------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 18783 at lib/refcount.c:156 refcount_inc_checked /lib/refcount.c:156 [inline]
WARNING: CPU: 0 PID: 18783 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: 18783 Comm: syz-executor.3 Not tainted 5.2.0+ #67
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+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: ffff88809107c1c0 R09: fffffbfff14a775a
R10: fffffbfff14a7759 R11: ffffffff8a53bacf R12: ffff88806c19e900
R13: ffff88806c19e8e8 R14: ffff888087d4e448 R15: ffff888087d4e420
 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
 </IRQ>
RIP: 0010:clear_inode+0x0/0x1e0 /fs/inode.c:518
Code: 5d 41 5e 41 5f 5d c3 e8 de ff b5 ff 0f 0b e9 62 ff ff ff 4c 89 e7 e8 ff 0f f0 ff eb 9d 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 55 41 54 53 48 89 fb e8 af ff b5 ff 4c 8d ab 08 02
RSP: 0018:ffff8880a4e9fd08 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc9000c580000
RDX: 00000000000006ed RSI: ffffffff81936851 RDI: ffff888062cc80c0
RBP: ffff8880a4e9fd50 R08: ffff88809107c1c0 R09: ffffed100c59907a
R10: ffffed100c599079 R11: ffff888062cc83cf R12: ffff888062cc80c0
R13: ffff888062cc8190 R14: ffff888062cc80e8 R15: ffffffff88256c20
 iput_final /fs/inode.c:1560 [inline]
 iput+0x530/0x8b0 /fs/inode.c:1586
 __sock_release+0x20e/0x280 /net/socket.c:602
 sock_release /net/socket.c:610 [inline]
 __sock_create+0x2fb/0x730 /net/socket.c:1447
 sock_create /net/socket.c:1469 [inline]
 __sys_socket+0x103/0x220 /net/socket.c:1511
 __do_sys_socket /net/socket.c:1520 [inline]
 __se_sys_socket /net/socket.c:1518 [inline]
 __x64_sys_socket+0x73/0xb0 /net/socket.c:1518
 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459819
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8cff861c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459819
RDX: 000000000000de8b RSI: 0000000000000005 RDI: 0000000000000016
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8cff8626d4
R13: 00000000004c825c R14: 00000000004deb30 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..