Bug#1135313: Please backport 9e249c484128 ("iommu/amd: serialize sequence allocation under concurrent TLB invalidations") to 6.12.y

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From	Sasha Levin <sashal@kernel.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1135313: Please backport 9e249c484128 ("iommu/amd: serialize sequence allocation under concurrent TLB invalidations") to 6.12.y
Date	Sat, 09 May 2026 14:50:01 +0200
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X-Original-Cc	Sasha Levin <sashal@kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, regressions@lists.linux.dev, Ankit Soni <Ankit.Soni@amd.com>, Srikanth Aithal <sraithal@amd.com>, Vasant Hegde <vasant.hegde@amd.com>, Joerg Roedel <joerg.roedel@amd.com>, 1135313@bugs.debian.org, Friedemann Stoyan <fstoyan@swapon.de>, Salvatore Bonaccorso <carnil@debian.org>
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Cross-posted to 2 groups.

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> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1135313#43 confirmed
> that a backport of 9e249c484128 solved the problem. Now that one does
> not apply cleanly. As an alternative the following two might work, the
> first is a clean cherry-pick, the second on top needed a slight
> adjustment since in 6.12.y f32fe7cb0198 is not present.

Both patches queued for 6.12.y.

I extended the same backport to 6.6.y as well - it carries d2a0cac10597
and the same older atomic64_add_return(1,..) pattern, so it is exposed
to the same race.

--
Sasha

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Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" "F. Stoyan" <fstoyan+reportbug@swapon.de> - 2026-05-01 06:20 +0200
  Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-01 08:00 +0200
    Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Friedemann Stoyan <fstoyan@swapon.de> - 2026-05-04 06:20 +0200
      Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-04 08:20 +0200
        Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Friedemann Stoyan <fstoyan@swapon.de> - 2026-05-05 04:40 +0200
          Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-05 21:50 +0200
  Processed: Re: Bug#1135313: Logspam: "AMD-Vi: Completion-Wait  loop timed out" "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-01 08:00 +0200
  Processed: Re: Bug#1135313: Logspam: "AMD-Vi: Completion-Wait  loop timed out" "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-04 08:20 +0200
  Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-04 08:20 +0200
  Bug#1135313: Please backport 9e249c484128 ("iommu/amd: serialize sequence allocation under concurrent TLB invalidations") to 6.12.y Sasha Levin <sashal@kernel.org> - 2026-05-09 14:50 +0200

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