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: 548d, last: 12h16m

Sample crash report:

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

write to 0xffff888103d55610 of 8 bytes by task 5496 on cpu 0:
 i_size_write include/linux/fs.h:872 [inline]
 shmem_write_end+0x60/0x3d0 mm/shmem.c:2541
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3586
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3704
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3736
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103d55610 of 8 bytes by task 5502 on cpu 1:
 i_size_read include/linux/fs.h:850 [inline]
 shmem_file_read_iter+0x43b/0x5c0 mm/shmem.c:2596
 __kernel_read+0x306/0x580 fs/read_write.c:454
 kernel_read+0x58/0x70 fs/read_write.c:472
 kernel_read_file+0x377/0x500 fs/kernel_read_file.c:93
 kernel_read_file_from_fd+0x62/0xb0 fs/kernel_read_file.c:184
 __do_sys_finit_module kernel/module.c:4133 [inline]
 __se_sys_finit_module kernel/module.c:4117 [inline]
 __x64_sys_finit_module+0xbc/0x110 kernel/module.c:4117
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5502 Comm: syz-executor.1 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Module has invalid ELF structures
Module has invalid ELF structures

Crashes (427):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/22 22:19	upstream	16fc44d6	33c28d03	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/21 20:11	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/20 16:02	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/19 22:27	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/19 20:02	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/19 08:19	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/18 09:46	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/17 20:39	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/17 07:10	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/16 17:52	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/16 12:38	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/16 05:59	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/15 16:42	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/15 00:01	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/14 13:18	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/13 23:08	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/13 21:01	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/13 00:02	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/12 10:17	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/11 22:35	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/11 04:54	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/10 04:53	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/09 12:19	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/08 23:12	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/08 06:54	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/03 13:04	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/03 04:00	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/02 08:39	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/02 02:51	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/30 16:47	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/29 23:53	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/29 11:56	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/28 20:51	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/27 04:11	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/26 12:16	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/25 23:22	upstream	00232240	6a383ecf	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/25 09:00	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/24 19:26	upstream	4ee998b0	607e3baf	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/24 17:15	upstream	7acac4b3	607e3baf	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/23 15:23	upstream	84196390	e613994b	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/23 09:47	upstream	84196390	8092f30d	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/22 20:07	upstream	0d02ec6b	8092f30d	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/22 09:05	upstream	5ee96fa9	bea32f74	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/21 18:49	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/20 22:31	upstream	812da4d3	17810eae	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/20 13:23	upstream	1c273e10	e45f5621	.config	log	report	info	KCSAN: data-race in shmem_file_read_iter / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/20 01:57	upstream	8b12a62a	3d01c4de	.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	5ee88057	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/01/03 10:49	https://github.com/google/ktsan.git kcsan	245a4300	9dcc1191	.config	log	report
ci2-upstream-kcsan-gce	2019/12/30 22:48	https://github.com/google/ktsan.git kcsan	245a4300	6b36d338	.config	log	report
ci2-upstream-kcsan-gce	2019/10/23 05:39	https://github.com/google/ktsan.git kcsan	05f22368	d0686497	.config	log	report