=====================================================
BUG: KMSAN: uninit-value in crc32_be_base lib/crc/crc32-main.c:46 [inline]
BUG: KMSAN: uninit-value in crc32_be+0x228/0x270 lib/crc/crc32-main.c:80
 crc32_be_base lib/crc/crc32-main.c:46 [inline]
 crc32_be+0x228/0x270 lib/crc/crc32-main.c:80
 sw842_compress+0x45f8/0x5060 lib/842/842_compress.c:584
 crypto842_scompress+0x4e/0x70 crypto/842.c:46
 scomp_acomp_comp_decomp+0xa49/0x1120 include/crypto/internal/scompress.h:-1
 scomp_acomp_compress+0x33/0x40 crypto/scompress.c:282
 crypto_acomp_compress+0x5b4/0xe80 crypto/acompress.c:291
 zswap_compress mm/zswap.c:886 [inline]
 zswap_store_page mm/zswap.c:1428 [inline]
 zswap_store+0x1a23/0x4b20 mm/zswap.c:1539
 swap_writeout+0x8bd/0x1380 mm/page_io.c:275
 shmem_writeout+0x1ac0/0x1f50 mm/shmem.c:1662
 writeout mm/vmscan.c:649 [inline]
 pageout mm/vmscan.c:698 [inline]
 shrink_folio_list+0x5951/0x7fd0 mm/vmscan.c:1418
 evict_folios+0x9aa3/0xc030 mm/vmscan.c:4711
 try_to_shrink_lruvec+0x1251/0x1750 mm/vmscan.c:4874
 lru_gen_shrink_lruvec mm/vmscan.c:5023 [inline]
 shrink_lruvec+0x505/0x4d80 mm/vmscan.c:5784
 shrink_node_memcgs mm/vmscan.c:6020 [inline]
 shrink_node+0xf09/0x51a0 mm/vmscan.c:6061
 shrink_zones mm/vmscan.c:6300 [inline]
 do_try_to_free_pages+0x956/0x26c0 mm/vmscan.c:6362
 try_to_free_mem_cgroup_pages+0x3ad/0x950 mm/vmscan.c:6690
 try_charge_memcg+0x80b/0x1c20 mm/memcontrol.c:2388
 obj_cgroup_charge_pages+0x69/0x330 mm/memcontrol.c:2823
 __memcg_kmem_charge_page+0x149/0x4c0 mm/memcontrol.c:2867
 __alloc_frozen_pages_noprof+0x680/0xf50 mm/page_alloc.c:5257
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0x101/0x280 mm/mempolicy.c:2577
 io_mem_alloc_compound io_uring/memmap.c:30 [inline]
 io_region_allocate_pages+0x164/0x8f0 io_uring/memmap.c:165
 io_create_region+0x6d0/0x830 io_uring/memmap.c:220
 io_allocate_scq_urings+0x1e3/0x8a0 io_uring/io_uring.c:3384
 io_uring_create+0x7a9/0x1020 io_uring/io_uring.c:3648
 io_uring_setup io_uring/io_uring.c:3723 [inline]
 __do_sys_io_uring_setup io_uring/io_uring.c:3757 [inline]
 __se_sys_io_uring_setup+0x3f0/0x410 io_uring/io_uring.c:3748
 __x64_sys_io_uring_setup+0x78/0xb0 io_uring/io_uring.c:3748
 x64_sys_call+0x2be4/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:426
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_frozen_pages_noprof+0x6df/0xf50 mm/page_alloc.c:5263
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486
 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2505
 shmem_alloc_folio mm/shmem.c:1890 [inline]
 shmem_alloc_and_add_folio+0xc54/0x1bd0 mm/shmem.c:1932
 shmem_get_folio_gfp+0xad3/0x1fc0 mm/shmem.c:2556
 shmem_get_folio mm/shmem.c:2662 [inline]
 shmem_symlink+0x562/0xad0 mm/shmem.c:4129
 vfs_symlink+0x8ea/0x9b0 fs/namei.c:5523
 do_symlinkat+0x2c6/0xbc0 fs/namei.c:5550
 __do_sys_symlinkat fs/namei.c:5571 [inline]
 __se_sys_symlinkat fs/namei.c:5568 [inline]
 __x64_sys_symlinkat+0xf5/0x180 fs/namei.c:5568
 x64_sys_call+0x342f/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 13649 Comm: syz.1.1537 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
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