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: 546d, last: 10h50m

Sample crash report:

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

write to 0xffff8881260a9e08 of 8 bytes by task 22084 on cpu 1:
 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 0xffff8881260a9e08 of 8 bytes by task 22095 on cpu 0:
 i_size_read include/linux/fs.h:850 [inline]
 shmem_getpage_gfp+0x1a5/0x1410 mm/shmem.c:1814
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_file_read_iter+0x1a2/0x5c0 mm/shmem.c:2607
 __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: 0 PID: 22095 Comm: syz-executor.5 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

Crashes (303):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/23 00:01	upstream	90c911ad	590921a5	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/22 01:52	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/21 09:01	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/20 18:56	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/19 05:00	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/18 10:28	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/18 03:26	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/17 07:37	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/16 18:40	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/16 12:25	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/15 16:59	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/14 22:44	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/14 13:29	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/14 01:55	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/12 10:56	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/09 15:12	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/07 22:48	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/04 23:45	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/02 23:28	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/04/01 09:33	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/30 20:19	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/30 08:21	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/28 23:25	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/23 13:37	upstream	84196390	8092f30d	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/22 17:42	upstream	0d02ec6b	bea32f74	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/21 14:55	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/19 02:49	upstream	bf152b0b	380dcc3e	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/18 09:05	upstream	6417f031	7216542e	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/18 02:25	upstream	6417f031	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/15 01:33	upstream	75013c6c	cc1cff8f	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/03/12 05:03	upstream	28806e4d	429d8a6b	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/02/21 12:45	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/02/19 20:00	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/02/11 14:06	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/02/07 22:49	upstream	b75dba7f	2ce644fc	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/02/03 08:50	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/25 16:46	upstream	6ee1d745	52e37319	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/22 22:07	upstream	83d09ad4	52e37319	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/21 09:11	upstream	75439bc4	d4f4eca5	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/20 17:08	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/19 08:56	upstream	1e2a199f	63631df1	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/18 20:28	upstream	19c329f6	63631df1	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/18 10:34	upstream	19c329f6	fd103621	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/17 23:17	upstream	0da0a8a0	fd103621	.config	log	report	info	KCSAN: data-race in shmem_getpage_gfp / shmem_write_end
ci2-upstream-kcsan-gce	2021/01/16 04:49	upstream	5ee88057	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/02/02 23:47	https://github.com/google/ktsan.git kcsan	245a4300	93e5e335	.config	log	report
ci2-upstream-kcsan-gce	2020/02/01 07:18	https://github.com/google/ktsan.git kcsan	245a4300	0eb59c27	.config	log	report
ci2-upstream-kcsan-gce	2019/10/24 11:19	https://github.com/google/ktsan.git kcsan	05f22368	d01bb02a	.config	log	report