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IDCategoryLast Update
0007812bugs2019-09-20 02:13
ReporternstewartAssigned To 
Reproducibilityalways 
Status newResolutionopen 
Platformx86_64OSUbuntu LinuxOS Version18.04
Product Version5.12 
Fixed in Version 
Summary0007812: Crash in ../libs/backends/alsa/alsa_audiobackend.cc:1955
DescriptionCrash in libalsa_audiobackend.so
Steps To ReproduceIt seems to be not difficult to repro, though I haven't got the exact minimum sequence down.
So, if I start Ardour in Alsa mode, with my UMC1820 audio interface and Alsa raw devices for Midi, I dont' see my AMT8 interface.
If I change MIDI to None, then back to Alsa Raw, then go to MIDI Device Setup, I see the Broadcast plus MIDI 1-8 interfaces.

rgareus: nstewart: how about ALSA-sequencer?
nstewart: If I try to detect latency on MIDI IO8, they come up with only system:midi_capture1 and system:midi playback 1, not any of the 8 I expected to see. Try to detect latency, then try it again and it'll crash
Additional Information#0 0x0000559604277840 in ()
0000001 0x00007fe3cbdb45b8 in ARDOUR::AlsaAudioBackend::main_process_thread() (this=0x559603697d20) at ../libs/backends/alsa/alsa_audiobackend.cc:1955
#2 0x00007fe3cbdaeab0 in pthread_process(void*) (arg=0x559603697d20) at ../libs/backends/alsa/alsa_audiobackend.cc:796

rgareus: that sounds like a midi-device is n/a
nstewart: an actual device or an interface?
rgareus: can't say
rgareus: the fact that devices differ when you change to None and back to Raw. is already odd
rgareus: the crash happens in /* de-queue incoming midi*/

[ 2993.842541] ardour-5.12.0[13540]: segfault at 7fc4758c1fc0 ip 00007fc4758c1fc0 sp 00007fc44aae80e8 error 15 in libalsa_audiobackend.so[7fc4758c1000+2000]
[ 2993.842551] Code: 00 00 f8 27 19 90 c4 7f 00 00 f0 b9 2b 77 c5 55 00 00 83 83 6a 75 c4 7f 00 00 00 00 00 00 00 00 00 00 60 21 8c 75 c4 7f 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0 b8 ea 8f c4 7f
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Issue History

Date Modified Username Field Change
2019-09-20 02:13 nstewart New Issue