------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff88804cb52c90 object type: timer_list hint: rose_t0timer_expiry+0x0/0x560 net/rose/rose_link.c:-1 WARNING: lib/debugobjects.c:615 at debug_print_object lib/debugobjects.c:612 [inline], CPU#1: syz.4.5476/25287 WARNING: lib/debugobjects.c:615 at __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline], CPU#1: syz.4.5476/25287 WARNING: lib/debugobjects.c:615 at debug_check_no_obj_freed+0x405/0x550 lib/debugobjects.c:1129, CPU#1: syz.4.5476/25287 Modules linked in: CPU: 1 UID: 0 PID: 25287 Comm: syz.4.5476 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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 b7 6b 7e fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 40 6b 27 8c 48 c7 c2 c0 70 27 8c 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: 0000:ffffc90004707aa8 EFLAGS: 00010246 RAX: ffffffff8a888d00 RBX: ffffffff9a42de20 RCX: 0000000000000000 RDX: ffffffff8c2770c0 RSI: ffffffff8c276b40 RDI: ffffffff901b4570 RBP: ffffffff8bcf4a00 R08: ffff88804cb52c90 R09: ffffffff8bcf5d20 R10: dffffc0000000000 R11: ffffffff81b099e0 R12: ffff88804cb52e00 R13: ffffffff901b4570 R14: ffff88804cb52000 R15: ffff88804cb52c90 FS: 00005555722cf500(0000) GS:ffff8881255b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdaaefe42f8 CR3: 00000000b14da000 CR4: 00000000003526f0 Call Trace: slab_free_hook mm/slub.c:2601 [inline] slab_free mm/slub.c:6082 [inline] kfree+0x13a/0x610 mm/slub.c:6399 rose_neigh_put include/net/rose.h:166 [inline] rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7fd24346c500 Code: 0f 7e c1 66 48 0f 7e ca 48 39 c2 73 65 48 39 f0 0f 82 2a 01 00 00 48 39 f2 72 65 66 0f c6 c0 01 0f 11 45 00 4c 89 e6 eb 09 90 <48> 8b 4b 08 48 83 c3 08 48 39 d1 72 f3 48 8d 46 f8 48 8b 76 f8 48 RSP: 002b:00007ffe6e3734f0 EFLAGS: 00000283 RAX: 00007fd2430c7700 RBX: 00007fd2430b9ea8 RCX: ffffffff81d394d9 RDX: ffffffff8202d3e2 RSI: 00007fd2430c7700 RDI: 00007fd2430bfad0 RBP: 00007fd2430b7680 R08: 00007fd243800000 R09: 00007fd243816038 R10: 0000000000000001 R11: 0000000000000003 R12: 00007fd2430c7f28 R13: 000000000000001a R14: 0000000000002115 R15: 0000000000000001 ---------------- Code disassembly (best guess): 0: 89 44 24 20 mov %eax,0x20(%rsp) 4: e8 b7 6b 7e fd call 0xfd7e6bc0 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 40 6b 27 8c mov $0xffffffff8c276b40,%rsi 1c: 48 c7 c2 c0 70 27 8c mov $0xffffffff8c2770c0,%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