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[Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in

From: Richard W.M. Jones
Subject: [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes
Date: Tue, 19 Jun 2012 10:16:32 -0000

I switched to using virtio-scsi (instead of virtio-blk).  This appears to have 
this problem, although it brings another problem.  I also tried vscsi, which 
both problems.

Therefore I will (not definitively) claim that the problem lies somewhere in 
but a workaround seems to be available.

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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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