1

私のプログラムは、標準文字列オブジェクトを構築するときにデッドロックを取得します。これは、pstack によって生成されたコール スタック情報です。

Thread 5 (Thread 0x7efffaa02700 (LWP 3012)):
#0  0x0000003742af4e6e in __lll_lock_wait_private () from /lib64/libc.so.6
#1  0x0000003742a7bae8 in _L_lock_9164 () from /lib64/libc.so.6
#2  0x0000003742a79482 in malloc () from /lib64/libc.so.6
#3  0x000000374220cb7b in _dl_map_object_deps () from /lib64/ld-linux-x86-64.so.2
#4  0x0000003742212991 in dl_open_worker () from /lib64/ld-linux-x86-64.so.2
#5  0x000000374220e106 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#6  0x00000037422123ea in _dl_open () from /lib64/ld-linux-x86-64.so.2
#7  0x0000003742b22f80 in do_dlopen () from /lib64/libc.so.6
#8  0x000000374220e106 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#9  0x0000003742b230d7 in __libc_dlopen_mode () from /lib64/libc.so.6
#10 0x0000003742afb675 in init () from /lib64/libc.so.6
#11 0x0000003742e0cac3 in pthread_once () from /lib64/libpthread.so.0
#12 0x0000003742afb774 in backtrace () from /lib64/libc.so.6
#13 0x0000003742a6f7bb in __libc_message () from /lib64/libc.so.6
#14 0x0000003742a750c6 in malloc_printerr () from /lib64/libc.so.6
#15 0x0000003742a78b0c in _int_malloc () from /lib64/libc.so.6
#16 0x0000003742a7948d in malloc () from /lib64/libc.so.6
#17 0x00000037452bd0bd in operator new(unsigned long) () from /usr/lib64/libstdc++.so.6
#18 0x000000374529c3c9 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) () from /usr/lib64/libstdc++.so.6
#19 0x000000374529cde5 in ?? () from /usr/lib64/libstdc++.so.6
#20 0x000000374529cf33 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) () from /usr/lib64/libstdc++.so.6
#21 0x0000000000404642 in vFormat(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, __va_list_tag*) ()
#22 0x0000000000435803 in Logger::Log(int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, unsigned int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, ...) ()
#23 0x000000000042712d in StatThread::ThreadMain() ()
#24 0x000000000041e71b in BaseThread::StartThreadCallback(void*) ()
#25 0x0000003742e077f1 in start_thread () from /lib64/libpthread.so.0
#26 0x0000003742ae570d in clone () from /lib64/libc.so.6

gdb によって生成された情報、gdb -p 3012

#0  0x0000003742af4e6e in __lll_lock_wait_private () from /lib64/libc.so.6
#1  0x0000003742a7bae8 in _L_lock_9164 () from /lib64/libc.so.6
#2  0x0000003742a79482 in malloc () from /lib64/libc.so.6
#3  0x000000374220cb7b in _dl_map_object_deps () from /lib64/ld-linux-x86-64.so.2
#4  0x0000003742212991 in dl_open_worker () from /lib64/ld-linux-x86-64.so.2
#5  0x000000374220e106 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#6  0x00000037422123ea in _dl_open () from /lib64/ld-linux-x86-64.so.2
#7  0x0000003742b22f80 in do_dlopen () from /lib64/libc.so.6
#8  0x000000374220e106 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2
#9  0x0000003742b230d7 in __libc_dlopen_mode () from /lib64/libc.so.6
#10 0x0000003742afb675 in init () from /lib64/libc.so.6
#11 0x0000003742e0cac3 in pthread_once () from /lib64/libpthread.so.0
#12 0x0000003742afb774 in backtrace () from /lib64/libc.so.6
#13 0x0000003742a6f7bb in __libc_message () from /lib64/libc.so.6
#14 0x0000003742a750c6 in malloc_printerr () from /lib64/libc.so.6
#15 0x0000003742a78b0c in _int_malloc () from /lib64/libc.so.6
#16 0x0000003742a7948d in malloc () from /lib64/libc.so.6
#17 0x00000037452bd0bd in operator new(unsigned long) () from /usr/lib64/libstdc++.so.6
#18 0x000000374529c3c9 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Rep::_S_create(unsigned long, unsigned long, std::allocator<char> const&) () from /usr/lib64/libstdc++.so.6
#19 0x000000374529cde5 in ?? () from /usr/lib64/libstdc++.so.6
#20 0x000000374529cf33 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) ()
   from /usr/lib64/libstdc++.so.6
#21 0x0000000000404642 in vFormat(std::string, typedef __va_list_tag __va_list_tag *) (fmt="StatThread MsgQueue len:%u", args=0x7efffaa01bb0)
    at common.cpp:19
#22 0x0000000000435803 in Logger::Log (level=4, fileName="statthread.cpp", lineNumber=19, functionName="ThreadMain", formatString=
    "StatThread MsgQueue len:%u") at logger.cpp:107
#23 0x000000000042712d in StatThread::ThreadMain (this=0xd8c2d0) at statthread.cpp:19
#24 0x000000000041e71b in BaseThread::StartThreadCallback (data=0xd8c2d0) at basethread.h:42
#25 0x0000003742e077f1 in start_thread () from /lib64/libpthread.so.0

#26 0x0000003742ae570d in clone () from /lib64/libc.so.6

関数 vFormat は、次のように common.cpp に実装されています：</p> 

string vFormat(string fmt, va_list args) {
char *pBuffer = NULL;
if (vasprintf(&pBuffer, STR(fmt), args) == -1) {
    o_assert(false);
    return "";
}
string result = pBuffer;
free(pBuffer);
return result;
}

common.cpp の 19 行目は：</p> 

string result = pBuffer;

デッドロックはmallocが原因のようで、mallocは文字列のコンストラクタによって呼び出されます。どうすればこの問題に対処できますか、助けてくれてありがとう!

4

0 に答える 0