From: Timothy Arceri Date: Thu, 23 Feb 2017 03:42:07 +0000 (+1100) Subject: st/mesa: fix crash in shader cache cased by race condition X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c24d0aaa9a197ccf7cbaa9154b840aed6397f6bd;p=mesa.git st/mesa: fix crash in shader cache cased by race condition If a thread doesn't load GLSL IR from cache but does load TGSI from cache (that was created by another thread) than it will crash due to expecting gl_program_parameter_list to have been restored from the GLSL IR cache and not be null. Reviewed-by: Edward O'Callaghan Tested-by: Michel Dänzer --- diff --git a/src/mesa/state_tracker/st_shader_cache.c b/src/mesa/state_tracker/st_shader_cache.c index 607e5b10766..eb66f999a5b 100644 --- a/src/mesa/state_tracker/st_shader_cache.c +++ b/src/mesa/state_tracker/st_shader_cache.c @@ -233,6 +233,14 @@ st_load_tgsi_from_disk_cache(struct gl_context *ctx, ralloc_free(buf); } + /* Now that we have created the sha1 keys that will be used for writting to + * the tgsi cache fallback to the regular glsl to tgsi path if we didn't + * load the GLSL IR from cache. We do this as glsl to tgsi can alter things + * such as gl_program_parameter_list which holds things like uniforms. + */ + if (prog->data->LinkStatus != linking_skipped) + return false; + struct st_context *st = st_context(ctx); for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) { if (prog->_LinkedShaders[i] == NULL) @@ -389,12 +397,6 @@ st_load_tgsi_from_disk_cache(struct gl_context *ctx, fallback_recompile: - /* GLSL IR was compiled and linked so just fallback to the regular - * glsl to tgsi path. - */ - if (prog->data->LinkStatus != linking_skipped) - return false; - for (unsigned i = 0; i < prog->NumShaders; i++) { _mesa_glsl_compile_shader(ctx, prog->Shaders[i], false, false, true); }