------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 0 at lib/refcount.c:156 refcount_inc_checked lib/refcount.c:156 [inline]
WARNING: CPU: 1 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: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc1+ #77
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 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 18 8e 64 06 31 ff 89 de e8 db aa 35 fe 84 db 75 dd e8 92 a9 35 fe 48 c7 c7 00 03 c6 87 c6 05 f8 8d 64 06 01 e8 77 0c 07 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:ffff8880ae909bf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff815c5bd6 RDI: ffffed1015d21370
RBP: ffff8880ae909c00 R08: ffff8880a98d6340 R09: fffffbfff11b4285
R10: fffffbfff11b4284 R11: ffffffff88da1423 R12: ffff88809b865240
R13: ffff88809b865228 R14: ffff8880a022f3c8 R15: ffff8880a022f3a0
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/0x780 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+0x697/0x17a0 kernel/time/timer.c:1698
__do_softirq+0x262/0x98c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 48 e9 6e fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d d4 50 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d c4 50 4a 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 5e a1 22 fa e8 a9
RSP: 0018:ffff8880a98e7d68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e35 RBX: ffff8880a98d6340 RCX: 1ffffffff134b2b6
RDX: dffffc0000000000 RSI: ffffffff8178256e RDI: ffffffff873dcbfc
RBP: ffff8880a98e7d98 R08: ffff8880a98d6340 R09: ffffed101531ac69
R10: ffffed101531ac68 R11: ffff8880a98d6347 R12: dffffc0000000000
R13: ffffffff89a563b8 R14: 0000000000000000 R15: 0000000000000001
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+0x413/0x760 kernel/sched/idle.c:263
cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354
start_secondary+0x315/0x430 arch/x86/kernel/smpboot.c:264
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Kernel Offset: disabled
Rebooting in 86400 seconds..