ig was responding to my request. Because I suspect XSUB C functions, I was looking to get a gdb bt; and here it is: 
Thread 2 (Thread 25070):
#0  0x0000000000446c34 in Perl_hv_common ()
No symbol table info available.
#1  0x0000000000447fee in Perl_hv_common_key_len ()
No symbol table info available.
#2  0x00000000004d3b3f in Perl_gv_fetchmeth ()
No symbol table info available.
#3  0x00000000004d3d32 in Perl_gv_fetchmeth ()
No symbol table info available.
#4  0x00000000004d5dae in Perl_Gv_AMupdate ()
No symbol table info available.
#5  0x00000000004613cb in Perl_sv_bless ()
No symbol table info available.
#6  0x0000000000461836 in Perl_newSVrv ()
No symbol table info available.
#7  0x0000000000468ff6 in Perl_sv_setref_pv ()
No symbol table info available.
#8  0x00007f6c0548b63e in XS_Net__SSH2__new () from /auto/share/perl/5
+.8.9/lib/site_perl/5.8.9/x86_64-linux-thread-multi/auto/Net/SSH2/SSH2
+.so
No symbol table info available.
#9  0x00000000004547fb in Perl_pp_entersub ()
No symbol table info available.
#10 0x0000000000452d06 in Perl_runops_standard ()
No symbol table info available.
#11 0x00000000004507ce in Perl_call_sv ()
No symbol table info available.
#12 0x00007f6c05aab899 in S_ithread_run () from /auto/share/perl/5.8.9
+/lib/5.8.9/x86_64-linux-thread-multi/auto/threads/threads.so
No symbol table info available.
#13 0x00007f6c0664e9ca in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#14 0x00007f6c063ab6fd in clone () from /lib/libc.so.6
No symbol table info available.
#15 0x0000000000000000 in ?? ()
No symbol table info available.

[download]
I'm not sure what to make of it yet.

In reply to Re^3: stack trace from thread exit by falan95054
in thread stack trace from thread exit by falan95054

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