======================================
| [ 5529.122476][    C2] ==================================================================
| [ 5529.122710][ C2] BUG: KASAN: slab-use-after-free in dst_destroy (net/core/dst.c:115) 
| [ 5529.122912][    C2] Read of size 8 at addr ffff88800a6923b0 by task swapper/2/0
| [ 5529.123093][    C2]
[ 5529.123358][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 5529.123645][    C2] Call Trace:
[ 5529.123744][    C2]  <IRQ>
[ 5529.123813][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 5529.123948][ C2] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 5529.124113][ C2] ? dst_destroy (net/core/dst.c:115) 
[ 5529.124242][ C2] print_report (mm/kasan/report.c:489) 
[ 5529.124368][ C2] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:527 mm/kasan/../slab.h:206 mm/kasan/common.c:38) 
[ 5529.124501][ C2] kasan_report (mm/kasan/report.c:603) 
[ 5529.124596][ C2] ? dst_destroy (net/core/dst.c:115) 
[ 5529.124722][ C2] dst_destroy (net/core/dst.c:115) 
[ 5529.124847][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2196) 
[ 5529.124980][ C2] rcu_do_batch (kernel/rcu/tree.c:2196) 
[ 5529.125109][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2120) 
[ 5529.125233][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 5529.125393][ C2] rcu_core (kernel/rcu/tree.c:2473) 
[ 5529.125490][ C2] __do_softirq (kernel/softirq.c:554) 
[ 5529.125622][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 5529.125721][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[ 5529.125849][    C2]  </IRQ>
[ 5529.125916][    C2]  <TASK>
[ 5529.125980][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 5529.126139][ C2] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) 
[ 5529.126271][ C2] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 e6 30 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d d3 e6 30 00 	verw   0x30e6d3(%rip)        # 0x30e6fb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[ 5529.126724][    C2] RSP: 0018:ffffc9000015fdf8 EFLAGS: 00000246
[ 5529.126890][    C2] RAX: 00000000061d380f RBX: 1ffff9200002bfc1 RCX: ffffffffad3526a5
[ 5529.127080][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffaaaaefc4
[ 5529.127267][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2709c
[ 5529.127455][    C2] R10: ffff8880361384e3 R11: ffff88803613de40 R12: 0000000000000000
[ 5529.127714][    C2] R13: ffff888001b945c0 R14: dffffc0000000000 R15: 0000000000000000
[ 5529.127977][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 5529.128101][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 5529.128298][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 5529.128424][ C2] cpuidle_idle_call (kernel/sched/idle.c:192) 
[ 5529.128547][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 5529.128673][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 5529.128942][ C2] do_idle (kernel/sched/idle.c:332) 
[ 5529.129037][ C2] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) 
[ 5529.129162][ C2] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) 
[ 5529.129288][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) 


Finger prints:
print_report:kasan_report:dst_destroy:rcu_do_batch:rcu_core