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[Qemu-devel] [Bug 1156632] Re: not receiving RESET event after system_re
From: |
Bram Klein Gunnewiek |
Subject: |
[Qemu-devel] [Bug 1156632] Re: not receiving RESET event after system_reset command causes QMP connection to die |
Date: |
Thu, 11 Jan 2018 11:45:35 -0000 |
I'm not sure, the current implementation is multi-threaded so I won't
hit this bug if its still present. If I can find the time I will make a
proof of concept and test if the bug is still present.
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https://bugs.launchpad.net/bugs/1156632
Title:
not receiving RESET event after system_reset command causes QMP
connection to die
Status in QEMU:
Incomplete
Bug description:
I have written my own implementation to control machine running KVM
instances with the QMP protocol. Its a pretty basic implementation
that sends/receives in the same thread. This means that all of the
events QEMU sents are received only when the application expects a
reply from a command. In the following scenario, i'm unable to
(re)connect to the QMP socket from QEMU after I closed the connection:
1) Connect to QMP
2) Sent qmp_capabilities
3) Receive reply
4) Send system_reset
5) Receive reply
6) close socket
7) Connect to socket -> connection refused
However, in the following scenario, I am able to connect after I disconnect
the socket because I have read the two RESET events:
1) Connect to QMP
2) Sent qmp_capabilities
3) Receive reply
4) Send system_reset
5) Receive reply
6) Receive reply (is a RESET event)
7) Receive reply (is a RESET event)
8) close socket
9) Connect to socket -> ok
I don't know if this is a bug or expected behavior. I can't find any
proper way to disconnect the socket documentated. Am I doïng something
wrong, or is this a bug in the QMP implementation of QEMU?
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