KCSAN: data-race in io_submit_sqes / io_uring

KCSAN: data-race in io_submit_sqes / io_uring_poll (2)
Status: auto-closed as invalid on 2021/02/08 06:39
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 201d, last: 201d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in io_submit_sqes / io_uring_poll				2	302d	328d	0/22	auto-closed as invalid on 2020/10/29 16:22

Sample crash report:

==================================================================
BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff88801bdc3c50 of 4 bytes by task 12385 on cpu 1:
 io_consume_sqe fs/io_uring.c:6708 [inline]
 io_submit_sqes+0x3f5/0x1250 fs/io_uring.c:6861
 __do_sys_io_uring_enter fs/io_uring.c:9214 [inline]
 __se_sys_io_uring_enter+0x22a/0xad0 fs/io_uring.c:9158
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9158
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88801bdc3c50 of 4 bytes by task 12376 on cpu 0:
 io_sqring_full fs/io_uring.c:1668 [inline]
 io_uring_poll+0x92/0x160 fs/io_uring.c:8625
 vfs_poll include/linux/poll.h:90 [inline]
 __io_arm_poll_handler+0x18f/0x400 fs/io_uring.c:5347
 io_poll_add fs/io_uring.c:5599 [inline]
 io_issue_sqe+0x7e0/0x3f20 fs/io_uring.c:6200
 __io_queue_sqe+0x20e/0x7a0 fs/io_uring.c:6488
 io_queue_sqe+0x1bf/0x2b0 fs/io_uring.c:6554
 io_submit_sqe+0x2fd/0x5b0 fs/io_uring.c:6627
 io_submit_sqes+0xa66/0x1250 fs/io_uring.c:6875
 __do_sys_io_uring_enter fs/io_uring.c:9214 [inline]
 __se_sys_io_uring_enter+0x22a/0xad0 fs/io_uring.c:9158
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9158
 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: 0 PID: 12376 Comm: syz-executor.2 Not tainted 5.11.0-rc2-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	2021/01/04 06:30	upstream	e71ba9452f0b	79264ae3	.config	log	report			info