------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888056c6d090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:-1
WARNING: lib/debugobjects.c:615 at 0x0, CPU#1: syz.6.2910/17284
Modules linked in:
CPU: 1 UID: 0 PID: 17284 Comm: syz.6.2910 Not tainted syzkaller #0 PREEMPT(full)
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 c7 de 92 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 a0 cc bf 8b 48 c7 c2 c0 d1 bf 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:ffffc90000a08a70 EFLAGS: 00010246
RAX: ffffffff8a3bd800 RBX: ffffffff99aa1750 RCX: 0000000000000000
RDX: ffffffff8bbfd1c0 RSI: ffffffff8bbfcca0 RDI: ffffffff8f8aa470
RBP: ffffffff8b6d24a0 R08: ffff888056c6d090 R09: ffffffff8b6d3600
R10: dffffc0000000000 R11: ffffffff81ae6210 R12: ffff888056c6d200
R13: ffffffff8f8aa470 R14: ffff888056c6d000 R15: ffff888056c6d090
FS: 0000000000000000(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3276e0 CR3: 000000002441a000 CR4: 00000000003526f0
Call Trace:
slab_free_hook mm/slub.c:2471 [inline]
slab_free mm/slub.c:6663 [inline]
kfree+0x13b/0x660 mm/slub.c:6871
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers kernel/time/timer.c:2373 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2385
run_timer_base kernel/time/timer.c:2394 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404
handle_softirqs+0x27d/0x850 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x97/0x130 kernel/kcov.c:351
Code: 54 53 48 8b 54 24 20 65 4c 8b 04 25 08 f0 76 92 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d b9 9f b5 10 <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 6c
RSP: 0018:ffffc9000463f1a0 EFLAGS: 00000216
RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000005
RDX: ffffffff81c32a05 RSI: ffffffff8df99b60 RDI: 0000000000000004
RBP: 0000008efa8f5e2a R08: ffff88804a3d3d00 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000080000005 R12: dffffc0000000000
R13: ffff88801d2b1010 R14: ffff88801d2b145c R15: 000000000028ca24
rb_event_length+0x45/0x400 kernel/trace/ring_buffer.c:222
rb_read_data_buffer+0x438/0x580 kernel/trace/ring_buffer.c:1823
check_buffer+0x28a/0x750 kernel/trace/ring_buffer.c:4394
__rb_reserve_next+0x592/0xdb0 kernel/trace/ring_buffer.c:4493
rb_reserve_next_event kernel/trace/ring_buffer.c:4630 [inline]
ring_buffer_lock_reserve+0xbb5/0x1010 kernel/trace/ring_buffer.c:4689
__trace_buffer_lock_reserve kernel/trace/trace.c:1081 [inline]
trace_event_buffer_lock_reserve+0x1d0/0x6f0 kernel/trace/trace.c:2799
trace_event_buffer_reserve+0x248/0x340 kernel/trace/trace_events.c:672
do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_event_raw_event_bpf_trace_printk+0x100/0x260 kernel/trace/bpf_trace.h:11
__do_trace_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
trace_bpf_trace_printk+0x153/0x1b0 kernel/trace/bpf_trace.h:11
____bpf_trace_printk kernel/trace/bpf_trace.c:379 [inline]
bpf_trace_printk+0x11e/0x190 kernel/trace/bpf_trace.c:362
bpf_prog_b1367f0be6c54012+0x39/0x3f
bpf_dispatcher_nop_func include/linux/bpf.h:1376 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
bpf_trace_run2+0x284/0x4c0 kernel/trace/bpf_trace.c:2116
__bpf_trace_contention_begin+0xdc/0x130 include/trace/events/lock.h:95
__do_trace_contention_begin include/trace/events/lock.h:95 [inline]
trace_contention_begin+0xde/0x100 include/trace/events/lock.h:95
__mutex_lock_common kernel/locking/mutex.c:616 [inline]
__mutex_lock+0x198/0x1350 kernel/locking/mutex.c:776
uprobe_clear_state+0x53/0x290 kernel/events/uprobes.c:1820
__mmput+0x60/0x430 kernel/fork.c:1126
exit_mm+0x1da/0x2c0 kernel/exit.c:583
do_exit+0x658/0x2310 kernel/exit.c:961
do_group_exit+0x21c/0x2d0 kernel/exit.c:1114
__do_sys_exit_group kernel/exit.c:1125 [inline]
__se_sys_exit_group kernel/exit.c:1123 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1123
x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94e3f8f749
Code: Unable to access opcode bytes at 0x7f94e3f8f71f.
RSP: 002b:00007fff4101c498 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f94e3f8f749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff4101c4fc R08: 0000001a4101c58f R09: 00000000000927c0
R10: 00000000000001dc R11: 0000000000000246 R12: 0000000000000021
R13: 00000000000927c0 R14: 0000000000095dd0 R15: 00007fff4101c550
----------------
Code disassembly (best guess):
0: 89 44 24 20 mov %eax,0x20(%rsp)
4: e8 c7 de 92 fd call 0xfd92ded0
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 cc bf 8b mov $0xffffffff8bbfcca0,%rsi
1c: 48 c7 c2 c0 d1 bf 8b mov $0xffffffff8bbfd1c0,%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