linux-kernel - Re: [PATCH 0/1] alpha: fix user-space corruption during memory compaction

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Message-ID: <63b2087350d6990f0e348a8028f006924363c5d0.camel@physik.fu-berlin.de>
Date: Fri, 02 Jan 2026 18:57:28 +0100
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Magnus Lindholm <linmag7@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org, 
	hch@...radead.org, macro@...am.me.uk, mattst88@...il.com, 
	richard.henderson@...aro.org, ink@...een.parts, Michael Cree
 <mcree@...on.net.nz>
Subject: Re: [PATCH 0/1] alpha: fix user-space corruption during memory
 compaction

Hi Magnus,

On Fri, 2026-01-02 at 18:30 +0100, Magnus Lindholm wrote:
> This patch fixes long-standing user-space crashes on Alpha systems
> when memory compaction is enabled.
> 
> Observed symptoms include:
>   - sporadic SIGSEGV in unrelated user programs
>   - glibc allocator failures (e.g. "unaligned tcache chunk detected")
>   - gcc "internal compiler error"
>   - heap corruption detected by malloc consistency checks
> 
> The failures occur only when page migration / compaction is active
> and disappear when compaction is disabled. They affect both UP and
> SMP kernels and are not specific to a particular Alpha CPU model.

Wow, thanks for fixing this! This has been indeed a longstanding issue and
seeing it fixed would be great.

I'm CC'ing Michael Cree who has been observing the issue as well and could
help testing your series.

I'll try to test your series as well.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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