================================================================== BUG: KASAN: slab-use-after-free in dtSplitPage+0xdc4/0x2cbc fs/jfs/jfs_dtree.c:-1 Read of size 1 at addr ffff0000f3fa5335 by task syz.3.4/6664 CPU: 1 UID: 0 PID: 6664 Comm: syz.3.4 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #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_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+0x284/0x424 fs/namei.c:4366 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399 __do_sys_mkdirat fs/namei.c:4416 [inline] __se_sys_mkdirat fs/namei.c:4414 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 6664: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_lru_noprof+0x23c/0x3ec mm/slub.c:4248 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 ialloc+0x54/0x78c fs/jfs/jfs_inode.c:48 jfs_mknod+0x174/0x7ac fs/jfs/namei.c:1377 vfs_mknod+0x328/0x358 fs/namei.c:4235 do_mknodat+0x35c/0x4a8 fs/namei.c:-1 __do_sys_mknodat fs/namei.c:4313 [inline] __se_sys_mknodat fs/namei.c:4310 [inline] __arm64_sys_mknodat+0xac/0xc8 fs/namei.c:4310 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 23: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x74/0x98 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x184/0x550 mm/slub.c:4782 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:579 __do_softirq+0x14/0x20 kernel/softirq.c:613 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 kasan_record_aux_stack+0xb0/0xc8 mm/kasan/generic.c:548 __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:1897 [inline] iput+0x6e4/0x83c fs/inode.c:1923 discard_new_inode+0x194/0x27c fs/inode.c:1210 jfs_mknod+0x4a8/0x7ac fs/jfs/namei.c:1436 vfs_mknod+0x328/0x358 fs/namei.c:4235 do_mknodat+0x35c/0x4a8 fs/namei.c:-1 __do_sys_mknodat fs/namei.c:4313 [inline] __se_sys_mknodat fs/namei.c:4310 [inline] __arm64_sys_mknodat+0xac/0xc8 fs/namei.c:4310 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 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+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000f3fa52f8 which belongs to the cache jfs_ip of size 2232 The buggy address is located 61 bytes inside of freed 2232-byte region [ffff0000f3fa52f8, ffff0000f3fa5bb0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x133fa0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000f5892801 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c4951780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000d000d 00000000f5000000 ffff0000f5892801 head: 05ffc00000000040 ffff0000c4951780 dead000000000122 0000000000000000 head: 0000000000000000 00000000000d000d 00000000f5000000 ffff0000f5892801 head: 05ffc00000000003 fffffdffc3cfe801 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f3fa5200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ffff0000f3fa5280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fa >ffff0000f3fa5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f3fa5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f3fa5400: 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 loop3): txAbort: