===================================================== 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:1685 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 obj_cgroup_charge_pages+0x69/0x330 mm/memcontrol.c:2823 __memcg_kmem_charge_page+0x149/0x4c0 mm/memcontrol.c:2867 __alloc_frozen_pages_noprof+0x680/0xf50 mm/page_alloc.c:5257 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0x101/0x280 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3718 [inline] __vmalloc_area_node mm/vmalloc.c:3863 [inline] __vmalloc_node_range_noprof+0x1579/0x2d80 mm/vmalloc.c:4051 __kvmalloc_node_noprof+0xdbe/0x1e80 mm/slub.c:7168 ip_set_alloc+0x3d/0x50 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x5b4/0x1520 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0xd1c/0x1ff0 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0xce3/0xe90 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x54d/0x680 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x3ff/0x5430 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x10b2/0x1250 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xfe7/0x1080 net/socket.c:2592 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681 x64_sys_call+0x1c60/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:47 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:3513 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:1947 [inline] loop_process_work+0xf05/0x1ff0 drivers/block/loop.c:1982 loop_workfn+0x3e/0x60 drivers/block/loop.c:2006 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 fs/btrfs/extent_io.c:4131 [inline] copy_extent_buffer_full+0x3c6/0x5c0 fs/btrfs/extent_io.c:4179 btrfs_force_cow_block+0x7e5/0x2f20 fs/btrfs/ctree.c:525 btrfs_cow_block+0xa3c/0xc20 fs/btrfs/ctree.c:708 btrfs_search_slot+0x183f/0x4e60 fs/btrfs/ctree.c:2130 log_inode_item+0x15d/0x620 fs/btrfs/tree-log.c:4682 btrfs_log_inode+0x1057/0x8e70 fs/btrfs/tree-log.c:7073 btrfs_log_inode_parent+0x11e7/0x1e00 fs/btrfs/tree-log.c:7512 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] iomap_dio_complete+0xbd1/0x1020 fs/iomap/direct-io.c:125 btrfs_direct_write+0x146f/0x1a60 fs/btrfs/direct-io.c:923 btrfs_do_write_iter+0x442/0xd90 fs/btrfs/file.c:1460 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 iter_file_splice_write+0x12f1/0x20f0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x31a/0x7d0 fs/splice.c:1161 splice_direct_to_actor+0x9a3/0x1560 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x1e0/0x350 fs/splice.c:1230 do_sendfile+0x9fc/0x1130 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x1ea/0x290 fs/read_write.c:1417 __x64_sys_sendfile64+0xbd/0x120 fs/read_write.c:1417 x64_sys_call+0x3a6f/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:41 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: __write_extent_buffer+0x203/0x940 fs/btrfs/extent_io.c:4104 write_extent_buffer fs/btrfs/extent_io.c:4131 [inline] copy_extent_buffer_full+0x3c6/0x5c0 fs/btrfs/extent_io.c:4179 btrfs_force_cow_block+0x7e5/0x2f20 fs/btrfs/ctree.c:525 btrfs_cow_block+0xa3c/0xc20 fs/btrfs/ctree.c:708 btrfs_search_slot+0x183f/0x4e60 fs/btrfs/ctree.c:2130 log_inode_item+0x15d/0x620 fs/btrfs/tree-log.c:4682 btrfs_log_inode+0x1057/0x8e70 fs/btrfs/tree-log.c:7073 btrfs_log_inode_parent+0x11e7/0x1e00 fs/btrfs/tree-log.c:7512 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 iter_file_splice_write+0x12f1/0x20f0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x31a/0x7d0 fs/splice.c:1161 splice_direct_to_actor+0x9a3/0x1560 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x1e0/0x350 fs/splice.c:1230 do_sendfile+0x9fc/0x1130 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x1ea/0x290 fs/read_write.c:1417 __x64_sys_sendfile64+0xbd/0x120 fs/read_write.c:1417 x64_sys_call+0x3a6f/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:41 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: __write_extent_buffer+0x203/0x940 fs/btrfs/extent_io.c:4104 write_extent_buffer fs/btrfs/extent_io.c:4131 [inline] copy_extent_buffer_full+0x3c6/0x5c0 fs/btrfs/extent_io.c:4179 btrfs_force_cow_block+0x7e5/0x2f20 fs/btrfs/ctree.c:525 btrfs_cow_block+0xa3c/0xc20 fs/btrfs/ctree.c:708 btrfs_search_slot+0x183f/0x4e60 fs/btrfs/ctree.c:2130 log_inode_item+0x15d/0x620 fs/btrfs/tree-log.c:4682 btrfs_log_inode+0x1057/0x8e70 fs/btrfs/tree-log.c:7073 btrfs_log_inode_parent+0x11e7/0x1e00 fs/btrfs/tree-log.c:7512 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] iomap_dio_complete+0xbd1/0x1020 fs/iomap/direct-io.c:125 btrfs_direct_write+0x146f/0x1a60 fs/btrfs/direct-io.c:923 btrfs_do_write_iter+0x442/0xd90 fs/btrfs/file.c:1460 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 iter_file_splice_write+0x12f1/0x20f0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x31a/0x7d0 fs/splice.c:1161 splice_direct_to_actor+0x9a3/0x1560 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x1e0/0x350 fs/splice.c:1230 do_sendfile+0x9fc/0x1130 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x1ea/0x290 fs/read_write.c:1417 __x64_sys_sendfile64+0xbd/0x120 fs/read_write.c:1417 x64_sys_call+0x3a6f/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:41 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: __write_extent_buffer+0x203/0x940 fs/btrfs/extent_io.c:4104 write_extent_buffer fs/btrfs/extent_io.c:4131 [inline] copy_extent_buffer_full+0x3c6/0x5c0 fs/btrfs/extent_io.c:4179 btrfs_force_cow_block+0x7e5/0x2f20 fs/btrfs/ctree.c:525 btrfs_cow_block+0xa3c/0xc20 fs/btrfs/ctree.c:708 btrfs_search_slot+0x183f/0x4e60 fs/btrfs/ctree.c:2130 log_inode_item+0x15d/0x620 fs/btrfs/tree-log.c:4682 btrfs_log_inode+0x1057/0x8e70 fs/btrfs/tree-log.c:7073 btrfs_log_inode_parent+0x11e7/0x1e00 fs/btrfs/tree-log.c:7512 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 iter_file_splice_write+0x12f1/0x20f0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x31a/0x7d0 fs/splice.c:1161 splice_direct_to_actor+0x9a3/0x1560 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x1e0/0x350 fs/splice.c:1230 do_sendfile+0x9fc/0x1130 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x1ea/0x290 fs/read_write.c:1417 __x64_sys_sendfile64+0xbd/0x120 fs/read_write.c:1417 x64_sys_call+0x3a6f/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:41 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] iomap_dio_complete+0xbd1/0x1020 fs/iomap/direct-io.c:125 btrfs_direct_write+0x146f/0x1a60 fs/btrfs/direct-io.c:923 btrfs_do_write_iter+0x442/0xd90 fs/btrfs/file.c:1460 btrfs_file_write_iter+0x38/0x50 fs/btrfs/file.c:1480 iter_file_splice_write+0x12f1/0x20f0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x31a/0x7d0 fs/splice.c:1161 splice_direct_to_actor+0x9a3/0x1560 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x1e0/0x350 fs/splice.c:1230 do_sendfile+0x9fc/0x1130 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x1ea/0x290 fs/read_write.c:1417 __x64_sys_sendfile64+0xbd/0x120 fs/read_write.c:1417 x64_sys_call+0x3a6f/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:41 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: 1 UID: 0 PID: 13929 Comm: syz.7.1993 Tainted: G L syzkaller #0 PREEMPT(voluntary) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 =====================================================