syzbot

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BUG: KCSAN: data-race in __se_sys_io_uring_enter / io_submit_sqes

write to 0xffff8881438eb004 of 2 bytes by task 27617 on cpu 1:
 io_init_req io_uring/io_uring.c:1770 [inline]
 io_submit_sqe io_uring/io_uring.c:1875 [inline]
 io_submit_sqes+0xca3/0x1270 io_uring/io_uring.c:2043
 __io_sq_thread io_uring/sqpoll.c:233 [inline]
 io_sq_thread+0x7f9/0x1310 io_uring/sqpoll.c:345
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff8881438eb004 of 2 bytes by task 27620 on cpu 0:
 __do_sys_io_uring_enter io_uring/io_uring.c:2624 [inline]
 __se_sys_io_uring_enter+0x2e4/0xf50 io_uring/io_uring.c:2538
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:2538
 x64_sys_call+0x1e16/0x3020 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0200 -> 0x0608

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 27620 Comm: syz.7.7213 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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