On 07/16/2011 10:01 AM, Benoît Delcour wrote:
lv2_jack_host http://gabe.is-a-geek.org/composite/plugins/sampler/1
URI: http://gabe.is-a-geek.org/composite/plugins/sampler/1
Plugin Name: Composite Sampler
JACK Name: Composite Sampler
Connected to JACK.
Successfully instantiated plugin.
Erreur de segmentation
I built SLV2 with debug symbols, and here's what I get for a backtrace.
Long story short: this is an SLV2 bug.
(Edited for brevity)
$ gdb /usr/bin/lv2_jack_host
(gdb) set args http://gabe.is-a-geek.org/composite/plugins/sampler/1
(gdb) run
Starting program: /usr/bin/lv2_jack_host
http://gabe.is-a-geek.org/composite/plugins/sampler/1
[Thread debugging using libthread_db enabled]
URI: http://gabe.is-a-geek.org/composite/plugins/sampler/1
Plugin Name: Composite Sampler
JACK Name: Composite Sampler
[New Thread 0xb7fdfb70 (LWP 14386)]
Connected to JACK.
[New Thread 0xb75a4b70 (LWP 14389)]
Successfully instantiated plugin.
Set volume to 1.000000
[New Thread 0xb6bffb70 (LWP 14390)]
Program received signal SIGSEGV, Segmentation fault.
0x0804937a in uri_to_id (callback_data=0x0, map=0x0, uri=0xa51980
"http://lv2plug.in/ns/ext/midi#MidiEvent";)
at ../hosts/lv2_jack_host.c:80
80 if (!strcmp(map, LV2_EVENT_URI) && !strcmp(uri,
SLV2_EVENT_CLASS_MIDI))
(gdb) bt
#0 0x0804937a in uri_to_id (callback_data=0x0, map=0x0, uri=0xa51980
"http://lv2plug.in/ns/ext/midi#MidiEvent";)
at ../hosts/lv2_jack_host.c:80
#1 0x00a4fc12 in Composite::Plugin::EngineLv2::_activate (this=0x80b5920)
at /home/gabriel/code/composite/composite/src/sampler/EngineLv2.cpp:173
#2 0x00a5028d in Composite::Plugin::EngineLv2::activate
(instance=0x80b5920)
at /home/gabriel/code/composite/composite/src/sampler/EngineLv2.cpp:77
#3 0x08049bb5 in slv2_instance_activate (argc=2, argv=0xbffff004) at
../slv2/plugininstance.h:128
#4 main (argc=2, argv=0xbffff004) at ../hosts/lv2_jack_host.c:203
(gdb) list
75 uint32_t
76 uri_to_id(LV2_URI_Map_Callback_Data callback_data,
77 const char* map,
78 const char* uri)
79 {
80 if (!strcmp(map, LV2_EVENT_URI) && !strcmp(uri,
SLV2_EVENT_CLASS_MIDI))
81 return MIDI_EVENT_ID;
82 else
83 return 0; // no id for you!
84 }
(gdb)
The docs for the uri-map extension clearly say that the `map` parameter
may be null.[1] However, if you pass a null to strcmp it will segfault.
Looks like checking for (map == 0) is the fix.
Thanks,
Gabriel
[1] http://lv2plug.in/ns/ext/uri-map/ (see uri-map.h)
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