===================================================== 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+0xfe1/0x2550 arch/x86/mm/fault.c:1387 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 rseq_set_ids_get_csaddr+0xb6/0x560 include/linux/rseq_entry.h:356 rseq_update_usr include/linux/rseq_entry.h:382 [inline] rseq_slowpath_update_usr kernel/rseq.c:286 [inline] __rseq_handle_slowpath+0x247/0x4c0 kernel/rseq.c:312 rseq_handle_slowpath include/linux/rseq.h:17 [inline] resume_user_mode_work include/linux/resume_user_mode.h:62 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x228/0x1b70 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x1e1/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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+0xfe1/0x2550 arch/x86/mm/fault.c:1387 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+0xfe1/0x2550 arch/x86/mm/fault.c:1387 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:5263 __alloc_pages_noprof+0x41/0xd0 mm/page_alloc.c:5274 __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 kswapd_shrink_node mm/vmscan.c:6901 [inline] balance_pgdat mm/vmscan.c:7084 [inline] kswapd+0x2b89/0x4d30 mm/vmscan.c:7354 kthread+0xd5c/0xf00 kernel/kthread.c:463 ret_from_fork+0x208/0x710 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 CPU: 0 UID: 0 PID: 6069 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(none) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 =====================================================