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From 0022c9aef2ecf60e9091e6df57e56065b14b67c5 Mon Sep 17 00:00:00 2001
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Message-Id: <0022c9aef2ecf60e9091e6df57e56065b14b67c5@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Thu, 28 Jul 2022 15:35:45 +0200
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Subject: [PATCH] qemu_migration_params: Avoid deadlock in
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qemuMigrationParamsReset
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In my recent comnmit v8.5.0-188-gc47f1abb81 I accidentally moved
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qemuMigrationParamsResetTLS after qemuDomainObjEnterMonitorAsync not
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noticing qemuMigrationParamsResetTLS will try to enter the monitor
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again. The second call will time out and return with a domain object
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locked. But we're still in monitor section and the object should be
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unlocked which means qemuDomainObjExitMonitor will deadlock trying to
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lock it again.
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Fixes: c47f1abb81194461377a0c608a7ecd87f9ce9146
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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(cherry picked from commit 8cb19a9b9a56ab6ebefc1f913c545e0bb86d4364)
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https://bugzilla.redhat.com/show_bug.cgi?id=2107892
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/qemu_migration_params.c | 12 +++++++++---
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1 file changed, 9 insertions(+), 3 deletions(-)
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diff --git a/src/qemu/qemu_migration_params.c b/src/qemu/qemu_migration_params.c
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index 4a824ff5e1..4766d16e64 100644
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--- a/src/qemu/qemu_migration_params.c
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+++ b/src/qemu/qemu_migration_params.c
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@@ -1291,6 +1291,7 @@ qemuMigrationParamsReset(virQEMUDriver *driver,
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{
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virErrorPtr err;
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g_autoptr(virBitmap) clearCaps = NULL;
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+ int rc;
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virErrorPreserveLast(&err;;
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@@ -1305,11 +1306,16 @@ qemuMigrationParamsReset(virQEMUDriver *driver,
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clearCaps = virBitmapNew(0);
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- if (qemuMigrationParamsApplyCaps(vm, clearCaps) == 0 &&
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- qemuMigrationParamsApplyValues(vm, origParams, false) == 0)
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- qemuMigrationParamsResetTLS(driver, vm, asyncJob, origParams, apiFlags);
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+ rc = 0;
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+ if (qemuMigrationParamsApplyCaps(vm, clearCaps) < 0 ||
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+ qemuMigrationParamsApplyValues(vm, origParams, false) < 0)
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+ rc = -1;
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qemuDomainObjExitMonitor(vm);
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+ if (rc < 0)
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+ goto cleanup;
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+
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+ qemuMigrationParamsResetTLS(driver, vm, asyncJob, origParams, apiFlags);
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cleanup:
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virErrorRestore(&err;;
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--
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2.35.1
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