KCSAN: data-race in __find_get_block / has_bh_in

KCSAN: data-race in __find_get_block / has_bh_in_lru
Status: moderation: reported on 2020/02/03 02:48
Reported-by: syzbot+aa6de90d54fa7c0888ad@syzkaller.appspotmail.com
First crash: 765d, last: 1d00h

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

write to 0xffff888237d281e0 of 8 bytes by task 17214 on cpu 1:
 bh_lru_install fs/buffer.c:1251 [inline]
 __find_get_block+0x42e/0x9b0 fs/buffer.c:1310
 __getblk_gfp+0x2d/0x530 fs/buffer.c:1330
 sb_getblk include/linux/buffer_head.h:327 [inline]
 ext4_getblk+0x126/0x3e0 fs/ext4/inode.c:854
 ext4_bread_batch+0x60/0x3c0 fs/ext4/inode.c:921
 __ext4_find_entry+0xa96/0x1180 fs/ext4/namei.c:1600
 ext4_lookup_entry fs/ext4/namei.c:1701 [inline]
 ext4_lookup+0xb3/0x3a0 fs/ext4/namei.c:1769
 __lookup_hash+0xbc/0x180 fs/namei.c:1558
 filename_create+0xfc/0x270 fs/namei.c:3655
 do_symlinkat+0x70/0x380 fs/namei.c:4267
 __do_sys_symlink fs/namei.c:4299 [inline]
 __se_sys_symlink fs/namei.c:4297 [inline]
 __x64_sys_symlink+0x52/0x60 fs/namei.c:4297
 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 0xffff888237d281e0 of 8 bytes by task 17213 on cpu 0:
 has_bh_in_lru+0x4e/0x1c0 fs/buffer.c:1415
 smp_call_function_many_cond+0x256/0x660 kernel/smp.c:917
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1424
 kill_bdev block/bdev.c:77 [inline]
 set_blocksize+0x242/0x270 block/bdev.c:158
 sb_set_blocksize+0x2c/0xa0 block/bdev.c:167
 ext4_fill_super+0x2287/0x78f0 fs/ext4/super.c:4333
 mount_bdev+0x1e8/0x290 fs/super.c:1370
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6523
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1500
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11cf/0x1c40 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 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: 0x0000000000000000 -> 0xffff888136484f08

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17213 Comm: syz-executor.2 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.
ext4 filesystem being mounted at /root/syzkaller-testdir768919968/syzkaller.EdClKR/737/file0 supports timestamps until 2038 (0x7fffffff)

Crashes (830):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/26 23:20	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/26 14:08	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/26 02:16	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/24 06:27	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/22 18:59	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/22 00:07	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/21 11:54	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/20 21:50	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/20 11:28	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/19 17:19	upstream	4c388a8e740d	3a9d0024	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/19 00:19	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/18 17:50	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/18 06:53	upstream	42eb8fdac2fc	cafff8b6	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/16 22:03	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/16 10:07	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/15 13:53	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/14 23:01	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/14 12:19	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/13 04:28	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/12 13:36	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/12 05:32	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/11 10:33	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/10 21:48	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/10 05:36	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/09 17:26	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/09 00:43	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/09 00:35	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/08 18:50	upstream	e851dfae4371	d29682f1	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/08 13:08	upstream	6b75d88fa81b	d29682f1	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/08 00:24	upstream	6b75d88fa81b	4c1be0be	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/07 11:43	upstream	b5013d084e03	4c1be0be	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/06 22:53	upstream	512b7931ad05	4c1be0be	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/04 17:31	upstream	7ddb58cb0eca	4c1be0be	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/04 04:23	upstream	ce840177930f	4c1be0be	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/03 15:36	upstream	dcd68326d29b	4c1be0be	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/03 08:07	upstream	56d33754481f	17f3edd2	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/02 18:33	upstream	bfc484fe6abb	17f3edd2	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/02 13:19	upstream	bfc484fe6abb	098b5d53	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/01 23:18	upstream	e66435936756	098b5d53	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/11/01 01:42	upstream	8bb7eca972ad	098b5d53	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/31 12:51	upstream	180eca540ae0	098b5d53	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/30 22:50	upstream	119c85055d86	098b5d53	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/30 01:25	upstream	a379fbbcb88b	098b5d53	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/27 23:30	upstream	1fc596a56b33	be531bb4	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/27 14:06	upstream	d25f27432f80	be531bb4	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/27 06:09	upstream	d25f27432f80	d50eb50a	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/26 14:10	upstream	3906fe9bb7f1	d50eb50a	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/25 20:08	upstream	87066fdd2e30	c1132b49	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/10/25 01:39	upstream	6c62666d8879	4f0000ee	.config	log	report	info	KCSAN: data-race in __find_get_block / has_bh_in_lru
ci2-upstream-kcsan-gce	2021/01/16 23:40	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/02/02 11:07	https://github.com/google/ktsan.git kcsan	245a43005292	2274ad39	.config	log	report
ci2-upstream-kcsan-gce	2020/01/30 02:45	https://github.com/google/ktsan.git kcsan	245a43005292	5ed23f9a	.config	log	report
ci2-upstream-kcsan-gce	2019/10/24 14:58	https://github.com/google/ktsan.git kcsan	05f2236801fe	d01bb02a	.config	log	report