------------[ 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+ #67 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+0x14/0x20 /arch/x86/entry/entry_64.S:1008 RIP: 0010:refcount_inc_checked /lib/refcount.c:156 [inline] RIP: 0010:refcount_inc_checked+0x61/0x70 /lib/refcount.c:154 Code: 1d 7f 6e 64 06 31 ff 89 de e8 cb d2 35 fe 84 db 75 dd e8 82 d1 35 fe 48 c7 c7 40 09 c6 87 c6 05 5f 6e 64 06 01 e8 77 39 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:ffff8880ae809bf0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff815c3a26 RDI: ffffed1015d01370 RBP: ffff8880ae809c00 R08: ffffffff88c7a1c0 R09: fffffbfff14a7757 R10: fffffbfff14a7756 R11: ffffffff8a53bab7 R12: ffff888086b2f480 R13: ffff888086b2f468 R14: ffff888098814208 R15: ffff8880988141e0 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: 68 96 73 fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d e4 26 4f 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d d4 26 4f 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 be 57 27 fa e8 79 RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a5e05 RBX: ffffffff88c7a1c0 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88c7aa4c RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff89a4f7b8 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+0x413/0x760 /kernel/sched/idle.c:263 cpu_startup_entry+0x1b/0x20 /kernel/sched/idle.c:354 rest_init+0x245/0x37b /init/main.c:451 arch_call_rest_init+0xe/0x1b start_kernel+0x912/0x951 /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:243 Kernel Offset: disabled Rebooting in 86400 seconds..