Date: Wed, 21 Apr 2010 18:58:26 +0100 From: Rui Paulo <rpaulo@lavabit.com> To: Alexander Best <alexbestms@wwu.de> Cc: Roman Divacky <rdivacky@FreeBSD.org>, freebsd-current@FreeBSD.org Subject: Re: [CFT]: ClangBSD is selfhosting, we need testers now Message-ID: <034542FD-3BAD-4ACA-B085-17F575409DAF@lavabit.com> In-Reply-To: <permail-201004211722001e86ffa800003aa3-a_best01@message-id.uni-muenster.de> References: <permail-201004211722001e86ffa800003aa3-a_best01@message-id.uni-muenster.de>
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On 21 Apr 2010, at 18:22, Alexander Best wrote: > Roman Divacky schrieb am 2010-04-21: >> On Wed, Apr 21, 2010 at 05:20:57PM +0200, Alexander Best wrote: >>> i might have stumbled upon a problem with clang. i've compiled a >>> kernel from >>> the clang branch using `make kernel INSTKERNNAME=clang` and booted >>> from it. >>> i'm now experiencing audio problems with mp3s and certain video >>> files. >>> playback is awfully slow and the audio output gets distorted >>> massively. `top` >>> however reports no high cpu load and `vmstat -i` doesn't report >>> anything >>> unusual either. > >>> this problem doesn't occur with a regular gcc-kernel. > >>> both kernels are running under a regular (gcc) world. > >>> i thought it might be a problem with acpi, but disabling acpi >>> (hint.acpi.0.disabled=1) gives me a system freeze. > >> I've heard about this problem but did not manage to reproduce that. > >> can you try to bisect what file is being miscompiled? ie. compile >> half of the kernel with gcc and half with clang and bisect this >> way to a single file. > >> we can work from there... > > i've identified the problem to be somewhere in sys/dev/sound. i've removed > "device sound" and "device hda_snd" from my kernel config and > rebuild/reinstalled both kernels (gcc and clang). i then booted the clang > kernel and loaded various sound.ko and snd_hda.ko combination. here're the > results: > > sound.ko (clang) snd_hda.ko (clang) => BROKEN > sound.ko (clang) snd_hda.ko (gcc) => BROKEN > sound.ko (gcc) snd_hda.ko (gcc) => OK > sound.ko (gcc) snd_hda.ko (clang) => OK > > i've attached a log documenting all clang warnings that get issued when > building sys/modules/sound. > > in addition to those warnings i get a lot of these, but i guess they aren't > harmful: > > clang: warning: argument unused during compilation: '-funroll-loops' > clang: warning: argument unused during compilation: '-finline-limit=8000' > clang: warning: argument unused during compilation: '--param > inline-unit-growth=100' > clang: warning: argument unused during compilation: '--param > large-function-growth=1000' > clang: warning: argument unused during compilation: '-mfpmath=387' > clang: warning: argument unused during compilation: '-fformat-extensions' > clang: warning: argument unused during compilation: '-funroll-loops' > clang: warning: argument unused during compilation: '-finline-limit=8000' > clang: warning: argument unused during compilation: '--param > inline-unit-growth=100' > clang: warning: argument unused during compilation: '--param > large-function-growth=1000' > clang: warning: argument unused during compilation: '-mfpmath=387' There's some assembly in feeder_rate.c. Can you check if it's being used? Regards, -- Rui Paulo
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