===================================================== BUG: KMSAN: uninit-value in sw842_decompress+0x11f3/0x1780 lib/842/842_decompress.c:303 sw842_decompress+0x11f3/0x1780 lib/842/842_decompress.c:303 crypto842_sdecompress+0x46/0x60 crypto/842.c:53 scomp_acomp_comp_decomp+0xa49/0x1120 include/crypto/internal/scompress.h:-1 scomp_acomp_decompress+0x30/0x40 crypto/scompress.c:287 crypto_acomp_decompress+0x5b4/0xe80 crypto/acompress.c:303 zswap_decompress+0x729/0x1000 mm/zswap.c:967 zswap_load+0x262/0x570 mm/zswap.c:1627 swap_read_folio+0x662/0x3050 mm/page_io.c:637 swap_cluster_readahead+0xa8c/0xb20 mm/swap_state.c:668 swapin_readahead+0x217/0x1990 mm/swap_state.c:821 do_swap_page+0x984/0x99b0 mm/memory.c:4753 handle_pte_fault mm/memory.c:6276 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x3034/0x6ee0 mm/memory.c:6580 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+0x74/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618 Uninit was stored to memory at: sw842_decompress+0x11ec/0x1780 lib/842/842_decompress.c:303 crypto842_sdecompress+0x46/0x60 crypto/842.c:53 scomp_acomp_comp_decomp+0xa49/0x1120 include/crypto/internal/scompress.h:-1 scomp_acomp_decompress+0x30/0x40 crypto/scompress.c:287 crypto_acomp_decompress+0x5b4/0xe80 crypto/acompress.c:303 zswap_decompress+0x729/0x1000 mm/zswap.c:967 zswap_load+0x262/0x570 mm/zswap.c:1627 swap_read_folio+0x662/0x3050 mm/page_io.c:637 swap_cluster_readahead+0xa8c/0xb20 mm/swap_state.c:668 swapin_readahead+0x217/0x1990 mm/swap_state.c:821 do_swap_page+0x984/0x99b0 mm/memory.c:4753 handle_pte_fault mm/memory.c:6276 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x3034/0x6ee0 mm/memory.c:6580 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+0x74/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618 Uninit was stored to memory at: next_bits+0xac2/0xda0 lib/842/842_decompress.c:118 sw842_decompress+0x1a6/0x1780 lib/842/842_decompress.c:297 crypto842_sdecompress+0x46/0x60 crypto/842.c:53 scomp_acomp_comp_decomp+0xa49/0x1120 include/crypto/internal/scompress.h:-1 scomp_acomp_decompress+0x30/0x40 crypto/scompress.c:287 crypto_acomp_decompress+0x5b4/0xe80 crypto/acompress.c:303 zswap_decompress+0x729/0x1000 mm/zswap.c:967 zswap_load+0x262/0x570 mm/zswap.c:1627 swap_read_folio+0x662/0x3050 mm/page_io.c:637 swap_cluster_readahead+0xa8c/0xb20 mm/swap_state.c:668 swapin_readahead+0x217/0x1990 mm/swap_state.c:821 do_swap_page+0x984/0x99b0 mm/memory.c:4753 handle_pte_fault mm/memory.c:6276 [inline] __handle_mm_fault mm/memory.c:6411 [inline] handle_mm_fault+0x3034/0x6ee0 mm/memory.c:6580 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+0x74/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618 Uninit was created at: __alloc_frozen_pages_noprof+0x421/0xab0 mm/page_alloc.c:5233 __alloc_pages_noprof+0x41/0xd0 mm/page_alloc.c:5244 __alloc_pages_node_noprof include/linux/gfp.h:285 [inline] alloc_pages_node_noprof include/linux/gfp.h:312 [inline] alloc_zpdesc mm/zsmalloc.c:237 [inline] alloc_zspage+0x394/0x19f0 mm/zsmalloc.c:984 zs_malloc+0x79d/0x1250 mm/zsmalloc.c:1300 zswap_compress mm/zswap.c:909 [inline] zswap_store_page mm/zswap.c:1428 [inline] zswap_store+0x24a0/0x4a90 mm/zswap.c:1539 swap_writeout+0x8c1/0x1390 mm/page_io.c:275 writeout mm/vmscan.c:651 [inline] pageout mm/vmscan.c:698 [inline] shrink_folio_list+0x59e0/0x7fc0 mm/vmscan.c:1418 evict_folios+0x999d/0xbf30 mm/vmscan.c:4711 try_to_shrink_lruvec+0x12b6/0x17e0 mm/vmscan.c:4874 shrink_one+0x43c/0xbd0 mm/vmscan.c:4919 shrink_many mm/vmscan.c:4982 [inline] lru_gen_shrink_node mm/vmscan.c:5060 [inline] shrink_node+0x453a/0x51e0 mm/vmscan.c:6047 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x849/0x26b0 mm/vmscan.c:6362 try_to_free_pages+0x986/0x16d0 mm/vmscan.c:6608 __perform_reclaim mm/page_alloc.c:4377 [inline] __alloc_pages_direct_reclaim+0x10d/0x340 mm/page_alloc.c:4399 __alloc_pages_slowpath+0xd30/0x18f0 mm/page_alloc.c:4843 __alloc_frozen_pages_noprof+0x595/0xab0 mm/page_alloc.c:5223 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x102/0x280 mm/mempolicy.c:2577 relay_alloc_buf kernel/relay.c:122 [inline] relay_create_buf kernel/relay.c:162 [inline] relay_open_buf+0x45a/0x1b00 kernel/relay.c:390 relay_open+0x5b3/0xf50 kernel/relay.c:519 blk_trace_setup_prepare+0x470/0x9a0 kernel/trace/blktrace.c:716 compat_blk_trace_setup kernel/trace/blktrace.c:864 [inline] blk_trace_ioctl+0x763/0x1000 kernel/trace/blktrace.c:940 compat_blkdev_ioctl+0x545/0xde0 block/ioctl.c:841 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x7f9/0x1270 fs/ioctl.c:638 ia32_sys_call+0x25d9/0x4340 arch/x86/include/generated/asm/syscalls_32.h:55 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x154/0x330 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:332 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370 entry_SYSENTER_compat_after_hwframe+0x84/0x8e CPU: 0 UID: 0 PID: 27591 Comm: syz.3.6284 Tainted: G W L syzkaller #0 PREEMPT(none) Tainted: [W]=WARN, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 =====================================================