=====================================================
BUG: KMSAN: uninit-value in crc32_be_base lib/crc/crc32-main.c:46 [inline]
BUG: KMSAN: uninit-value in crc32_be+0x215/0x270 lib/crc/crc32-main.c:80
 crc32_be_base lib/crc/crc32-main.c:46 [inline]
 crc32_be+0x215/0x270 lib/crc/crc32-main.c:80
 sw842_compress+0x45db/0x4fa0 lib/842/842_compress.c:584
 crypto842_scompress+0x4e/0x70 crypto/842.c:46
 scomp_acomp_comp_decomp+0xa46/0x1120 include/crypto/internal/scompress.h:-1
 scomp_acomp_compress+0x33/0x40 crypto/scompress.c:282
 crypto_acomp_compress+0x5b1/0xe80 crypto/acompress.c:291
 zswap_compress mm/zswap.c:886 [inline]
 zswap_store_page mm/zswap.c:1429 [inline]
 zswap_store+0x1ea0/0x4bb0 mm/zswap.c:1540
 swap_writeout+0x8c1/0x1390 mm/page_io.c:275
 shmem_writeout+0x1ac6/0x1f70 mm/shmem.c:1643
 writeout mm/vmscan.c:660 [inline]
 pageout mm/vmscan.c:721 [inline]
 shrink_folio_list+0x56ca/0x7e30 mm/vmscan.c:1453
 evict_folios+0x9a43/0xc010 mm/vmscan.c:4745
 try_to_shrink_lruvec+0x12b6/0x17e0 mm/vmscan.c:4908
 shrink_one+0x6b5/0xe10 mm/vmscan.c:4953
 shrink_many mm/vmscan.c:5016 [inline]
 lru_gen_shrink_node mm/vmscan.c:5094 [inline]
 shrink_node+0x481a/0x54a0 mm/vmscan.c:6081
 kswapd_shrink_node mm/vmscan.c:6941 [inline]
 balance_pgdat mm/vmscan.c:7124 [inline]
 kswapd+0x2b99/0x4ce0 mm/vmscan.c:7389
 kthread+0xd59/0xf00 kernel/kthread.c:463
 ret_from_fork+0x233/0x380 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:
 memcpy_from_iter lib/iov_iter.c:73 [inline]
 iterate_bvec include/linux/iov_iter.h:123 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:306 [inline]
 iterate_and_advance include/linux/iov_iter.h:330 [inline]
 __copy_from_iter lib/iov_iter.c:249 [inline]
 copy_folio_from_iter_atomic+0x11f7/0x3c20 lib/iov_iter.c:479
 generic_perform_write+0x8b1/0x1050 mm/filemap.c:4242
 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3464
 lo_rw_aio+0x1265/0x1590 drivers/block/loop.c:-1
 do_req_filebacked drivers/block/loop.c:-1 [inline]
 loop_handle_cmd drivers/block/loop.c:1919 [inline]
 loop_process_work+0xe30/0x1ec0 drivers/block/loop.c:1954
 loop_workfn+0x3e/0x60 drivers/block/loop.c:1978
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3346
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427
 kthread+0xd59/0xf00 kernel/kthread.c:463
 ret_from_fork+0x233/0x380 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5245 [inline]
 kmem_cache_alloc_noprof+0x8f5/0x1640 mm/slub.c:5252
 ntfs_create_inode+0x603/0x56e0 fs/ntfs3/inode.c:1280
 ntfs_create+0x56/0x70 fs/ntfs3/namei.c:110
 lookup_open fs/namei.c:3796 [inline]
 open_last_lookups fs/namei.c:3895 [inline]
 path_openat+0x2d47/0x6760 fs/namei.c:4131
 do_filp_open+0x280/0x660 fs/namei.c:4161
 do_sys_openat2+0x1bb/0x2f0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_compat_sys_openat fs/open.c:1514 [inline]
 __se_compat_sys_openat fs/open.c:1512 [inline]
 __ia32_compat_sys_openat+0x238/0x300 fs/open.c:1512
 ia32_sys_call+0x3210/0x4310 arch/x86/include/generated/asm/syscalls_32.h:296
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 1 UID: 0 PID: 78 Comm: kswapd0 Tainted: G        W           syzkaller #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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