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[Qemu-devel] [Bug 1066909] Re: App-level clone emulation for microblaze

From: Thomas Huth
Subject: [Qemu-devel] [Bug 1066909] Re: App-level clone emulation for microblaze is broken
Date: Thu, 19 Jan 2017 14:18:40 -0000

** Changed in: qemu
       Status: Fix Committed => Fix Released

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  App-level clone emulation for microblaze is broken

Status in QEMU:
  Fix Released

Bug description:
  When CLONE_THREAD is used, the new process starts with the program
  counter pointing to the system call instruction, rather than the
  instruction immediately following it. This causes an infinite cascade
  (linear growth, not exponential) of thread creation, which quickly
  crashes when the threads start running and they're all using the same

  I'm using qemu 1.1.2 packaged with Debian, but I'm not aware of any
  fixes since then that would address the problem.

  I can provide a test program if needed; a short C program using
  syscall() directly or an even-shorter asm program can demonstrate the
  issue without need for debugging around pthread library routines.

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