Segmentation fault when running demos/tpc_demo.cc

[jordan-at-cy]

hi , i have installed seastar, i builded demos/tpc_demo.cc into an executable

`

g++ tcp_demo.cc pkg-config --cflags --libs --static $SEASTAR/build/release/seastar.pc -g -o ./build/tcp_demo

`

after that , i launch that executable , but i got into Segmentation fault

`

changyao23@ubuntu:~/source_code/seastar/demos$ ./build/tcp_demo
Segmentation fault (core dumped)

`

i use gdb to show more information

`

Type "apropos word" to search for commands related to "word"...
Reading symbols from ./build/tcp_demo...
(gdb) r
Starting program: /home/changyao23/source_code/seastar/demos/build/tcp_demo
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
seastar::noncopyable_function<seastar::future (seastar::net::packet)>::operator=(seastar::noncopyable_function<seastar::future (seastar::net::packet)>&&) (x=..., this=0x108) at /home/changyao23/source_code/seastar/include/seastar/util/noncopyable_function.hh:202
202 this->~noncopyable_function();
(gdb) bt
#0 seastar::noncopyable_function<seastar::future (seastar::net::packet)>::operator=(seastar::noncopyable_function<seastar::future (seastar::net::packet)>&&) (x=..., this=0x108) at /home/changyao23/source_code/seastar/include/seastar/util/noncopyable_function.hh:202
#1 seastar::streamseastar::net::packet::start(seastar::noncopyable_function<seastar::future (seastar::net::packet)>) (next=...,
this=0xc8) at /home/changyao23/source_code/seastar/include/seastar/core/stream.hh:69
#2 seastar::streamseastar::net::packet::listen(seastar::noncopyable_function<seastar::future (seastar::net::packet)>) (next=...,
this=0xc8) at /home/changyao23/source_code/seastar/include/seastar/core/stream.hh:89
#3 seastar::net::device::receive(std::function<seastar::future (seastar::net::packet)>) (this=0x555555847180, next_packet=...)
at /home/changyao23/source_code/seastar/src/net/net.cc:230
#4 0x00005555556c51e6 in seastar::net::interface::interface (this=0x7fffffffc940,
dev=std::shared_ptrseastar::net::device (use count 2, weak count 0) = {...}) at /home/changyao23/source_code/seastar/src/net/net.cc:258
#5 0x00005555555a51a6 in main (ac=1, av=0x7fffffffe148) at tcp_demo.cc:67
(gdb)

`

i am just new to seastar , why this error happend , looking forward to your reply, thanks in advance

[jordan-at-cy]

and, i am using the latest seastar , "git log" returned messages as below

`

726edcc (HEAD -> master, origin/master, origin/HEAD) Fix markdown formatting
eef1d6e Merge 'Minor abort on OOM changes' from Travis Downs
9cbc1fe Merge 'Make io-tester jobs share sched classes' from Pavel Emelyanov

`

[rainhard]

the patch works now.
there should be a standard init/cleanup method, but i can't find it.

 #include <seastar/net/tcp.hh>
 #include <seastar/net/native-stack.hh>
 #include <seastar/core/reactor.hh>
+#include <seastar/core/app-template.hh>
+#include <seastar/core/alien.hh>
 #include <fmt/printf.h>
 
 using namespace seastar;
@@ -60,10 +62,20 @@ struct tcp_test {
     }
 };
 
+// see doc/native-stack.md
 int main(int ac, char** av) {
+    // init reactor
+    app_template::seastar_options ssopts;
+    std::unique_ptr<alien::instance> alien(std::make_unique<alien::instance>());
+    std::shared_ptr<smp> smp(std::make_shared<smp>(*alien));
+    smp->configure(ssopts.smp_opts, ssopts.reactor_opts);
+
     native_stack_options opts;
 
     auto vnet = create_virtio_net_device(opts.virtio_opts, opts.lro);
+    // init queue
+    auto qp = vnet->init_local_queue(opts, 0);
+    vnet->set_local_queue(std::move(qp));
     interface netif(std::move(vnet));
     ipv4 inet(&netif);