loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-use-after-free in dtCompare fs/jfs/jfs_dtree.c:3345 [inline] BUG: KASAN: slab-use-after-free in dtSearch+0x13a8/0x1d00 fs/jfs/jfs_dtree.c:650 Read of size 1 at addr ffff0000f34ea268 by task syz.0.147/7389 CPU: 0 UID: 0 PID: 7389 Comm: syz.0.147 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 dtCompare fs/jfs/jfs_dtree.c:3345 [inline] dtSearch+0x13a8/0x1d00 fs/jfs/jfs_dtree.c:650 jfs_lookup+0x13c/0x32c fs/jfs/namei.c:1461 __lookup_slow+0x254/0x378 fs/namei.c:1816 lookup_slow+0x5c/0x80 fs/namei.c:1833 walk_component+0x270/0x364 fs/namei.c:2151 lookup_last fs/namei.c:2652 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2676 filename_lookup+0x1ac/0x454 fs/namei.c:2705 user_path_at+0x50/0x74 fs/namei.c:3215 __do_sys_chdir fs/open.c:561 [inline] __se_sys_chdir fs/open.c:555 [inline] __arm64_sys_chdir+0xb0/0x274 fs/open.c:555 __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 6921: 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:4970 [inline] slab_alloc_node mm/slub.c:5280 [inline] kmem_cache_alloc_lru_noprof+0x33c/0x64c mm/slub.c:5299 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:1145 diReadSpecial+0x58/0x5e0 fs/jfs/jfs_imap.c:426 jfs_mount+0x22c/0x750 fs/jfs/jfs_mount.c:138 jfs_fill_super+0x53c/0xb6c fs/jfs/super.c:523 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:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x284/0x944 fs/namespace.c:3727 path_mount+0x5b4/0xdfc fs/namespace.c:4037 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 Freed by task 6187: 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:2539 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x18c/0x6dc mm/slub.c:6740 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+0x840/0x17d0 kernel/rcu/tree.c:2861 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2878 handle_softirqs+0x328/0xc88 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:559 __call_rcu_common kernel/rcu/tree.c:3123 [inline] call_rcu+0x100/0x978 kernel/rcu/tree.c:3243 destroy_inode fs/inode.c:401 [inline] evict+0x754/0x928 fs/inode.c:834 iput_final fs/inode.c:1914 [inline] iput+0x95c/0xad4 fs/inode.c:1966 diFreeSpecial+0x78/0x100 fs/jfs/jfs_imap.c:552 jfs_umount+0x18c/0x350 fs/jfs/jfs_umount.c:73 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x12c/0x2b8 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334 task_work_run+0x1dc/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x524/0x1a14 kernel/exit.c:966 do_group_exit+0x194/0x22c kernel/exit.c:1107 __do_sys_exit_group kernel/exit.c:1118 [inline] __se_sys_exit_group kernel/exit.c:1116 [inline] pid_child_should_wake+0x0/0x1dc kernel/exit.c:1116 __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 ffff0000f34e9b78 which belongs to the cache jfs_ip of size 2216 The buggy address is located 1776 bytes inside of freed 2216-byte region [ffff0000f34e9b78, ffff0000f34ea420) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1334e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000d3c95401 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c4c4c780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000d3c95401 head: 05ffc00000000040 ffff0000c4c4c780 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000d3c95401 head: 05ffc00000000003 fffffdffc3cd3a01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f34ea100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f34ea180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f34ea200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f34ea280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f34ea300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ERROR: (device loop0): dtSearch: stack overrun! ERROR: (device loop0): remounting filesystem as read-only btstack dump: bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 jfs_lookup: dtSearch returned -5 ERROR: (device loop0): dtSearch: stack overrun! btstack dump: bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 bn = 0, index = 0 jfs_lookup: dtSearch returned -5