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BUG: KMSAN: uninit-value in handle_tw_list fs/io_uring.c:2330 [inline]
BUG: KMSAN: uninit-value in tctx_task_work+0x1a63/0x21d0 fs/io_uring.c:2362
 handle_tw_list fs/io_uring.c:2330 [inline]
 tctx_task_work+0x1a63/0x21d0 fs/io_uring.c:2362
 task_work_run+0x154/0x290 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:213 [inline]
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop+0x1b5/0x490 kernel/entry/common.c:173
 exit_to_user_mode_prepare kernel/entry/common.c:208 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x7e/0xc0 kernel/entry/common.c:302
 do_syscall_64+0x60/0xd0 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:737 [inline]
 kmem_cache_alloc_bulk+0xec5/0x1560 mm/slub.c:3747
 __io_alloc_req_refill+0x482/0x867 fs/io_uring.c:2072
 io_alloc_req_refill fs/io_uring.c:2098 [inline]
 io_submit_sqes+0x7d4/0x1a00 fs/io_uring.c:7440
 __do_sys_io_uring_enter fs/io_uring.c:10152 [inline]
 __se_sys_io_uring_enter+0x62f/0x23a0 fs/io_uring.c:10094
 __x64_sys_io_uring_enter+0x19d/0x200 fs/io_uring.c:10094
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

CPU: 0 PID: 3903 Comm: syz-executor.2 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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