(gdb) bt full
#0  0x00007ffff6542cc9 in __GI_raise (sig=sig@entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 1281
        selftid = 1281
#1  0x00007ffff65460d8 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x8905f80f68db4af,
            sa_sigaction = 0x8905f80f68db4af}, sa_mask = {__val = {
              82725800282397800, 8793920, 140737329801056, 33, 5, 0,
              140737488339840, 140733193388032, 140737326409648, 25, 56,
              140737488338479, 140737334623661, 7808768, 0, 140737329875108}},
          sa_flags = -15488, sa_restorer = 0x7fffffffbe2f}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007ffff657f394 in __libc_message (do_abort=do_abort@entry=1,
    fmt=fmt@entry=0x7ffff668db28 "*** Error in `%s': %s: 0x%s ***\n")
    at ../sysdeps/posix/libc_fatal.c:175
        ap = {{gp_offset = 40, fp_offset = 0,
            overflow_arg_area = 0x7fffffffc070,
            reg_save_area = 0x7fffffffc000}}
        fd = 12
        on_2 = <optimized out>
        list = <optimized out>
        nlist = <optimized out>
---Type <return> to continue, or q <return> to quit---
        cp = <optimized out>
        written = <optimized out>
#3  0x00007ffff658a0f7 in malloc_printerr (action=<optimized out>,
    str=0x7ffff668def0 "malloc(): smallbin double linked list corrupted",
    ptr=<optimized out>) at malloc.c:4996
        buf = "0000000000863100"
        cp = <optimized out>
#4  0x00007ffff658ce04 in _int_malloc (av=0x7ffff68ca760 <main_arena>,
    bytes=40) at malloc.c:3359
        p = 0x0
        fb = <optimized out>
        pp = <optimized out>
        nb = 48
        idx = <optimized out>
        bin = <optimized out>
        victim = <optimized out>
        size = <optimized out>
        victim_index = <optimized out>
        remainder = <optimized out>
        remainder_size = <optimized out>
        block = <optimized out>
        bit = <optimized out>
        map = <optimized out>
        fwd = <optimized out>
---Type <return> to continue, or q <return> to quit---
        bck = <optimized out>
        errstr = <optimized out>
        __func__ = "_int_malloc"
#5  0x00007ffff658e7b0 in __GI___libc_malloc (bytes=40) at malloc.c:2891
        ar_ptr = 0x7ffff68ca760 <main_arena>
        victim = 0x6
        __func__ = "__libc_malloc"
#6  0x00007ffff6d63dad in operator new(unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#7  0x00000000004a699a in std::pair<std::_Rb_tree_iterator<CString>, bool> std::_Rb_tree<CString, CString, std::_Identity<CString>, std::less<CString>, std::allocator<CString> >::_M_insert_unique<CString>(CString&&) ()
No symbol table info available.
#8  0x000000000051b7bd in CSockManager::SetTDNSThreadFinished(CSockManager::TDNSTask*, bool, addrinfo*) ()
No symbol table info available.
#9  0x000000000051c723 in CSockManager::CDNSJob::runMain() ()
No symbol table info available.
#10 0x00000000005344f2 in CThreadPool::handlePipeReadable() const ()
No symbol table info available.
#11 0x000000000051cbd2 in CSockManager::CTDNSMonitorFD::FDsThatTriggered(std::map<int, short, std::less<int>, std::allocator<std::pair<int const, short> > > const&) ()
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#12 0x000000000044ba40 in CSMonitorFD::CheckFDs(std::map<int, short, std::less<int>, std::allocator<std::pair<int const, short> > > const&) ()
No symbol table info available.
#13 0x00000000004493a6 in CSockCommon::CheckFDs(std::map<int, short, std::less<int>, std::allocator<std::pair<int const, short> > > const&) ()
No symbol table info available.
#14 0x000000000044a739 in CSocketManager::Select(std::map<Csock*, CSocketManager::EMessages, std::less<Csock*>, std::allocator<std::pair<Csock* const, CSocketManager::EMessages> > >&) ()
No symbol table info available.
#15 0x000000000044b170 in CSocketManager::Loop() ()
No symbol table info available.
#16 0x00000000004492d1 in CSocketManager::DynamicSelectLoop(unsigned long, unsigned long, long) ()
No symbol table info available.
#17 0x000000000045c4b0 in CZNC::Loop() ()
No symbol table info available.
#18 0x0000000000431269 in main ()
No symbol table info available.
(gdb)