------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88801f782090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x150 include/linux/skbuff.h:2928
WARNING: lib/debugobjects.c:629 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:629, CPU#1: syz.1.4192/22647
Modules linked in:
CPU: 1 UID: 0 PID: 22647 Comm: syz.1.4192 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 82 05 e5 0b 41 56 48 8b 14 dd e0 2f 1b 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 2c c2 da 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000a08a38 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffffffff8c1b2f20 RSI: ffffffff8c1b2b40 RDI: ffffffff90e44950
RBP: 0000000000000001 R08: ffff88801f782090 R09: ffffffff8bb2bba0
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c1b2b40
R13: ffffffff8bb2bbe0 R14: ffffffff8a7ce7b0 R15: ffffc90000a08b38
FS: 0000000000000000(0000) GS:ffff888124439000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3d30f5040 CR3: 000000008f32f000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 00000000cd0f0449 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1146
slab_free_hook mm/slub.c:2616 [inline]
slab_free mm/slub.c:6165 [inline]
kfree+0x38f/0x6b0 mm/slub.c:6483
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
call_timer_fn+0x19a/0x670 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers+0x757/0xb30 kernel/time/timer.c:2373
__run_timer_base kernel/time/timer.c:2385 [inline]
__run_timer_base kernel/time/timer.c:2377 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2394
run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2404
handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xef/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+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x501/0x1ea0 arch/x86/kernel/unwind_orc.c:527
Code: 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 bd 13 00 00 0f b6 41 05 83 e0 07 0f 84 53 fe ff ff 3c 01 0f 84 7b fe ff ff 4c 8d 41 04 <4c> 89 fe 48 b8 00 00 00 00 00 fc ff df 4c 89 c2 48 c1 ee 03 48 c1
RSP: 0018:ffffc9000d317540 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff91875908
RDX: 0000000000000005 RSI: 0000000000000000 RDI: ffffffff90fbb734
RBP: ffffc9000d3175f8 R08: ffffffff9187590c R09: 0000000000000007
R10: 0000000000000200 R11: 000000000001755c R12: ffffc9000d317600
R13: ffffc9000d3175b0 R14: ffffc9000d3175e5 R15: ffffffff9187590d
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2685 [inline]
slab_free mm/slub.c:6165 [inline]
kmem_cache_free+0x124/0x6a0 mm/slub.c:6295
anon_vma_chain_free mm/rmap.c:147 [inline]
unlink_anon_vmas+0x228/0x8e0 mm/rmap.c:514
free_pgtables+0x2e7/0xd80 mm/memory.c:427
exit_mmap+0x44c/0xa30 mm/mmap.c:1314
__mmput+0x12a/0x410 kernel/fork.c:1175
mmput+0x67/0x80 kernel/fork.c:1198
exit_mm kernel/exit.c:581 [inline]
do_exit+0x819/0x2b60 kernel/exit.c:964
do_group_exit+0xd5/0x2a0 kernel/exit.c:1118
__do_sys_exit_group kernel/exit.c:1129 [inline]
__se_sys_exit_group kernel/exit.c:1127 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1127
x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f907cd9c819
Code: Unable to access opcode bytes at 0x7f907cd9c7ef.
RSP: 002b:00007ffda9cce838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f907cd9c819
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffda9cce89c R08: 0000000000000006 R09: 0000000000000011
R10: 00000000005d3ad4 R11: 0000000000000246 R12: 00000000000000d3
R13: 0000000000000011 R14: 0000000000126577 R15: 00007ffda9cce8f0
----------------
Code disassembly (best guess):
0: b8 00 00 00 00 mov $0x0,%eax
5: 00 fc add %bh,%ah
7: ff lcall (bad)
8: df 48 89 fisttps -0x77(%rax)
b: fa cli
c: 48 c1 ea 03 shr $0x3,%rdx
10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
14: 75 4f jne 0x65
16: 48 8d 3d 82 05 e5 0b lea 0xbe50582(%rip),%rdi # 0xbe5059f
1d: 41 56 push %r14
1f: 48 8b 14 dd e0 2f 1b mov -0x73e4d020(,%rbx,8),%rdx
26: 8c
27: 4c 89 e6 mov %r12,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 58 pop %rax
30: 83 05 2c c2 da 0b 01 addl $0x1,0xbdac22c(%rip) # 0xbdac263
37: 48 83 c4 18 add $0x18,%rsp
3b: 5b pop %rbx
3c: 5d pop %rbp
3d: 41 5c pop %r12
3f: 41 rex.B