syzbot

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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff888114970870 of 4 bytes by task 13361 on cpu 1:
 io_get_sqe io_uring/io_uring.c:2235 [inline]
 io_submit_sqes+0x23f/0x1080 io_uring/io_uring.c:2286
 __do_sys_io_uring_enter io_uring/io_uring.c:3210 [inline]
 __se_sys_io_uring_enter+0x1c6/0x15a0 io_uring/io_uring.c:3147
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3147
 x64_sys_call+0x2567/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888114970870 of 4 bytes by task 13362 on cpu 0:
 io_sqring_full io_uring/io_uring.h:282 [inline]
 io_uring_poll+0xcf/0x190 io_uring/io_uring.c:2701
 vfs_poll include/linux/poll.h:84 [inline]
 __io_arm_poll_handler+0x229/0xf30 io_uring/poll.c:623
 io_arm_poll_handler+0x433/0x5f0 io_uring/poll.c:757
 io_wq_submit_work+0x512/0x600 io_uring/io_uring.c:1844
 io_worker_handle_work+0x486/0x9d0 io_uring/io-wq.c:600
 io_wq_worker+0x286/0x820 io_uring/io-wq.c:654
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x00003f3f -> 0x00003f40

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13362 Comm: iou-wrk-13361 Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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