================================================================== BUG: KASAN: slab-use-after-free in drop_metapage fs/jfs/jfs_metapage.c:311 [inline] BUG: KASAN: slab-use-after-free in release_metapage+0x680/0xa3c fs/jfs/jfs_metapage.c:892 Read of size 8 at addr ffff0000f66eb500 by task syz.3.106/7164 CPU: 1 UID: 0 PID: 7164 Comm: syz.3.106 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 drop_metapage fs/jfs/jfs_metapage.c:311 [inline] release_metapage+0x680/0xa3c fs/jfs/jfs_metapage.c:892 write_metapage fs/jfs/jfs_metapage.h:75 [inline] flush_metapage fs/jfs/jfs_metapage.h:81 [inline] ea_put fs/jfs/xattr.c:623 [inline] __jfs_setxattr+0xbd0/0xf84 fs/jfs/xattr.c:792 jfs_initxattrs+0x150/0x22c fs/jfs/xattr.c:1040 security_inode_init_security+0x6dc/0x7f4 security/security.c:1891 jfs_init_security+0xa4/0xec fs/jfs/xattr.c:1052 jfs_mkdir+0x228/0x8b4 fs/jfs/namei.c:240 vfs_mkdir+0x284/0x424 fs/namei.c:4453 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4501 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 7164: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] kmem_cache_alloc_noprof+0x338/0x648 mm/slub.c:5272 mempool_alloc_slab+0x58/0x74 mm/mempool.c:587 mempool_alloc_noprof+0x150/0x3f4 mm/mempool.c:406 alloc_metapage fs/jfs/jfs_metapage.c:264 [inline] __get_metapage+0x528/0xe8c fs/jfs/jfs_metapage.c:760 ea_get+0x868/0xec4 fs/jfs/xattr.c:528 __jfs_setxattr+0x460/0xf84 fs/jfs/xattr.c:727 jfs_initxattrs+0x150/0x22c fs/jfs/xattr.c:1040 security_inode_init_security+0x6dc/0x7f4 security/security.c:1891 jfs_init_security+0xa4/0xec fs/jfs/xattr.c:1052 jfs_mkdir+0x228/0x8b4 fs/jfs/namei.c:240 vfs_mkdir+0x284/0x424 fs/namei.c:4453 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4501 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 7202: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 __kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2523 [inline] slab_free mm/slub.c:6611 [inline] kmem_cache_free+0x18c/0x6dc mm/slub.c:6721 mempool_free_slab+0x28/0x38 mm/mempool.c:594 mempool_free+0xf8/0x5a0 mm/mempool.c:576 free_metapage fs/jfs/jfs_metapage.c:279 [inline] metapage_release_folio+0x374/0x48c fs/jfs/jfs_metapage.c:636 metapage_invalidate_folio+0x14c/0x1cc fs/jfs/jfs_metapage.c:671 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x264/0x3a0 mm/truncate.c:160 truncate_inode_pages_range+0x1f4/0xe18 mm/truncate.c:379 truncate_inode_pages+0x2c/0x3c mm/truncate.c:460 jfs_reconfigure+0x474/0x824 fs/jfs/super.c:406 reconfigure_super+0x1d4/0x6f0 fs/super.c:1076 do_remount fs/namespace.c:3279 [inline] path_mount+0xb88/0xdfc fs/namespace.c:4029 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount fs/namespace.c:4215 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000f66eb4d8 which belongs to the cache jfs_mp of size 184 The buggy address is located 40 bytes inside of freed 184-byte region [ffff0000f66eb4d8, ffff0000f66eb590) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1366eb flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c4c0aa00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f66eb400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000f66eb480: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb >ffff0000f66eb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f66eb580: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f66eb600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== read_mapping_page failed! ERROR: (device loop3): txAbort: