use_best_found+0x102/0x320 fs/ext4/mballoc.c:2014
 ext4_mb_try_best_found+0x234/0x3d0 fs/ext4/mballoc.c:2180
 ext4_mb_regular_allocator+0x22bd/0x2520 fs/ext4/mballoc.c:2778
 ext4_mb_new_blocks+0x762/0x1f90 fs/ext4/mballoc.c:5514
 ext4_alloc_branch fs/ext4/indirect.c:333 [inline]
 ext4_ind_map_blocks+0xaab/0x1620 fs/ext4/indirect.c:626
 ext4_map_blocks+0x6d2/0xef0 fs/ext4/inode.c:640
 _ext4_get_block+0xf6/0x290 fs/ext4/inode.c:794
 ext4_get_block+0x35/0x40 fs/ext4/inode.c:811
 __block_write_begin_int+0x4a2/0x1060 fs/buffer.c:2031
 __block_write_begin+0x2b/0x40 fs/buffer.c:2081
 ext4_write_begin+0x41b/0xcc0 fs/ext4/ext4_jbd2.h:498
 ext4_da_write_begin+0x20e/0x820 fs/ext4/inode.c:2960
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3660
 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269
 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_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881013f29d4 of 4 bytes by task 24930 on cpu 0:
 ext4_mb_find_by_goal+0x129/0x890 fs/ext4/mballoc.c:2202
 ext4_mb_regular_allocator+0x11c/0x2520 fs/ext4/mballoc.c:2635
 ext4_mb_new_blocks+0x762/0x1f90 fs/ext4/mballoc.c:5514
 ext4_ext_map_blocks+0x1569/0x1f00 fs/ext4/extents.c:4241
 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638
 ext4_alloc_file_blocks+0x271/0x720 fs/ext4/extents.c:4428
 ext4_zero_range+0x309/0xa40 fs/ext4/extents.c:4540
 ext4_fallocate+0x226/0x4d0 fs/ext4/extents.c:4677
 vfs_fallocate+0x463/0x660 fs/open.c:311
 ksys_fallocate fs/open.c:334 [inline]
 __do_sys_fallocate fs/open.c:342 [inline]
 __se_sys_fallocate fs/open.c:340 [inline]
 __x64_sys_fallocate+0x75/0xc0 fs/open.c:340
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000024 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24930 Comm: syz-executor.4 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (260):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/14 00:31	upstream	e4e45343	1ba81399	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/06/10 00:19	upstream	368094df	84fe5d96	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/06/07 20:05	upstream	614124be	b718257f	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/28 21:21	upstream	5ff2756a	858ea628	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/25 05:51	upstream	1434a312	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/24 14:14	upstream	c4681547	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/22 20:19	upstream	23d72926	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/21 18:08	upstream	79a106fc	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/12 18:14	upstream	dbb5afad	86294427	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/08 06:42	upstream	1ad77a05	bc5434be	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/06 23:47	upstream	8404c9fb	06585184	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/06 13:29	upstream	8404c9fb	06c27ff5	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/06 09:21	upstream	a79cdfba	06c27ff5	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/03 04:57	upstream	9ccce092	77e2b668	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/01 22:53	upstream	10a3efd0	77e2b668	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/05/01 03:34	upstream	65c61de9	77e2b668	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/28 02:06	upstream	e359bce3	805b5003	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/25 20:38	upstream	d2d09fbe	2a82f1b3	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/23 12:08	upstream	18a3c5f7	17f0b706	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/21 11:33	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/21 05:06	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/20 07:41	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/17 14:48	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/15 08:07	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/13 04:12	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/11 20:09	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/09 23:40	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/08 22:16	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/07 19:45	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/07 12:21	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/04/05 02:38	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/31 05:59	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/25 19:07	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/19 23:27	upstream	8b12a62a	3d01c4de	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/18 04:19	upstream	6417f031	fdb2bb2c	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/16 14:45	upstream	1a4431a5	fdb2bb2c	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/14 21:34	upstream	75013c6c	cc1cff8f	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/12 23:31	upstream	f296bfd5	429d8a6b	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/11 23:09	upstream	28806e4d	429d8a6b	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/11 20:01	upstream	28806e4d	c2ca1f2a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/09 18:02	upstream	144c79ef	26967e35	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/03/04 07:28	upstream	f69d02e3	d7e4e604	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/23 19:12	upstream	3b9cdafb	fcc6d71b	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/23 08:21	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/21 19:53	upstream	55f62bc8	a659b3f1	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/21 06:32	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/20 14:46	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/19 15:12	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/17 14:44	upstream	f40ddce8	052f8d9f	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/15 03:57	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/02/14 00:08	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in ext4_mb_find_by_goal / mb_mark_used
ci2-upstream-kcsan-gce	2021/01/17 11:50	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/09 14:57	https://github.com/google/ktsan.git kcsan	7c3cd68e	092934c1	.config	log	report
ci2-upstream-kcsan-gce	2019/10/26 05:54	https://github.com/google/ktsan.git kcsan	05f22368	413926c5	.config	log	report