swebb2066 commented on issue #429:
URL:
https://github.com/apache/logging-log4cxx/issues/429#issuecomment-2484568633
It seems the bug was somewhat accidently fixed by associating the socket
with a different APR memory pool. In the current version the socket is closed
by APR as a part of a memory pool cleanup. The stack from the current version
at the call to connect and the subsequent call to close is as follows:
```
Breakpoint 1, __libc_connect (fd=3, addr=..., len=16) at
../sysdeps/unix/sysv/linux/connect.c:24
24 ../sysdeps/unix/sysv/linux/connect.c: No such file or directory.
(gdb) bt
#0 __libc_connect (fd=3, addr=..., len=16) at
../sysdeps/unix/sysv/linux/connect.c:24
#1 0x00005555556ed509 in apr_socket_connect ()
#2 0x00005555556d255b in log4cxx::helpers::APRSocket::APRSocket
(this=0x555555818fe0, address=std::shared_ptr<log4cxx::helpers::InetAddress>
(use count 2, weak count 0) = {...}, port=1234)
at /home/stephen/source/logging-log4cxx/src/main/cpp/aprsocket.cpp:73
#3 0x00005555556d1ae1 in std::make_unique<log4cxx::helpers::APRSocket,
std::shared_ptr<log4cxx::helpers::InetAddress>&, int&> () at
/usr/include/c++/11/bits/unique_ptr.h:962
#4 0x00005555556d1627 in log4cxx::helpers::Socket::create
(address=std::shared_ptr<log4cxx::helpers::InetAddress> (use count 2, weak
count 0) = {...}, port=1234) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socket.cpp:49
#5 0x000055555569329a in log4cxx::net::SocketAppenderSkeleton::connect
(this=0x555555818f80, p=...) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socketappenderskeleton.cpp:96
#6 0x0000555555692fae in
log4cxx::net::SocketAppenderSkeleton::activateOptions (this=0x555555818f80,
p=...) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socketappenderskeleton.cpp:66
#7 0x00005555555d2d20 in log4cxx::net::XMLSocketAppender::XMLSocketAppender
(this=0x555555818f80, host="localhost", port1=1234, __in_chrg=<optimised out>,
__vtt_parm=<optimised out>)
at
/home/stephen/source/logging-log4cxx/src/main/cpp/xmlsocketappender.cpp:82
#8 0x000055555558c7ad in std::construct_at<log4cxx::net::XMLSocketAppender,
char const (&) [10], int> (__location=0x555555818f80) at
/usr/include/c++/11/bits/stl_construct.h:97
#9 0x000055555558c879 in
std::allocator_traits<std::allocator<log4cxx::net::XMLSocketAppender>
>::construct<log4cxx::net::XMLSocketAppender, char const (&) [10], int>
(__a=..., __p=0x555555818f80)
at /usr/include/c++/11/bits/alloc_traits.h:518
#10 0x000055555558c2af in
std::_Sp_counted_ptr_inplace<log4cxx::net::XMLSocketAppender,
std::allocator<log4cxx::net::XMLSocketAppender>,
(__gnu_cxx::_Lock_policy)2>::_Sp_counted_ptr_inplace<char const (&) [10], int> (
this=0x555555818f70, __a=...) at
/usr/include/c++/11/bits/shared_ptr_base.h:519
#11 0x000055555558bd93 in
std::__shared_count<(__gnu_cxx::_Lock_policy)2>::__shared_count<log4cxx::net::XMLSocketAppender,
std::allocator<log4cxx::net::XMLSocketAppender>, char const (&) [10], int>
(this=0x7fffffffe208,
__p=@0x7fffffffe200: 0x0, __a=...) at
/usr/include/c++/11/bits/shared_ptr_base.h:650
#12 0x000055555558bb28 in std::__shared_ptr<log4cxx::net::XMLSocketAppender,
(__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<log4cxx::net::XMLSocketAppender>,
char const (&) [10], int> (this=0x7fffffffe200, __tag=...)
at /usr/include/c++/11/bits/shared_ptr_base.h:1342
#13 0x000055555558b7fd in
std::shared_ptr<log4cxx::net::XMLSocketAppender>::shared_ptr<std::allocator<log4cxx::net::XMLSocketAppender>,
char const (&) [10], int> (this=0x7fffffffe200, __tag=...)
at /usr/include/c++/11/bits/shared_ptr.h:409
#14 0x000055555558b2eb in
std::allocate_shared<log4cxx::net::XMLSocketAppender,
std::allocator<log4cxx::net::XMLSocketAppender>, char const (&) [10], int>
(__a=...) at /usr/include/c++/11/bits/shared_ptr.h:863
#15 0x000055555558a8e1 in std::make_shared<log4cxx::net::XMLSocketAppender,
char const (&) [10], int> () at /usr/include/c++/11/bits/shared_ptr.h:879
#16 0x0000555555589e8a in main (argc=1, argv=0x7fffffffe3a8) at
/home/stephen/source/logging-log4cxx/src/examples/cpp/testSocketAppender.cpp:9
(gdb) c
Continuing.
Breakpoint 2, __GI___close (fd=3) at ../sysdeps/unix/sysv/linux/close.c:26
26 ../sysdeps/unix/sysv/linux/close.c: No such file or directory.
(gdb) bt
#0 __GI___close (fd=3) at ../sysdeps/unix/sysv/linux/close.c:26
#1 0x00005555556eca29 in socket_cleanup ()
#2 0x00005555556e946f in run_cleanups ()
#3 0x00005555556e82a6 in apr_pool_destroy ()
#4 0x00005555555bf5c7 in log4cxx::helpers::Pool::~Pool
(this=0x55555581b6e0, __in_chrg=<optimised out>) at
/home/stephen/source/logging-log4cxx/src/main/cpp/pool.cpp:46
#5 0x00005555556d315c in
log4cxx::helpers::APRSocket::APRSocketPriv::~APRSocketPriv
(this=0x55555581b6c0, __in_chrg=<optimised out>) at
/home/stephen/source/logging-log4cxx/src/main/cpp/aprsocket.cpp:31
#6 0x00005555556d3188 in
log4cxx::helpers::APRSocket::APRSocketPriv::~APRSocketPriv
(this=0x55555581b6c0, __in_chrg=<optimised out>) at
/home/stephen/source/logging-log4cxx/src/main/cpp/aprsocket.cpp:31
#7 0x00005555556d1cc2 in
std::default_delete<log4cxx::helpers::Socket::SocketPrivate>::operator()
(this=0x555555818fe8, __ptr=0x55555581b6c0) at
/usr/include/c++/11/bits/unique_ptr.h:85
#8 0x00005555556d1a5e in
std::unique_ptr<log4cxx::helpers::Socket::SocketPrivate,
std::default_delete<log4cxx::helpers::Socket::SocketPrivate> >::~unique_ptr
(this=0x555555818fe8, __in_chrg=<optimised out>)
at /usr/include/c++/11/bits/unique_ptr.h:361
#9 0x00005555556d1546 in log4cxx::helpers::Socket::~Socket
(this=0x555555818fe0, __in_chrg=<optimised out>) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socket.cpp:36
#10 0x00005555556d2665 in log4cxx::helpers::APRSocket::APRSocket
(this=0x555555818fe0, address=std::shared_ptr<log4cxx::helpers::InetAddress>
(use count 2, weak count 0) = {...}, port=1234)
at /home/stephen/source/logging-log4cxx/src/main/cpp/aprsocket.cpp:79
#11 0x00005555556d1ae1 in std::make_unique<log4cxx::helpers::APRSocket,
std::shared_ptr<log4cxx::helpers::InetAddress>&, int&> () at
/usr/include/c++/11/bits/unique_ptr.h:962
#12 0x00005555556d1627 in log4cxx::helpers::Socket::create
(address=std::shared_ptr<log4cxx::helpers::InetAddress> (use count 2, weak
count 0) = {...}, port=1234) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socket.cpp:49
#13 0x000055555569329a in log4cxx::net::SocketAppenderSkeleton::connect
(this=0x555555818f80, p=...) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socketappenderskeleton.cpp:96
#14 0x0000555555692fae in
log4cxx::net::SocketAppenderSkeleton::activateOptions (this=0x555555818f80,
p=...) at
/home/stephen/source/logging-log4cxx/src/main/cpp/socketappenderskeleton.cpp:66
#15 0x00005555555d2d20 in log4cxx::net::XMLSocketAppender::XMLSocketAppender
(this=0x555555818f80, host="localhost", port1=1234, __in_chrg=<optimised out>,
__vtt_parm=<optimised out>)
at
/home/stephen/source/logging-log4cxx/src/main/cpp/xmlsocketappender.cpp:82
#16 0x000055555558c7ad in std::construct_at<log4cxx::net::XMLSocketAppender,
char const (&) [10], int> (__location=0x555555818f80) at
/usr/include/c++/11/bits/stl_construct.h:97
#17 0x000055555558c879 in
std::allocator_traits<std::allocator<log4cxx::net::XMLSocketAppender>
>::construct<log4cxx::net::XMLSocketAppender, char const (&) [10], int>
(__a=..., __p=0x555555818f80)
at /usr/include/c++/11/bits/alloc_traits.h:518
#18 0x000055555558c2af in
std::_Sp_counted_ptr_inplace<log4cxx::net::XMLSocketAppender,
std::allocator<log4cxx::net::XMLSocketAppender>,
(__gnu_cxx::_Lock_policy)2>::_Sp_counted_ptr_inplace<char const (&) [10], int> (
this=0x555555818f70, __a=...) at
/usr/include/c++/11/bits/shared_ptr_base.h:519
#19 0x000055555558bd93 in
std::__shared_count<(__gnu_cxx::_Lock_policy)2>::__shared_count<log4cxx::net::XMLSocketAppender,
std::allocator<log4cxx::net::XMLSocketAppender>, char const (&) [10], int>
(this=0x7fffffffe208,
__p=@0x7fffffffe200: 0x0, __a=...) at
/usr/include/c++/11/bits/shared_ptr_base.h:650
#20 0x000055555558bb28 in std::__shared_ptr<log4cxx::net::XMLSocketAppender,
(__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<log4cxx::net::XMLSocketAppender>,
char const (&) [10], int> (this=0x7fffffffe200, __tag=...)
at /usr/include/c++/11/bits/shared_ptr_base.h:1342
#21 0x000055555558b7fd in
std::shared_ptr<log4cxx::net::XMLSocketAppender>::shared_ptr<std::allocator<log4cxx::net::XMLSocketAppender>,
char const (&) [10], int> (this=0x7fffffffe200, __tag=...)
at /usr/include/c++/11/bits/shared_ptr.h:409
#22 0x000055555558b2eb in
std::allocate_shared<log4cxx::net::XMLSocketAppender,
std::allocator<log4cxx::net::XMLSocketAppender>, char const (&) [10], int>
(__a=...) at /usr/include/c++/11/bits/shared_ptr.h:863
#23 0x000055555558a8e1 in std::make_shared<log4cxx::net::XMLSocketAppender,
char const (&) [10], int> () at /usr/include/c++/11/bits/shared_ptr.h:879
#24 0x0000555555589e8a in main (argc=1, argv=0x7fffffffe3a8) at
/home/stephen/source/logging-log4cxx/src/examples/cpp/testSocketAppender.cpp:9
(gdb)
```
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