[PATCH 2/2] migration/multifd: Fix rb->receivedmap cleanup race

[Fabiano Rosas]

Fix a segmentation fault in multifd when rb->receivedmap is cleared
too early.

After commit 5ef7e26bdb ("migration/multifd: solve zero page causing
multiple page faults"), multifd started using the rb->receivedmap
bitmap, which belongs to ram.c and is initialized and *freed* from the
ram SaveVMHandlers.

Multifd threads are live until migration_incoming_state_destroy(),
which is called after qemu_loadvm_state_cleanup(), leading to a crash
when accessing rb->receivedmap.

process_incoming_migration_co()        ...
  qemu_loadvm_state()                  multifd_nocomp_recv()
    qemu_loadvm_state_cleanup()          ramblock_recv_bitmap_set_offset()
      rb->receivedmap = NULL               set_bit_atomic(..., rb->receivedmap)
  ...
  migration_incoming_state_destroy()
    multifd_recv_cleanup()
      multifd_recv_terminate_threads(NULL)

Move the loadvm cleanup into migration_incoming_state_destroy(), after
multifd_recv_cleanup() to ensure multifd threads have already exited
when rb->receivedmap is cleared.

Adjust the postcopy listen thread comment to indicate that we still
want to skip the cpu synchronization.

CC: qemu-stable@nongnu.org
Fixes: 5ef7e26bdb ("migration/multifd: solve zero page causing multiple page 
faults")
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 migration/migration.c | 1 +
 migration/savevm.c    | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 3dea06d577..b190a574b1 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -378,6 +378,7 @@ void migration_incoming_state_destroy(void)
     struct MigrationIncomingState *mis = migration_incoming_get_current();
 
     multifd_recv_cleanup();
+    qemu_loadvm_state_cleanup();
 
     if (mis->to_src_file) {
         /* Tell source that we are done */
diff --git a/migration/savevm.c b/migration/savevm.c
index d0759694fd..7e1e27182a 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2979,7 +2979,10 @@ int qemu_loadvm_state(QEMUFile *f)
     trace_qemu_loadvm_state_post_main(ret);
 
     if (mis->have_listen_thread) {
-        /* Listen thread still going, can't clean up yet */
+        /*
+         * Postcopy listen thread still going, don't synchronize the
+         * cpus yet.
+         */
         return ret;
     }
 
@@ -3022,7 +3025,6 @@ int qemu_loadvm_state(QEMUFile *f)
         }
     }
 
-    qemu_loadvm_state_cleanup();
     cpu_synchronize_all_post_init();
 
     return ret;
-- 
2.35.3