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- qemu: Do not report eof when processing monitor IO
2703b0b5-qemu-dont-report-eof.patch bsc#1190917 OBS-URL: https://build.opensuse.org/package/show/Virtualization/libvirt?expand=0&rev=908
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James Fehlig
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2703b0b5-qemu-dont-report-eof.patch
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2703b0b5-qemu-dont-report-eof.patch
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commit 2703b0b5bf2751d523a4d8d61901e473c92ba198
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Author: Jim Fehlig <jfehlig@suse.com>
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Date: Tue Oct 5 22:23:51 2021 -0600
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qemu: Do not report eof when processing monitor IO
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There have been countless reports from users concerned about the following
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error reported by libvirtd when qemu domains are shutdown
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internal error: End of file from qemu monitor
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While the error is harmless, users often mistaken it for real problem with
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their deployments. EOF from the monitor can't be entirely ignored since
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other threads may be using the monitor and must be able to detect the EOF
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condition.
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One potential fix is to delay reporting EOF until the monitor is used
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after EOF is detected. This patch adds a 'goteof' member to the
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qemuMonitor structure, which is set when EOF is detected on the monitor
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socket. If another thread later tries to send data on the monitor, the
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EOF error is reported.
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Signed-off-by: Jim Fehlig <jfehlig@suse.com>
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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Index: libvirt-7.8.0/src/qemu/qemu_monitor.c
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===================================================================
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--- libvirt-7.8.0.orig/src/qemu/qemu_monitor.c
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+++ libvirt-7.8.0/src/qemu/qemu_monitor.c
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@@ -98,6 +98,9 @@ struct _qemuMonitor {
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* the next monitor msg */
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virError lastError;
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+ /* Set to true when EOF is detected on the monitor */
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+ bool goteof;
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+
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int nextSerial;
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bool waitGreeting;
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@@ -526,7 +529,6 @@ qemuMonitorIO(GSocket *socket G_GNUC_UNU
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{
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qemuMonitor *mon = opaque;
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bool error = false;
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- bool eof = false;
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bool hangup = false;
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virObjectRef(mon);
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@@ -544,7 +546,7 @@ qemuMonitorIO(GSocket *socket G_GNUC_UNU
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if (mon->lastError.code != VIR_ERR_OK) {
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if (cond & (G_IO_HUP | G_IO_ERR))
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- eof = true;
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+ mon->goteof = true;
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error = true;
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} else {
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if (cond & G_IO_OUT) {
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@@ -562,7 +564,7 @@ qemuMonitorIO(GSocket *socket G_GNUC_UNU
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if (errno == ECONNRESET)
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hangup = true;
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} else if (got == 0) {
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- eof = true;
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+ mon->goteof = true;
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} else {
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/* Ignore hangup/error cond if we read some data, to
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* give time for that data to be consumed */
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@@ -575,22 +577,19 @@ qemuMonitorIO(GSocket *socket G_GNUC_UNU
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if (cond & G_IO_HUP) {
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hangup = true;
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- if (!error) {
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- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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- _("End of file from qemu monitor"));
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- eof = true;
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- }
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+ if (!error)
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+ mon->goteof = true;
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}
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- if (!error && !eof &&
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+ if (!error && !mon->goteof &&
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cond & G_IO_ERR) {
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Invalid file descriptor while waiting for monitor"));
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- eof = true;
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+ mon->goteof = true;
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}
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}
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- if (error || eof) {
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+ if (error || mon->goteof) {
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if (hangup && mon->logFunc != NULL) {
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/* Check if an error message from qemu is available and if so, use
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* it to overwrite the actual message. It's done only in early
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@@ -609,7 +608,7 @@ qemuMonitorIO(GSocket *socket G_GNUC_UNU
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/* Already have an error, so clear any new error */
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virResetLastError();
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} else {
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- if (virGetLastErrorCode() == VIR_ERR_OK)
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+ if (virGetLastErrorCode() == VIR_ERR_OK && !mon->goteof)
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virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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_("Error while processing monitor IO"));
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virCopyLastError(&mon->lastError);
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@@ -630,7 +629,7 @@ qemuMonitorIO(GSocket *socket G_GNUC_UNU
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/* We have to unlock to avoid deadlock against command thread,
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* but is this safe ? I think it is, because the callback
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* will try to acquire the virDomainObj *mutex next */
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- if (eof) {
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+ if (mon->goteof) {
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qemuMonitorEofNotifyCallback eofNotify = mon->cb->eofNotify;
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virDomainObj *vm = mon->vm;
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@@ -949,6 +948,11 @@ qemuMonitorSend(qemuMonitor *mon,
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virSetError(&mon->lastError);
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return -1;
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}
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+ if (mon->goteof) {
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+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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+ _("End of file from qemu monitor"));
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+ return -1;
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+ }
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mon->msg = msg;
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qemuMonitorUpdateWatch(mon);
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@ -1,3 +1,10 @@
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-------------------------------------------------------------------
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Fri Oct 15 17:52:52 UTC 2021 - James Fehlig <jfehlig@suse.com>
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- qemu: Do not report eof when processing monitor IO
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2703b0b5-qemu-dont-report-eof.patch
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bsc#1190917
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-------------------------------------------------------------------
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Fri Oct 8 20:47:47 UTC 2021 - James Fehlig <jfehlig@suse.com>
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@ -287,6 +287,7 @@ Source100: %{name}-rpmlintrc
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# Upstream patches
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Patch0: 3f9c1a4b-fix-host-validate-sev.patch
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Patch1: 1b9ce05c-lxc-fix-cgroupV1.patch
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Patch2: 2703b0b5-qemu-dont-report-eof.patch
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# Patches pending upstream review
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Patch100: libxl-dom-reset.patch
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Patch101: network-don-t-use-dhcp-authoritative-on-static-netwo.patch
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