KCSAN: data-race in filemap_read / filemap

KCSAN: data-race in filemap_read / filemap_read
Status: moderation: reported on 2021/08/05 09:46
Reported-by: syzbot+74bcf83a971e0c78aabd@syzkaller.appspotmail.com
First crash: 230d, last: 19h38m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in filemap_read / filemap_read

write to 0xffff8881380219b0 of 8 bytes by task 13124 on cpu 1:
 filemap_read+0xf1c/0x1220 mm/filemap.c:2687
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2157 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff8881380219b0 of 8 bytes by task 13129 on cpu 0:
 filemap_read+0xf1c/0x1220 mm/filemap.c:2687
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2157 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000076000 -> 0x0000000000080000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13129 Comm: syz-executor.0 Tainted: G        W         5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (137):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/10/23 17:36	upstream	9c0c4d24ac00	282f03fb	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/22 13:35	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/18 08:50	upstream	cf52ad5ff16c	0c5d9412	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/17 07:08	upstream	d999ade1cc86	0c5d9412	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/15 00:10	upstream	26d657410983	7aa5fe41	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/13 23:46	upstream	348949d9a444	5462d470	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/12 22:37	upstream	f4d0cc426f77	08362356	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/11 10:43	upstream	64570fbc14f8	838e7e2c	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/07 17:54	upstream	4a16df549d23	efe0f24d	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/07 02:22	upstream	5af4055fa813	62ee0987	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/06 18:33	upstream	60a9483534ed	62ee0987	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/06 01:09	upstream	60a9483534ed	0a63fd36	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/05 03:27	upstream	84b3e42564ac	ce697b49	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/10/04 08:54	upstream	9e1ff307c779	ce697b49	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/29 16:46	upstream	a4e6f95a891a	e08fe937	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/28 19:52	upstream	d33bec7b3dfa	d82cb927	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/28 10:38	upstream	0513e464f900	78494d16	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/27 17:43	upstream	5816b3e6577e	78494d16	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/26 22:18	upstream	996148ee05d0	78494d16	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/26 11:35	upstream	a3b397b4fffb	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/25 19:27	upstream	85736168463d	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/25 00:25	upstream	7d42e9818258	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/24 09:20	upstream	f9e36107ec70	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/23 20:21	upstream	f10f0481a5b5	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/23 14:30	upstream	58e2cf5d7946	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/22 17:29	upstream	cf1d2c3e7e2f	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/22 14:35	upstream	92477dd1faa6	8cac236e	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/22 04:37	upstream	92477dd1faa6	169724fe	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/22 02:12	upstream	d9fb678414c0	169724fe	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/21 07:10	upstream	e8f71f89236e	af796c18	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/19 20:51	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/19 09:05	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/17 14:50	upstream	bdb575f87217	70b76c1d	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/17 02:31	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/16 14:01	upstream	ff1ffd71d5f0	aae492f2	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/16 08:39	upstream	ff1ffd71d5f0	07e953c1	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/15 20:06	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/15 07:13	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/14 16:16	upstream	1619b69edce1	07e953c1	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/14 10:18	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/13 19:45	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/13 09:13	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/12 17:23	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/12 09:17	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/11 13:08	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/11 02:31	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/10 21:10	upstream	e99f23c5bf59	5ae8508a	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/09/10 19:25	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/08/04 20:52	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/08/01 09:36	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read
ci2-upstream-kcsan-gce	2021/03/08 09:34	upstream	144c79ef3353	09fbf400	.config	log	report	info	KCSAN: data-race in filemap_read / filemap_read