KCSAN: data-race in aio_read_events / iocb

KCSAN: data-race in aio_read_events / iocb_put (2)
Status: auto-closed as invalid on 2021/08/02 19:13
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 112d, last: 112d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in aio_read_events / iocb_put				2	151d	174d	0/22	auto-closed as invalid on 2021/06/24 15:51

Sample crash report:

==================================================================
BUG: KCSAN: data-race in aio_read_events / iocb_put

write to 0xffff8881464dc00c of 4 bytes by task 15825 on cpu 1:
 aio_complete fs/aio.c:1129 [inline]
 iocb_put+0x1e1/0x5b0 fs/aio.c:1163
 io_submit_one+0x83d/0x1350 fs/aio.c:1883
 __do_sys_io_submit fs/aio.c:1939 [inline]
 __se_sys_io_submit+0xf5/0x260 fs/aio.c:1909
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1909
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881464dc00c of 4 bytes by task 15824 on cpu 0:
 aio_read_events_ring fs/aio.c:1192 [inline]
 aio_read_events+0xc6/0x470 fs/aio.c:1255
 read_events fs/aio.c:1292 [inline]
 do_io_getevents+0x1e6/0x360 fs/aio.c:2058
 __do_sys_io_getevents fs/aio.c:2091 [inline]
 __se_sys_io_getevents fs/aio.c:2079 [inline]
 __x64_sys_io_getevents+0xb7/0x170 fs/aio.c:2079
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15824 Comm: syz-executor.2 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci2-upstream-kcsan-gce	2021/06/28 19:06	upstream	62fb9874f5da	9d2ab5df	.config	log	report			info	KCSAN: data-race in aio_read_events / iocb_put