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From: "manuel.lauss at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/30301] New: "memalign: Support scanning for aligned
 chunks" causes regression in game "factorio"
Date: Sat, 01 Apr 2023 12:31:56 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: malloc
X-Bugzilla-Version: 2.38
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: manuel.lauss at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30301

            Bug ID: 30301
           Summary: "memalign: Support scanning for aligned chunks" causes
                    regression in game "factorio"
           Product: glibc
           Version: 2.38
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: manuel.lauss at gmail dot com
  Target Milestone: ---

Commit 24cdd6c71debfd10a9f7cb217fe2a2c4c486ed6f ("memalign: Support scanning
for aligned chunks.")  causes the game "factorio" (demo here:
https://factorio.com/get-download/1.1.76/demo/linux64) to abort when loadin=
g a
saved game:

Fatal glibc error: malloc.c:3617 (_mid_memalign): assertion failed: !p ||
chunk_is_mmapped (mem2chunk (p)) || ar_ptr =3D=3D arena_for_chunk (mem2chun=
k (p))

Reverting 24cdd6c71d on top of current git head fixes the issue for me.
My system otherwise boots up and runs just fine, so this commit might expose
a bug in the factorio codebase. I'll report it to them as well.

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