=====================================================
BUG: KMSAN: uninit-value in io_fixup_rw_res io_uring/rw.c:277 [inline]
BUG: KMSAN: uninit-value in io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:997
 io_fixup_rw_res io_uring/rw.c:277 [inline]
 io_rw_fail+0x1a7/0x1b0 io_uring/rw.c:997
 io_req_defer_failed+0x217/0x3e0 io_uring/io_uring.c:1051
 io_queue_sqe_fallback+0x1f4/0x260 io_uring/io_uring.c:2077
 io_submit_state_end io_uring/io_uring.c:2322 [inline]
 io_submit_sqes+0x2ac6/0x2dc0 io_uring/io_uring.c:2435
 __do_sys_io_uring_enter io_uring/io_uring.c:3628 [inline]
 __se_sys_io_uring_enter+0x49b/0x4250 io_uring/io_uring.c:3562
 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3562
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
 slab_alloc_node mm/slub.c:3470 [inline]
 __kmem_cache_alloc_node+0x536/0x8d0 mm/slub.c:3509
 __do_kmalloc_node mm/slab_common.c:984 [inline]
 __kmalloc+0x121/0x3c0 mm/slab_common.c:998
 kmalloc include/linux/slab.h:586 [inline]
 io_alloc_async_data io_uring/io_uring.c:1759 [inline]
 io_req_prep_async+0x384/0x5a0 io_uring/io_uring.c:1780
 io_queue_sqe_fallback+0x95/0x260 io_uring/io_uring.c:2074
 io_submit_state_end io_uring/io_uring.c:2322 [inline]
 io_submit_sqes+0x2ac6/0x2dc0 io_uring/io_uring.c:2435
 __do_sys_io_uring_enter io_uring/io_uring.c:3628 [inline]
 __se_sys_io_uring_enter+0x49b/0x4250 io_uring/io_uring.c:3562
 __x64_sys_io_uring_enter+0x11b/0x1a0 io_uring/io_uring.c:3562
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CPU: 0 PID: 11601 Comm: syz-executor.0 Not tainted 6.5.0-rc7-syzkaller-00104-g4f9e7fabf864 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
=====================================================