kern/146031: [snd_hda] race condition when kldunload snd_hda
gcooper at FreeBSD.org
Sun Apr 25 23:40:04 UTC 2010
The following reply was made to PR kern/146031; it has been noted by GNATS.
From: Garrett Cooper <gcooper at FreeBSD.org>
To: Alexander Best <alexbestms at wwu.de>
Cc: bug-followup at freebsd.org
Subject: Re: kern/146031: [snd_hda] race condition when kldunload snd_hda
Date: Sun, 25 Apr 2010 16:31:24 -0700
On Sun, Apr 25, 2010 at 4:26 AM, Alexander Best <alexbestms at wwu.de> wrote:
> sh -c 'i=1; while [ 1 ] ; do echo "Try $i"; kldload snd_hda; kldunload snd_hda
> sound; : $(( i += 1 )); done'
> complains about sound.ko not being loaded, since unloading snd_hda.ko also
> unloads sound.ko. is this what you got too?
> i'm not sure this logic is correct. loading snd_hda.ko also loads sound.ko,
> since it depends on it. however i don't see why unloading snd_hda.ko also
> unloads sound.ko, since sound.ko has no dependencies and can exist without any
> snd_*.ko module.
> i wasn't able to trigger the panic however (command cancelled with i=350 or
> i'm running 9-CURRENT (r207154).
1. How many cores and processors does your machine have?
2. Do you have SMP enabled?
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