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Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:4
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP |
Date: |
Thu, 18 Apr 2013 14:27:53 +0100 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Tue, 16 Apr 2013, Sander Eikelenboom wrote:
> Hi Stefano,
>
> When trying to start a hvm quest with xen-unstable and qemu-upstream, it ends
> up stuck:
>
> xc: info: VIRTUAL MEMORY ARRANGEMENT:
> Loader: 0000000000100000->000000000019c864
> Modules: 0000000000000000->0000000000000000
> TOTAL: 0000000000000000->000000002f800000
> ENTRY ADDRESS: 0000000000100000
> xc: info: PHYSICAL MEMORY ALLOCATION:
> 4KB PAGES: 0x0000000000000200
> 2MB PAGES: 0x000000000000017b
> 1GB PAGES: 0x0000000000000000
> libxl: error: libxl_qmp.c:440:qmp_next: timeout
> libxl: error: libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP
>
> Bisecting pointed to this commit:
>
> commit 0ca5aa4f4c4a8bcc73988dd52a536241d35e5223
> Author: Paolo Bonzini <address@hidden>
> Date: Wed Apr 10 15:23:27 2013 +0200
>
> qemu-char: another io_add_watch_poll fix
>
> After attaching the source, we have to remove the reference we hold
> to it, because we do not hold anymore a pointer to the source.
>
> If we do not do this, removing the source will not finalize it and
> will not drop the "real" I/O watch source.
>
> This showed up when backporting the new flow control patches to older
> versions of QEMU that still used select. The whole select then failed
> with EBADF (poll instead will reporting POLLNVAL on a single pollfd)
> and QEMU froze.
>
> Signed-off-by: Paolo Bonzini <address@hidden>
> Message-id: address@hidden
> Signed-off-by: Anthony Liguori <address@hidden>
>
>
> Which changed:
>
> --- a/qemu-char.c
> +++ b/qemu-char.c
> @@ -663,6 +663,7 @@ static guint io_add_watch_poll(GIOChannel *channel,
> gpointer user_data)
> {
> IOWatchPoll *iwp;
> + int tag;
>
> iwp = (IOWatchPoll *) g_source_new(&io_watch_poll_funcs,
> sizeof(IOWatchPoll));
> iwp->fd_can_read = fd_can_read;
> @@ -671,7 +672,9 @@ static guint io_add_watch_poll(GIOChannel *channel,
> iwp->fd_read = (GSourceFunc) fd_read;
> iwp->src = NULL;
>
> - return g_source_attach(&iwp->parent, NULL);
> + tag = g_source_attach(&iwp->parent, NULL);
> + g_source_unref(&iwp->parent);
> + return tag;
> }
>
> #ifndef _WIN32
>
> Any thing that springs to mind ?
Nope, sorry.
Given the commit that your bisection identified and the error message,
it's clear that it's a QMP connection issue from libxl. I would start
looking in libxl_qmp.c.
Maybe Anthony (CC'ed) has some ideas.
- [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Sander Eikelenboom, 2013/04/16
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP,
Stefano Stabellini <=
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Paolo Bonzini, 2013/04/18
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Sander Eikelenboom, 2013/04/18
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Paolo Bonzini, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Sander Eikelenboom, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Paolo Bonzini, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Sander Eikelenboom, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Paolo Bonzini, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Sander Eikelenboom, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Paolo Bonzini, 2013/04/19
- Re: [Qemu-devel] xen-unstable qemu-upstream: libxl: error: libxl_qmp.c:440:qmp_next: timeout, libxl_qmp.c:705:libxl__qmp_initialize: Failed to connect to QMP, Sander Eikelenboom, 2013/04/19