syzbot

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ODEBUG: free active (active state 0) object: ffff88802e4a4490 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350
WARNING: CPU: 1 PID: 23994 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 23994 at lib/debugobjects.c:518 __debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
WARNING: CPU: 1 PID: 23994 at lib/debugobjects.c:518 debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 23994 Comm: syz.3.5584 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:debug_print_object lib/debugobjects.c:515 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:990 [inline]
RIP: 0010:debug_check_no_obj_freed+0x446/0x540 lib/debugobjects.c:1020
Code: 4c 8b 4d 00 48 c7 c7 a0 8b 1c 8b 48 c7 c6 00 88 1c 8b 48 c7 c2 20 8d 1c 8b 8b 0c 24 4d 89 f8 41 55 e8 ae 44 20 fd 48 83 c4 08 <0f> 0b 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc ff df ff 05 83 80 5a
RSP: 0018:ffffc900001f0a50 EFLAGS: 00010296
RAX: 3aeedd901d3ecd00 RBX: ffffffff97586ef8 RCX: ffff888067541e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffffff8accab20 R08: ffffc900001f0647 R09: 1ffff9200003e0c8
R10: dffffc0000000000 R11: fffff5200003e0c9 R12: ffff88802e4a4600
R13: ffffffff89796190 R14: ffff88802e4a4000 R15: ffff88802e4a4490
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34122ff8 CR3: 000000002e950000 CR4: 00000000003506e0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 slab_free_hook mm/slub.c:1786 [inline]
 slab_free_freelist_hook+0xd2/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 __kmem_cache_free+0xba/0x1e0 mm/slub.c:3843
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x4c6/0x5f0 net/rose/rose_timer.c:183
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__sanitizer_cov_trace_switch+0x1e/0x120 kernel/kcov.c:333
Code: 48 89 74 0a 18 48 89 44 0a 20 c3 90 f3 0f 1e fa 48 8b 06 48 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 02 7f 1e 48 85 c9 74 3c <48> 83 f9 01 0f 85 ee 00 00 00 b9 03 00 00 00 48 85 c0 75 36 e9 df
RSP: 0018:ffffc9000bd57110 EFLAGS: 00000202
RAX: 0000000000000003 RBX: ffffffff8f0e770c RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8cfa07e0 RDI: 0000000000000001
RBP: ffffc9000bd57238 R08: ffffc9000bd57247 R09: 0000000000000000
R10: ffffc9000bd57238 R11: fffff520017aae49 R12: ffffc9000bd571e8
R13: dffffc0000000000 R14: 0000000000000001 R15: ffffffff8f0e7710
 unwind_next_frame+0x16d9/0x2970 arch/x86/kernel/unwind_orc.c:641
 arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1811 [inline]
 slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
 slab_free mm/slub.c:3830 [inline]
 kmem_cache_free+0xf8/0x270 mm/slub.c:3852
 pagetable_pte_dtor include/linux/mm.h:2998 [inline]
 ___pte_free_tlb+0x2d/0x130 arch/x86/mm/pgtable.c:55
 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline]
 free_pte_range mm/memory.c:194 [inline]
 free_pmd_range mm/memory.c:212 [inline]
 free_pud_range mm/memory.c:246 [inline]
 free_p4d_range mm/memory.c:280 [inline]
 free_pgd_range+0x628/0xb10 mm/memory.c:360
 free_pgtables+0x697/0x770 mm/memory.c:-1
 exit_mmap+0x420/0xb90 mm/mmap.c:3313
 __mmput+0x118/0x3c0 kernel/fork.c:1355
 exit_mm+0x1f2/0x2c0 kernel/exit.c:569
 do_exit+0x8dd/0x2460 kernel/exit.c:870
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 get_signal+0x12fc/0x13f0 kernel/signal.c:2902
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 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:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f265cd9bf79
Code: Unable to access opcode bytes at 0x7f265cd9bf4f.
RSP: 002b:00007f265dce80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f265d015fa8 RCX: 00007f265cd9bf79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f265d015fa8
RBP: 00007f265d015fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f265d016038 R14: 00007ffff5f524d0 R15: 00007ffff5f525b8
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 89 74 0a 18       	mov    %rsi,0x18(%rdx,%rcx,1)
   5:	48 89 44 0a 20       	mov    %rax,0x20(%rdx,%rcx,1)
   a:	c3                   	ret
   b:	90                   	nop
   c:	f3 0f 1e fa          	endbr64
  10:	48 8b 06             	mov    (%rsi),%rax
  13:	48 8b 4e 08          	mov    0x8(%rsi),%rcx
  17:	48 83 c1 f8          	add    $0xfffffffffffffff8,%rcx
  1b:	48 c1 c1 3d          	rol    $0x3d,%rcx
  1f:	48 83 f9 02          	cmp    $0x2,%rcx
  23:	7f 1e                	jg     0x43
  25:	48 85 c9             	test   %rcx,%rcx
  28:	74 3c                	je     0x66
* 2a:	48 83 f9 01          	cmp    $0x1,%rcx <-- trapping instruction
  2e:	0f 85 ee 00 00 00    	jne    0x122
  34:	b9 03 00 00 00       	mov    $0x3,%ecx
  39:	48 85 c0             	test   %rax,%rax
  3c:	75 36                	jne    0x74
  3e:	e9                   	.byte 0xe9
  3f:	df                   	.byte 0xdf