KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve

KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space (6)
Status: auto-closed as invalid on 2021/08/16 16:28
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 241d, last: 98d

similar bugs (5):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space (4)	10	380d	480d	0/22	auto-closed as invalid on 2020/11/07 06:53
upstream	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space	2	707d	724d	0/22	closed as invalid on 2019/11/19 14:44
upstream	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space (3)	2	503d	522d	0/22	closed as invalid on 2020/06/18 14:24
upstream	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space (5)	1	279d	279d	0/22	auto-closed as invalid on 2021/02/16 17:07
upstream	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space (2)	7	613d	678d	0/22	auto-closed as invalid on 2020/04/23 17:25

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space

write to 0xffff88814b870858 of 4 bytes by task 13088 on cpu 0:
 ext4_da_reserve_space+0x147/0x200 fs/ext4/inode.c:1491
 ext4_insert_delayed_block fs/ext4/inode.c:1656 [inline]
 ext4_da_map_blocks fs/ext4/inode.c:1770 [inline]
 ext4_da_get_block_prep+0x512/0x9b0 fs/ext4/inode.c:1834
 __block_write_begin_int+0x4a2/0x1060 fs/buffer.c:2006
 __block_write_begin+0x2b/0x40 fs/buffer.c:2056
 ext4_da_write_begin+0x4c8/0x820 fs/ext4/inode.c:3018
 generic_perform_write+0x196/0x3c0 mm/filemap.c:3656
 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]
 aio_write+0x287/0x360 fs/aio.c:1578
 __io_submit_one fs/aio.c:1837 [inline]
 io_submit_one+0x82f/0x1350 fs/aio.c:1880
 __do_sys_io_submit fs/aio.c:1939 [inline]
 __se_sys_io_submit+0xf5/0x260 fs/aio.c:1909
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1909
 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

read to 0xffff88814b870858 of 4 bytes by task 13083 on cpu 1:
 ext4_alloc_da_blocks+0x1a/0xd0 fs/ext4/inode.c:3130
 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13083 Comm: syz-executor.5 Tainted: G        W         5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (23):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/07/12 16:28	upstream	e73f0f0ee754	a4869c92	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/07/06 22:50	upstream	3dbdb38e2869	cca78469	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/07/05 03:32	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/06/23 06:24	upstream	0c18f29aae7c	aba2b2fb	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/06/21 11:16	upstream	13311e74253f	aba2b2fb	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/06/04 07:20	upstream	f88cd3fb9df2	0740de69	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/31 13:34	upstream	8124c8a6b353	032639db	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/29 20:18	upstream	f956cb99b938	325a8dab	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/21 14:28	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/20 15:45	upstream	c3d0e3fd41b7	c560a65d	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/14 12:22	upstream	315d99318179	8bdd5343	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/13 11:00	upstream	c06a2ba62fc4	ed7d41c5	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/10 22:22	upstream	6efb943b8616	ca873091	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/08 15:24	upstream	dd860052c99b	bc5434be	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/05/02 14:27	upstream	17ae69aba89d	77e2b668	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/04/29 11:57	upstream	d72cd4ad4174	77e2b668	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/04/25 19:36	upstream	d2d09fbe33f8	2a82f1b3	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/04/24 05:28	upstream	8db5efb83fa9	17f0b706	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/04/13 08:07	upstream	89698becf06d	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/04/04 10:49	upstream	2023a53bdf41	6a81331a	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/03/25 14:52	upstream	e138138003eb	6a383ecf	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/03/24 14:49	upstream	7acac4b3196c	607e3baf	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space
ci2-upstream-kcsan-gce	2021/02/18 23:58	upstream	f40ddce88593	14052202	.config	log	report	info	KCSAN: data-race in ext4_alloc_da_blocks / ext4_da_reserve_space