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BUG: KMSAN: uninit-value in iov_iter_alignment_iovec+0x19e/0x470 lib/iov_iter.c:808
 iov_iter_alignment_iovec+0x19e/0x470 lib/iov_iter.c:808
 iov_iter_alignment+0x174/0x2d0 lib/iov_iter.c:853
 ntfs_file_read_iter+0x5b5/0x780 fs/ntfs3/file.c:948
 io_iter_do_read io_uring/rw.c:827 [inline]
 __io_read+0xbf9/0x24b0 io_uring/rw.c:943
 io_read+0x6b/0x3c0 io_uring/rw.c:1023
 __io_issue_sqe+0x2bb/0x790 io_uring/io_uring.c:1792
 io_issue_sqe+0xae/0x1d00 io_uring/io_uring.c:1815
 io_wq_submit_work+0xa18/0xef0 io_uring/io_uring.c:1927
 io_worker_handle_work+0xc7a/0x2090 io_uring/io-wq.c:650
 io_wq_worker+0x36e/0x13f0 io_uring/io-wq.c:704
 ret_from_fork+0x208/0x710 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4960 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 __do_kmalloc_node mm/slub.c:5656 [inline]
 __kmalloc_noprof+0xaf2/0x1c20 mm/slub.c:5669
 kmalloc_noprof include/linux/slab.h:961 [inline]
 io_cache_alloc_new+0x55/0x140 io_uring/alloc_cache.c:40
 io_cache_alloc io_uring/alloc_cache.h:59 [inline]
 io_uring_alloc_async_data io_uring/io_uring.h:342 [inline]
 io_rw_alloc_async io_uring/rw.c:202 [inline]
 __io_prep_rw+0x1cd/0x1330 io_uring/rw.c:261
 io_prep_rw io_uring/rw.c:321 [inline]
 io_prep_rwv+0x43/0x5a0 io_uring/rw.c:343
 io_prep_readv+0x38/0x50 io_uring/rw.c:358
 io_init_req io_uring/io_uring.c:2234 [inline]
 io_submit_sqe io_uring/io_uring.c:2281 [inline]
 io_submit_sqes+0x14f2/0x3270 io_uring/io_uring.c:2434
 __do_sys_io_uring_enter io_uring/io_uring.c:3277 [inline]
 __se_sys_io_uring_enter+0x3b4/0x4bb0 io_uring/io_uring.c:3216
 __ia32_sys_io_uring_enter+0x112/0x1a0 io_uring/io_uring.c:3216
 ia32_sys_call+0x317e/0x4340 arch/x86/include/generated/asm/syscalls_32.h:427
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x155/0x310 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 8162 Comm: iou-wrk-8150 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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