.
Thread 3 (Thread 0x7f4b078fb700 (LWP 9215)):
#0  0x00007f4b1aef404c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#1  0x00007f4b0c6200e9 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0
No symbol table info available.
#2  0x00007f4b0c621899 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0
No symbol table info available.
#3  0x00007f4b1aeefefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#4  0x00007f4b19d8789d in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 2 (Thread 0x7f4b08214700 (LWP 9214)):
#0  0x00007f4b1aef404c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#1  0x00007f4b0cee9202 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0
No symbol table info available.
#2  0x00007f4b0cee9229 in ?? () from /usr/lib/libwebkitgtk-3.0.so.0
No symbol table info available.
#3  0x00007f4b1aeefefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#4  0x00007f4b19d8789d in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (Thread 0x7f4b1b30a720 (LWP 9213)):
#0  0x00007f4b10d109b4 in debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator&, FileFd&, std::string) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#1  0x00007f4b10d29dde in debPackagesIndex::Merge(pkgCacheGenerator&, OpProgress*) const () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#2  0x00007f4b10cca347 in ?? () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#3  0x00007f4b10cd01db in pkgCacheGenerator::MakeStatusCache(pkgSourceList&, OpProgress*, MMap**, bool) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#4  0x00007f4b10cc3e22 in pkgCacheFile::BuildCaches(OpProgress*, bool) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#5  0x00007f4b10cc4244 in pkgCacheFile::Open(OpProgress*, bool) () from /usr/lib/libapt-pkg.so.4.11
No symbol table info available.
#6  0x00007f4b10f81f4a in ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so
No symbol table info available.
#7  0x000000000047c215 in ?? ()
No symbol table info available.
#8  0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#9  0x00000000004b6c8e in PyEval_EvalFrameEx ()
No symbol table info available.
#10 0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#11 0x00000000004b6b4b in PyEval_EvalFrameEx ()
No symbol table info available.
#12 0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#13 0x0000000000448f0f in ?? ()
No symbol table info available.
#14 0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#15 0x000000000043078e in ?? ()
No symbol table info available.
#16 0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#17 0x00000000004b6c8e in PyEval_EvalFrameEx ()
No symbol table info available.
#18 0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#19 0x0000000000448f0f in ?? ()
No symbol table info available.
#20 0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#21 0x000000000043078e in ?? ()
No symbol table info available.
#22 0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#23 0x0000000000480d63 in ?? ()
No symbol table info available.
#24 0x000000000047c2c1 in ?? ()
No symbol table info available.
#25 0x000000000041ad3a in PyObject_Call ()
No symbol table info available.
#26 0x00000000004b6c8e in PyEval_EvalFrameEx ()
No symbol table info available.
#27 0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#28 0x00000000004b6b4b in PyEval_EvalFrameEx ()
No symbol table info available.
#29 0x00000000004b6e67 in PyEval_EvalFrameEx ()
No symbol table info available.
#30 0x00000000004b6e67 in PyEval_EvalFrameEx ()
No symbol table info available.
#31 0x00000000004bce3d in PyEval_EvalCodeEx ()
No symbol table info available.
#32 0x00000000004bd922 in PyEval_EvalCode ()
No symbol table info available.
#33 0x00000000004dcd42 in ?? ()
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#34 0x00000000004dd904 in PyRun_FileExFlags ()
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#35 0x00000000004de40e in PyRun_SimpleFileExFlags ()
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#36 0x00000000004ee80d in Py_Main ()
No symbol table info available.
#37 0x00007f4b19cc730d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#38 0x000000000041cb79 in _start ()
No symbol table info available.