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: 566d, last: 11h11m

Sample crash report:

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

write to 0xffff888105f8dc80 of 8 bytes by task 16270 on cpu 0:
 i_size_write include/linux/fs.h:872 [inline]
 generic_write_end+0x96/0x180 fs/buffer.c:2187
 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3112
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3586
 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:502
 call_write_iter include/linux/fs.h:1977 [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+0x40a/0x750 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888105f8dc80 of 8 bytes by task 16261 on cpu 1:
 i_size_read include/linux/fs.h:850 [inline]
 mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2194
 mpage_prepare_extent_to_map+0x4e6/0x640 fs/ext4/inode.c:2628
 ext4_writepages+0x9d8/0x1d10 fs/ext4/inode.c:2800
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range mm/filemap.c:424 [inline]
 __filemap_fdatawrite mm/filemap.c:432 [inline]
 filemap_flush+0x132/0x160 mm/filemap.c:459
 ext4_alloc_da_blocks+0x4a/0xd0 fs/ext4/inode.c:3166
 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:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16261 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
==================================================================
BUG: KCSAN: data-race in ext4_writepages / generic_write_end

write to 0xffff888105f8dc80 of 8 bytes by task 16270 on cpu 0:
 i_size_write include/linux/fs.h:872 [inline]
 generic_write_end+0x96/0x180 fs/buffer.c:2187
 ext4_da_write_end+0x59b/0x730 fs/ext4/inode.c:3112
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3586
 ext4_buffered_write_iter+0x2f2/0x3f0 fs/ext4/file.c:269
 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:502
 call_write_iter include/linux/fs.h:1977 [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+0x40a/0x750 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888105f8dc80 of 8 bytes by task 16261 on cpu 1:
 i_size_read include/linux/fs.h:850 [inline]
 mpage_submit_page fs/ext4/inode.c:2096 [inline]
 mpage_map_and_submit_buffers fs/ext4/inode.c:2350 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2489 [inline]
 ext4_writepages+0x1008/0x1d10 fs/ext4/inode.c:2802
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range mm/filemap.c:424 [inline]
 __filemap_fdatawrite mm/filemap.c:432 [inline]
 filemap_flush+0x132/0x160 mm/filemap.c:459
 ext4_alloc_da_blocks+0x4a/0xd0 fs/ext4/inode.c:3166
 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:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16261 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1286):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/22 22:47	upstream	90c911ad	33c28d03	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/22 11:34	upstream	16fc44d6	33c28d03	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/21 20:06	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/21 18:07	upstream	16fc44d6	95777977	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/21 07:55	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/21 00:13	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/20 07:31	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/19 22:35	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/19 19:24	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/19 07:28	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/18 22:52	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/18 09:28	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/17 20:07	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/17 06:57	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/16 17:48	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/16 12:22	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/16 05:44	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/15 16:26	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/14 10:11	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/13 21:51	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/13 18:40	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/12 22:40	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/12 09:20	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/11 19:24	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/11 03:57	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/10 14:42	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/10 00:45	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/09 11:10	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/08 21:59	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/08 08:30	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/07 19:10	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/06 21:09	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/06 20:56	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/04 22:08	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/03 13:42	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/02 23:30	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/02 07:17	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/04/01 18:02	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/31 05:46	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/30 16:26	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/29 20:11	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/29 10:27	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/28 20:14	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in generic_write_end / mpage_process_page_bufs
ci2-upstream-kcsan-gce	2021/03/27 00:23	upstream	0f4498ce	a8529b82	.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	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/04 14:07	https://github.com/google/ktsan.git kcsan	b4bd9343	c86336cf	.config	log	report