ERROR: (device loop5): remounting filesystem as read-only ================================================================== BUG: KASAN: use-after-free in drop_metapage fs/jfs/jfs_metapage.c:222 [inline] BUG: KASAN: use-after-free in release_metapage+0x819/0xe10 fs/jfs/jfs_metapage.c:758 Read of size 8 at addr ffff88805254ceb0 by task jfsCommit/275 CPU: 1 PID: 275 Comm: jfsCommit Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 drop_metapage fs/jfs/jfs_metapage.c:222 [inline] release_metapage+0x819/0xe10 fs/jfs/jfs_metapage.c:758 txUnlock+0x427/0xcb0 fs/jfs/jfs_txnmgr.c:948 txLazyCommit fs/jfs/jfs_txnmgr.c:2717 [inline] jfs_lazycommit+0x583/0xb20 fs/jfs/jfs_txnmgr.c:2767 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 5380: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 mempool_alloc+0x18f/0x4e0 mm/mempool.c:393 alloc_metapage fs/jfs/jfs_metapage.c:175 [inline] __get_metapage+0x5e8/0x1060 fs/jfs/jfs_metapage.c:652 dtSplitRoot+0x1e5/0x1510 fs/jfs/jfs_dtree.c:1910 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline] dtInsert+0xe20/0x57a0 fs/jfs/jfs_dtree.c:871 jfs_rename+0x7b9/0x16a0 fs/jfs/namei.c:1224 vfs_rename+0xbbf/0x10d0 fs/namei.c:4840 do_renameat2+0xa83/0xf70 fs/namei.c:4993 __do_sys_rename fs/namei.c:5039 [inline] __se_sys_rename fs/namei.c:5037 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5037 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 5383: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kmem_cache_free+0x8f/0x210 mm/slub.c:3520 free_metapage fs/jfs/jfs_metapage.c:190 [inline] metapage_releasepage+0x5b6/0x720 fs/jfs/jfs_metapage.c:552 do_invalidatepage mm/truncate.c:157 [inline] truncate_cleanup_page+0x170/0x420 mm/truncate.c:176 truncate_inode_page mm/truncate.c:218 [inline] truncate_inode_pages_range+0xa84/0xef0 mm/truncate.c:397 jfs_remount+0x337/0x5a0 fs/jfs/super.c:456 reconfigure_super+0x219/0x880 fs/super.c:938 do_remount fs/namespace.c:2697 [inline] path_mount+0xd3e/0x1020 fs/namespace.c:3356 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88805254ce88 which belongs to the cache jfs_mp of size 184 The buggy address is located 40 bytes inside of 184-byte region [ffff88805254ce88, ffff88805254cf40) The buggy address belongs to the page: page:ffffea0001495300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5254c flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff8881469e4280 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x192800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4789, ts 101984650291, free_ts 100842267708 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 mempool_alloc+0x18f/0x4e0 mm/mempool.c:393 alloc_metapage fs/jfs/jfs_metapage.c:175 [inline] __get_metapage+0x5e8/0x1060 fs/jfs/jfs_metapage.c:652 diIAGRead fs/jfs/jfs_imap.c:2672 [inline] diRead+0x1fb/0xbb0 fs/jfs/jfs_imap.c:316 jfs_iget+0x89/0x3f0 fs/jfs/inode.c:35 jfs_fill_super+0x735/0xaf0 fs/jfs/super.c:585 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 kasan_depopulate_vmalloc_pte+0x67/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2573 [inline] apply_to_pmd_range mm/memory.c:2617 [inline] apply_to_pud_range mm/memory.c:2653 [inline] apply_to_p4d_range mm/memory.c:2689 [inline] __apply_to_page_range+0x983/0xd10 mm/memory.c:2725 kasan_release_vmalloc+0x93/0xb0 mm/kasan/shadow.c:485 __purge_vmap_area_lazy+0xc6e/0x18f0 mm/vmalloc.c:1711 _vm_unmap_aliases+0x410/0x4a0 mm/vmalloc.c:2114 change_page_attr_set_clr+0x311/0xc10 arch/x86/mm/pat/set_memory.c:1740 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline] set_memory_ro+0x89/0xd0 arch/x86/mm/pat/set_memory.c:1943 bpf_jit_binary_lock_ro include/linux/filter.h:919 [inline] bpf_int_jit_compile+0xc4af/0xcc80 arch/x86/net/bpf_jit_comp.c:2478 bpf_prog_select_runtime+0x46f/0x7c0 kernel/bpf/core.c:1977 bpf_prog_load+0x106e/0x1550 kernel/bpf/syscall.c:2358 __sys_bpf+0x4c2/0x670 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88805254cd80: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805254ce00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff88805254ce80: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805254cf00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88805254cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================