KCSAN: data-race in __delete_from_page_cache / ext4

KCSAN: data-race in __delete_from_page_cache / ext4_writepages (3)
Status: moderation: reported on 2020/12/07 11:25
Reported-by: syzbot+de35101ef298147513d4@syzkaller.appspotmail.com
First crash: 210d, last: 2d03h

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __delete_from_page_cache / ext4_writepages				10	310d	425d	0/21	auto-closed as invalid on 2020/06/18 13:43
upstream	KCSAN: data-race in __delete_from_page_cache / ext4_writepages (2)				3	253d	260d	0/21	auto-closed as invalid on 2020/08/01 18:05

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __delete_from_page_cache / ext4_writepages

write to 0xffff88810db38458 of 8 bytes by task 11194 on cpu 1:
 page_cache_delete mm/filemap.c:156 [inline]
 __delete_from_page_cache+0x28b/0x360 mm/filemap.c:241
 invalidate_complete_page2+0x126/0x2c0 mm/truncate.c:592
 invalidate_inode_pages2_range+0x456/0x760 mm/truncate.c:681
 __iomap_dio_rw+0x5c2/0xa30 fs/iomap/direct-io.c:535
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xe5d/0x10b0 fs/ext4/file.c:661
 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+0x7a6/0xe20 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810db38458 of 8 bytes by task 11196 on cpu 0:
 ext4_writepages+0x136/0x1e70 fs/ext4/inode.c:2670
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:424
 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:763
 ext4_sync_file+0x105/0x6e0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2843 [inline]
 ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:277
 ext4_file_write_iter+0x48a/0x10b0 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+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11196 Comm: syz-executor.0 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (50):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/03/05 18:54	upstream	280d542f	4a024a9b	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/30 23:46	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/27 10:14	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/26 12:42	upstream	13391c60	52e37319	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/25 22:45	upstream	f8ad8187	52e37319	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/20 09:32	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/20 05:37	upstream	45dfb8a5	63631df1	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/18 04:16	upstream	19c329f6	fd103621	.config	log	report	info	KCSAN: data-race in __delete_from_page_cache / ext4_writepages
ci2-upstream-kcsan-gce	2021/01/17 10:02	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 18:32	upstream	5ee88057	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/10 21:31	upstream	0653161f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/28 19:45	upstream	5c8fe583	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 22:39	upstream	8653b778	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 11:40	upstream	a409ed15	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 07:28	upstream	2c85ebc5	b22a7ec3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 20:53	upstream	ec6f5e0e	8f160dd5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 20:42	upstream	cd796ed3	51a9082e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 21:50	upstream	32f741b0	50503117	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 07:40	upstream	b3298500	0ef84591	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/01 12:37	upstream	b6505459	07bfe8a5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/29 14:44	upstream	aae5ab85	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/27 15:46	upstream	85a2c56c	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/26 05:03	upstream	fa02fcd9	2f1cec62	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/25 20:51	upstream	fa02fcd9	3f581b43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 01:38	upstream	9c87c9f4	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/08 20:44	upstream	9dbc1c03	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/26 08:53	upstream	3650b228	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 01:23	upstream	bbe85027	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/15 11:05	upstream	3e4fb434	63869021	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/08 13:29	upstream	c85fb28b	92390980	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/01 10:04	upstream	60e72093	4103fce0	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 09:58	upstream	325d0eab	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 03:18	upstream	325d0eab	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 09:14	upstream	92ab97ad	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 07:14	upstream	4cbffc46	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 23:38	upstream	5925fa68	77507d02	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/16 01:06	upstream	fc4f28bb	18d7d030	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/15 19:22	upstream	fc4f28bb	9e681632	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/08 20:33	upstream	6f6a73c8	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/07 00:33	upstream	a8205e31	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/05 18:12	upstream	9322c47b	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/30 22:14	upstream	dcc5c6f0	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/28 19:16	upstream	15bc20c6	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 03:10	upstream	15bc20c6	318430cb	.config	log	report
ci2-upstream-kcsan-gce	2020/08/26 09:23	upstream	2ac69819	344da168	.config	log	report
ci2-upstream-kcsan-gce	2020/08/21 06:27	upstream	da2968ff	1d75fe45	.config	log	report
ci2-upstream-kcsan-gce	2020/08/20 22:13	upstream	da2968ff	70160577	.config	log	report
ci2-upstream-kcsan-gce	2020/08/10 16:23	upstream	fc80c51f	7adc7b65	.config	log	report
ci2-upstream-kcsan-gce	2020/08/09 04:12	upstream	06a81c1c	f721e4a0	.config	log	report