================================================================== BUG: KASAN: slab-out-of-bounds in addressPXD fs/jfs/jfs_types.h:80 [inline] BUG: KASAN: slab-out-of-bounds in dtReadFirst+0x408/0x7b8 fs/jfs/jfs_dtree.c:3120 Read of size 4 at addr ffff0000f6aebe28 by task syz.4.47/6784 CPU: 1 UID: 0 PID: 6784 Comm: syz.4.47 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_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 addressPXD fs/jfs/jfs_types.h:80 [inline] dtReadFirst+0x408/0x7b8 fs/jfs/jfs_dtree.c:3120 jfs_readdir+0x548/0x3018 fs/jfs/jfs_dtree.c:2832 wrap_directory_iterator+0x90/0xf0 fs/readdir.c:65 shared_jfs_readdir+0x30/0x40 fs/jfs/namei.c:1540 iterate_dir+0x2dc/0x478 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64 fs/readdir.c:396 [inline] __arm64_sys_getdents64+0x110/0x2fc fs/readdir.c:396 __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:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000f6aeb750 which belongs to the cache jfs_ip of size 2232 The buggy address is located 1752 bytes inside of allocated 2232-byte region [ffff0000f6aeb750, ffff0000f6aec008) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x136ae8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000d415aa01 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c4c668c0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000d415aa01 head: 05ffc00000000040 ffff0000c4c668c0 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff0000d415aa01 head: 05ffc00000000003 fffffdffc3daba01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f6aebd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6aebd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000f6aebe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000f6aebe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f6aebf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ERROR: (device loop4): dtReadFirst: btstack overrun ERROR: (device loop4): 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