[Cppcms-users] Many opened TCP files

[CN <cn...@fa...>]

/var/log/syslog:

Sep 28 06:01:51 host1 cppcms-app: cppcms: Caught exception [Failed to
read /dev/urandom]#0120x4302ad:
booster::runtime_error::runtime_error(std::string const&) + 0x5d in
/usr/local/bin/cppcms-app#0120x7fa3e52ea5e4:
cppcms::urandom_device::generate(void*, unsigned int) + 0xa4 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e52ed961:
cppcms::session_interface::generate_csrf_token() + 0x31 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e52f2e37:
cppcms::session_interface::save() + 0x257 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e52694a3:
cppcms::http::response::write_http_headers(std::ostream&) + 0x23 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e526b1f2:
cppcms::http::response::out() + 0x542 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e527d024:
cppcms::application::render(std::string, cppcms::base_content&) + 0x44
in /usr/local/lib/libcppcms.so.1#0120x454a40: user::login() + 0x690 in
/usr/local/bin/cppcms-app#0120x456ae0: booster::function<void
()>::callable_impl<void, cppcms::url_dispatcher::binder0<user> >::call()
+ 0x30 in /usr/local/bin/cppcms-app#0120x7fa3e5289f61: ??? + 0xe5289f61
in /usr/local/lib/libcppcms.so.1#0120x7fa3e52828cd:
cppcms::url_dispatcher::dispatch(std::string) + 0xdd in
/usr/local/lib/libcppcms.so.1#0120x7fa3e524503b:
cppcms::application::main(std::string) + 0x2b in
/usr/local/lib/libcppcms.so.1#0120x7fa3e528257c: ??? + 0xe528257c in
/usr/local/lib/libcppcms.so.1#0120x7fa3e52828cd:
cppcms::url_dispatcher::dispatch(std::string) + 0xdd in
/usr/local/lib/libcppcms.so.1#0120x42be40:
multi_thread::main(std::string) + 0x470 in
/usr/local/bin/cppcms-app#0120x7fa3e5275824:
cppcms::http::context::dispatch(booster::intrusive_ptr<cppcms::application>
const&, std::string const&, bool) + 0xa4 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e527678e:
cppcms::http::context::dispatch(booster::shared_ptr<cppcms::application_specific_pool>
const&, booster::shared_ptr<cppcms::http::context> const&, std::string
const&) + 0x7e in /usr/local/lib/libcppcms.so.1#0120x7fa3e52786c3:
cppcms::impl::thread_pool::worker() + 0xc3 in
/usr/local/lib/libcppcms.so.1#0120x7fa3e566d52a: booster_thread_func +
0x1a in /usr/local/lib/libbooster.so.0#0120x7fa3e36e60a4: ??? +
0xe36e60a4 in /lib/x86_64-linux-gnu/libpthread.so.0#0120x7fa3e39e387d:
clone + 0x6d in /lib/x86_64-linux-gnu/libc.so.6#012
(http_context.cpp:336)

Sep 28 04:46:15 host1 cppcms-app: cppcms: Caught exception
[cppdb::posgresql: failed to connect: could not create socket: Too many
open files#012]#012 (http_context.cpp:336)
Sep 28 04:46:15 host1 cppcms-app: cppcms: Caught exception
[cppdb::posgresql: failed to connect: could not create socket: Too many
open files#012]#012 (http_context.cpp:336)
Sep 28 04:46:15 host1 cppcms-app: cppcms: Caught exception
[cppdb::posgresql: failed to connect: could not create socket: Too many
open files#012]#012 (http_context.cpp:336)

--------------------

lsof | grep 104.16.51.3 | wc
yields 5916 records like these:

cppcms-app      27567 27591        root 1013u     IPv4        
1052388506      0t0        TCP host1:39384->104.16.54.3:https
(CLOSE_WAIT)
cppcms-app      27567 27591        root 1014u     IPv4        
1052388558      0t0        TCP host1:39390->104.16.54.3:https
(CLOSE_WAIT)
cppcms-app      27567 27591        root 1015u     IPv4        
1052388584      0t0        TCP host1:39394->104.16.54.3:https
(CLOSE_WAIT)
cppcms-app      27567 27591        root 1016u     IPv4        
1052388586      0t0        TCP host1:39400->104.16.54.3:https
(CLOSE_WAIT)

IP 104.16.54.3 is one of CloudFlare's host.

--------------------

Process# 27567 comes from the running CppCMS program:
./cppcms-app -c my-config.js

Is it possible that CppCMS does not cleanly close files?

Best Regards,
CN

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