# SIGSEGV in fdb\_run\_network() **URL:** \ **Category:** Using FoundationDB\ **Created:** [January 3, 2023, 8:09am UTC](https://forums.foundationdb.org/t/sigsegv-in-fdb-run-network/3716 "2023-01-03T08:09:57Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mdianjun](https://sea1.discourse-cdn.com/foundationdb/user_avatar/forums.foundationdb.org/mdianjun/32/1456_2.png) [@mdianjun](https://forums.foundationdb.org/u/mdianjun)\ **Post date:** [January 3, 2023, 8:09am UTC](https://forums.foundationdb.org/t/sigsegv-in-fdb-run-network/3716/1 "2023-01-03T08:09:57Z")
I encountered a SIGSEGV error when calling fdb\_run\_network(), the stack is as follows: ```auto Program terminated with signal SIGSEGV, Segmentation fault. #0 __GI_getenv (name=0x7f14dfc58ff0 "B_TLS_CERTIFICATE_FILE") at getenv.c:84 84 getenv.c: No such file or directory. [Current thread is 1 (Thread 0x7f14cc876700 (LWP 28214))] (gdb) bt #0 __GI_getenv (name=0x7f14dfc58ff0 "B_TLS_CERTIFICATE_FILE") at getenv.c:84 #1 0x00007f14df84b723 in fdb_transaction_set_option () from /lib/libfdb_c.so #2 0x00007f14df86a3a0 in fdb_transaction_set_option () from /lib/libfdb_c.so #3 0x00007f14df86d00c in fdb_transaction_set_option () from /lib/libfdb_c.so #4 0x00007f14df813a04 in fdb_transaction_set_option () from /lib/libfdb_c.so #5 0x00007f14df2785de in fdb_transaction_set_option () from /lib/libfdb_c.so #6 0x00007f14df6c3228 in fdb_transaction_set_option () from /lib/libfdb_c.so #7 0x00007f14df6c336b in fdb_transaction_set_option () from /lib/libfdb_c.so #8 0x00007f14df5f34d0 in fdb_transaction_set_option () from /lib/libfdb_c.so #9 0x00007f14df81257e in fdb_transaction_set_option () from /lib/libfdb_c.so #10 0x00007f14df151ef2 in fdb_transaction_set_option () from /lib/libfdb_c.so #11 0x00007f14df6bbbcf in fdb_transaction_set_option () from /lib/libfdb_c.so #12 0x00007f14df109b32 in fdb_transaction_set_option () from /lib/libfdb_c.so #13 0x00007f14df0e5089 in fdb_run_network () from /lib/libfdb_c.so #14 0x0000559993b248d5 in runFdbNetwork () #15 0x00007f14de0a7609 in start_thread (arg=) at pthread_create.c:477 #16 0x00007f14dd5b8133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 ``` There is a fdb parameter `FDB_TLS_CERTIFICATE_FILE`, but the stack shows `B_TLS_CERTIFICATE_FILE`. I referred to this issue [Issues · grpc/grpc · GitHub](https://github.com/grpc/grpc/issues/21990:) > it was a buffer overflow of the output variable. Please give me some suggestions, thanks! ---
**Author:** ![mdianjun](https://sea1.discourse-cdn.com/foundationdb/user_avatar/forums.foundationdb.org/mdianjun/32/1456_2.png) [@mdianjun](https://forums.foundationdb.org/u/mdianjun)\ **Post date:** [March 22, 2023, 7:30am UTC](https://forums.foundationdb.org/t/sigsegv-in-fdb-run-network/3716/4 "2023-03-22T07:30:07Z")
> > > Hello All, > I am seeing this seg fault, I have modified the existing example pro…gram and below is the details of my pgm and the proto file. > Can you let me know what is the issue here? what am I doing wrong. > > BT > > \`\`\` > Thread 1 "mytest\_async\_clie" received signal SIGSEGV, Segmentation fault. > \_\_GI\_getenv (name=0x7ffff570eac1 "CALDOMAIN") at getenv.c:84 > 84 getenv.c: No such file or directory. > (gdb) where > \#0 \_\_GI\_getenv (name=0x7ffff570eac1 "CALDOMAIN") at getenv.c:84 > \#1 0x00007ffff5706614 in ares\_init\_options () from /root/grpc/install/lib/libcares.so.2 > \#2 0x00007ffff78a42a7 in grpc\_ares\_ev\_driver\_create\_locked(grpc\_ares\_ev\_driver\*\*, grpc\_pollset\_set\*, int, grpc\_core::Combiner\*, grpc\_ares\_request\*) () from /root/grpc/install/lib/libgrpc.so.9 > \#3 0x00007ffff78a54b4 in grpc\_dns\_lookup\_ares\_continue\_after\_check\_localhost\_and\_ip\_literals\_locked(grpc\_ares\_request\*, char const\*, char const\*, char const\*, grpc\_pollset\_set\*, int, grpc\_core::Combiner\*) () > from /root/grpc/install/lib/libgrpc.so.9 > \#4 0x00007ffff78a602f in ?? () from /root/grpc/install/lib/libgrpc.so.9 > \#5 0x00007ffff78a2179 in ?? () from /root/grpc/install/lib/libgrpc.so.9 > \#6 0x00007ffff7862f82 in grpc\_core::ResolvingLoadBalancingPolicy::ResolvingLoadBalancingPolicy(grpc\_core::LoadBalancingPolicy::Args, grpc\_core::TraceFlag\*, std::unique\_ptr\, bool (\*)(void\*, grpc\_core::Resolver::Result const&, char const\*\*, grpc\_core::RefCountedPtr\\*, grpc\_error\*\*), void\*) () from /root/grpc/install/lib/libgrpc.so.9 > \#7 0x00007ffff784f907 in ?? () from /root/grpc/install/lib/libgrpc.so.9 > \#8 0x00007ffff77cac36 in grpc\_combiner\_continue\_exec\_ctx() () from /root/grpc/install/lib/libgrpc.so.9 > \#9 0x00007ffff77d3ec3 in grpc\_core::ExecCtx::Flush() () from /root/grpc/install/lib/libgrpc.so.9 > \#10 0x00007ffff77f4eed in grpc\_call\_start\_batch () from /root/grpc/install/lib/libgrpc.so.9 > \#11 0x0000555555575f85 in grpc::internal::CallOpSet\, grpc::internal::CallOpClientRecvStatus\>::ContinueFillOpsAfterInterception (this=0x5555557b6828) > at /root/grpc/install/include/grpcpp/impl/codegen/call\_op\_set.h:938 > \#12 0x0000555555575d18 in grpc::internal::CallOpSet\, grpc::internal::CallOpClientRecvStatus\>::FillOps (this=0x5555557b6828, call=0x5555557b67f0) > at /root/grpc/install/include/grpcpp/impl/codegen/call\_op\_set.h:868 > \#13 0x0000555555566411 in grpc::internal::Call::PerformOps (this=0x5555557b67f0, ops=0x5555557b6828) at /root/grpc/install/include/grpcpp/impl/codegen/call.h:69 > \#14 0x00005555555754ef in grpc\_impl::ClientAsyncResponseReader\::Finish (this=0x5555557b67e0, msg=0x7fffffffd8f0, status=0x7fffffffd930, tag=0x1) > at /root/grpc/install/include/grpcpp/impl/codegen/async\_unary\_call\_impl.h:150 > \#15 0x000055555557a2fb in myTestCPClient::SendCPPacket (this=0x7fffffffdbc0, request=...) at benu\_async\_client.cc:100 > \#16 0x0000555555579ab2 in main (argc=1, argv=0x7fffffffe488) at benu\_async\_client.cc:161 > > \`\`\` > Code modified from greeter\_async\_client.cc > > \`\`\` > /\* > \* > \* Copyright 2015 gRPC authors. > \* > \* Licensed under the Apache License, Version 2.0 (the "License"); > \* you may not use this file except in compliance with the License. > \* You may obtain a copy of the License at > \* > \* http://www.apache.org/licenses/LICENSE-2.0 > \* > \* Unless required by applicable law or agreed to in writing, software > \* distributed under the License is distributed on an "AS IS" BASIS, > \* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. > \* See the License for the specific language governing permissions and > \* limitations under the License. > \* > \*/ > > \#include \ > \#include \ > \#include \ > > \#include \ > \#include \ > > \#ifdef BAZEL\_BUILD > \#include "examples/protos/helloworld.grpc.pb.h" > \#else > \#include "mytestTest.grpc.pb.h" > \#endif > > using grpc::Channel; > using grpc::ClientAsyncResponseReader; > using grpc::ClientContext; > using grpc::CompletionQueue; > using grpc::Status; > using mytest\_cp\_pkts::ReceiveReport; > using mytest\_cp\_pkts::CPProcessPkt; > using mytest\_cp\_pkts::CP\_PACKETS\_RX\_TX; > using mytest\_cp\_pkts::PacketType; > using mytest\_cp\_pkts::EventType; > using mytest\_cp\_pkts::Report; > > class myTestCPClient { > public: > explicit myTestCPClient(std::shared\_ptr\ channel) > : stub\_(CP\_PACKETS\_RX\_TX::NewStub(channel)) {} > > void string2hexString(char\* input, char\* output, size\_t strLen) > { > int loop; > int i; > > i=0; > loop=0; > > //while(input\[loop\] != '\\0') > while(loop \< strLen) > { > sprintf((char\*)(output+i),"%02X", input\[loop\]); > loop+=1; > i+=2; > } > //insert NULL at the end of the output string > output\[i++\] = '\\0'; > } > // Assembles the client's payload, sends it and presents the response back > // from the server. > ReceiveReport \* SendCPPacket(const CPProcessPkt& request) { > // Data we are sending to the server. > > // Container for the data we expect from the server. > //CPProcessPkt request; > ReceiveReport reply; > > // Context for the client. It could be used to convey extra information to > // the server and/or tweak certain RPC behaviors. > ClientContext context; > > // The producer-consumer queue we use to communicate asynchronously with the > // gRPC runtime. > CompletionQueue cq; > > // Storage for the status of the RPC upon completion. > Status status; > > // stub\_-\>PrepareAsyncSayHello() creates an RPC object, returning > // an instance to store in "call" but does not actually start the RPC > // Because we are using the asynchronous API, we need to hold on to > // the "call" instance in order to get updates on the ongoing RPC. > std::unique\_ptr\ \> rpc( > stub\_-\>PrepareAsyncPktRequest(&context, request, &cq)); > > // StartCall initiates the RPC call > rpc-\>StartCall(); > > // Request that, upon completion of the RPC, "reply" be updated with the > // server's response; "status" with the indication of whether the operation > // was successful. Tag the request with the integer 1. > rpc-\>Finish(&reply, &status, (void\*)1); > void\* got\_tag; > bool ok = false; > // Block until the next result is available in the completion queue "cq". > // The return value of Next should always be checked. This return value > // tells us whether there is any kind of event or the cq\_ is shutting down. > GPR\_ASSERT(cq.Next(&got\_tag, &ok)); > > // Verify that the result from "cq" corresponds, by its tag, our previous > // request. > GPR\_ASSERT(got\_tag == (void\*)1); > // ... and that the request was completed successfully. Note that "ok" > // corresponds solely to the request for updates introduced by Finish(). > GPR\_ASSERT(ok); > > // Act upon the status of the actual RPC. > if (status.ok()) { > return &reply; > } else { > return NULL; > } > } > > private: > // Out of the passed in Channel comes the stub, stored here, our view of the > // server's exposed services. > std::unique\_ptr\ stub\_; > }; > > int main(int argc, char\*\* argv) { > // Instantiate the client. It requires a channel, out of which the actual RPCs > // are created. This channel models a connection to an endpoint (in this case, > // localhost at port 50051). We indicate that the channel isn't authenticated > // (use of InsecureChannelCredentials()). > std::string server; > if (argc \>= 2) > { > server = argv\[1\] + std::string(":50051"); > } > else > { > server = "localhost:50051"; > } > myTestCPClient client(grpc::CreateChannel( > server.c\_str(), grpc::InsecureChannelCredentials())); > char dhcp\_req\[\] = "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"; > > int dataLen = strlen(dhcp\_req); > > char output\[1024\] = {0}; > client.string2hexString(dhcp\_req, output, strlen(dhcp\_req)); > > CPProcessPkt packet; > > packet.set\_packet\_type(PacketType::DHCP); > packet.set\_event(EventType::EVENT\_NONE); > packet.set\_dp\_id(19); > packet.set\_port\_id(3); > packet.set\_data(output); > > std::string user("world"); > ReceiveReport \*reply = client.SendCPPacket(packet); // The actual RPC call! > std::cout \<\< "CP\_PACKETS\_RX\_TX received: " \<\< reply-\>processed\_pkt().port\_id() \<\< " dp: " \<\< reply-\>processed\_pkt().dp\_id() \<\< std::endl; > > return 0; > } > > \`\`\` > > my proto file > > > \`\`\` > // Copyright 2015 myTest > // > // Licensed under the Apache License, Version 2.0 (the "License"); > // you may not use this file except in compliance with the License. > // You may obtain a copy of the License at > // > // http://www.apache.org/licenses/LICENSE-2.0 > // > // Unless required by applicable law or agreed to in writing, software > // distributed under the License is distributed on an "AS IS" BASIS, > // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. > // See the License for the specific language governing permissions and > // limitations under the License. > > syntax = "proto3"; > > package myTest\_cp\_pkts; > > // Interface exported by the server. > service CP\_PACKETS\_RX\_TX { > // A simple RPC. > // > // Sends the packet to and from CP and/or DP > rpc PktRequest(CPProcessPkt) returns (ReceiveReport) {} > } > > enum PacketType { > DHCP = 0; > > ARP = 1; > > EVENT = 2; > }; > > // If PacketType is EVENT then the events can be of the following > > enum EventType { > EVENT\_NONE = 0; > }; > > enum Report { > RECEIVE\_OK = 0; > > RECEIVE\_FAIL = 1; > }; > > message CPProcessPkt { > PacketType packet\_type = 1; > > EventType event = 2; > > int32 dp\_id = 3; > > int32 port\_id = 4; > > string data = 5; > }; > > message ReceiveReport { > Report report = 1; > > CPProcessPkt processed\_pkt = 2; > }; > > \`\`\` ---
**Author:** ![mdianjun](https://sea1.discourse-cdn.com/foundationdb/user_avatar/forums.foundationdb.org/mdianjun/32/1456_2.png) [@mdianjun](https://forums.foundationdb.org/u/mdianjun)\ **Post date:** [March 22, 2023, 7:31am UTC](https://forums.foundationdb.org/t/sigsegv-in-fdb-run-network/3716/5 "2023-03-22T07:31:32Z")
This issue happens a lot: ```auto (gdb) bt #0 __GI_getenv (name=0x7f192d2be022 "B_TLS_VERIFY_PEERS") at getenv.c:84 #1 0x00007f192ceb0723 in fdb_transaction_set_option () from /lib/libfdb_c.so #2 0x00007f192cecf910 in fdb_transaction_set_option () from /lib/libfdb_c.so #3 0x00007f192ce7869e in fdb_transaction_set_option () from /lib/libfdb_c.so #4 0x00007f192c8dd5de in fdb_transaction_set_option () from /lib/libfdb_c.so #5 0x00007f192cd28228 in fdb_transaction_set_option () from /lib/libfdb_c.so #6 0x00007f192cd2836b in fdb_transaction_set_option () from /lib/libfdb_c.so #7 0x00007f192cc584d0 in fdb_transaction_set_option () from /lib/libfdb_c.so #8 0x00007f192ce7757e in fdb_transaction_set_option () from /lib/libfdb_c.so #9 0x00007f192c7b6ef2 in fdb_transaction_set_option () from /lib/libfdb_c.so #10 0x00007f192cd20bcf in fdb_transaction_set_option () from /lib/libfdb_c.so #11 0x00007f192c76eb32 in fdb_transaction_set_option () from /lib/libfdb_c.so #12 0x00007f192c74a089 in fdb_run_network () from /lib/libfdb_c.so #13 0x000055579f696505 in runFdbNetwork () #14 0x00007f192b465609 in start_thread (arg=) at pthread_create.c:477 #15 0x00007f192a4db133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 ```