------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 0 at lib/refcount.c:156 refcount_inc_checked+0x2b/0x30 lib/refcount.c:156
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0-rc6+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x113/0x167 lib/dump_stack.c:113
 panic+0x212/0x4cb kernel/panic.c:219
 __warn.cold.8+0x1b/0x38 kernel/panic.c:576
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
RIP: 0010:refcount_inc_checked+0x2b/0x30 lib/refcount.c:156
Code: 48 89 e5 e8 97 fe ff ff 84 c0 74 02 5d c3 80 3d 93 69 f3 05 00 75 f5 48 c7 c7 00 52 41 87 c6 05 83 69 f3 05 01 e8 a8 d2 3d fe <0f> 0b 5d c3 90 55 48 89 e5 41 56 41 55 49 89 fd 48 c7 c7 60 52 41
RSP: 0018:ffff8880aea09c10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888098d03480 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff8827a8e8 RDI: ffffffff89d60d40
RBP: ffff8880aea09c10 R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809852e7c0
R13: ffff888098d034e8 R14: 000000000000001d R15: ffff888098d0391e
 sock_hold include/net/sock.h:649 [inline]
 sk_add_node include/net/sock.h:701 [inline]
 nr_insert_socket+0x28/0xd0 net/netrom/af_netrom.c:137
 nr_rx_frame+0x160f/0x1f00 net/netrom/af_netrom.c:1023
 nr_loopback_timer+0x64/0x120 net/netrom/nr_loopback.c:59
 call_timer_fn+0x14d/0x510 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 run_timer_softirq+0xc6f/0x1330 kernel/time/timer.c:1698
 __do_softirq+0x260/0x958 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x17f/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13e/0x540 arch/x86/kernel/apic/apic.c:1068
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:native_safe_halt+0x12/0x20 arch/x86/include/asm/irqflags.h:61
Code: 11 ff ff ff 4c 89 e7 e8 6c f2 f4 fa eb 97 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 e9 07 00 00 00 0f 00 2d f0 41 64 00 fb f4 <5d> c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00
RSP: 0018:ffffffff88207ce0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffffffff8827a040 RCX: 0000000000000000
RDX: 1ffffffff10643e1 RSI: 0000000000000006 RDI: ffffffff88321f08
RBP: ffffffff88207ce0 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88321ef8 R14: 0000000000000000 R15: ffffffff88f68438
 arch_safe_halt arch/x86/include/asm/paravirt.h:156 [inline]
 default_idle+0x51/0x310 arch/x86/kernel/process.c:580
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
 default_idle_call+0x6d/0x90 kernel/sched/idle.c:94
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x3e4/0x590 kernel/sched/idle.c:263
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:354
 rest_init+0x1a4/0x279 init/main.c:451
 arch_call_rest_init+0x9/0xc
 start_kernel+0x6bd/0x6f8 init/main.c:761
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Kernel Offset: disabled
Rebooting in 86400 seconds..