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[Qemu-commits] [qemu/qemu] 976a55: Revert "linux-user: un-parent OBJECT(

From: Richard Henderson
Subject: [Qemu-commits] [qemu/qemu] 976a55: Revert "linux-user: un-parent OBJECT(cpu) when clo...
Date: Thu, 18 Aug 2022 19:30:05 -0700

  Branch: refs/heads/staging
  Home:   https://github.com/qemu/qemu
  Commit: 976a55c0fe427a0084823152447cf5bb9092d24f
  Author: Richard Henderson <richard.henderson@linaro.org>
  Date:   2022-08-18 (Thu, 18 Aug 2022)

  Changed paths:
    M linux-user/syscall.c

  Log Message:
  Revert "linux-user: un-parent OBJECT(cpu) when closing thread"

This reverts commit 52f0c1607671293afcdb2acc2f83e9bccbfa74bb.

This caused a regression in arm/aarch64.

We are hard-coding ARMCPRegInfo pointers into TranslationBlocks,
for calling into helper_{get,set}cp_reg{,64}.  So we have a race
condition between whichever cpu thread translates the code first
(encoding the pointer), and that cpu thread exiting, so that the
next execution of the TB references a freed data structure.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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