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From: Launchpad Bug Tracker <1783437@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1783437] Re: read-modify-write page faults error code has write bit unset
Date: Fri, 02 Jul 2021 04:17:16 -0000	[thread overview]
Message-ID: <162519943698.31921.5133309425493873694.malone@loganberry.canonical.com> (raw)
In-Reply-To: 153247670930.31632.15065752803528835886.malonedeb@chaenomeles.canonical.com

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1783437

Title:
  read-modify-write page faults error code has write bit unset

Status in QEMU:
  Expired

Bug description:
  Consider the attached C file, which does a read-modify-write of the
  form `add [mem], reg`, where `mem` points to a non-present page. In
  the resulting page fault, the W/R bit is not set, while real hardware
  does set this bit.

  % gcc -m32 qemu-bug1.c&& ./a.out && qemu-i386 ./a.out
  page fault: addr=0x70000000 err=0x6
  page fault: addr=0x70000000 err=0x4

  Tested on the qemu-3.0.0-rc1 release.

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      parent reply	other threads:[~2021-07-02  4:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-24 23:58 [Qemu-devel] [Bug 1783437] [NEW] read-modify-write page faults error code has write bit unset Fabian Hemmer
2021-05-02  5:47 ` [Bug 1783437] " Thomas Huth
2021-07-02  4:17 ` Launchpad Bug Tracker [this message]

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