syzbot

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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_decompress+0x15c6/0x1780 lib/842/842_decompress.c:385
 crypto842_sdecompress+0x46/0x60 crypto/842.c:53
 scomp_acomp_comp_decomp+0xa46/0x1120 include/crypto/internal/scompress.h:-1
 scomp_acomp_decompress+0x30/0x40 crypto/scompress.c:287
 crypto_acomp_decompress+0x5b1/0xe80 crypto/acompress.c:303
 zswap_decompress+0x729/0x1000 mm/zswap.c:968
 zswap_load+0x262/0x570 mm/zswap.c:1628
 swap_read_folio+0x662/0x3050 mm/page_io.c:637
 swap_cluster_readahead+0xa8c/0xb20 mm/swap_state.c:672
 swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:813
 do_swap_page+0xce9/0x9c40 mm/memory.c:4713
 handle_pte_fault mm/memory.c:6180 [inline]
 __handle_mm_fault mm/memory.c:6318 [inline]
 handle_mm_fault+0x4100/0xded0 mm/memory.c:6487
 do_user_addr_fault+0x1777/0x2550 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x68/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2435
 __read_swap_cache_async+0x1f9/0x770 mm/swap_state.c:440
 swap_cluster_readahead+0xa0d/0xb20 mm/swap_state.c:669
 swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:813
 do_swap_page+0xce9/0x9c40 mm/memory.c:4713
 handle_pte_fault mm/memory.c:6180 [inline]
 __handle_mm_fault mm/memory.c:6318 [inline]
 handle_mm_fault+0x4100/0xded0 mm/memory.c:6487
 do_user_addr_fault+0x1777/0x2550 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x68/0xb0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623

CPU: 0 UID: 0 PID: 5137 Comm: udevd Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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