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: 785d, last: 3h56m

Sample crash report:

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

write to 0xffff88812790c2a8 of 8 bytes by task 6897 on cpu 0:
 i_size_write include/linux/fs.h:913 [inline]
 generic_write_end+0x96/0x180 fs/buffer.c:2186
 ext4_da_write_end+0x4de/0x630 fs/ext4/inode.c:3059
 generic_perform_write+0x261/0x400 mm/filemap.c:3767
 ext4_buffered_write_iter+0x25b/0x380 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x1200
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812790c2a8 of 8 bytes by task 6896 on cpu 1:
 i_size_read include/linux/fs.h:891 [inline]
 mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2187
 mpage_prepare_extent_to_map+0x4f6/0x650 fs/ext4/inode.c:2621
 ext4_writepages+0xa78/0x1e80 fs/ext4/inode.c:2793
 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc mm/filemap.c:407 [inline]
 __filemap_fdatawrite_range mm/filemap.c:440 [inline]
 __filemap_fdatawrite mm/filemap.c:446 [inline]
 filemap_flush+0xd7/0x100 mm/filemap.c:473
 ext4_alloc_da_blocks+0x47/0x100 fs/ext4/inode.c:3103
 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141
 __fput+0x295/0x520 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 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+0x160/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000625000 -> 0x0000000000626000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 6896 Comm: syz-executor.0 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1896):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/27 19:25	upstream	741392771338	63eeac02	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/26 22:23	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/26 08:51	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/25 19:06	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/25 17:39	upstream	5f53fa508db0	63eeac02	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/24 19:06	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/23 22:35	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/22 12:57	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/22 11:34	upstream	136057256686	4eb20a4e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/21 22:22	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/21 09:08	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/20 20:03	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/20 02:46	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/19 14:23	upstream	4c388a8e740d	3a9d0024	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/19 10:30	upstream	4c388a8e740d	31a30fc0	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/18 21:46	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/18 14:11	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/18 06:44	upstream	42eb8fdac2fc	cafff8b6	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/17 17:19	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/16 22:29	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/16 09:59	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/15 11:17	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/14 22:08	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/14 08:55	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/13 19:32	upstream	a9b9669d9822	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/13 02:15	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/12 13:04	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/12 00:11	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/11 07:32	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/10 18:28	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/10 12:30	upstream	cb690f5238d7	75b04091	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/10 01:23	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/09 13:56	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/08 23:40	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/08 18:15	upstream	e851dfae4371	d29682f1	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/08 11:41	upstream	6b75d88fa81b	d29682f1	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/08 00:15	upstream	6b75d88fa81b	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/07 11:02	upstream	b5013d084e03	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/06 21:51	upstream	512b7931ad05	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/05 18:54	upstream	fe91c4725aee	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/05 05:29	upstream	d4439a1189f9	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/05 05:28	upstream	d4439a1189f9	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/04 16:16	upstream	7ddb58cb0eca	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/04 03:07	upstream	ce840177930f	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/03 14:08	upstream	dcd68326d29b	4c1be0be	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/03 06:26	upstream	56d33754481f	17f3edd2	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/02 16:43	upstream	bfc484fe6abb	17f3edd2	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/02 11:30	upstream	bfc484fe6abb	098b5d53	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/01 22:25	upstream	e66435936756	098b5d53	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/11/01 01:14	upstream	8bb7eca972ad	098b5d53	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/10/31 11:44	upstream	180eca540ae0	098b5d53	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/10/30 21:56	upstream	119c85055d86	098b5d53	.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