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From 517a99c5fba163bf684978fe3d9476b619481391 Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Tue, 3 Mar 2020 14:51:42 +0000
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Subject: [PATCH 10/18] migration/multifd: fix nullptr access in
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multifd_send_terminate_threads
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RH-Author: Juan Quintela <quintela@redhat.com>
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Message-id: <20200303145143.149290-10-quintela@redhat.com>
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Patchwork-id: 94117
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 09/10] migration/multifd: fix nullptr access in multifd_send_terminate_threads
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Bugzilla: 1738451
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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From: Zhimin Feng <fengzhimin1@huawei.com>
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If the multifd_send_threads is not created when migration is failed,
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multifd_save_cleanup would be called twice. In this senario, the
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multifd_send_state is accessed after it has been released, the result
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is that the source VM is crashing down.
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Here is the coredump stack:
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Program received signal SIGSEGV, Segmentation fault.
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0x00005629333a78ef in multifd_send_terminate_threads (err=err@entry=0x0) at migration/ram.c:1012
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1012 MultiFDSendParams *p = &multifd_send_state->params[i];
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#0 0x00005629333a78ef in multifd_send_terminate_threads (err=err@entry=0x0) at migration/ram.c:1012
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#1 0x00005629333ab8a9 in multifd_save_cleanup () at migration/ram.c:1028
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#2 0x00005629333abaea in multifd_new_send_channel_async (task=0x562935450e70, opaque=<optimized out>) at migration/ram.c:1202
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#3 0x000056293373a562 in qio_task_complete (task=task@entry=0x562935450e70) at io/task.c:196
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#4 0x000056293373a6e0 in qio_task_thread_result (opaque=0x562935450e70) at io/task.c:111
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#5 0x00007f475d4d75a7 in g_idle_dispatch () from /usr/lib64/libglib-2.0.so.0
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#6 0x00007f475d4da9a9 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
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#7 0x0000562933785b33 in glib_pollfds_poll () at util/main-loop.c:219
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#8 os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:242
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#9 main_loop_wait (nonblocking=nonblocking@entry=0) at util/main-loop.c:518
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#10 0x00005629334c5acf in main_loop () at vl.c:1810
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#11 0x000056293334d7bb in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4471
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If the multifd_send_threads is not created when migration is failed.
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In this senario, we don't call multifd_save_cleanup in multifd_new_send_channel_async.
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Signed-off-by: Zhimin Feng <fengzhimin1@huawei.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 9c4d333c092e9c26d38f740ff3616deb42f21681)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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migration/ram.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/migration/ram.c b/migration/ram.c
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index 902c56c..3891eff 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -1229,7 +1229,15 @@ static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque)
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trace_multifd_new_send_channel_async(p->id);
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if (qio_task_propagate_error(task, &local_err)) {
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migrate_set_error(migrate_get_current(), local_err);
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- multifd_save_cleanup();
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+ /* Error happen, we need to tell who pay attention to me */
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+ qemu_sem_post(&multifd_send_state->channels_ready);
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+ qemu_sem_post(&p->sem_sync);
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+ /*
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+ * Although multifd_send_thread is not created, but main migration
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+ * thread neet to judge whether it is running, so we need to mark
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+ * its status.
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+ */
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+ p->quit = true;
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} else {
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p->c = QIO_CHANNEL(sioc);
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qio_channel_set_delay(p->c, false);
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--
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1.8.3.1
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