===================================================== BUG: KMSAN: uninit-value in process_next lib/842/842_compress.c:456 [inline] BUG: KMSAN: uninit-value in sw842_compress+0x1767/0x5990 lib/842/842_compress.c:543 process_next lib/842/842_compress.c:456 [inline] sw842_compress+0x1767/0x5990 lib/842/842_compress.c:543 crypto842_scompress+0x4f/0x70 crypto/842.c:78 scomp_acomp_comp_decomp+0x7c6/0xb90 scomp_acomp_compress+0x32/0x40 crypto/scompress.c:187 crypto_acomp_compress include/crypto/acompress.h:251 [inline] zswap_compress mm/zswap.c:962 [inline] zswap_store_page mm/zswap.c:1462 [inline] zswap_store+0x20c9/0x48b0 mm/zswap.c:1571 swap_writepage+0xa67/0x1950 mm/page_io.c:278 shmem_writepage+0x2360/0x25a0 mm/shmem.c:1647 pageout mm/vmscan.c:696 [inline] shrink_folio_list+0x5dd2/0x8220 mm/vmscan.c:1402 evict_folios+0x94ed/0xb9c0 mm/vmscan.c:4660 try_to_shrink_lruvec+0xc58/0x1080 mm/vmscan.c:4821 lru_gen_shrink_lruvec mm/vmscan.c:4970 [inline] shrink_lruvec+0x49a/0x47d0 mm/vmscan.c:5715 shrink_node_memcgs mm/vmscan.c:5951 [inline] shrink_node+0x105e/0x51c0 mm/vmscan.c:5992 shrink_zones mm/vmscan.c:6237 [inline] do_try_to_free_pages+0x820/0x2550 mm/vmscan.c:6299 try_to_free_mem_cgroup_pages+0x3fa/0xa60 mm/vmscan.c:6631 try_charge_memcg+0x71a/0x1780 mm/memcontrol.c:2255 obj_cgroup_charge_pages+0x2cb/0x640 mm/memcontrol.c:2636 __memcg_kmem_charge_page+0x151/0x520 mm/memcontrol.c:2663 __alloc_frozen_pages_noprof+0x93d/0xe00 mm/page_alloc.c:4756 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2270 alloc_frozen_pages_noprof mm/mempolicy.c:2341 [inline] alloc_pages_noprof+0x1b5/0x250 mm/mempolicy.c:2361 io_mem_alloc_compound io_uring/memmap.c:29 [inline] io_region_allocate_pages+0x168/0x8b0 io_uring/memmap.c:167 io_create_region+0x6eb/0x810 io_uring/memmap.c:223 io_allocate_scq_urings+0x774/0xa50 io_uring/io_uring.c:3508 io_uring_create+0xabc/0x1440 io_uring/io_uring.c:3703 io_uring_setup io_uring/io_uring.c:3793 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:3820 [inline] __se_sys_io_uring_setup+0x476/0x4d0 io_uring/io_uring.c:3814 __x64_sys_io_uring_setup+0x6c/0xa0 io_uring/io_uring.c:3814 x64_sys_call+0x2e82/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: get_next_data lib/842/842_compress.c:412 [inline] sw842_compress+0xdfc/0x5990 lib/842/842_compress.c:522 crypto842_scompress+0x4f/0x70 crypto/842.c:78 scomp_acomp_comp_decomp+0x7c6/0xb90 scomp_acomp_compress+0x32/0x40 crypto/scompress.c:187 crypto_acomp_compress include/crypto/acompress.h:251 [inline] zswap_compress mm/zswap.c:962 [inline] zswap_store_page mm/zswap.c:1462 [inline] zswap_store+0x20c9/0x48b0 mm/zswap.c:1571 swap_writepage+0xa67/0x1950 mm/page_io.c:278 shmem_writepage+0x2360/0x25a0 mm/shmem.c:1647 pageout mm/vmscan.c:696 [inline] shrink_folio_list+0x5dd2/0x8220 mm/vmscan.c:1402 evict_folios+0x94ed/0xb9c0 mm/vmscan.c:4660 try_to_shrink_lruvec+0xc58/0x1080 mm/vmscan.c:4821 lru_gen_shrink_lruvec mm/vmscan.c:4970 [inline] shrink_lruvec+0x49a/0x47d0 mm/vmscan.c:5715 shrink_node_memcgs mm/vmscan.c:5951 [inline] shrink_node+0x105e/0x51c0 mm/vmscan.c:5992 shrink_zones mm/vmscan.c:6237 [inline] do_try_to_free_pages+0x820/0x2550 mm/vmscan.c:6299 try_to_free_mem_cgroup_pages+0x3fa/0xa60 mm/vmscan.c:6631 try_charge_memcg+0x71a/0x1780 mm/memcontrol.c:2255 obj_cgroup_charge_pages+0x2cb/0x640 mm/memcontrol.c:2636 __memcg_kmem_charge_page+0x151/0x520 mm/memcontrol.c:2663 __alloc_frozen_pages_noprof+0x93d/0xe00 mm/page_alloc.c:4756 alloc_pages_mpol+0x4cd/0x890 mm/mempolicy.c:2270 alloc_frozen_pages_noprof mm/mempolicy.c:2341 [inline] alloc_pages_noprof+0x1b5/0x250 mm/mempolicy.c:2361 io_mem_alloc_compound io_uring/memmap.c:29 [inline] io_region_allocate_pages+0x168/0x8b0 io_uring/memmap.c:167 io_create_region+0x6eb/0x810 io_uring/memmap.c:223 io_allocate_scq_urings+0x774/0xa50 io_uring/io_uring.c:3508 io_uring_create+0xabc/0x1440 io_uring/io_uring.c:3703 io_uring_setup io_uring/io_uring.c:3793 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:3820 [inline] __se_sys_io_uring_setup+0x476/0x4d0 io_uring/io_uring.c:3814 __x64_sys_io_uring_setup+0x6c/0xa0 io_uring/io_uring.c:3814 x64_sys_call+0x2e82/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_page_from_iter_atomic+0x1314/0x3450 lib/iov_iter.c:483 copy_folio_from_iter_atomic include/linux/uio.h:210 [inline] generic_perform_write+0x8d1/0x1080 mm/filemap.c:4201 shmem_file_write_iter+0x2ba/0x2f0 mm/shmem.c:3454 do_iter_readv_writev+0x93a/0xbc0 vfs_iter_write+0x44d/0xd60 fs/read_write.c:974 lo_write_bvec drivers/block/loop.c:245 [inline] lo_write_simple drivers/block/loop.c:266 [inline] do_req_filebacked drivers/block/loop.c:520 [inline] loop_handle_cmd drivers/block/loop.c:1929 [inline] loop_process_work+0x15fb/0x3760 drivers/block/loop.c:1964 loop_workfn+0x48/0x60 drivers/block/loop.c:1988 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xc1a/0x1e80 kernel/workqueue.c:3319 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3400 kthread+0x6b9/0xef0 kernel/kthread.c:464 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was stored to memory at: lmWriteRecord+0x108c/0x1a50 fs/jfs/jfs_logmgr.c:473 lmLogSync+0x7ae/0xe00 fs/jfs/jfs_logmgr.c:969 jfs_syncpt+0xa8/0xe0 fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0xa8/0x110 fs/jfs/super.c:650 sync_filesystem+0x136/0x3c0 fs/sync.c:56 generic_shutdown_super+0x8b/0x4c0 fs/super.c:621 kill_block_super+0x42/0xd0 fs/super.c:1710 deactivate_locked_super+0xe0/0x3f0 fs/super.c:473 deactivate_super+0x14f/0x160 fs/super.c:506 cleanup_mnt+0x6bf/0x740 fs/namespace.c:1413 __cleanup_mnt+0x22/0x30 fs/namespace.c:1420 task_work_run+0x268/0x310 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xbf/0x160 kernel/entry/common.c:218 do_syscall_64+0xda/0x1e0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable lrd created at: lmLogSync+0x3f/0xe00 fs/jfs/jfs_logmgr.c:928 jfs_syncpt+0xa8/0xe0 fs/jfs/jfs_logmgr.c:1041 CPU: 1 UID: 0 PID: 6144 Comm: syz.1.59 Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 =====================================================