panic: Incrementing non-positive count 0xc000663c00 on stack.PacketBuffer goroutine 310 [running]: panic(0x10fc920, 0xc00020a770) GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc0008153f0 sp=0xc000815328 pc=0x437c65 gvisor.dev/gvisor/pkg/tcpip/stack.(*packetBufferRefs).IncRef(0xc000663c00) bazel-out/k8-fastbuild-ST-3ea255117c10/bin/pkg/tcpip/stack/packet_buffer_refs.go:80 +0x15f fp=0xc000815468 sp=0xc0008153f0 pc=0x96a43f gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).HandlePacket(0xc00003c900, 0x4e21, 0xc0003430b0, 0x10, 0x4e21, 0xc0003430a0, 0x10, 0xc000663c00) pkg/tcpip/transport/udp/endpoint.go:924 +0x388 fp=0xc000818630 sp=0xc000815468 pc=0xb6d268 gvisor.dev/gvisor/pkg/tcpip/stack.(*endpointsByNIC).handlePacket(0xc00020def0, 0x4e21, 0xc0003430b0, 0x10, 0x4e21, 0xc0003430a0, 0x10, 0xc000663c00, 0xc0003430b0) pkg/tcpip/stack/transport_demuxer.go:185 +0x273 fp=0xc0008186b8 sp=0xc000818630 pc=0x979b73 gvisor.dev/gvisor/pkg/tcpip/stack.(*transportDemuxer).deliverPacket(0xc00021e840, 0xc000000011, 0xc000663c00, 0x4e21, 0xc0003430b0, 0x10, 0x4e21, 0xc0003430a0, 0x10, 0xc0008187c0) pkg/tcpip/stack/transport_demuxer.go:595 +0x450 fp=0xc000818758 sp=0xc0008186b8 pc=0x97c5d0 gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).DeliverTransportPacket(0xc00000a1e0, 0xc000000011, 0xc000663c00, 0x0) pkg/tcpip/stack/nic.go:859 +0x288 fp=0xc000818860 sp=0xc000818758 pc=0x965728 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).processExtensionHeaders(0xc000369800, 0xc00013238e, 0x30, 0x30, 0xc00081c380, 0x14b5100, 0xc0001a6500, 0x30) pkg/tcpip/network/ipv6/ipv6.go:1483 +0x1942 fp=0xc0008191e8 sp=0xc000818860 pc=0xb55a22 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).handleValidatedPacket(0xc000369800, 0xc00013238e, 0x30, 0x30, 0xc00081c380, 0x13150ca, 0x2) pkg/tcpip/network/ipv6/ipv6.go:1115 +0x2f9 fp=0xc000819448 sp=0xc0008191e8 pc=0xb53c59 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).HandlePacket(0xc000369800, 0xc00081c380) pkg/tcpip/network/ipv6/ipv6.go:1030 +0x169 fp=0xc0008196a8 sp=0xc000819448 pc=0xb53269 gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).DeliverNetworkPacket(0xc00000a1e0, 0xc000343008, 0x6, 0xc000343010, 0x6, 0xc0000086dd, 0xc00081c380) pkg/tcpip/stack/nic.go:775 +0x2d8 fp=0xc000819760 sp=0xc0008196a8 pc=0x9650f8 gvisor.dev/gvisor/pkg/tcpip/link/nested.(*Endpoint).DeliverNetworkPacket(0xc00017e9b0, 0xc000343008, 0x6, 0xc000343010, 0x6, 0x86dd, 0xc00081c380) pkg/tcpip/link/nested/nested.go:59 +0xbe fp=0xc0008197b8 sp=0xc000819760 pc=0xbe845e gvisor.dev/gvisor/pkg/tcpip/link/ethernet.(*Endpoint).DeliverNetworkPacket(0xc00017e9b0, 0x0, 0x0, 0x0, 0x0, 0x86dd, 0xc00081c380) pkg/tcpip/link/ethernet/ethernet.go:71 +0x15f fp=0xc000819828 sp=0xc0008197b8 pc=0xe98aff gvisor.dev/gvisor/pkg/tcpip/link/loopback.(*endpoint).WriteRawPacket(0xc00020a660, 0xc00081c000, 0x0, 0x0) pkg/tcpip/link/loopback/loopback.go:109 +0xfd fp=0xc000819898 sp=0xc000819828 pc=0xe9945d gvisor.dev/gvisor/pkg/tcpip/link/loopback.(*endpoint).WritePackets(0xc00020a660, 0xc00081c000, 0xc00081c000, 0x0, 0x0, 0x86dd) pkg/tcpip/link/loopback/loopback.go:81 +0x65 fp=0xc0008198d8 sp=0xc000819898 pc=0xe992c5 gvisor.dev/gvisor/pkg/tcpip/link/nested.(*Endpoint).WritePackets(...) pkg/tcpip/link/nested/nested.go:107 gvisor.dev/gvisor/pkg/tcpip/link/ethernet.(*Endpoint).WritePackets(0xc00017e9b0, 0xc00081c000, 0xc00081c000, 0x0, 0xc00000a380, 0x1360738) pkg/tcpip/link/ethernet/ethernet.go:91 +0xe2 fp=0xc000819938 sp=0xc0008198d8 pc=0xe98cc2 gvisor.dev/gvisor/pkg/tcpip/stack.(*delegatingQueueingDiscipline).WritePacket(0xc00020a670, 0xc00081c000, 0x0, 0xc00081c000) pkg/tcpip/stack/nic.go:152 +0x6c fp=0xc000819978 sp=0xc000819938 pc=0x961d4c gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).writePacket(0xc00000a1e0, 0xc00081c000, 0xc000342f70, 0x10) pkg/tcpip/stack/nic.go:392 +0x94 fp=0xc0008199b8 sp=0xc000819978 pc=0x9633d4 gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).WritePacket(0xc00000a1e0, 0xc0002903c0, 0xc00081c000, 0x0, 0x0) pkg/tcpip/stack/nic.go:355 +0x209 fp=0xc000819af8 sp=0xc0008199b8 pc=0x9631a9 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).writePacket.func1(0xc00081c000, 0xc00013230e, 0x28) pkg/tcpip/network/ipv6/ipv6.go:819 +0x48 fp=0xc000819b30 sp=0xc000819af8 pc=0xb64a68 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).handleFragments(0xc000369800, 0xc0002903c0, 0xc00000ffca, 0xc000663500, 0x11, 0xc000819cc0, 0x2, 0x1, 0xc00020a6d0, 0x2) pkg/tcpip/network/ipv6/ipv6.go:733 +0x206 fp=0xc000819c68 sp=0xc000819b30 pc=0xb51866 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).writePacket(0xc000369800, 0xc0002903c0, 0xc000663500, 0x11, 0x10, 0x4000000001) pkg/tcpip/network/ipv6/ipv6.go:814 +0x245 fp=0xc000819e98 sp=0xc000819c68 pc=0xb52005 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).WritePacket(0xc000369800, 0xc0002903c0, 0x4000000011, 0xc000663500, 0x9674cd, 0x14a7148) pkg/tcpip/network/ipv6/ipv6.go:777 +0x285 fp=0xc000819f38 sp=0xc000819e98 pc=0xb51ca5 gvisor.dev/gvisor/pkg/tcpip/stack.(*Route).WritePacket(0xc0002903c0, 0x4000000011, 0xc000663500, 0xc000624068, 0xc000663500) pkg/tcpip/stack/route.go:465 +0xad fp=0xc000819f78 sp=0xc000819f38 pc=0x96dc0d gvisor.dev/gvisor/pkg/tcpip/transport/internal/network.(*WriteContext).WritePacket(0xc0006240e0, 0xc000663500, 0x0, 0xc000624050, 0x8) pkg/tcpip/transport/internal/network/endpoint.go:262 +0xb0 fp=0xc000819fb0 sp=0xc000819f78 pc=0xaf3850 gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).write(0xc00003c900, 0x1498528, 0xc00017ea50, 0xc00025a420, 0x0, 0x0, 0x0, 0x0) pkg/tcpip/transport/udp/endpoint.go:469 +0x435 fp=0xc00081b560 sp=0xc000819fb0 pc=0xb6aef5 gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Write(0xc00003c900, 0x1498528, 0xc00017ea50, 0xc00025a420, 0xc000000000, 0x10, 0x4e21, 0x9f000a) pkg/tcpip/transport/udp/endpoint.go:334 +0x68 fp=0xc00081b5b0 sp=0xc00081b560 pc=0xb6a008 gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).SendMsg(0xc0006aa230, 0xc000560000, 0x14b2220, 0xc000664000, 0xc000346f00, 0x8, 0x0, 0xfff1, 0x100, 0xc000210420, ...) pkg/sentry/socket/netstack/netstack.go:3051 +0x206 fp=0xc00081b710 sp=0xc00081b5b0 pc=0xb85606 gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.sendSingleMsg(0xc000560000, 0x7f08633e1b30, 0xc0006aa1c0, 0xc0006aa1c0, 0x20000040, 0x0, 0x0, 0x0, 0x0) pkg/sentry/syscalls/linux/vfs2/socket.go:1112 +0x4d5 fp=0xc00081ba70 sp=0xc00081b710 pc=0xe76175 gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.SendMsg(0xc000560000, 0x3, 0x20000040, 0x0, 0x56054c205e40, 0x56054c205e40, 0x56054c205e40, 0x0, 0x0, 0x0, ...) pkg/sentry/syscalls/linux/vfs2/socket.go:986 +0x225 fp=0xc00081bb10 sp=0xc00081ba70 pc=0xe75465 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000560000, 0x2e, 0x3, 0x20000040, 0x0, 0x56054c205e40, 0x56054c205e40, 0x56054c205e40, 0x0, 0x13101c0, ...) pkg/sentry/kernel/task_syscall.go:103 +0x13c fp=0xc00081bc70 sp=0xc00081bb10 pc=0x9f181c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000560000, 0x2e, 0x3, 0x20000040, 0x0, 0x56054c205e40, 0x56054c205e40, 0x56054c205e40, 0x56054c205e40, 0x56054c205e40) pkg/sentry/kernel/task_syscall.go:238 +0x66 fp=0xc00081bcf8 sp=0xc00081bc70 pc=0x9f29c6 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc000560000, 0x2e, 0x3, 0x20000040, 0x0, 0x56054c205e40, 0x56054c205e40, 0x56054c205e40, 0x14c9008, 0xc0001b0a20) pkg/sentry/kernel/task_syscall.go:198 +0x98 fp=0xc00081bd58 sp=0xc00081bcf8 pc=0x9f25b8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000560000, 0x2, 0xc000560000) pkg/sentry/kernel/task_syscall.go:173 +0x15c fp=0xc00081be28 sp=0xc00081bd58 pc=0x9f1f5c gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc000560000, 0x148a760, 0x0) pkg/sentry/kernel/task_run.go:254 +0xc27 fp=0xc00081bf68 sp=0xc00081be28 pc=0x9e6ce7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000560000, 0xd) pkg/sentry/kernel/task_run.go:95 +0x182 fp=0xc00081bfd0 sp=0xc00081bf68 pc=0x9e5c22 runtime.goexit() src/runtime/asm_amd64.s:1371 +0x1 fp=0xc00081bfd8 sp=0xc00081bfd0 pc=0x472861 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start pkg/sentry/kernel/task_start.go:342 +0xfe