F2FS-fs (loop8): build fault injection rate: 690 F2FS-fs (loop8): invalid crc value F2FS-fs (loop8): f2fs_recover_fsync_data: recovery fsync data, check_only: 0 F2FS-fs (loop8): Mounted with checkpoint version = 48b305e5 ===================================================== 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 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 __vmalloc_node_noprof mm/vmalloc.c:4111 [inline] __vmalloc_noprof+0x128/0x1f0 mm/vmalloc.c:4127 do_replace+0x451/0x8b0 net/bridge/netfilter/ebtables.c:1135 do_ebt_set_ctl+0x24d/0x2230 net/bridge/netfilter/ebtables.c:2527 nf_setsockopt+0x4fb/0x550 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0x1f2/0x210 net/ipv4/ip_sockglue.c:1424 sock_common_setsockopt+0xf5/0x140 net/core/sock.c:3973 do_sock_setsockopt net/socket.c:2322 [inline] __sys_setsockopt+0x43e/0x580 net/socket.c:2347 __do_sys_setsockopt net/socket.c:2353 [inline] __se_sys_setsockopt net/socket.c:2350 [inline] __x64_sys_setsockopt+0xf4/0x1a0 net/socket.c:2350 x64_sys_call+0x28e3/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:55 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 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 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: 0 UID: 0 PID: 21555 Comm: syz.8.3182 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 =====================================================