ERROR: (device loop1): txAbort: read_mapping_page failed! ERROR: (device loop1): txAbort: ================================================================== BUG: KASAN: slab-use-after-free in dtSplitPage+0xdc4/0x2cbc fs/jfs/jfs_dtree.c:-1 Read of size 1 at addr ffff0000f850b71d by task syz.1.232/7594 CPU: 1 UID: 0 PID: 7594 Comm: syz.1.232 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 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_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 dtSplitPage+0xdc4/0x2cbc fs/jfs/jfs_dtree.c:-1 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline] dtInsert+0xccc/0x49c0 fs/jfs/jfs_dtree.c:871 jfs_mkdir+0x5a4/0x8b4 fs/jfs/namei.c:270 vfs_mkdir+0x408/0x48c fs/namei.c:5130 do_mkdirat+0x238/0x448 fs/namei.c:5164 __do_sys_mkdirat fs/namei.c:5186 [inline] __se_sys_mkdirat fs/namei.c:5184 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:5184 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 7536: 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:570 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_lru_noprof+0x348/0x684 mm/slub.c:5282 jfs_alloc_inode+0x2c/0x68 fs/jfs/super.c:105 alloc_inode+0x68/0x19c fs/inode.c:346 new_inode+0x2c/0x130 fs/inode.c:1175 jfs_fill_super+0x438/0xb6c fs/jfs/super.c:511 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691 get_tree_bdev+0x2c/0x3c fs/super.c:1714 jfs_get_tree+0x28/0x38 fs/jfs/super.c:635 vfs_get_tree+0x90/0x28c fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3712 path_mount+0x5b4/0xdfc fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4201 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 4810: 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:584 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:2540 [inline] slab_free mm/slub.c:6668 [inline] kmem_cache_free+0x184/0x6e4 mm/slub.c:6779 jfs_free_inode+0x28/0x38 fs/jfs/super.c:116 i_callback+0x50/0x78 fs/inode.c:325 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0x848/0x1774 kernel/rcu/tree.c:2857 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2874 handle_softirqs+0x31c/0xc88 kernel/softirq.c:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:56 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x100/0x978 kernel/rcu/tree.c:3239 destroy_inode fs/inode.c:401 [inline] evict+0x83c/0xa74 fs/inode.c:861 iput_final fs/inode.c:1951 [inline] iput+0xc54/0xfdc fs/inode.c:2003 jfs_put_super+0x13c/0x188 fs/jfs/super.c:201 generic_shutdown_super+0x12c/0x2b8 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xc4/0x12c fs/super.c:474 deactivate_super+0xe0/0x100 fs/super.c:507 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1318 __cleanup_mnt+0x20/0x30 fs/namespace.c:1325 task_work_run+0x1dc/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x10c/0x18c kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x17c/0x26c arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000f850b6f0 which belongs to the cache jfs_ip of size 2216 The buggy address is located 45 bytes inside of freed 2216-byte region [ffff0000f850b6f0, ffff0000f850bf98) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x138508 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000cea15301 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c4bbc780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000d000d 00000000f5000000 ffff0000cea15301 head: 05ffc00000000040 ffff0000c4bbc780 dead000000000122 0000000000000000 head: 0000000000000000 00000000000d000d 00000000f5000000 ffff0000cea15301 head: 05ffc00000000003 fffffdffc3e14201 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f850b600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff0000f850b680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa fb >ffff0000f850b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f850b780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f850b800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== find_entry called with index = 0 read_mapping_page failed! ERROR: (device loop1): txAbort: