exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0xf794f3fa, utbl_chksum : 0xe619d30d)
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BUG: KMSAN: uninit-value in iov_iter_alignment_iovec+0x1a8/0x470 lib/iov_iter.c:894
 iov_iter_alignment_iovec+0x1a8/0x470 lib/iov_iter.c:894
 iov_iter_alignment+0x1ac/0x2d0 lib/iov_iter.c:939
 __blockdev_direct_IO+0x170/0x6460 fs/direct-io.c:1121
 blockdev_direct_IO include/linux/fs.h:3313 [inline]
 exfat_direct_IO+0x191/0x900 fs/exfat/inode.c:482
 generic_file_direct_write+0x275/0x6a0 mm/filemap.c:3979
 __generic_file_write_iter+0x242/0x460 mm/filemap.c:4143
 exfat_file_write_iter+0x894/0xfb0 fs/exfat/file.c:598
 io_write+0xd5a/0x2360 io_uring/rw.c:1082
 io_issue_sqe+0x420/0x2130 io_uring/io_uring.c:1712
 io_queue_sqe io_uring/io_uring.c:1922 [inline]
 io_submit_sqe io_uring/io_uring.c:2177 [inline]
 io_submit_sqes+0x11bc/0x2f80 io_uring/io_uring.c:2294
 __do_sys_io_uring_enter io_uring/io_uring.c:3364 [inline]
 __se_sys_io_uring_enter+0x423/0x4b10 io_uring/io_uring.c:3299
 __x64_sys_io_uring_enter+0x11f/0x1a0 io_uring/io_uring.c:3299
 x64_sys_call+0xce5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4091 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 __do_kmalloc_node mm/slub.c:4263 [inline]
 __kmalloc_noprof+0x661/0xf30 mm/slub.c:4276
 kmalloc_noprof include/linux/slab.h:883 [inline]
 io_alloc_async_data+0xc0/0x220 io_uring/io_uring.c:1623
 io_rw_alloc_async io_uring/rw.c:228 [inline]
 io_prep_rw_setup io_uring/rw.c:245 [inline]
 io_prep_rw+0x921/0xcd0 io_uring/rw.c:286
 io_prep_rwv+0xb3/0x510 io_uring/rw.c:305
 io_prep_writev+0x3a/0x50 io_uring/rw.c:325
 io_init_req io_uring/io_uring.c:2092 [inline]
 io_submit_sqe io_uring/io_uring.c:2139 [inline]
 io_submit_sqes+0x1082/0x2f80 io_uring/io_uring.c:2294
 __do_sys_io_uring_enter io_uring/io_uring.c:3364 [inline]
 __se_sys_io_uring_enter+0x423/0x4b10 io_uring/io_uring.c:3299
 __x64_sys_io_uring_enter+0x11f/0x1a0 io_uring/io_uring.c:3299
 x64_sys_call+0xce5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 22627 Comm: syz.0.4909 Tainted: G        W          6.12.0-syzkaller-01518-ga5c93bfec0be #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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