syzbot

=====================================================
BUG: KMSAN: uninit-value in batch_add_pfn_num drivers/iommu/iommufd/pages.c:365 [inline]
BUG: KMSAN: uninit-value in batch_add_pfn drivers/iommu/iommufd/pages.c:398 [inline]
BUG: KMSAN: uninit-value in batch_from_xarray_clear drivers/iommu/iommufd/pages.c:590 [inline]
BUG: KMSAN: uninit-value in iopt_pages_unpin_xarray drivers/iommu/iommufd/pages.c:2030 [inline]
BUG: KMSAN: uninit-value in iopt_pages_unfill_xarray+0xfe3/0x1660 drivers/iommu/iommufd/pages.c:2068
 batch_add_pfn_num drivers/iommu/iommufd/pages.c:365 [inline]
 batch_add_pfn drivers/iommu/iommufd/pages.c:398 [inline]
 batch_from_xarray_clear drivers/iommu/iommufd/pages.c:590 [inline]
 iopt_pages_unpin_xarray drivers/iommu/iommufd/pages.c:2030 [inline]
 iopt_pages_unfill_xarray+0xfe3/0x1660 drivers/iommu/iommufd/pages.c:2068
 iopt_area_remove_access+0x508/0x650 drivers/iommu/iommufd/pages.c:2516
 iommufd_access_unpin_pages+0x637/0xa50 drivers/iommu/iommufd/device.c:1358
 iommufd_test_access_unmap+0x423/0x6b0 drivers/iommu/iommufd/selftest.c:1384
 iommufd_test_staccess_release+0x7f/0x140 drivers/iommu/iommufd/selftest.c:1425
 __fput+0x60e/0x1050 fs/file_table.c:468
 ____fput+0x25/0x30 fs/file_table.c:496
 task_work_run+0x208/0x2b0 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0x2ff/0x1b20 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x1d7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable batch created at:
 iopt_pages_unfill_xarray+0x86/0x1660 drivers/iommu/iommufd/pages.c:2053
 iopt_area_remove_access+0x508/0x650 drivers/iommu/iommufd/pages.c:2516

CPU: 0 UID: 0 PID: 6001 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
=====================================================