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BUG: KCSAN: data-race in io_flush_timeouts / io_issue_sqe

read-write to 0xffff88811955ea10 of 4 bytes by task 24327 on cpu 1:
 io_get_cqe_overflow io_uring/io_uring.h:181 [inline]
 io_get_cqe io_uring/io_uring.h:190 [inline]
 io_fill_cqe_req io_uring/io_uring.h:212 [inline]
 io_req_complete_post io_uring/io_uring.c:967 [inline]
 io_issue_sqe+0x19c/0x970 io_uring/io_uring.c:1802
 io_wq_submit_work+0x3f7/0x5f0 io_uring/io_uring.c:1908
 io_worker_handle_work+0x44e/0x9b0 io_uring/io-wq.c:642
 io_wq_worker+0x22e/0x870 io_uring/io-wq.c:696
 ret_from_fork+0xdd/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff88811955ea10 of 4 bytes by task 24326 on cpu 0:
 io_flush_timeouts+0x56/0x1d0 io_uring/timeout.c:132
 __io_commit_cqring_flush+0xeb/0x100 io_uring/io_uring.c:560
 io_commit_cqring_flush io_uring/io_uring.h:422 [inline]
 __io_cq_unlock_post io_uring/io_uring.c:587 [inline]
 __io_submit_flush_completions+0x9e3/0xa00 io_uring/io_uring.c:1515
 io_submit_flush_completions io_uring/io_uring.h:164 [inline]
 ctx_flush_and_put+0x9b/0x150 io_uring/io_uring.c:1074
 io_handle_tw_list+0x1a9/0x1c0 io_uring/io_uring.c:1114
 tctx_task_work_run+0x6d/0x1a0 io_uring/io_uring.c:1167
 tctx_task_work+0x3f/0x80 io_uring/io_uring.c:1185
 task_work_run+0x12e/0x1a0 kernel/task_work.c:227
 get_signal+0xe13/0xf70 kernel/signal.c:2807
 arch_do_signal_or_restart+0x96/0x480 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x7a/0x100 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000531 -> 0x00000532

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 24326 Comm: syz.2.6362 Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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