[srslte-users] srsLTE/srsUE with Commercial Cell => Segmentation Fault

Ismael Gomez ismael.gomez at softwareradiosystems.com
Tue Nov 29 10:51:38 UTC 2016


Hi,

Yes it looks like this is some problem with the UHD IO. Have you tried
running a the UHD benchmark IO tool?

BR
Ismael

On Tue, 29 Nov 2016 at 11:43 David Rupprecht <david.rupprecht at rub.de> wrote:

> Dear all,
>
> I try to connect srsUE with a commercial cell in Germany (100 PRB).
> Unfortunately, srsUE breaks while setting up a radio connection with:
>
> Error sending to UHD: 30
> Error sending to UHD: 30
> Random Access Transmission: seq=1, ra-rnti=2
> Error sending to UHD: 30
> Error sending to UHD: 30
> Error sending to UHD: 30
> Random Access Transmission: seq=2, ra-rnti=2
> Sync error.
> Segmentation fault (core dumped)
>
> Because of the seg fault, srsUE does not provide any log file.
> Looking in the core dump, showes it always fails when calling
> srsue::phch_common::reset_ul. My guess is that it tries to unlock a
> mutex which is not locked (_xend () at
> ../sysdeps/unix/sysv/linux/x86/elision-unlock.c:33). However, looking
> the mutex before does not help any further as it can not lock the mutex.
>
> void phch_common::reset_ul()
> {
>   for (int i=0;i<nof_mutex;i++) {
>     pthread_mutex_lock(&tx_mutex[i]);
>   }
>   is_first_tx = true;
>   is_first_of_burst = true;
>   for (int i=0;i<nof_mutex;i++) {
>     pthread_mutex_unlock(&tx_mutex[i]);
>   }
> }
>
>
> Do you have any suggestions how I can fix the issue of Segfault, Sync
> error, and UHD IO error?
>
> Best regards,
> David
> --
> M.Sc. David Rupprecht
>
> Ruhr-University Bochum
> Research Group Information Security
> Universit├Ątsstra├če 150
> ID 2/130
> 44780 Bochum / Germany
>
> Phone: +49 234 / 32 - 23508 <+49%20234%203223508>
> Web: www.infsec.rub.de
> _______________________________________________
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