KCSAN: data-race in shmem_file_read_iter / shmem_write

KCSAN: data-race in shmem_file_read_iter / shmem_write_end
Status: moderation: reported on 2020/01/03 23:05
Reported-by: syzbot+5e4613548335cf05bf0e@syzkaller.appspotmail.com
First crash: 652d, last: 1h21m

Sample crash report:

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

write to 0xffff888107b4bde0 of 8 bytes by task 19172 on cpu 0:
 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 0xffff888107b4bde0 of 8 bytes by task 19181 on cpu 1:
 i_size_read include/linux/fs.h:849 [inline]
 shmem_file_read_iter+0x21a/0x5d0 mm/shmem.c:2588
 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: 0x0000000000000d61 -> 0x0000000000000d66

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19181 Comm: syz-executor.3 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (496):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 16:53	upstream	251a1524293d	d2d6e680	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/05 04:40	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/04 21:16	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/04 17:06	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/02 10:02	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/01 16:57	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/31 08:49	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/30 22:55	upstream	4669e13cd67f	6c236867	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/26 08:55	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/24 19:48	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/20 07:04	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/16 20:45	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/10 10:51	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/07 17:58	upstream	3dbdb38e2869	4846d5c1	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/07/03 19:11	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/25 11:26	upstream	44db63d1ad8d	0edbbe31	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/23 06:46	upstream	0c18f29aae7c	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/20 03:49	upstream	913ec3c22ef4	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/19 06:01	upstream	b1edae0d5f2e	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/18 06:40	upstream	fd0aa1a4567d	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/17 19:33	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/16 22:57	upstream	6b00bc639f1f	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/15 22:27	upstream	94f0b2d4a1d0	990d3cbe	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/15 19:01	upstream	94f0b2d4a1d0	8022d7e3	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/14 19:38	upstream	009c9aa5be65	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/13 21:03	upstream	e4e453434a19	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/13 02:08	upstream	8ecfa36cd4db	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/12 14:46	upstream	ad347abe4a98	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/06/01 16:37	upstream	c2131f7e73c9	032639db	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/31 09:12	upstream	8124c8a6b353	032639db	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/31 00:09	upstream	8124c8a6b353	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/30 17:19	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/29 09:52	upstream	6799d4f2da49	858ea628	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/28 19:37	upstream	5ff2756afde0	858ea628	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/27 23:33	upstream	d7c5303fbc8a	858ea628	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/26 23:53	upstream	7ac3a1c1ae51	858ea628	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/26 10:56	upstream	ad9f25d33860	750ce164	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/26 06:42	upstream	ad9f25d33860	93d3a9f6	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/25 18:22	upstream	a050a6d2b7e8	93d3a9f6	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/25 03:21	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/24 14:04	upstream	c4681547bcce	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/23 23:50	upstream	6ebb6814a1ef	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/23 08:01	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/22 18:42	upstream	23d729263037	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/22 04:35	upstream	45af60e7ced0	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/21 21:49	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/05/21 13:09	upstream	ba816d3c265c	3c7fef33	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/16 02:32	upstream	5ee88057889b	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/01/03 10:49	https://github.com/google/ktsan.git kcsan	245a43005292	9dcc1191	.config	log	report
ci2-upstream-kcsan-gce	2019/12/30 22:48	https://github.com/google/ktsan.git kcsan	245a43005292	6b36d338	.config	log	report
ci2-upstream-kcsan-gce	2019/10/23 05:39	https://github.com/google/ktsan.git kcsan	05f2236801fe	d0686497	.config	log	report