KCSAN: data-race in generic_write_end / mpage_process_page

KCSAN: data-race in generic_write_end / mpage_process_page_bufs
Status: moderation: reported on 2019/10/08 22:29
Reported-by: syzbot+7d49c34deef9c3ddc57f@syzkaller.appspotmail.com
First crash: 671d, last: 1h22m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in generic_write_end / mpage_process_page_bufs

write to 0xffff888106a0c6c0 of 8 bytes by task 5855 on cpu 1:
 i_size_write include/linux/fs.h:871 [inline]
 generic_write_end+0x96/0x180 fs/buffer.c:2182
 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3110
 generic_perform_write+0x22a/0x3c0 mm/filemap.c:3667
 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_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 0xffff888106a0c6c0 of 8 bytes by task 5861 on cpu 0:
 i_size_read include/linux/fs.h:849 [inline]
 mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2192
 mpage_prepare_extent_to_map+0x4e6/0x640 fs/ext4/inode.c:2626
 ext4_writepages+0x9d8/0x1d10 fs/ext4/inode.c:2798
 do_writepages+0x7b/0x150 mm/page-writeback.c:2355
 __filemap_fdatawrite_range mm/filemap.c:413 [inline]
 __filemap_fdatawrite mm/filemap.c:421 [inline]
 filemap_flush+0x132/0x160 mm/filemap.c:448
 ext4_alloc_da_blocks+0x47/0xd0 fs/ext4/inode.c:3164
 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: 0x00000000007d3000 -> 0x00000000007d5000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5861 Comm: syz-executor.0 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1573):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 15:55	upstream	251a1524293d	d2d6e680	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/08/05 04:01	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/08/04 20:41	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/08/04 15:59	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/08/03 17:29	upstream	d5ad8ec3cfb5	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/08/02 09:37	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/08/01 20:06	upstream	d4affd6b6e81	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/31 21:29	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/31 08:13	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/30 18:43	upstream	4669e13cd67f	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/30 16:56	upstream	764a5bc89b12	6c236867	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/30 05:32	upstream	764a5bc89b12	c585c7b0	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/30 04:17	upstream	7e96bf476270	c585c7b0	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/29 17:17	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/29 16:12	upstream	4010a528219e	8a799410	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/29 04:13	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/28 18:12	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/28 16:23	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/27 22:02	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/27 15:37	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/26 06:15	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/26 02:39	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/25 13:11	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/24 23:53	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/24 09:47	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/24 03:45	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/23 13:46	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/22 11:16	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/22 09:42	upstream	3d5895cd3517	29c3f20f	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/21 20:08	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/21 13:14	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/20 11:54	upstream	2734d6c1b1a0	1b201b48	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/19 22:24	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/19 10:17	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/19 08:23	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/18 19:16	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/18 00:41	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/17 11:41	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/16 22:38	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/16 08:56	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/15 19:44	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/15 15:40	upstream	8096acd7442e	f115ae98	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/15 00:12	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/14 16:54	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/14 12:18	upstream	40226a3d96ef	94e0b707	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/14 00:07	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/13 19:51	upstream	40226a3d96ef	70168d5c	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/13 12:02	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/07/12 20:03	upstream	7fef2edf7cc7	f415556d	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/01/17 10:13	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/04 14:07	https://github.com/google/ktsan.git kcsan	b4bd934316dc	c86336cf	.config	log	report