#272: altivec specific code segfaults on ppc when compiled with --enable-pic ----------------------+-------------------------- Reporter: kim | Type: defect Status: new | Priority: normal Component: avcodec | Version: unspecified Keywords: ppc, PIC | Blocked By: Blocking: | Reproduced: 0 Analyzed: 0 | ----------------------+-------------------------- When compiled with --enable-pic, ffplay segfault when using code in libavcodec/ppc/fft_altivec_s.S on various files. For instance when decoding aac or ac3 audio streams. This is always reproducible and do not happen when disabling pic (the default):
Tested with latest git (47d2ca3205b53665328fe301879c339449db7a1d) but this has been the case for a long time I believe, I started remarking this when upgrading from mythtv 0.23 to 0.24, several months ago. from master: ./configure --enable-pic make gdb ./ffplay_g ~myth/aac.dump Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x493b5460 (LWP 32531)] 0x10361e3c in ff_fft_calc_altivec () at libavcodec/ppc/fft_altivec_s.S:447 447 DECL_FFTS 0 Full gdb output attached (with bt, disass and register dump) attached. I believe the cause of the crash to be the loading of a global symbol in a non pic compatible way. Just doing ./configure and make, the file plays normally. -- Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/272> FFmpeg <http://ffmpeg.org> FFmpeg issue tracker _______________________________________________ FFmpeg-trac mailing list FFmpeg-trac@avcodec.org http://avcodec.org/mailman/listinfo/ffmpeg-trac