------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 0 at lib/refcount.c:156 refcount_inc_checked /lib/refcount.c:156 [inline]
WARNING: CPU: 0 PID: 0 at lib/refcount.c:156 refcount_inc_checked+0x61/0x70 /lib/refcount.c:154
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.2.0+ #71
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+0x16f/0x1f0 /lib/dump_stack.c:113
 panic+0x2dc/0x755 /kernel/panic.c:219
 __warn.cold+0x20/0x4c /kernel/panic.c:576
 report_bug+0x263/0x2b0 /lib/bug.c:186
 fixup_bug /arch/x86/kernel/traps.c:179 [inline]
 fixup_bug /arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 /arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 /arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 /arch/x86/entry/entry_64.S:1026
RIP: 0010:refcount_inc_checked /lib/refcount.c:156 [inline]
RIP: 0010:refcount_inc_checked+0x61/0x70 /lib/refcount.c:154
Code: 1d 2c 9e 67 06 31 ff 89 de e8 9b 24 38 fe 84 db 75 dd e8 52 23 38 fe 48 c7 c7 40 d6 c5 87 c6 05 0c 9e 67 06 01 e8 87 4a 0a fe <0f> 0b eb c1 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41
RSP: 0018:ffff8880ae809bf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff815b9de2 RDI: ffffed1015d01370
RBP: ffff8880ae809c00 R08: ffffffff88c7a1c0 R09: fffffbfff14a6d57
R10: fffffbfff14a6d56 R11: ffffffff8a536ab7 R12: ffff8880941b20c0
R13: ffff8880941b20a8 R14: ffff888093944648 R15: ffff888093944620
 sock_hold /./include/net/sock.h:649 [inline]
 sk_add_node /./include/net/sock.h:701 [inline]
 nr_insert_socket+0x2d/0xe0 /net/netrom/af_netrom.c:137
 nr_rx_frame+0x1605/0x1e73 /net/netrom/af_netrom.c:1023
 nr_loopback_timer+0x7b/0x170 /net/netrom/nr_loopback.c:59
 call_timer_fn+0x1ac/0x700 /kernel/time/timer.c:1322
 expire_timers /kernel/time/timer.c:1366 [inline]
 __run_timers /kernel/time/timer.c:1685 [inline]
 __run_timers /kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x66c/0x16a0 /kernel/time/timer.c:1698
 __do_softirq+0x30d/0x970 /kernel/softirq.c:292
 invoke_softirq /kernel/softirq.c:373 [inline]
 irq_exit+0x1d0/0x200 /kernel/softirq.c:413
 exiting_irq /./arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x14e/0x550 /arch/x86/kernel/apic/apic.c:1095
 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:61
Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 44 b0 55 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 34 b0 55 00 fb f4 <c3> 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 9e fa 2c fa 65 44
RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5c75 RBX: ffffffff88c7a1c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88c7aa0c
RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 arch_cpu_idle+0xa/0x10 /arch/x86/kernel/process.c:571
 default_idle_call+0x84/0xb0 /kernel/sched/idle.c:94
 cpuidle_idle_call /kernel/sched/idle.c:154 [inline]
 do_idle+0x409/0x760 /kernel/sched/idle.c:263
 cpu_startup_entry+0x1b/0x20 /kernel/sched/idle.c:354
 rest_init+0x247/0x37d /init/main.c:451
 arch_call_rest_init+0xe/0x1b
 start_kernel+0x90f/0x94e /init/main.c:785
 x86_64_start_reservations+0x29/0x2b /arch/x86/kernel/head64.c:472
 x86_64_start_kernel+0x77/0x7b /arch/x86/kernel/head64.c:453
 secondary_startup_64+0xa4/0xb0 /arch/x86/kernel/head_64.S:241
Kernel Offset: disabled
Rebooting in 86400 seconds..