panic: Incrementing non-positive count 0xc0005b7180 on stack.PacketBuffer goroutine 30 [running]: panic(0x10fc920, 0xc000028430) GOROOT/src/runtime/panic.go:1065 +0x565 fp=0xc0007973f0 sp=0xc000797328 pc=0x437c65 gvisor.dev/gvisor/pkg/tcpip/stack.(*packetBufferRefs).IncRef(0xc0005b7180) bazel-out/k8-fastbuild-ST-4c64f0b3d5c7/bin/pkg/tcpip/stack/packet_buffer_refs.go:80 +0x15f fp=0xc000797468 sp=0xc0007973f0 pc=0x96a43f gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).HandlePacket(0xc000476f00, 0x4e21, 0xc000348de0, 0x10, 0x4e21, 0xc000348dd0, 0x10, 0xc0005b7180) pkg/tcpip/transport/udp/endpoint.go:924 +0x388 fp=0xc00079a630 sp=0xc000797468 pc=0xb6d268 gvisor.dev/gvisor/pkg/tcpip/stack.(*endpointsByNIC).handlePacket(0xc0004a7f50, 0x4e21, 0xc000348de0, 0x10, 0x4e21, 0xc000348dd0, 0x10, 0xc0005b7180, 0xc000348de0) pkg/tcpip/stack/transport_demuxer.go:185 +0x273 fp=0xc00079a6b8 sp=0xc00079a630 pc=0x979b73 gvisor.dev/gvisor/pkg/tcpip/stack.(*transportDemuxer).deliverPacket(0xc00000c4f8, 0xc000000011, 0xc0005b7180, 0x4e21, 0xc000348de0, 0x10, 0x4e21, 0xc000348dd0, 0x10, 0xc00079a7c0) pkg/tcpip/stack/transport_demuxer.go:595 +0x450 fp=0xc00079a758 sp=0xc00079a6b8 pc=0x97c5d0 gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).DeliverTransportPacket(0xc00000a1e0, 0xc000000011, 0xc0005b7180, 0x0) pkg/tcpip/stack/nic.go:859 +0x288 fp=0xc00079a860 sp=0xc00079a758 pc=0x965728 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).processExtensionHeaders(0xc00064c800, 0xc0001ee34e, 0x30, 0x30, 0xc0005b7880, 0x14b5100, 0xc000258400, 0x30) pkg/tcpip/network/ipv6/ipv6.go:1483 +0x1942 fp=0xc00079b1e8 sp=0xc00079a860 pc=0xb55a22 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).handleValidatedPacket(0xc00064c800, 0xc0001ee34e, 0x30, 0x30, 0xc0005b7880, 0x13150ca, 0x2) pkg/tcpip/network/ipv6/ipv6.go:1115 +0x2f9 fp=0xc00079b448 sp=0xc00079b1e8 pc=0xb53c59 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).HandlePacket(0xc00064c800, 0xc0005b7880) pkg/tcpip/network/ipv6/ipv6.go:1030 +0x169 fp=0xc00079b6a8 sp=0xc00079b448 pc=0xb53269 gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).DeliverNetworkPacket(0xc00000a1e0, 0xc000348d38, 0x6, 0xc000348d40, 0x6, 0xc0000086dd, 0xc0005b7880) pkg/tcpip/stack/nic.go:775 +0x2d8 fp=0xc00079b760 sp=0xc00079b6a8 pc=0x9650f8 gvisor.dev/gvisor/pkg/tcpip/link/nested.(*Endpoint).DeliverNetworkPacket(0xc0004b0690, 0xc000348d38, 0x6, 0xc000348d40, 0x6, 0x86dd, 0xc0005b7880) pkg/tcpip/link/nested/nested.go:59 +0xbe fp=0xc00079b7b8 sp=0xc00079b760 pc=0xbe845e gvisor.dev/gvisor/pkg/tcpip/link/ethernet.(*Endpoint).DeliverNetworkPacket(0xc0004b0690, 0x0, 0x0, 0x0, 0x0, 0x86dd, 0xc0005b7880) pkg/tcpip/link/ethernet/ethernet.go:71 +0x15f fp=0xc00079b828 sp=0xc00079b7b8 pc=0xe98aff gvisor.dev/gvisor/pkg/tcpip/link/loopback.(*endpoint).WriteRawPacket(0xc000028320, 0xc0005b7500, 0x0, 0x0) pkg/tcpip/link/loopback/loopback.go:109 +0xfd fp=0xc00079b898 sp=0xc00079b828 pc=0xe9945d gvisor.dev/gvisor/pkg/tcpip/link/loopback.(*endpoint).WritePackets(0xc000028320, 0xc0005b7500, 0xc0005b7500, 0x0, 0x0, 0x86dd) pkg/tcpip/link/loopback/loopback.go:81 +0x65 fp=0xc00079b8d8 sp=0xc00079b898 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(0xc0004b0690, 0xc0005b7500, 0xc0005b7500, 0x0, 0xc00000a380, 0x1360738) pkg/tcpip/link/ethernet/ethernet.go:91 +0xe2 fp=0xc00079b938 sp=0xc00079b8d8 pc=0xe98cc2 gvisor.dev/gvisor/pkg/tcpip/stack.(*delegatingQueueingDiscipline).WritePacket(0xc000028330, 0xc0005b7500, 0x0, 0xc0005b7500) pkg/tcpip/stack/nic.go:152 +0x6c fp=0xc00079b978 sp=0xc00079b938 pc=0x961d4c gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).writePacket(0xc00000a1e0, 0xc0005b7500, 0xc000348ca0, 0x10) pkg/tcpip/stack/nic.go:392 +0x94 fp=0xc00079b9b8 sp=0xc00079b978 pc=0x9633d4 gvisor.dev/gvisor/pkg/tcpip/stack.(*nic).WritePacket(0xc00000a1e0, 0xc0003b41e0, 0xc0005b7500, 0x0, 0x0) pkg/tcpip/stack/nic.go:355 +0x209 fp=0xc00079baf8 sp=0xc00079b9b8 pc=0x9631a9 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).writePacket.func1(0xc0005b7500, 0xc0001ee2ce, 0x28) pkg/tcpip/network/ipv6/ipv6.go:819 +0x48 fp=0xc00079bb30 sp=0xc00079baf8 pc=0xb64a68 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).handleFragments(0xc00064c800, 0xc0003b41e0, 0xc00000ffca, 0xc0005b6a80, 0x11, 0xc00079bcc0, 0x2, 0x1, 0xc000028390, 0x2) pkg/tcpip/network/ipv6/ipv6.go:733 +0x206 fp=0xc00079bc68 sp=0xc00079bb30 pc=0xb51866 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).writePacket(0xc00064c800, 0xc0003b41e0, 0xc0005b6a80, 0x11, 0x10, 0x4000000001) pkg/tcpip/network/ipv6/ipv6.go:814 +0x245 fp=0xc00079be98 sp=0xc00079bc68 pc=0xb52005 gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).WritePacket(0xc00064c800, 0xc0003b41e0, 0x4000000011, 0xc0005b6a80, 0x9674cd, 0x14a7148) pkg/tcpip/network/ipv6/ipv6.go:777 +0x285 fp=0xc00079bf38 sp=0xc00079be98 pc=0xb51ca5 gvisor.dev/gvisor/pkg/tcpip/stack.(*Route).WritePacket(0xc0003b41e0, 0x4000000011, 0xc0005b6a80, 0xc000664068, 0xc0005b6a80) pkg/tcpip/stack/route.go:465 +0xad fp=0xc00079bf78 sp=0xc00079bf38 pc=0x96dc0d gvisor.dev/gvisor/pkg/tcpip/transport/internal/network.(*WriteContext).WritePacket(0xc0006640e0, 0xc0005b6a80, 0x0, 0xc000664050, 0x8) pkg/tcpip/transport/internal/network/endpoint.go:262 +0xb0 fp=0xc00079bfb0 sp=0xc00079bf78 pc=0xaf3850 gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).write(0xc000476f00, 0x1498528, 0xc0004b0730, 0xc0000ba4c0, 0x0, 0x0, 0x0, 0x0) pkg/tcpip/transport/udp/endpoint.go:469 +0x435 fp=0xc00079d560 sp=0xc00079bfb0 pc=0xb6aef5 gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Write(0xc000476f00, 0x1498528, 0xc0004b0730, 0xc0000ba4c0, 0xc000000000, 0x10, 0x4e21, 0x9f000a) pkg/tcpip/transport/udp/endpoint.go:334 +0x68 fp=0xc00079d5b0 sp=0xc00079d560 pc=0xb6a008 gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).SendMsg(0xc0002e85b0, 0xc0003b1500, 0x14b2220, 0xc000263000, 0xc0000d2380, 0x8, 0x0, 0xfff1, 0x100, 0xc000600140, ...) pkg/sentry/socket/netstack/netstack.go:3051 +0x206 fp=0xc00079d710 sp=0xc00079d5b0 pc=0xb85606 gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.sendSingleMsg(0xc0003b1500, 0x3f439266acd0, 0xc0002e8540, 0xc0002e8540, 0x20000040, 0x0, 0x0, 0x0, 0x0) pkg/sentry/syscalls/linux/vfs2/socket.go:1112 +0x4d5 fp=0xc00079da70 sp=0xc00079d710 pc=0xe76175 gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.SendMsg(0xc0003b1500, 0x3, 0x20000040, 0x0, 0x5589b9111e40, 0x5589b9111e40, 0x5589b9111e40, 0x0, 0x0, 0x0, ...) pkg/sentry/syscalls/linux/vfs2/socket.go:986 +0x225 fp=0xc00079db10 sp=0xc00079da70 pc=0xe75465 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0003b1500, 0x2e, 0x3, 0x20000040, 0x0, 0x5589b9111e40, 0x5589b9111e40, 0x5589b9111e40, 0xc000001fa0, 0x13101c0, ...) pkg/sentry/kernel/task_syscall.go:103 +0x13c fp=0xc00079dc70 sp=0xc00079db10 pc=0x9f181c gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0003b1500, 0x2e, 0x3, 0x20000040, 0x0, 0x5589b9111e40, 0x5589b9111e40, 0x5589b9111e40, 0x5589b9111e40, 0x5589b9111e40) pkg/sentry/kernel/task_syscall.go:238 +0x66 fp=0xc00079dcf8 sp=0xc00079dc70 pc=0x9f29c6 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0003b1500, 0x2e, 0x3, 0x20000040, 0x0, 0x5589b9111e40, 0x5589b9111e40, 0x5589b9111e40, 0x0, 0x0) pkg/sentry/kernel/task_syscall.go:198 +0x98 fp=0xc00079dd58 sp=0xc00079dcf8 pc=0x9f25b8 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0003b1500, 0x2, 0xc0003b1500) pkg/sentry/kernel/task_syscall.go:173 +0x15c fp=0xc00079de28 sp=0xc00079dd58 pc=0x9f1f5c gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0003b1500, 0x148a760, 0x0) pkg/sentry/kernel/task_run.go:254 +0xc27 fp=0xc00079df68 sp=0xc00079de28 pc=0x9e6ce7 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0003b1500, 0x12) pkg/sentry/kernel/task_run.go:95 +0x182 fp=0xc00079dfd0 sp=0xc00079df68 pc=0x9e5c22 runtime.goexit() src/runtime/asm_amd64.s:1371 +0x1 fp=0xc00079dfd8 sp=0xc00079dfd0 pc=0x472861 created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start pkg/sentry/kernel/task_start.go:342 +0xfe