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List:       linux-next
Subject:    Re: linux-next: boot failure after merge of the tip tree
From:       Ingo Molnar <mingo () kernel ! org>
Date:       2023-05-26 8:50:50
Message-ID: ZHBy6hkfQze53pOS () gmail ! com
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* Peter Zijlstra <peterz@infradead.org> wrote:

> On Wed, May 24, 2023 at 03:44:59PM +1000, Stephen Rothwell wrote:
> > Hi all,
> > 
> > After merging the tip tree, today's linux-next build (powerpc
> > pseries_le_defconfig) failed to boot like this:
> > 
> > Built 1 zonelists, mobility grouping on.  Total pages: 32736
> > Policy zone: Normal
> > mem auto-init: stack:all(zero), heap alloc:off, heap free:off
> > Memory: 2027392K/2097152K available (17984K kernel code, 3328K rwdata, 14784K \
> > rodata, 6080K init, 1671K bss, 69760K reserved, 0K cma-reserved) 
> > *crickets*
> > 
> > Bisected to commit
> > 
> > f4ab23558310 ("slub: Replace cmpxchg_double()")
> > 
> > I have reverted that commit (and the following one) for today.
> 
> Sorry about that; turns out I forgot to test the case where cmpxchg128
> wasn't available.
> 
> Please see:
> 
> https://lkml.kernel.org/r/20230524093246.GP83892@hirez.programming.kicks-ass.net
> 
> As stated there, I'm going to zap tip/locking/core for a few days and
> let this fixed version run through the robots again before re-instating
> it.

Note to -next, this should now be resolved in the tip:auto-latest branch.

Thanks,

	Ingo


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