syzbot

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BUG: KMSAN: uninit-value in crc32_be_base+0x215/0x270 lib/crc32.c:123
 crc32_be_base+0x215/0x270 lib/crc32.c:123
 crc32_be_arch+0x3f/0x50 arch/x86/lib/crc32.c:77
 crc32_be include/linux/crc32.h:25 [inline]
 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+0x510/0xea0 mm/zswap.c:1032
 zswap_load+0x262/0x570 mm/zswap.c:1692
 swap_read_folio+0x6ac/0x3010 mm/page_io.c:642
 swap_cluster_readahead+0xa82/0xb20 mm/swap_state.c:635
 swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:811
 do_swap_page+0xa39/0x9df0 mm/memory.c:4603
 handle_pte_fault mm/memory.c:6072 [inline]
 __handle_mm_fault mm/memory.c:6212 [inline]
 handle_mm_fault+0x4276/0xe5e0 mm/memory.c:6381
 do_user_addr_fault+0x177d/0x2560 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:4982
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2419
 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2438
 __read_swap_cache_async+0x2a7/0x980 mm/swap_state.c:400
 swap_cluster_readahead+0x9ff/0xb20 mm/swap_state.c:632
 swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:811
 do_swap_page+0xa39/0x9df0 mm/memory.c:4603
 handle_pte_fault mm/memory.c:6072 [inline]
 __handle_mm_fault mm/memory.c:6212 [inline]
 handle_mm_fault+0x4276/0xe5e0 mm/memory.c:6381
 do_user_addr_fault+0x177d/0x2560 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: 1 UID: 0 PID: 5785 Comm: syz-executor Tainted: G        W           6.16.0-rc5-syzkaller-00276-g5d5d62298b8b #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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