KCSAN: data-race in shmem_getpage_gfp / shmem_write

KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
Status: moderation: reported on 2020/02/05 07:38
Reported-by: syzbot+9b7038569bf2cea1082a@syzkaller.appspotmail.com
First crash: 651d, last: 12h34m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in shmem_getpage_gfp / shmem_write_end

write to 0xffff8881032d18a0 of 8 bytes by task 26338 on cpu 1:
 i_size_write include/linux/fs.h:871 [inline]
 shmem_write_end+0x60/0x3d0 mm/shmem.c:2505
 generic_perform_write+0x22a/0x3c0 mm/filemap.c:3667
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3783
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3815
 call_write_iter include/linux/fs.h:2114 [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:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881032d18a0 of 8 bytes by task 26334 on cpu 0:
 i_size_read include/linux/fs.h:849 [inline]
 shmem_getpage_gfp+0x1a6/0x13d0 mm/shmem.c:1826
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_file_read_iter+0x1ae/0x5d0 mm/shmem.c:2571
 call_read_iter include/linux/fs.h:2108 [inline]
 generic_file_splice_read+0x22a/0x310 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 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_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000a7f -> 0x0000000000000a82

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26334 Comm: syz-executor.2 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (352):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 04:46	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/04 16:44	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/02 10:36	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/01 02:53	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/31 09:22	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/30 14:16	upstream	764a5bc89b12	c585c7b0	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/20 08:19	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/19 15:56	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/19 09:35	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/11 22:48	upstream	98f7fdced2e0	8f5a7b8c	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/07 04:28	upstream	3dbdb38e2869	cca78469	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/04 00:30	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/02 09:35	upstream	e058a84bfddc	658ebc66	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/19 06:33	upstream	b1edae0d5f2e	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/18 01:51	upstream	fd0aa1a4567d	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/17 22:34	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/16 22:40	upstream	6b00bc639f1f	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/15 10:17	upstream	009c9aa5be65	8022d7e3	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/15 00:39	upstream	009c9aa5be65	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/13 05:03	upstream	8ecfa36cd4db	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/12 18:41	upstream	ad347abe4a98	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/31 18:07	upstream	c2131f7e73c9	032639db	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/30 07:28	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/29 04:11	upstream	5ff2756afde0	858ea628	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/28 16:05	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/27 18:25	upstream	d7c5303fbc8a	858ea628	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/27 02:22	upstream	7ac3a1c1ae51	858ea628	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/25 16:57	upstream	a050a6d2b7e8	93d3a9f6	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/25 14:02	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/23 16:06	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/22 19:46	upstream	23d729263037	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/11 13:05	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/10 20:23	upstream	6efb943b8616	ca873091	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/06 09:32	upstream	a79cdfba68a1	06c27ff5	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/05 04:14	upstream	d665ea6ea86c	06c27ff5	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/03 20:31	upstream	6f8ee8d36d07	ad61f371	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/03 13:20	upstream	9ccce092fc64	ad61f371	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/02 12:46	upstream	17ae69aba89d	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/01 22:48	upstream	10a3efd0fee5	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/01 13:59	upstream	9f67672a817e	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/30 21:25	upstream	65c61de9d090	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/29 10:02	upstream	68a32ba14177	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/28 05:37	upstream	e359bce39d90	77e2b668	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/16 04:49	upstream	5ee88057889b	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/02/02 23:47	https://github.com/google/ktsan.git kcsan	245a43005292	93e5e335	.config	log	report
ci2-upstream-kcsan-gce	2020/02/01 07:18	https://github.com/google/ktsan.git kcsan	245a43005292	0eb59c27	.config	log	report
ci2-upstream-kcsan-gce	2019/10/24 11:19	https://github.com/google/ktsan.git kcsan	05f2236801fe	d01bb02a	.config	log	report