KCSAN: data-race in ondemand_readahead / ondemand

KCSAN: data-race in ondemand_readahead / ondemand_readahead (2)
Status: auto-closed as invalid on 2021/03/05 09:30
Reported-by: syzbot+75c8f278444ac898e162@syzkaller.appspotmail.com
First crash: 404d, last: 185d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ondemand_readahead / ondemand_readahead (4)	1	108d	108d	0/22	auto-closed as invalid on 2021/05/21 19:40
upstream	KCSAN: data-race in ondemand_readahead / ondemand_readahead (5)	2	64d	69d	0/22	auto-closed as invalid on 2021/07/05 00:47
upstream	KCSAN: data-race in ondemand_readahead / ondemand_readahead	44	411d	624d	0/22	closed as invalid on 2020/06/18 14:24
upstream	KCSAN: data-race in ondemand_readahead / ondemand_readahead (3)	1	145d	145d	0/22	auto-closed as invalid on 2021/04/14 20:49

Sample crash report:

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

write to 0xffff888107bc52a4 of 4 bytes by task 11755 on cpu 0:
 ondemand_readahead+0x31e/0x780 mm/readahead.c:528
 page_cache_sync_ra+0x1ab/0x1c0 mm/readahead.c:577
 page_cache_sync_readahead include/linux/pagemap.h:839 [inline]
 generic_file_buffered_read_get_pages+0x234/0xaf0 mm/filemap.c:2361
 generic_file_buffered_read+0x27f/0x9a0 mm/filemap.c:2481
 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2633
 call_read_iter include/linux/fs.h:1895 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:788 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5db/0xca0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888107bc52a4 of 4 bytes by task 11761 on cpu 1:
 ondemand_readahead+0x4dd/0x780 mm/readahead.c:549
 page_cache_sync_ra+0x1ab/0x1c0 mm/readahead.c:577
 page_cache_sync_readahead include/linux/pagemap.h:839 [inline]
 generic_file_buffered_read_get_pages+0x234/0xaf0 mm/filemap.c:2361
 generic_file_buffered_read+0x27f/0x9a0 mm/filemap.c:2481
 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2633
 call_read_iter include/linux/fs.h:1895 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:788 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5db/0xca0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11761 Comm: syz-executor.0 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (201):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/01/29 09:29	upstream	bec4c2968fce	6593fd32	.config	log	report	info	KCSAN: data-race in ondemand_readahead / ondemand_readahead
ci2-upstream-kcsan-gce	2021/01/09 12:23	upstream	996e435fd401	a6c52263	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 07:08	upstream	eda809aef534	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 14:26	upstream	a409ed156a90	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 15:42	upstream	d01e7f10dae2	649595c6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/15 16:54	upstream	148842c98a24	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/15 02:50	upstream	fab0fca1da5c	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/10 01:34	upstream	ca4bbdaf1716	c090b4da	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 13:05	upstream	a68a0262abda	99917735	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/08 09:32	upstream	cd796ed33450	9af51e31	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/08 00:38	upstream	cd796ed33450	51a9082e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 10:24	upstream	0477e9288185	f80ce148	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 00:45	upstream	8100a58044f8	c521566d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 09:16	upstream	7059c2c00a21	f12ba0c5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 21:55	upstream	32f741b02f1a	50503117	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 09:53	upstream	b3298500b23f	0ef84591	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/04 20:07	upstream	e87297fa080a	20366b87	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/01 18:24	upstream	b65054597872	07bfe8a5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/29 04:02	upstream	67f34fa8893e	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 17:06	upstream	c84e1efae022	3c7136c0	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/27 16:33	upstream	85a2c56cb445	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/27 10:21	upstream	4df910620beb	5018c946	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/23 21:28	upstream	418baf2c28f3	878fb17a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/22 05:47	upstream	a349e4c65960	0d27f508	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/21 21:13	upstream	27bba9c532a8	c7ec2d19	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 16:09	upstream	585e5b17b92d	4a7fa9b4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/12 11:16	upstream	3d5e28bff7ad	77a55c8e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/11 20:29	upstream	eccc87672492	cca87986	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 23:55	upstream	3552c3709c0e	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/06 00:32	upstream	521b619acdc8	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/03 14:50	upstream	b7cbaf59f62f	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/02 05:44	upstream	31f020064f9d	8bc4594f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/31 12:28	upstream	5fc6b075e165	8bc4594f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/30 11:21	upstream	07e088730245	a6e3ac3b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/29 21:20	upstream	23859ae44402	a0c7169a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/29 09:54	upstream	23859ae44402	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/28 19:08	upstream	ed8780e3f2ec	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/27 11:40	upstream	4525c8781ec0	94942294	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/27 05:09	upstream	41ba50b0572e	8b3eaf58	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/24 19:17	upstream	f11901ed723d	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/24 01:24	upstream	0adc313c4f20	2bb6666c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 18:55	upstream	96485e446260	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/20 06:11	upstream	7eac66d0456f	ed282a3a	.config	log	report
ci2-upstream-kcsan-gce	2020/08/20 02:10	upstream	18445bf405cb	ed282a3a	.config	log	report
ci2-upstream-kcsan-gce	2020/06/25 04:50	upstream	26e122e97a3d	9d60b18e	.config	log	report