==================================================================
BUG: KASAN: slab-use-after-free in timer_is_static_object+0x80/0x90 kernel/time/timer.c:691
Read of size 8 at addr ffff888054c4c498 by task syz.0.3218/15489

CPU: 2 UID: 0 PID: 15489 Comm: syz.0.3218 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 timer_is_static_object+0x80/0x90 kernel/time/timer.c:691
 lookup_object_or_alloc.part.0+0x41d/0x590 lib/debugobjects.c:679
 lookup_object_or_alloc lib/debugobjects.c:665 [inline]
 debug_object_activate+0x326/0x4c0 lib/debugobjects.c:820
 debug_timer_activate kernel/time/timer.c:793 [inline]
 __mod_timer+0x814/0xd30 kernel/time/timer.c:1124
 add_timer+0x62/0x90 kernel/time/timer.c:1249
 call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers+0x6ef/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__vmcs_readl arch/x86/kvm/vmx/vmx_ops.h:121 [inline]
RIP: 0010:vmcs_readl arch/x86/kvm/vmx/vmx_ops.h:188 [inline]
RIP: 0010:vmx_get_rflags+0x2a0/0x420 arch/x86/kvm/vmx/vmx.c:1487
Code: e8 35 5d 6a 00 90 0f 0b 90 e8 2c 5d 6a 00 be 08 00 00 00 4c 89 ef e8 ff cc d0 00 49 0f ba 6d 00 15 b8 20 68 00 00 41 0f 78 c4 <3e> 77 0e 45 31 e4 41 54 50 e8 82 32 43 0a 58 41 5c 48 8d bb f0 21
RSP: 0018:ffffc90003c5f718 EFLAGS: 00000202
RAX: 0000000000006820 RBX: ffff888047ba2940 RCX: ffffffff81514061
RDX: ffffed1008f7457a RSI: 0000000000000008 RDI: ffff888047ba2bc8
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1008f74579
R10: ffff888047ba2bcf R11: 0000000000000000 R12: 0000000000010046
R13: ffff888047ba2bc8 R14: ffff888055d720d0 R15: ffff888047ba2940
 kvm_get_rflags arch/x86/kvm/x86.c:13255 [inline]
 init_emulate_ctxt+0xe8/0x510 arch/x86/kvm/x86.c:8626
 x86_decode_emulated_instruction arch/x86/kvm/x86.c:9003 [inline]
 x86_emulate_instruction+0x9a2/0x1a90 arch/x86/kvm/x86.c:9057
 kvm_mmu_page_fault+0xbfd/0x1cb0 arch/x86/kvm/mmu/mmu.c:6361
 handle_ept_misconfig arch/x86/kvm/vmx/vmx.c:5725 [inline]
 handle_ept_misconfig+0x11a/0x3b0 arch/x86/kvm/vmx/vmx.c:5707
 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6507 [inline]
 vmx_handle_exit+0x6fb/0x1bd0 arch/x86/kvm/vmx/vmx.c:6532
 vcpu_enter_guest arch/x86/kvm/x86.c:11073 [inline]
 vcpu_run+0x320b/0x55a0 arch/x86/kvm/x86.c:11231
 kvm_arch_vcpu_ioctl_run+0x1023/0x1980 arch/x86/kvm/x86.c:11576
 kvm_vcpu_ioctl+0x5eb/0x1690 virt/kvm/kvm_main.c:4466
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d3898eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1d3985b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1d38bd5fa0 RCX: 00007f1d3898eba9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000000d
RBP: 00007f1d38a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d38bd6038 R14: 00007f1d38bd5fa0 R15: 00007ffed1ae1d98
 </TASK>

Allocated by task 6288:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
 kmalloc_noprof include/linux/slab.h:905 [inline]
 rose_add_node net/rose/rose_route.c:85 [inline]
 rose_rt_ioctl+0x880/0x2580 net/rose/rose_route.c:748
 rose_ioctl+0x64d/0x7d0 net/rose/af_rose.c:1381
 sock_do_ioctl+0x118/0x280 net/socket.c:1238
 sock_ioctl+0x227/0x6b0 net/socket.c:1359
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15497:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:243 [inline]
 __kasan_slab_free+0x60/0x70 mm/kasan/common.c:275
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2422 [inline]
 slab_free mm/slub.c:4695 [inline]
 kfree+0x2b4/0x4d0 mm/slub.c:4894
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x53f/0x630 net/rose/rose_timer.c:183
 call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers+0x6ef/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702

The buggy address belongs to the object at ffff888054c4c400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 152 bytes inside of
 freed 512-byte region [ffff888054c4c400, ffff888054c4c600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x54c4c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001531301 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5963, tgid 5963 (syz-executor), ts 56330618857, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2492 [inline]
 allocate_slab mm/slub.c:2660 [inline]
 new_slab+0x247/0x330 mm/slub.c:2714
 ___slab_alloc+0xcf2/0x1750 mm/slub.c:3901
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992
 __slab_alloc_node mm/slub.c:4067 [inline]
 slab_alloc_node mm/slub.c:4228 [inline]
 __do_kmalloc_node mm/slub.c:4375 [inline]
 __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4388
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x14c/0x870 net/ipv6/route.c:3811
 ip6_route_add.part.0+0x22/0x1d0 net/ipv6/route.c:3940
 ip6_route_add+0x45/0x60 net/ipv6/route.c:3937
 addrconf_add_mroute+0x1dd/0x350 net/ipv6/addrconf.c:2552
 addrconf_add_dev+0x14e/0x1c0 net/ipv6/addrconf.c:2570
 inet6_addr_add+0xfe/0x960 net/ipv6/addrconf.c:3032
 inet6_rtm_newaddr+0x1619/0x1c70 net/ipv6/addrconf.c:5059
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888054c4c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888054c4c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888054c4c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888054c4c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888054c4c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	e8 35 5d 6a 00       	call   0x6a5d3a
   5:	90                   	nop
   6:	0f 0b                	ud2
   8:	90                   	nop
   9:	e8 2c 5d 6a 00       	call   0x6a5d3a
   e:	be 08 00 00 00       	mov    $0x8,%esi
  13:	4c 89 ef             	mov    %r13,%rdi
  16:	e8 ff cc d0 00       	call   0xd0cd1a
  1b:	49 0f ba 6d 00 15    	btsq   $0x15,0x0(%r13)
  21:	b8 20 68 00 00       	mov    $0x6820,%eax
  26:	41 0f 78 c4          	vmread %rax,%r12
* 2a:	3e 77 0e             	ja,pt  0x3b <-- trapping instruction
  2d:	45 31 e4             	xor    %r12d,%r12d
  30:	41 54                	push   %r12
  32:	50                   	push   %rax
  33:	e8 82 32 43 0a       	call   0xa4332ba
  38:	58                   	pop    %rax
  39:	41 5c                	pop    %r12
  3b:	48                   	rex.W
  3c:	8d                   	.byte 0x8d
  3d:	bb                   	.byte 0xbb
  3e:	f0                   	lock
  3f:	21                   	.byte 0x21