[Qemu-devel] [Bug 1776478] Re: Getting qemu: uncaught target signal 6 when running lv2 plugin cross-compilation

[guysoft]

Ok, got it to run with (had to septate arguments with --):

sudo chroot . usr/bin/qemu-arm-static -g -- DISTRHO-
Ports/libs/lv2_ttl_generator DISTRHO-Ports/bin/lv2/TAL-Filter-2.lv2/TAL-
Filter-2.so

When running I can see two processes:

root     31993  0.0  0.0  86556  4696 pts/9    S+   15:06   0:00 sudo chroot . 
usr/bin/qemu-arm-static -g -- DISTRHO-Ports/libs/lv2_ttl_generator 
DISTRHO-Ports/bin/lv2/TAL-Filter-2.lv2/TAL-Filter-2.so
root     31994  0.0  0.0 4240444 9592 pts/9    Rl+  15:06   0:00 
usr/bin/qemu-arm-static -g -- DISTRHO-Ports/libs/lv2_ttl_generator 
DISTRHO-Ports/bin/lv2/TAL-Filter-2.lv2/TAL-Filter-2.so


I can attach to the pid using something like this:

sudo gdb -p $(ps aux | grep usr/bin/qemu-arm-static | grep -v grep |
grep -v chroot | awk '{  print $2 }')


When I continue I get:
Attaching to process 32519
[New LWP 32520]
0x00000000607a0973 in ?? ()
(gdb) c
Continuing.

Thread 1 "qemu-arm-static" received signal SIGABRT, Aborted.
0x00000000601786cd in ?? ()


The other process I can get with removing "-v" chroot so:

...

sudo gdb -p $(ps aux | grep usr/bin/qemu-arm-static | grep -v grep |
grep chroot | awk '{  print $2 }')

Reading symbols from /lib/x86_64-linux-gnu/libsystemd.so.0...(no debugging 
symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/liblzma.so.5...(no debugging symbols 
found)...done.
Reading symbols from /usr/lib/x86_64-linux-gnu/liblz4.so.1...(no debugging 
symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libgcrypt.so.20...(no debugging 
symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libgpg-error.so.0...(no debugging 
symbols found)...done.
0x00007f65cfd51bc4 in __GI___poll (fds=0x560bc6fe3040, nfds=2, timeout=-1) at 
../sysdeps/unix/sysv/linux/poll.c:29
29      ../sysdeps/unix/sysv/linux/poll.c: No such file or directory.
(gdb) 


I think the first one is the interesting run, but being verbose.

Any tips on adding symbols?

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https://bugs.launchpad.net/bugs/1776478

Title:
  Getting qemu: uncaught target signal 6 when running  lv2 plugin cross-
  compilation

Status in QEMU:
  New

Bug description:
  Hey,
  I am part of the Zynthian team and we use qemu-arm-static to cross compile 
lv2 audio plugins.

  When running a compilation of DISTRHO-Ports we get:

  lv2_ttl_generator: pthread_mutex_lock.c:81: __pthread_mutex_lock: Assertion 
`mutex->__data.__owner == 0' failed.
  qemu: uncaught target signal 6 (Aborted) - core dumped
  ./scripts/generate-ttl.sh: line 27: 16524 Aborted                 $GEN ./$FILE
  Makefile:62: recipe for target 'gen_lv2' failed
  make[1]: *** [gen_lv2] Error 134
  make[1]: Leaving directory '/home/pi/zynthian-sw/plugins/DISTRHO-Ports'
  Makefile:104: recipe for target 'lv2' failed
  make: *** [lv2] Error 2

  
  lv2_ttl_generator source is here:
  https://github.com/DISTRHO/DISTRHO-Ports/tree/master/libs/lv2-ttl-generator

  The command that is ruining is
  lv2_ttl_generator ./TAL-Filter-2.so 

  And ./TAL-Filter-2.so source is here:
  https://github.com/DISTRHO/DISTRHO-Ports/tree/master/ports/tal-filter-2/source


  Is there a way to debug what is going on?
  This runs fine on a Raspberrypi which is armv7

  A workaround would also help.

  
  Bug in Zynthian:
  https://github.com/zynthian/zynthian-sys/issues/59
  Bug in DISTRHO-Ports:
  https://github.com/DISTRHO/DISTRHO-Ports/issues/29

  Using qemu-arm-static version from master from two days ago:
  qemu-arm version 2.12.50 (v2.12.0-1182-ga7a7309ca5-dirty), commit: 
a7a7309ca52c327c6603d60db90ae4feeae719f7

  Also saw this in qemu-arm version 2.12.0 (Debian 1:2.12+dfsg-3)

  Thanks,
  Guy

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