Looking through old bug tickets... can you still reproduce this issue
with the latest version of QEMU? Or could we close this ticket nowadays?

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

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  qemu-system-ppc64 hanging occasionally in disk writes

Status in QEMU:

Bug description:
  I found last week that qemu-system-ppc64 (from git) hangs occasionally        
  under load, and I have a reproducer for it now.  Unfortunately the            
  reproducer really takes a long time to run -- usually I can get a hang        
  in under 12 hours.                                                            
  Here is the reproducer case:                                                  
  (1) Verified by one other person (other than me).  Happens on both            
      ppc64 and x86-64 host.                                                    
  (2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel       
      3.5.0 that I compiled myself.  The test case above contains 3.3.4-5.      
  (3) Seems to be a problem in qemu, not the guest.  The reason I think         
      this is because I tried to capture a backtrace of the hang using          
      remote gdb, but gdb just hung when trying to connect to qemu              
      (gdb connects fine before the bug happens).                               
  (4) Judging by guest messages, appears to be happening when writing           
      to the disk.

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