Messages in this thread | | | Date | Wed, 9 Jun 2010 22:47:23 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: freeze when strace X |
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On Wed, 9 Jun 2010, Matthew Garrett wrote:
> On Wed, Jun 09, 2010 at 10:02:21PM +0200, Ortwin Glück wrote: > > On 09.06.2010 21:52, Matthew Garrett wrote: > > > Just to make sure, you're not trying to strace X from within X, are you? > > > > Oh... now that you mention it... Is that a silly thing to do? > > strace X from a different terminal works fine :-) > > > > But freezing the system because of that? I mean an error message, log, anything > > would be "nice". > > strace needs to output text via X, which generates output which needs to > be output via X... and you'll tend to deadlock. If X is holding any > interesting kernel locks at that point then it wouldn't surprise me if > the machine ends up dead.
Nothing to do with kernel locks. strace hooks into the syscall and intercepts the data, so X is stopped at that point. Now try to send output to a program which you stopped yourself :)
Thanks,
tglx | |