syzbot

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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff888107cb6870 of 4 bytes by task 5851 on cpu 0:
 io_get_sqe io_uring/io_uring.c:2067 [inline]
 io_submit_sqes+0x1f1/0x530 io_uring/io_uring.c:2113
 __do_sys_io_uring_enter io_uring/io_uring.c:3054 [inline]
 __se_sys_io_uring_enter+0x254/0xa50 io_uring/io_uring.c:2984
 __x64_sys_io_uring_enter+0x74/0x80 io_uring/io_uring.c:2984
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888107cb6870 of 4 bytes by task 5835 on cpu 1:
 io_sqring_full io_uring/io_uring.h:213 [inline]
 io_uring_poll+0x8d/0x150 io_uring/io_uring.c:2495
 vfs_poll include/linux/poll.h:88 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0x6d5/0xca0 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x195/0x1d0 fs/select.c:1101
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1101
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000006d -> 0x00000071

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5835 Comm: syz-executor.4 Not tainted 6.0.0-rc2-syzkaller-00248-ge022620b5d05-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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