===================================================== BUG: KMSAN: uninit-value in sw842_compress+0xd09/0x5060 lib/842/842_compress.c:528 sw842_compress+0xd09/0x5060 lib/842/842_compress.c:528 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:1690 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 try_charge mm/memcontrol.c:2530 [inline] charge_memcg mm/memcontrol.c:4728 [inline] __mem_cgroup_charge+0x114/0x5c0 mm/memcontrol.c:4745 mem_cgroup_charge include/linux/memcontrol.h:663 [inline] shmem_alloc_and_add_folio+0xe4d/0x1bd0 mm/shmem.c:1970 shmem_get_folio_gfp+0xad3/0x1fc0 mm/shmem.c:2584 shmem_get_folio mm/shmem.c:2690 [inline] shmem_write_begin+0x230/0x560 mm/shmem.c:3343 generic_perform_write+0x364/0x1050 mm/filemap.c:4314 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3518 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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 stored to memory at: memcpy_from_iter lib/iov_iter.c:85 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:306 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:261 [inline] copy_folio_from_iter_atomic+0xea0/0x38b0 lib/iov_iter.c:491 generic_perform_write+0x8b7/0x1050 mm/filemap.c:4332 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3518 lo_rw_aio+0x1164/0x14a0 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1926 [inline] loop_process_work+0xf05/0x1ff0 drivers/block/loop.c:1961 loop_workfn+0x3e/0x60 drivers/block/loop.c:1985 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xae7/0x1d60 kernel/workqueue.c:3340 worker_thread+0x1741/0x1de0 kernel/workqueue.c:3421 kthread+0xd5a/0xf00 kernel/kthread.c:463 ret_from_fork+0x207/0x6f0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Uninit was stored to memory at: __write_extent_buffer+0x203/0x940 fs/btrfs/extent_io.c:4104 write_extent_buffer+0x39/0x50 fs/btrfs/extent_io.c:4131 btree_csum_one_bio+0x793/0x1190 fs/btrfs/disk-io.c:322 btrfs_bio_csum fs/btrfs/bio.c:584 [inline] btrfs_submit_chunk fs/btrfs/bio.c:835 [inline] btrfs_submit_bbio+0x2a5d/0x3b90 fs/btrfs/bio.c:907 write_one_eb+0x1123/0x13e0 fs/btrfs/extent_io.c:2253 btree_writepages+0x14e0/0x2320 fs/btrfs/extent_io.c:2355 do_writepages+0x3f2/0x860 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x227/0x280 mm/filemap.c:412 btrfs_write_marked_extents+0x2c6/0x640 fs/btrfs/transaction.c:1165 btrfs_sync_log+0xab8/0x3bb0 fs/btrfs/tree-log.c:3379 btrfs_sync_file+0x1bac/0x22e0 fs/btrfs/file.c:1771 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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 stored to memory at: blake2b_final+0xc8/0x110 lib/crypto/blake2b.c:150 crypto_blake2b_final+0x2f/0x60 crypto/blake2b.c:50 shash_default_finup+0x123/0x1a0 crypto/shash.c:95 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 crypto_shash_final include/crypto/hash.h:1025 [inline] csum_tree_block+0x4a3/0x4c0 fs/btrfs/disk-io.c:111 btree_csum_one_bio+0x46e/0x1190 fs/btrfs/disk-io.c:300 btrfs_bio_csum fs/btrfs/bio.c:584 [inline] btrfs_submit_chunk fs/btrfs/bio.c:835 [inline] btrfs_submit_bbio+0x2a5d/0x3b90 fs/btrfs/bio.c:907 write_one_eb+0x1123/0x13e0 fs/btrfs/extent_io.c:2253 btree_writepages+0x14e0/0x2320 fs/btrfs/extent_io.c:2355 do_writepages+0x3f2/0x860 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x227/0x280 mm/filemap.c:412 btrfs_write_marked_extents+0x2c6/0x640 fs/btrfs/transaction.c:1165 btrfs_sync_log+0xab8/0x3bb0 fs/btrfs/tree-log.c:3379 btrfs_sync_file+0x1bac/0x22e0 fs/btrfs/file.c:1771 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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 stored to memory at: blake2b_compress_generic+0xc2bd/0xc460 lib/crypto/blake2b.c:99 blake2b_final+0x96/0x110 lib/crypto/blake2b.c:148 crypto_blake2b_final+0x2f/0x60 crypto/blake2b.c:50 shash_default_finup+0x123/0x1a0 crypto/shash.c:95 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 crypto_shash_final include/crypto/hash.h:1025 [inline] csum_tree_block+0x4a3/0x4c0 fs/btrfs/disk-io.c:111 btree_csum_one_bio+0x46e/0x1190 fs/btrfs/disk-io.c:300 btrfs_bio_csum fs/btrfs/bio.c:584 [inline] btrfs_submit_chunk fs/btrfs/bio.c:835 [inline] btrfs_submit_bbio+0x2a5d/0x3b90 fs/btrfs/bio.c:907 write_one_eb+0x1123/0x13e0 fs/btrfs/extent_io.c:2253 btree_writepages+0x14e0/0x2320 fs/btrfs/extent_io.c:2355 do_writepages+0x3f2/0x860 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x227/0x280 mm/filemap.c:412 btrfs_write_marked_extents+0x2c6/0x640 fs/btrfs/transaction.c:1165 btrfs_sync_log+0xab8/0x3bb0 fs/btrfs/tree-log.c:3379 btrfs_sync_file+0x1bac/0x22e0 fs/btrfs/file.c:1771 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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 stored to memory at: blake2b_compress_generic+0x24d/0xc460 lib/crypto/blake2b.c:56 blake2b_final+0x96/0x110 lib/crypto/blake2b.c:148 crypto_blake2b_final+0x2f/0x60 crypto/blake2b.c:50 shash_default_finup+0x123/0x1a0 crypto/shash.c:95 crypto_shash_op_and_zero crypto/shash.c:105 [inline] crypto_shash_finup+0x327/0xe80 crypto/shash.c:171 crypto_shash_final include/crypto/hash.h:1025 [inline] csum_tree_block+0x4a3/0x4c0 fs/btrfs/disk-io.c:111 btree_csum_one_bio+0x46e/0x1190 fs/btrfs/disk-io.c:300 btrfs_bio_csum fs/btrfs/bio.c:584 [inline] btrfs_submit_chunk fs/btrfs/bio.c:835 [inline] btrfs_submit_bbio+0x2a5d/0x3b90 fs/btrfs/bio.c:907 write_one_eb+0x1123/0x13e0 fs/btrfs/extent_io.c:2253 btree_writepages+0x14e0/0x2320 fs/btrfs/extent_io.c:2355 do_writepages+0x3f2/0x860 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x227/0x280 mm/filemap.c:412 btrfs_write_marked_extents+0x2c6/0x640 fs/btrfs/transaction.c:1165 btrfs_sync_log+0xab8/0x3bb0 fs/btrfs/tree-log.c:3379 btrfs_sync_file+0x1bac/0x22e0 fs/btrfs/file.c:1771 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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 stored to memory at: blake2b_compress_generic+0xc3bf/0xc460 lib/crypto/blake2b.c:99 blake2b_update+0x20f/0x360 lib/crypto/blake2b.c:133 crypto_blake2b_update+0x35/0x60 crypto/blake2b.c:44 crypto_shash_finup+0x401/0xe80 crypto/shash.c:123 crypto_shash_update include/crypto/hash.h:1006 [inline] csum_tree_block+0x142/0x4c0 fs/btrfs/disk-io.c:97 btree_csum_one_bio+0x46e/0x1190 fs/btrfs/disk-io.c:300 btrfs_bio_csum fs/btrfs/bio.c:584 [inline] btrfs_submit_chunk fs/btrfs/bio.c:835 [inline] btrfs_submit_bbio+0x2a5d/0x3b90 fs/btrfs/bio.c:907 write_one_eb+0x1123/0x13e0 fs/btrfs/extent_io.c:2253 btree_writepages+0x14e0/0x2320 fs/btrfs/extent_io.c:2355 do_writepages+0x3f2/0x860 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x227/0x280 mm/filemap.c:412 btrfs_write_marked_extents+0x2c6/0x640 fs/btrfs/transaction.c:1165 btrfs_sync_log+0xab8/0x3bb0 fs/btrfs/tree-log.c:3379 btrfs_sync_file+0x1bac/0x22e0 fs/btrfs/file.c:1771 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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 stored to memory at: blake2b_compress_generic+0x22c/0xc460 lib/crypto/blake2b.c:54 blake2b_update+0x20f/0x360 lib/crypto/blake2b.c:133 crypto_blake2b_update+0x35/0x60 crypto/blake2b.c:44 crypto_shash_finup+0x401/0xe80 crypto/shash.c:123 crypto_shash_update include/crypto/hash.h:1006 [inline] csum_tree_block+0x142/0x4c0 fs/btrfs/disk-io.c:97 btree_csum_one_bio+0x46e/0x1190 fs/btrfs/disk-io.c:300 btrfs_bio_csum fs/btrfs/bio.c:584 [inline] btrfs_submit_chunk fs/btrfs/bio.c:835 [inline] btrfs_submit_bbio+0x2a5d/0x3b90 fs/btrfs/bio.c:907 write_one_eb+0x1123/0x13e0 fs/btrfs/extent_io.c:2253 btree_writepages+0x14e0/0x2320 fs/btrfs/extent_io.c:2355 do_writepages+0x3f2/0x860 mm/page-writeback.c:2598 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range+0x227/0x280 mm/filemap.c:412 btrfs_write_marked_extents+0x2c6/0x640 fs/btrfs/transaction.c:1165 btrfs_sync_log+0xab8/0x3bb0 fs/btrfs/tree-log.c:3379 btrfs_sync_file+0x1bac/0x22e0 fs/btrfs/file.c:1771 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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_noprof mm/page_alloc.c:5274 [inline] alloc_pages_bulk_noprof+0x11f6/0x19d0 mm/page_alloc.c:5194 btrfs_alloc_page_array fs/btrfs/extent_io.c:677 [inline] alloc_eb_folio_array+0x15a/0x670 fs/btrfs/extent_io.c:701 alloc_extent_buffer+0x884/0x3cf0 fs/btrfs/extent_io.c:3433 btrfs_find_create_tree_block+0x44/0x60 fs/btrfs/disk-io.c:592 btrfs_init_new_buffer fs/btrfs/extent-tree.c:5049 [inline] btrfs_alloc_tree_block+0x3fe/0x1bc0 fs/btrfs/extent-tree.c:5162 btrfs_alloc_log_tree_node fs/btrfs/disk-io.c:912 [inline] btrfs_add_log_tree+0x243/0x7a0 fs/btrfs/disk-io.c:960 start_log_trans fs/btrfs/tree-log.c:349 [inline] btrfs_log_inode_parent+0x9cf/0x1e00 fs/btrfs/tree-log.c:7508 btrfs_log_dentry_safe+0x96/0x130 fs/btrfs/tree-log.c:7614 btrfs_sync_file+0x1990/0x22e0 fs/btrfs/file.c:1733 vfs_fsync_range+0x1a1/0x250 fs/sync.c:188 generic_write_sync include/linux/fs.h:2618 [inline] btrfs_do_write_iter+0xb53/0xd90 fs/btrfs/file.c:1470 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 new_sync_write fs/read_write.c:593 [inline] vfs_write+0xbe1/0x15c0 fs/read_write.c:686 ksys_write+0x1d9/0x470 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x97/0xf0 fs/read_write.c:746 x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2 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: 0 UID: 0 PID: 14620 Comm: syz.4.1661 Tainted: G W L syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 =====================================================