------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: rose_transmit_restart_request net/rose/rose_link.c:-1 [inline]
ODEBUG: free active (active state 0) object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:284
WARNING: CPU: 1 PID: 9416 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 9416 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
WARNING: CPU: 1 PID: 9416 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x43c/0x530 lib/debugobjects.c:1009
Modules linked in:
CPU: 1 PID: 9416 Comm: syz.0.1550 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:979 [inline]
RIP: 0010:debug_check_no_obj_freed+0x43c/0x530 lib/debugobjects.c:1009
Code: ef e8 18 00 be fd 4c 8b 45 00 48 c7 c7 80 15 df 8a 48 c7 c6 40 12 df 8a 48 c7 c2 e0 16 df 8a 8b 0c 24 4d 89 e9 e8 54 87 38 fd <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 85 9a 0a
RSP: 0018:ffffc900001e0a10 EFLAGS: 00010246
RAX: 02aa3a2769bc2400 RBX: ffffffff96e292b8 RCX: ffff88807d23bb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8a8def40 R08: ffffc900001e0687 R09: 1ffff9200003c0d0
R10: dffffc0000000000 R11: fffff5200003c0d1 R12: ffff888024a09a00
R13: ffffffff892a2900 R14: ffff888024a09000 R15: ffff888024a09890
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55468706c0 CR3: 000000000c88e000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
slab_free_hook mm/slub.c:1704 [inline]
slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4a7/0x5d0 net/rose/rose_timer.c:183
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x53e/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:check_kcov_mode kernel/kcov.c:193 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x32/0x80 kernel/kcov.c:320
Code: e4 f8 7f 7e 65 8b 15 e5 f8 7f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 1c 16 00 00 00 74 4e 8b 91 f8 15 00 00 <83> fa 03 75 43 48 8b 91 00 16 00 00 44 8b 89 fc 15 00 00 49 c1 e1
RSP: 0018:ffffc90004dff3e0 EFLAGS: 00000246
RAX: ffffffff81ddacad RBX: ffffffff81ddac2d RCX: ffff88807d23bb80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffea000000000f R08: dffffc0000000000 R09: 1ffffffff215e648
R10: dffffc0000000000 R11: fffffbfff215e649 R12: dffffc0000000000
R13: 1ffff11027fff22c R14: 000000000005cd1e R15: ffff88813fff9160
pfn_valid+0x14d/0x420 include/linux/mmzone.h:1858
page_table_check_clear+0x1e/0x6b0 mm/page_table_check.c:67
ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
zap_pte_range mm/memory.c:1433 [inline]
zap_pmd_range mm/memory.c:1572 [inline]
zap_pud_range mm/memory.c:1601 [inline]
zap_p4d_range mm/memory.c:1622 [inline]
unmap_page_range+0x192d/0x2500 mm/memory.c:1643
unmap_vmas+0x260/0x390 mm/memory.c:1728
exit_mmap+0x20d/0x960 mm/mmap.c:3250
__mmput+0x118/0x3c0 kernel/fork.c:1205
exit_mm+0x1fe/0x2d0 kernel/exit.c:565
do_exit+0x905/0x2480 kernel/exit.c:867
do_group_exit+0x217/0x2d0 kernel/exit.c:1022
get_signal+0x1272/0x1350 kernel/signal.c:2871
arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f554699acb9
Code: Unable to access opcode bytes at 0x7f554699ac8f.
RSP: 002b:00007f55477f80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5546c15fa8 RCX: 00007f554699acb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5546c15fa8
RBP: 00007f5546c15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5546c16038 R14: 00007fffb45a4d40 R15: 00007fffb45a4e28
----------------
Code disassembly (best guess):
0: e4 f8 in $0xf8,%al
2: 7f 7e jg 0x82
4: 65 8b 15 e5 f8 7f 7e mov %gs:0x7e7ff8e5(%rip),%edx # 0x7e7ff8f0
b: 81 e2 00 01 ff 00 and $0xff0100,%edx
11: 74 11 je 0x24
13: 81 fa 00 01 00 00 cmp $0x100,%edx
19: 75 57 jne 0x72
1b: 83 b9 1c 16 00 00 00 cmpl $0x0,0x161c(%rcx)
22: 74 4e je 0x72
24: 8b 91 f8 15 00 00 mov 0x15f8(%rcx),%edx
* 2a: 83 fa 03 cmp $0x3,%edx <-- trapping instruction
2d: 75 43 jne 0x72
2f: 48 8b 91 00 16 00 00 mov 0x1600(%rcx),%rdx
36: 44 8b 89 fc 15 00 00 mov 0x15fc(%rcx),%r9d
3d: 49 rex.WB
3e: c1 .byte 0xc1
3f: e1 .byte 0xe1