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BUG: KMSAN: uninit-value in io_msg_ring+0x643/0xce0 io_uring/msg_ring.c:148
 io_msg_ring+0x643/0xce0 io_uring/msg_ring.c:148
 io_issue_sqe+0x2f4/0x11d0 io_uring/io_uring.c:1577
 io_queue_sqe io_uring/io_uring.c:1755 [inline]
 io_req_task_submit+0x139/0x280 io_uring/io_uring.c:1104
 handle_tw_list+0x2fa/0x4a0 io_uring/io_uring.c:984
 tctx_task_work+0xea/0x420 io_uring/io_uring.c:1031
 task_work_run+0x13c/0x280 kernel/task_work.c:177
 get_signal+0x152/0x2c50 kernel/signal.c:2634
 arch_do_signal_or_restart+0x56/0xae0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0xea/0x320 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x16e/0x220 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x23/0x40 kernel/entry/common.c:296
 __do_fast_syscall_32+0xb1/0x100 arch/x86/entry/common.c:181
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:732 [inline]
 kmem_cache_alloc_bulk+0xb53/0x1070 mm/slub.c:3750
 __io_alloc_req_refill+0x255/0x784 io_uring/io_uring.c:877
 io_alloc_req_refill io_uring/io_uring.h:292 [inline]
 io_submit_sqes+0x5e8/0xd50 io_uring/io_uring.c:2111
 __do_sys_io_uring_enter io_uring/io_uring.c:3054 [inline]
 __se_sys_io_uring_enter+0x597/0x1d30 io_uring/io_uring.c:2984
 __ia32_sys_io_uring_enter+0x115/0x190 io_uring/io_uring.c:2984
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 1 PID: 4921 Comm: syz-executor.4 Not tainted 6.0.0-rc5-syzkaller-48543-g968c2729e576 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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