=====================================================
BUG: KMSAN: uninit-value in io_fallback_req_func+0x226/0x660 fs/io_uring.c:1254
 io_fallback_req_func+0x226/0x660 fs/io_uring.c:1254
 process_one_work+0xdc7/0x1760 kernel/workqueue.c:2297
 worker_thread+0x1101/0x22b0 kernel/workqueue.c:2444
 kthread+0x66b/0x780 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

Uninit was created at:
 kmem_cache_alloc_bulk+0x1000/0x1390 mm/slub.c:3726
 io_alloc_req fs/io_uring.c:1933 [inline]
 io_submit_sqes+0x11ea/0x2ad0 fs/io_uring.c:7277
 __do_sys_io_uring_enter fs/io_uring.c:9992 [inline]
 __se_sys_io_uring_enter+0x62b/0x23b0 fs/io_uring.c:9934
 __x64_sys_io_uring_enter+0x19d/0x200 fs/io_uring.c:9934
 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
=====================================================