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Message-ID: <696de9c1.050a0220.3390f1.0040.GAE@google.com> Date: Mon, 19 Jan 2026 00:22:25 -0800 From: syzbot <syzbot+4d36862d0682266c49bf@...kaller.appspotmail.com> To: frank.li@...o.com, glaubitz@...sik.fu-berlin.de, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, slava@...eyko.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [hfs?] WARNING: ODEBUG bug in hfsplus_fill_super (4) Hello, syzbot found the following issue on: HEAD commit: 0f853ca2a798 Add linux-next specific files for 20260113 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15f4f99a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8d6e5303d96e21b5 dashboard link: https://syzkaller.appspot.com/bug?extid=4d36862d0682266c49bf compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/480cd223f3f6/disk-0f853ca2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1ca2f0dbb7cc/vmlinux-0f853ca2.xz kernel image: https://storage.googleapis.com/syzbot-assets/60a0fef5805b/bzImage-0f853ca2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4d36862d0682266c49bf@...kaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff88803b48ea38 object type: timer_list hint: delayed_sync_fs+0x0/0xf0 fs/hfsplus/super.c:-1 WARNING: lib/debugobjects.c:615 at debug_print_object lib/debugobjects.c:612 [inline], CPU#1: syz.5.8803/4349 WARNING: lib/debugobjects.c:615 at __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline], CPU#1: syz.5.8803/4349 WARNING: lib/debugobjects.c:615 at debug_check_no_obj_freed+0x405/0x550 lib/debugobjects.c:1129, CPU#1: syz.5.8803/4349 Modules linked in: CPU: 1 UID: 0 PID: 4349 Comm: syz.5.8803 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:debug_print_object lib/debugobjects.c:612 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1129 Code: 89 44 24 20 e8 47 c1 8d fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 a0 a3 e0 8b 48 c7 c2 c0 a8 e0 8b 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc RSP: 0018:ffffc9000af5f6b0 EFLAGS: 00010246 RAX: ffffffff829ebf60 RBX: ffffffff99d50010 RCX: 0000000000000000 RDX: ffffffff8be0a8c0 RSI: ffffffff8be0a3a0 RDI: ffffffff8fad4670 RBP: ffffffff8b8d30a0 R08: ffff88803b48ea38 R09: ffffffff8b8d4200 R10: dffffc0000000000 R11: ffffffff81ae2f10 R12: ffff88803b48ec00 R13: ffffffff8fad4670 R14: ffff88803b48e000 R15: ffff88803b48ea38 FS: 00007f64cf5f06c0(0000) GS:ffff888125cf7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f518962949d CR3: 0000000051490000 CR4: 00000000003526f0 Call Trace: <TASK> slab_free_hook mm/slub.c:2487 [inline] slab_free mm/slub.c:6690 [inline] kfree+0x13b/0x660 mm/slub.c:6898 hfsplus_fill_super+0xecc/0x1930 fs/hfsplus/super.c:653 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1204 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x31a/0xcf0 fs/namespace.c:3839 do_mount fs/namespace.c:4162 [inline] __do_sys_mount fs/namespace.c:4351 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4328 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f64ce790eea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f64cf5efe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f64cf5efef0 RCX: 00007f64ce790eea RDX: 0000200000000100 RSI: 0000200000002900 RDI: 00007f64cf5efeb0 RBP: 0000200000000100 R08: 00007f64cf5efef0 R09: 0000000002000010 R10: 0000000002000010 R11: 0000000000000246 R12: 0000200000002900 R13: 00007f64cf5efeb0 R14: 00000000000006d8 R15: 00002000000022c0 </TASK> ---------------- Code disassembly (best guess): 0: 89 44 24 20 mov %eax,0x20(%rsp) 4: e8 47 c1 8d fd call 0xfd8dc150 9: 48 8b 44 24 20 mov 0x20(%rsp),%rax e: 4c 8b 4d 00 mov 0x0(%rbp),%r9 12: 4c 89 ef mov %r13,%rdi 15: 48 c7 c6 a0 a3 e0 8b mov $0xffffffff8be0a3a0,%rsi 1c: 48 c7 c2 c0 a8 e0 8b mov $0xffffffff8be0a8c0,%rdx 23: 8b 0c 24 mov (%rsp),%ecx 26: 4d 89 f8 mov %r15,%r8 29: 50 push %rax * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: 4c 8b 6c 24 18 mov 0x18(%rsp),%r13 38: 48 rex.W 39: b9 00 00 00 00 mov $0x0,%ecx 3e: 00 fc add %bh,%ah --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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