Hello, I've built a flowgraph (grc, python attached) that usually (but not always) produces a segfaults in volk_32fc_x2_multiply_32fc_a_avx2_fma. The segfault occurs in the FFT filter in correlation estimator block. I'm not sure if it's the Volk code that's causing the segfault or the GR code calling it or what I'm putting into GR. I've got a back trace below if that helps.
Also, at the tag gate in my flowgraph I would usually have a USRP transmitter and a USRP receiver in a before the Correlation Estimate in a separate flowgraph but since I can re-create the segfault in the flowgraph I simplified. I'm using GR 3.7.9, Volk 1.2.1 and UHD 3.9.2 (though I don't call any UHD code here). Thanks for any help, Devin $ gdb /usr/bin/python core.13408 GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7 Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html > This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/bin/python2.7...Reading symbols from /usr/bin/python2.7...(no debugging symbols found)...done. (no debugging symbols found)...done. warning: core file may not match specified executable file. [New LWP 13431] [New LWP 13432] [New LWP 13408] [New LWP 13417] [New LWP 13424] [New LWP 13418] [New LWP 13419] [New LWP 13425] [New LWP 13426] [New LWP 13423] [New LWP 13421] [New LWP 13429] [New LWP 13428] [New LWP 13434] [New LWP 13430] [New LWP 13427] [New LWP 13433] [New LWP 13420] [New LWP 13422] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". Core was generated by `python2 ./segfault_test.py'. Program terminated with signal 11, Segmentation fault. #0 0x00007f11a4d064c0 in volk_32fc_x2_multiply_32fc_a_avx2_fma () from /local_disk/gr_3.7.9/lib/libvolk.so.1.2.1 Missing separate debuginfos, use: debuginfo-install python-2.7.5-34.el7.x86_64 (gdb) bt #0 0x00007f11a4d064c0 in volk_32fc_x2_multiply_32fc_a_avx2_fma () at /local_disk/gr_3.7.9/lib/libvolk.so.1.2.1 #1 0x00007f119c1d0006 in gr::filter::kernel::fft_filter_ccc::filter(int, std::complex<float> const*, std::complex<float>*) () at /local_disk/gr_3.7.9/lib64/libgnuradio-filter-3.7.9.so.0.0.0 #2 0x00007f119c4d724f in gr::digital::corr_est_cc_impl::work(int, std::vector<void const*, std::allocator<void const*> >&, std::vector<void*, std::allocator<void*> >&) () at /local_disk/gr_3.7.9/lib64/libgnuradio-digital-3.7.9.so.0.0.0 #3 0x00007f11a52b1f57 in gr::sync_block::general_work(int, std::vector<int, std::allocator<int> >&, std::vector<void const*, std::allocator<void const*> >&, std::vector<void*, std::allocator<void*> >&) () at /local_disk/gr_3.7.9/lib64/libgnuradio-runtime-3.7.9.so.0.0.0 #4 0x00007f11a527a6bd in gr::block_executor::run_one_iteration() () at /local_disk/gr_3.7.9/lib64/libgnuradio-runtime-3.7.9.so.0.0.0 #5 0x00007f11a52baf60 in gr::tpb_thread_body::tpb_thread_body(boost::shared_ptr<gr::block>, int) () at /local_disk/gr_3.7.9/lib64/libgnuradio-runtime-3.7.9.so.0.0.0 #6 0x00007f11a52aebc1 in boost::detail::function::void_function_obj_invoker0<gr::thread::thread_body_wrapper<gr::tpb_container>, void>::invoke(boost::detail::function::function_buffer&) () at /local_disk/gr_3.7.9/lib64/libgnuradio-runtime-3.7.9.so.0.0.0 #7 0x00007f11a5260910 in boost::detail::thread_data<boost::function0<void> >::run() () at /local_disk/gr_3.7.9/lib64/libgnuradio-runtime-3.7.9.so.0.0.0 #8 0x00007f11a40b824a in thread_proxy () at /lib64/libboost_thread-mt.so.1.53.0 #9 0x00007f11bfa38dc5 in start_thread () at /lib64/libpthread.so.0 #10 0x00007f11bf05d28d in clone () at /lib64/libc.so.6
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
##################################################
# GNU Radio Python Flow Graph
# Title: segfault_test
# Author: Devin Kelly
# Generated: Mon Mar 7 14:21:06 2016
##################################################
if __name__ == '__main__':
import ctypes
import sys
if sys.platform.startswith('linux'):
try:
x11 = ctypes.cdll.LoadLibrary('libX11.so')
x11.XInitThreads()
except:
print "Warning: failed to XInitThreads()"
from PyQt4 import Qt
from gnuradio import blocks
from gnuradio import digital
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import qtgui
from gnuradio.eng_option import eng_option
from gnuradio.filter import firdes
from gnuradio.qtgui import Range, RangeWidget
from optparse import OptionParser
import pmt
import sip
import sys
class segfault_test(gr.top_block, Qt.QWidget):
def __init__(self):
gr.top_block.__init__(self, "segfault_test")
Qt.QWidget.__init__(self)
self.setWindowTitle("segfault_test")
try:
self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
except:
pass
self.top_scroll_layout = Qt.QVBoxLayout()
self.setLayout(self.top_scroll_layout)
self.top_scroll = Qt.QScrollArea()
self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
self.top_scroll_layout.addWidget(self.top_scroll)
self.top_scroll.setWidgetResizable(True)
self.top_widget = Qt.QWidget()
self.top_scroll.setWidget(self.top_widget)
self.top_layout = Qt.QVBoxLayout(self.top_widget)
self.top_grid_layout = Qt.QGridLayout()
self.top_layout.addLayout(self.top_grid_layout)
self.settings = Qt.QSettings("GNU Radio", "segfault_test")
self.restoreGeometry(self.settings.value("geometry").toByteArray())
##################################################
# Variables
##################################################
self.sps = sps = 4
self.preamble = preamble = [1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0]
self.bpsk = bpsk = digital.constellation_calcdist(([-1, 1]), ([0, 1]), 2, 1).base()
self.samp_rate = samp_rate = 800e3
self.rxmod = rxmod = digital.generic_mod(bpsk, False, sps, True, 0.35, False, False)
self.preamble_packed = preamble_packed = [int(''.join(map(str, preamble[ii:kk])), 2) for ii, kk in zip(range(0, len(preamble), 8), range(7, len(preamble) + 8, 8))]
self.nfilts = nfilts = 32
self.access_code = access_code = [1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0]
self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts * sps, 1, 0.35, 11*sps*nfilts)
self.rf_gain = rf_gain = 20
self.preamble_packed_orig = preamble_packed_orig = [0xac, 0xdd, 0xa4, 0xe2, 0xf2, 0x8c, 0x20, 0xfc]
self.offset = offset = 1500
self.modulated_sync_word = modulated_sync_word = digital.modulate_vector_bc(rxmod .to_basic_block(), (preamble_packed), ([1]))
self.firdes_taps_highpass = firdes_taps_highpass = firdes.high_pass(1, samp_rate, 1e3, 500, firdes.WIN_BLACKMAN, 6.76)
self.fc = fc = 450e6
self.access_code_str_0 = access_code_str_0 = ''.join(map(str, access_code))
##################################################
# Blocks
##################################################
self._rf_gain_range = Range(1, 80, 1, 20, 200)
self._rf_gain_win = RangeWidget(self._rf_gain_range, self.set_rf_gain, "rf_gain", "counter_slider", float)
self.top_layout.addWidget(self._rf_gain_win)
self.qtgui_time_sink_x_0_0_0 = qtgui.time_sink_c(
5000, #size
samp_rate , #samp_rate
"", #name
1 #number of inputs
)
self.qtgui_time_sink_x_0_0_0.set_update_time(0.10)
self.qtgui_time_sink_x_0_0_0.set_y_axis(-0.05, 0.05)
self.qtgui_time_sink_x_0_0_0.set_y_label("Amplitude", "")
self.qtgui_time_sink_x_0_0_0.enable_tags(-1, True)
self.qtgui_time_sink_x_0_0_0.set_trigger_mode(qtgui.TRIG_MODE_AUTO, qtgui.TRIG_SLOPE_POS, 0.003, 0, 0, "")
self.qtgui_time_sink_x_0_0_0.enable_autoscale(False)
self.qtgui_time_sink_x_0_0_0.enable_grid(False)
self.qtgui_time_sink_x_0_0_0.enable_control_panel(False)
if not True:
self.qtgui_time_sink_x_0_0_0.disable_legend()
labels = ["", "", "", "", "",
"", "", "", "", ""]
widths = [1, 1, 1, 1, 1,
1, 1, 1, 1, 1]
colors = ["blue", "red", "green", "black", "cyan",
"magenta", "yellow", "dark red", "dark green", "blue"]
styles = [1, 1, 1, 1, 1,
1, 1, 1, 1, 1]
markers = [-1, -1, -1, -1, -1,
-1, -1, -1, -1, -1]
alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
1.0, 1.0, 1.0, 1.0, 1.0]
for i in xrange(2*1):
if len(labels[i]) == 0:
if(i % 2 == 0):
self.qtgui_time_sink_x_0_0_0.set_line_label(i, "Re{{Data {0}}}".format(i/2))
else:
self.qtgui_time_sink_x_0_0_0.set_line_label(i, "Im{{Data {0}}}".format(i/2))
else:
self.qtgui_time_sink_x_0_0_0.set_line_label(i, labels[i])
self.qtgui_time_sink_x_0_0_0.set_line_width(i, widths[i])
self.qtgui_time_sink_x_0_0_0.set_line_color(i, colors[i])
self.qtgui_time_sink_x_0_0_0.set_line_style(i, styles[i])
self.qtgui_time_sink_x_0_0_0.set_line_marker(i, markers[i])
self.qtgui_time_sink_x_0_0_0.set_line_alpha(i, alphas[i])
self._qtgui_time_sink_x_0_0_0_win = sip.wrapinstance(self.qtgui_time_sink_x_0_0_0.pyqwidget(), Qt.QWidget)
self.top_layout.addWidget(self._qtgui_time_sink_x_0_0_0_win)
self._offset_range = Range(-5000, 5000, 1, 1500, 200)
self._offset_win = RangeWidget(self._offset_range, self.set_offset, "offset", "counter_slider", int)
self.top_layout.addWidget(self._offset_win)
self._fc_range = Range(400e6, 500e6, 1e3, 450e6, 200)
self._fc_win = RangeWidget(self._fc_range, self.set_fc, "fc", "counter_slider", float)
self.top_layout.addWidget(self._fc_win)
self.digital_packet_headergenerator_bb_default_0 = digital.packet_headergenerator_bb(32, "packet_len")
self.digital_crc32_async_bb_3 = digital.crc32_async_bb(False)
self.digital_corr_est_cc_0 = digital.corr_est_cc((modulated_sync_word), sps, 1, 2)
self.digital_constellation_modulator_0 = digital.generic_mod(
constellation=bpsk,
differential=False,
samples_per_symbol=sps,
pre_diff_code=True,
excess_bw=0.35,
verbose=False,
log=False,
)
self.blocks_vector_source_x_0_0 = blocks.vector_source_b(preamble, True, 1, "")
self.blocks_tagged_stream_mux_0 = blocks.tagged_stream_mux(gr.sizeof_char*1, "packet_len", 2)
self.blocks_tagged_stream_multiply_length_0 = blocks.tagged_stream_multiply_length(gr.sizeof_gr_complex*1, "packet_len", sps)
self.blocks_tag_gate_1 = blocks.tag_gate(gr.sizeof_gr_complex * 1, False)
self.blocks_tag_debug_2 = blocks.tag_debug(gr.sizeof_gr_complex*1, "", ""); self.blocks_tag_debug_2.set_display(True)
self.blocks_stream_to_tagged_stream_0_0 = blocks.stream_to_tagged_stream(gr.sizeof_char, 1, len(preamble), "packet_len")
self.blocks_repack_bits_bb_1 = blocks.repack_bits_bb(1, 8, "", False, gr.GR_LSB_FIRST)
self.blocks_repack_bits_bb_0 = blocks.repack_bits_bb(8, 1, "packet_len", False, gr.GR_LSB_FIRST)
self.blocks_random_pdu_0 = blocks.random_pdu(10, 10, chr(0xFF), 2)
self.blocks_pdu_to_tagged_stream_0 = blocks.pdu_to_tagged_stream(blocks.byte_t, "packet_len")
##################################################
# Connections
##################################################
self.msg_connect((self.blocks_random_pdu_0, 'pdus'), (self.digital_crc32_async_bb_3, 'in'))
self.msg_connect((self.digital_crc32_async_bb_3, 'out'), (self.blocks_pdu_to_tagged_stream_0, 'pdus'))
self.connect((self.blocks_pdu_to_tagged_stream_0, 0), (self.blocks_repack_bits_bb_0, 0))
self.connect((self.blocks_repack_bits_bb_0, 0), (self.blocks_tagged_stream_mux_0, 2))
self.connect((self.blocks_repack_bits_bb_0, 0), (self.digital_packet_headergenerator_bb_default_0, 0))
self.connect((self.blocks_repack_bits_bb_1, 0), (self.digital_constellation_modulator_0, 0))
self.connect((self.blocks_stream_to_tagged_stream_0_0, 0), (self.blocks_tagged_stream_mux_0, 0))
self.connect((self.blocks_tag_gate_1, 0), (self.digital_corr_est_cc_0, 0))
self.connect((self.blocks_tagged_stream_multiply_length_0, 0), (self.blocks_tag_gate_1, 0))
self.connect((self.blocks_tagged_stream_mux_0, 0), (self.blocks_repack_bits_bb_1, 0))
self.connect((self.blocks_vector_source_x_0_0, 0), (self.blocks_stream_to_tagged_stream_0_0, 0))
self.connect((self.digital_constellation_modulator_0, 0), (self.blocks_tagged_stream_multiply_length_0, 0))
self.connect((self.digital_corr_est_cc_0, 0), (self.blocks_tag_debug_2, 0))
self.connect((self.digital_corr_est_cc_0, 0), (self.qtgui_time_sink_x_0_0_0, 0))
self.connect((self.digital_packet_headergenerator_bb_default_0, 0), (self.blocks_tagged_stream_mux_0, 1))
def closeEvent(self, event):
self.settings = Qt.QSettings("GNU Radio", "segfault_test")
self.settings.setValue("geometry", self.saveGeometry())
event.accept()
def get_sps(self):
return self.sps
def set_sps(self, sps):
self.sps = sps
self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts * self.sps, 1, 0.35, 11*self.sps*self.nfilts))
self.blocks_tagged_stream_multiply_length_0.set_scalar(self.sps)
self.set_rxmod(digital.generic_mod(self.bpsk, False, self.sps, True, 0.35, False, False))
def get_preamble(self):
return self.preamble
def set_preamble(self, preamble):
self.preamble = preamble
self.set_preamble_packed([int(''.join(map(str, self.preamble[ii:kk])), 2) for ii, kk in zip(range(0, len(self.preamble), 8), range(7, len(self.preamble) + 8, 8))])
self.blocks_stream_to_tagged_stream_0_0.set_packet_len(len(self.preamble))
self.blocks_stream_to_tagged_stream_0_0.set_packet_len_pmt(len(self.preamble))
self.blocks_vector_source_x_0_0.set_data(self.preamble, "")
def get_bpsk(self):
return self.bpsk
def set_bpsk(self, bpsk):
self.bpsk = bpsk
self.set_rxmod(digital.generic_mod(self.bpsk, False, self.sps, True, 0.35, False, False))
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.set_firdes_taps_highpass(firdes.high_pass(1, self.samp_rate, 1e3, 500, firdes.WIN_BLACKMAN, 6.76))
self.qtgui_time_sink_x_0_0_0.set_samp_rate(self.samp_rate )
def get_rxmod(self):
return self.rxmod
def set_rxmod(self, rxmod):
self.rxmod = rxmod
def get_preamble_packed(self):
return self.preamble_packed
def set_preamble_packed(self, preamble_packed):
self.preamble_packed = preamble_packed
def get_nfilts(self):
return self.nfilts
def set_nfilts(self, nfilts):
self.nfilts = nfilts
self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts * self.sps, 1, 0.35, 11*self.sps*self.nfilts))
def get_access_code(self):
return self.access_code
def set_access_code(self, access_code):
self.access_code = access_code
self.set_access_code_str_0(''.join(map(str, self.access_code)))
def get_rrc_taps(self):
return self.rrc_taps
def set_rrc_taps(self, rrc_taps):
self.rrc_taps = rrc_taps
def get_rf_gain(self):
return self.rf_gain
def set_rf_gain(self, rf_gain):
self.rf_gain = rf_gain
def get_preamble_packed_orig(self):
return self.preamble_packed_orig
def set_preamble_packed_orig(self, preamble_packed_orig):
self.preamble_packed_orig = preamble_packed_orig
def get_offset(self):
return self.offset
def set_offset(self, offset):
self.offset = offset
def get_modulated_sync_word(self):
return self.modulated_sync_word
def set_modulated_sync_word(self, modulated_sync_word):
self.modulated_sync_word = modulated_sync_word
def get_firdes_taps_highpass(self):
return self.firdes_taps_highpass
def set_firdes_taps_highpass(self, firdes_taps_highpass):
self.firdes_taps_highpass = firdes_taps_highpass
def get_fc(self):
return self.fc
def set_fc(self, fc):
self.fc = fc
def get_access_code_str_0(self):
return self.access_code_str_0
def set_access_code_str_0(self, access_code_str_0):
self.access_code_str_0 = access_code_str_0
def main(top_block_cls=segfault_test, options=None):
from distutils.version import StrictVersion
if StrictVersion(Qt.qVersion()) >= StrictVersion("4.5.0"):
style = gr.prefs().get_string('qtgui', 'style', 'raster')
Qt.QApplication.setGraphicsSystem(style)
qapp = Qt.QApplication(sys.argv)
tb = top_block_cls()
tb.start()
tb.show()
def quitting():
tb.stop()
tb.wait()
qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), quitting)
qapp.exec_()
if __name__ == '__main__':
main()
segfault_test.grc
Description: Binary data
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