Control: tags -1 - help Control: severity -1 important Control: retitle -1 vlc: should prevent installation on powerpc G3
Hi, On 30/10/16 00:16, Robert Ou wrote: > On Sat, Oct 29, 2016 at 3:43 PM, James Cowgill <jcowg...@debian.org> wrote: >> Control: tags -1 help >> Control: severity -1 grave >> >> Hi, >> >> On 29/10/16 23:00, Robert Ou wrote: >>> Package: src:vlc >>> Version: 2.2.4-7 >>> Severity: normal >>> >>> Dear Maintainer, >>> >>> I decided I wanted to test the performance of Debian PowerPC on my >>> ancient iMac, and I discovered that vlc will immediately crash with an >>> illegal instruction right after showing the "Privacy and Network Access >>> Policy" window and before showing the main window. The crashes look like >>> the following: >>> >>> [ 1560.952016] vlc[997]: unhandled signal 4 at 0ea48f58 nip 0ea48f58 lr >>> 0ea48f4c code 30001 >> >> As powerpc is a release architecture, this bug is RC. >> >> I tried running vlc on partch. It managed to get further, but then >> segfaulted inside QT so it's probably a separate issue. I also had to >> run it in xvfb so it probably gets different results. >> >> Specifically what powerpc hardware do you have? Could you run vlc within >> gdb to determine which instruction it SIGILLs on (try 'layout asm')? > > I was testing on a first-generation iMac with a 333 MHz PowerPC 750 > (G3). Running vlc under gdb shows that the crash occurs in > libqt4_plugin.so in QRect::adjusted. The crash occurs on a "lvx > v0,r10,r5" opcode, which is an Altivec opcode. The G3 however does not > support Altivec. Here is a backtrace and some more debug information: This explains it. From the PowerPC FAQ: https://wiki.debian.org/PowerPC/FAQ#VLC_crashes_on_startup._What.27s_up_with_that.3F " If VLC immediately crashes, it's probably because you're on a G3 and VLC was compiled with Altivec instructions. To use VLC on a G3, you must compile it with the configure option --disable-altivec. " Having said that, I think adding something to vlc's preinst to prevent installation on systems without altivec would be a good idea here. I'm not sure going through all the trouble of compiling vlc twice so it works on the G3 is worth it here - especially since powerpc may not be a release architecture in 24 hours... Thanks, James
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