===================================================== BUG: KMSAN: uninit-value in check_template lib/842/842_compress.c:393 [inline] BUG: KMSAN: uninit-value in process_next lib/842/842_compress.c:456 [inline] BUG: KMSAN: uninit-value in sw842_compress+0x1584/0x4fa0 lib/842/842_compress.c:545 check_template lib/842/842_compress.c:393 [inline] process_next lib/842/842_compress.c:456 [inline] sw842_compress+0x1584/0x4fa0 lib/842/842_compress.c:545 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:1429 [inline] zswap_store+0x1ea0/0x4bb0 mm/zswap.c:1540 swap_writeout+0x8c1/0x1390 mm/page_io.c:275 shmem_writeout+0x1ac6/0x1f70 mm/shmem.c:1643 writeout mm/vmscan.c:660 [inline] pageout mm/vmscan.c:721 [inline] shrink_folio_list+0x56ca/0x7e30 mm/vmscan.c:1453 evict_folios+0x9a43/0xc010 mm/vmscan.c:4745 try_to_shrink_lruvec+0x12b6/0x17e0 mm/vmscan.c:4908 shrink_one+0x6b5/0xe10 mm/vmscan.c:4953 shrink_many mm/vmscan.c:5016 [inline] lru_gen_shrink_node mm/vmscan.c:5094 [inline] shrink_node+0x481a/0x54a0 mm/vmscan.c:6081 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x849/0x26b0 mm/vmscan.c:6401 try_to_free_pages+0x986/0x16d0 mm/vmscan.c:6647 __perform_reclaim mm/page_alloc.c:4345 [inline] __alloc_pages_direct_reclaim+0x10d/0x340 mm/page_alloc.c:4367 __alloc_pages_slowpath+0xd30/0x1900 mm/page_alloc.c:4816 __alloc_frozen_pages_noprof+0xa12/0xf00 mm/page_alloc.c:5196 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2435 __read_swap_cache_async+0x1f9/0x770 mm/swap_state.c:440 swap_cluster_readahead+0xa0d/0xb20 mm/swap_state.c:669 swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:813 do_swap_page+0xce9/0x9c40 mm/memory.c:4713 handle_pte_fault mm/memory.c:6180 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x4100/0xded0 mm/memory.c:6487 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: get_next_data lib/842/842_compress.c:412 [inline] sw842_compress+0xc8b/0x4fa0 lib/842/842_compress.c:522 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:1429 [inline] zswap_store+0x1ea0/0x4bb0 mm/zswap.c:1540 swap_writeout+0x8c1/0x1390 mm/page_io.c:275 shmem_writeout+0x1ac6/0x1f70 mm/shmem.c:1643 writeout mm/vmscan.c:660 [inline] pageout mm/vmscan.c:721 [inline] shrink_folio_list+0x56ca/0x7e30 mm/vmscan.c:1453 evict_folios+0x9a43/0xc010 mm/vmscan.c:4745 try_to_shrink_lruvec+0x12b6/0x17e0 mm/vmscan.c:4908 shrink_one+0x6b5/0xe10 mm/vmscan.c:4953 shrink_many mm/vmscan.c:5016 [inline] lru_gen_shrink_node mm/vmscan.c:5094 [inline] shrink_node+0x481a/0x54a0 mm/vmscan.c:6081 shrink_zones mm/vmscan.c:6339 [inline] do_try_to_free_pages+0x849/0x26b0 mm/vmscan.c:6401 try_to_free_pages+0x986/0x16d0 mm/vmscan.c:6647 __perform_reclaim mm/page_alloc.c:4345 [inline] __alloc_pages_direct_reclaim+0x10d/0x340 mm/page_alloc.c:4367 __alloc_pages_slowpath+0xd30/0x1900 mm/page_alloc.c:4816 __alloc_frozen_pages_noprof+0xa12/0xf00 mm/page_alloc.c:5196 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2435 __read_swap_cache_async+0x1f9/0x770 mm/swap_state.c:440 swap_cluster_readahead+0xa0d/0xb20 mm/swap_state.c:669 swapin_readahead+0x1d9/0x15b0 mm/swap_state.c:813 do_swap_page+0xce9/0x9c40 mm/memory.c:4713 handle_pte_fault mm/memory.c:6180 [inline] __handle_mm_fault mm/memory.c:6318 [inline] handle_mm_fault+0x4100/0xded0 mm/memory.c:6487 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: memcpy_from_iter lib/iov_iter.c:73 [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:249 [inline] copy_folio_from_iter_atomic+0x11f7/0x3c20 lib/iov_iter.c:479 generic_perform_write+0x8b1/0x1050 mm/filemap.c:4260 shmem_file_write_iter+0x2b7/0x2f0 mm/shmem.c:3464 lo_rw_aio+0x1268/0x1590 drivers/block/loop.c:-1 do_req_filebacked drivers/block/loop.c:-1 [inline] loop_handle_cmd drivers/block/loop.c:1923 [inline] loop_process_work+0xe30/0x1ec0 drivers/block/loop.c:1958 loop_workfn+0x3e/0x60 drivers/block/loop.c:1982 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3346 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427 kthread+0xd5c/0xf00 kernel/kthread.c:463 ret_from_fork+0x1f5/0x4c0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was stored to memory at: lmWriteRecord+0x135c/0x1e40 fs/jfs/jfs_logmgr.c:473 lmLogInit+0x2012/0x27a0 fs/jfs/jfs_logmgr.c:1366 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0xaef/0x2160 fs/jfs/jfs_logmgr.c:1069 jfs_mount_rw+0xdf/0x9f0 fs/jfs/jfs_mount.c:257 jfs_fill_super+0xabf/0x18f0 fs/jfs/super.c:532 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1691 get_tree_bdev+0x38/0x50 fs/super.c:1714 jfs_get_tree+0x35/0x40 fs/jfs/super.c:635 vfs_get_tree+0xb3/0x5c0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x839/0x15f0 fs/namespace.c:3727 path_mount+0x747/0x1fb0 fs/namespace.c:4037 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x6f7/0x7e0 fs/namespace.c:4215 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4215 x64_sys_call+0x3604/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable lrd created at: lmLogInit+0x41/0x27a0 fs/jfs/jfs_logmgr.c:1242 open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline] lmLogOpen+0xaef/0x2160 fs/jfs/jfs_logmgr.c:1069 CPU: 0 UID: 0 PID: 1 Comm: init Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 =====================================================