Re: Hard lockups running X with 2.5.38-bk4, -bk5 and -mm3

[Andrew Morton]

Steven Cole wrote:
> 
> I only recently started testing 2.5.x kernels with X, and have
> immediately run into problems.
> 
> My new test system is a Dell GX110 single PIII, IDE (Intel 82801AA IDE),
> 256MB memory.  The 2.5.38-bk4,5 and -mm3 kernels were SMP (due to
> not having Rusty's cpu_possible fix), non-PREEMPT.
> 
> Running XFree86 4.2.1, I get a hard lockup with the box not responsive
> to pings.  Ssh sessions don't respond and the pointer does not respond
> to mouse movements.  This occurs very soon (2-3 minutes) after starting
> X with 2.5.38-bk4 and -bk5.  I was able to run 2.5.38-mm3 for about 30
> minutes under load (kernel compiles) before a freeze occurred.  I ran
> 2.5.38-mm3 again for about 20 minutes with X and under load before a
> second lockup occurred.  Sorry, nothing logged, and when the freezes
> occur, there is no response to SYSRQ-H,S or B.  SYSRQ-H works as
> expected before the freeze.
> 
> Without running X on this system, no freezes have been observed with any
> of these kernels with the system loaded by running kernel compiles and
> dbench with up to 40 clients.
> 

Me too.  deadlocks on tasklist_lock.  Some fixes went into Linus's
tree a few hours ago, so please retest.