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: 765d, last: 5d02h

Sample crash report:

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

write to 0xffff88813a5ae4d8 of 8 bytes by task 2218 on cpu 0:
 i_size_write include/linux/fs.h:913 [inline]
 shmem_write_end+0x60/0x370 mm/shmem.c:2480
 generic_perform_write+0x261/0x400 mm/filemap.c:3767
 __generic_file_write_iter+0xf7/0x2b0 mm/filemap.c:3883
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3915
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 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+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1304 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0xb9/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813a5ae4d8 of 8 bytes by task 2206 on cpu 1:
 i_size_read include/linux/fs.h:891 [inline]
 shmem_getpage_gfp+0x183/0x12c0 mm/shmem.c:1830
 shmem_getpage mm/shmem.c:150 [inline]
 shmem_file_read_iter+0x1b2/0x5d0 mm/shmem.c:2546
 call_read_iter include/linux/fs.h:2156 [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+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1304 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0xb9/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000cc8 -> 0x0000000000000cce

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2206 Comm: syz-executor.4 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (411):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/22 20:44	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/11/06 22:10	upstream	512b7931ad05	4c1be0be	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/11/05 20:57	upstream	fe91c4725aee	4c1be0be	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/11/05 05:42	upstream	d4439a1189f9	4c1be0be	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/11/04 16:36	upstream	7ddb58cb0eca	4c1be0be	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/11/03 14:21	upstream	dcd68326d29b	4c1be0be	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/28 07:02	upstream	1fc596a56b33	be531bb4	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/16 08:35	upstream	8fe31e0995f0	0c5d9412	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/15 04:26	upstream	26d657410983	7aa5fe41	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/11 07:24	upstream	64570fbc14f8	838e7e2c	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/11 00:36	upstream	efb52a7d9511	838e7e2c	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/09 12:03	upstream	5d6ab0bb408f	838e7e2c	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/08 19:24	upstream	1da38549dd64	efe0f24d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/07 16:25	upstream	5af4055fa813	efe0f24d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/07 00:01	upstream	60a9483534ed	62ee0987	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/06 17:01	upstream	60a9483534ed	0a63fd36	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/04 08:26	upstream	9e1ff307c779	ce697b49	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/03 11:03	upstream	7b66f4393ad4	db0f5787	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/02 03:20	upstream	53d5fc89d66a	db0f5787	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/01 18:52	upstream	24f67d82c43c	cc80db95	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/10/01 01:52	upstream	4de593fb965f	1d849ab4	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/30 13:53	upstream	02d5e016800d	0f01403d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/28 13:49	upstream	0513e464f900	d82cb927	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/28 12:00	upstream	0513e464f900	78494d16	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/25 19:45	upstream	85736168463d	8cac236e	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/25 16:18	upstream	7d42e9818258	8cac236e	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/24 08:46	upstream	f10f0481a5b5	8cac236e	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/20 00:15	upstream	20621d2f27a0	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/19 10:08	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/18 20:50	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/18 07:02	upstream	4357f03d6611	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/13 19:59	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/11 14:43	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/10 09:32	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/10 02:37	upstream	bf9f243f23e6	e2776ee4	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/07 19:39	upstream	0bcfe68b8767	6ca60148	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/07 01:59	upstream	4b93c544e90e	6ca60148	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/04 15:04	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/02 09:59	upstream	4ac6d90867a4	d0f0970b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/09/02 00:31	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/31 15:41	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/08/30 23:36	upstream	8596e589b787	8f58a0ef	.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