[srslte-users] Segfault in channel estimation?

[Ismael Gomez]

Hi Enes,

That's an strange error. Specially if before it was working ok. Does it
segfault with 20 MHz bw only or also with others?

On Tue, 12 Jul 2016 at 11:00 Enes ÜNAL <aenesunal at gmail.com> wrote:

> Hello again,
>
> I have a problem with srsLTE. When I tried to run srsUE, there is a
> segmentation fault in channel estimation, specifically while doing
> convolution.
>
> What may be the problem? I changed my CPU and OS. Before the changes, it
> was working find.
>
> Old OS, CPU: Ubuntu 16.04LTS, Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz
> New OS, CPU: OpenSuSE 42.1, Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
>
> Here the stack trace and srsUE logs:
>
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x00007f8c0771d08a in srslte_conv_same_cf (input=0x7f8bd830a2c0,
> filter=filter at entry=0x7f8c0b26e4c4, output=0x7f8b00000000,
>     input_len=input_len at entry=200, filter_len=3) at
> /root/srsLTE/srslte/lib/utils/convolution.c:158
> 158    output[i]=srslte_vec_dot_prod_cfc(&first[i],filter,M);
> (gdb) where
> #0  0x00007f8c0771d08a in srslte_conv_same_cf (input=0x7f8bd830a2c0,
> filter=filter at entry=0x7f8c0b26e4c4, output=0x7f8b00000000,
>     input_len=input_len at entry=200, filter_len=3) at
> /root/srsLTE/srslte/lib/utils/convolution.c:158
> #1  0x00007f8c076f3584 in average_pilots (port_id=0,
> output=0x7f8b00000000, input=0x7f8bd830a2c0, q=0x7f8c0b26e3c0)
>     at /root/srsLTE/srslte/lib/ch_estimation/chest_dl.c:297
> #2  srslte_chest_dl_estimate_port (q=q at entry=0x7f8c0b26e3c0,
> input=input at entry=0x7f8bd887d280, ce=0x7f8bd889dfe0, sf_idx=sf_idx at entry
> =5,
>     port_id=port_id at entry=0) at
> /root/srsLTE/srslte/lib/ch_estimation/chest_dl.c:327
> #3  0x00007f8c076f397b in srslte_chest_dl_estimate (q=q at entry=0x7f8c0b26e3c0,
> input=0x7f8bd887d280, ce=ce at entry=0x7f8c0b26edc0,
>     sf_idx=sf_idx at entry=5) at
> /root/srsLTE/srslte/lib/ch_estimation/chest_dl.c:361
> #4  0x00007f8c07728021 in srslte_ue_dl_decode_estimate (q=0x7f8c0b2620f8,
> sf_idx=5, cfi=0x7f8c0b26ee40) at /root/srsLTE/srslte/lib/ue/ue_dl.c:216
> #5  0x00000000004604e1 in lns::phch_worker::extract_fft_and_pdcch_llr() ()
> #6  0x0000000000464826 in lns::phch_worker::work_imp() ()
> #7  0x00000000004789b1 in srslte::thread_pool::worker::run_thread() ()
> #8  0x0000000000457f79 in thread::thread_function_entry(void*) ()
> #9  0x00007f8c0aec80a4 in start_thread () from /lib64/libpthread.so.0
> #10 0x00007f8c06b8004d in clone () from /lib64/libc.so.6
>
> ------------------------------------------------------------
> ------------------------------
> Opening USRP with args: serial=30B2A7D
> -- Detected Device: B200mini
> -- Operating over USB 3.
> -- Initialize CODEC control...
> -- Initialize Radio control...
> -- Performing register loopback test... pass
> -- Performing CODEC loopback test... pass
> -- Setting master clock rate selection to 'automatic'.
> -- Asking for clock rate 16.000000 MHz...
> -- Actually got clock rate 16.000000 MHz.
> -- Performing timer loopback test... pass
> -- Asking for clock rate 32.000000 MHz...
> -- Actually got clock rate 32.000000 MHz.
> -- Performing timer loopback test... pass
> Setting frequency: DL=1830.0 Mhz, UL=800.0 MHz
> MIB received BW=20 MHz
> Initializating cell configuration...
> Setting Sampling frequency 23.04 MHz
> Segmentation fault (core dumped)
>
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