KCSAN: data-race in fuse_get_req / fuse_set

KCSAN: data-race in fuse_get_req / fuse_set_initialized (2)
Status: auto-closed as invalid on 2021/03/14 23:46
Reported-by: syzbot+9cdf8302f991d9f3379b@syzkaller.appspotmail.com
First crash: 340d, last: 167d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in fuse_get_req / fuse_set_initialized (3)				4	107d	129d	0/22	auto-closed as invalid on 2021/05/14 08:29
upstream	KCSAN: data-race in fuse_get_req / fuse_set_initialized				8	561d	637d	0/22	auto-closed as invalid on 2020/03/20 23:57

Sample crash report:

==================================================================
BUG: KCSAN: data-race in fuse_get_req / fuse_set_initialized

write to 0xffff888012a7b104 of 4 bytes by task 18018 on cpu 0:
 fuse_set_initialized+0x15/0x30 fs/fuse/dev.c:82
 process_init_reply+0xdf/0xbc0 fs/fuse/inode.c:1075
 fuse_request_end+0x78b/0x7c0 fs/fuse/dev.c:332
 fuse_dev_do_write+0xc30/0xe50 fs/fuse/dev.c:1921
 fuse_dev_write+0x98/0xe0 fs/fuse/dev.c:1943
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f0/0x7e0 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888012a7b104 of 4 bytes by task 18015 on cpu 1:
 fuse_block_alloc fs/fuse/dev.c:87 [inline]
 fuse_get_req+0xfd/0x520 fs/fuse/dev.c:115
 fuse_simple_request+0x83/0xde0 fs/fuse/dev.c:504
 fuse_send_open fs/fuse/file.c:60 [inline]
 fuse_do_open+0x240/0x3a0 fs/fuse/file.c:157
 fuse_open_common+0x19f/0x220 fs/fuse/file.c:254
 fuse_dir_open+0x1e/0x30 fs/fuse/dir.c:1387
 do_dentry_open+0x530/0x890 fs/open.c:817
 vfs_open+0x43/0x50 fs/open.c:931
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1847/0x20a0 fs/namei.c:3371
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_openat fs/open.c:1204 [inline]
 __se_sys_openat fs/open.c:1199 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1199
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18015 Comm: syz-executor.0 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (10):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/07 23:45	upstream	b75dba7f472c	2ce644fc	.config	log	report	info	KCSAN: data-race in fuse_get_req / fuse_set_initialized
ci2-upstream-kcsan-gce	2021/01/13 13:06	upstream	e609571b5ffa	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 17:05	upstream	accefff5b547	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/15 04:11	upstream	e28c0d7c92c8	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/17 01:16	upstream	54a4c789ca80	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/10 21:25	upstream	6f2f486d57c4	4a77ae0b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/18 19:05	upstream	10b82d517648	38962c8b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/03 18:16	upstream	e28f0104343d	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/28 18:31	upstream	15bc20c6af4c	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/19 17:40	upstream	18445bf405cb	db787902	.config	log	report