syzbot

=====================================================
BUG: KMSAN: uninit-value in xas_start lib/xarray.c:193 [inline]
BUG: KMSAN: uninit-value in xas_load+0xd20/0xd70 lib/xarray.c:239
 xas_start lib/xarray.c:193 [inline]
 xas_load+0xd20/0xd70 lib/xarray.c:239
 xas_find+0x2c8/0xd40 lib/xarray.c:1406
 xa_find+0x15a/0x2a0 lib/xarray.c:2194
 io_unregister_zcrx_ifqs+0x75/0x1d0 io_uring/zcrx.c:640
 io_ring_ctx_free+0x61/0x740 io_uring/io_uring.c:2723
 io_ring_exit_work+0xdec/0xe20 io_uring/io_uring.c:2963
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd59/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was stored to memory at:
 xa_find+0x26c/0x2a0 lib/xarray.c:2186
 io_unregister_zcrx_ifqs+0x75/0x1d0 io_uring/zcrx.c:640
 io_ring_ctx_free+0x61/0x740 io_uring/io_uring.c:2723
 io_ring_exit_work+0xdec/0xe20 io_uring/io_uring.c:2963
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402
 kthread+0xd59/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Local variable id created at:
 io_unregister_zcrx_ifqs+0x3d/0x1d0 io_uring/zcrx.c:634
 io_ring_ctx_free+0x61/0x740 io_uring/io_uring.c:2723

CPU: 1 UID: 0 PID: 4156 Comm: kworker/u8:25 Not tainted 6.15.0-syzkaller-08486-gf66bc387efbe #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: iou_exit io_ring_exit_work
=====================================================