------------[ cut here ]------------ refcount_t: increment on 0; use-after-free. WARNING: CPU: 0 PID: 31177 at lib/refcount.c:156 refcount_inc_checked lib/refcount.c:156 [inline] WARNING: CPU: 0 PID: 31177 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: 31177 Comm: udevd 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: ffff88808a24a380 R09: fffffbfff14a7758 R10: fffffbfff14a7757 R11: ffffffff8a53babf R12: ffff8880928d6c80 R13: ffff8880928d6c68 R14: ffff88809791d6c8 R15: ffff88809791d6a0 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:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:95 Code: 25 44 7d 18 09 41 bc f4 ff ff ff e8 0d a3 e9 ff 48 c7 05 2e 7d 18 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 65 48 8b 04 25 c0 fd 01 00 65 8b 15 94 78 8f 7e 81 e2 00 RSP: 0018:ffff8880863379d8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a7833968 RBX: 0000000000000000 RCX: ffffffff819f2a5a RDX: 0000000000000000 RSI: ffffffff819f29ff RDI: ffff8880a7833978 RBP: ffff888086337a10 R08: ffff88808a24a380 R09: ffffed101350db5e R10: ffffed101350db5d R11: ffff88809a86daef R12: ffff8880a7833968 R13: ffff88808aaf4108 R14: 00000000001f5000 R15: 00000000001f5000 vma_rb_insert mm/mmap.c:452 [inline] __vma_link_rb+0x263/0x370 mm/mmap.c:608 dup_mmap kernel/fork.c:586 [inline] dup_mm+0x86c/0x1430 kernel/fork.c:1346 copy_mm kernel/fork.c:1402 [inline] copy_process+0x28b7/0x6b00 kernel/fork.c:2017 _do_fork+0x146/0xfa0 kernel/fork.c:2369 __do_sys_clone kernel/fork.c:2524 [inline] __se_sys_clone kernel/fork.c:2505 [inline] __x64_sys_clone+0x18d/0x250 kernel/fork.c:2505 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f27bc4ddf46 Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 14 25 10 00 00 00 31 d2 49 81 c2 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 31 01 00 00 85 c0 41 89 c4 0f 85 3b 01 00 RSP: 002b:00007fff154d7e40 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fff154d7e40 RCX: 00007f27bc4ddf46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007fff154d7ea0 R08: 00000000000079c9 R09: 00000000000079c9 R10: 00007f27bcdfaa70 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff154d7e60 R14: 0000000000000005 R15: 0000000000000005 Kernel Offset: disabled Rebooting in 86400 seconds..