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[Bug 1829779] Re: qemu-system-arm and qemu-system-aarch64 QMP hangs afte

From: Laurent Vivier
Subject: [Bug 1829779] Re: qemu-system-arm and qemu-system-aarch64 QMP hangs after kernel boots
Date: Tue, 10 Mar 2020 08:48:08 -0000

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

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  qemu-system-arm and qemu-system-aarch64 QMP hangs after kernel boots

Status in QEMU:
  Fix Released

Bug description:
  After booting a Linux kernel on both arm and aarch64, the QMP sockets gets 
unresponsive. Initially, this was thought to be limited to "quit" commands, but 
it reproduced with others (such as in this
  reproducer).  This is a partial log output:

     >>> {'execute': 'qmp_capabilities'}
     <<< {'return': {}}
     Booting Linux on physical CPU 0x0000000000 [0x410fd034]
     Linux version 4.18.16-300.fc29.aarch64 (address@hidden) (gcc version 8.2.1 
20180801 (Red Hat 8.2.1-2) (GCC)) #1 SMP Sat Oct 20 23:12:22 UTC 2018
     Policy zone: DMA32
     Kernel command line: printk.time=0 console=ttyAMA0
     >>> {'execute': 'stop'}
     <<< {'timestamp': {'seconds': 1558370331, 'microseconds': 470173}, 
'event': 'STOP'}
     <<< {'return': {}}
     >>> {'execute': 'cont'}
     <<< {'timestamp': {'seconds': 1558370331, 'microseconds': 470849}, 
'event': 'RESUME'}
     <<< {'return': {}}
     >>> {'execute': 'stop'}

  Sometimes it takes just the first "stop" command.  Overall, I was able
  to reproduce 100% of times when applied on top of

  The reproducer test can be seen/fetched at:

  And test results from Travis CI can be seen at:
   - https://travis-ci.org/clebergnu/qemu/jobs/534915669

  For convenience purposes, here's qemu-system-aarch64 launching and hanging on 
the first "stop":
   - https://travis-ci.org/clebergnu/qemu/jobs/534915669#L3634
   - https://travis-ci.org/clebergnu/qemu/jobs/534915669#L3664

  And here's qemu-system-arm hanging the very same way:
   - https://travis-ci.org/clebergnu/qemu/jobs/534915669#L3799
   - https://travis-ci.org/clebergnu/qemu/jobs/534915669#L3819

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