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migration/multifd: fix nullptr access in multifd_send_terminate_threads
If the multifd_send_threads is not created when migration is failed, multifd_save_cleanup would be called twice. In this senario, the multifd_send_state is accessed after it has been released, the result is that the source VM is crashing down. Here is the coredump stack: Program received signal SIGSEGV, Segmentation fault. 0x00005629333a78ef in multifd_send_terminate_threads (err=err@entry=0x0) at migration/ram.c:1012 1012 MultiFDSendParams *p = &multifd_send_state->params[i]; #0 0x00005629333a78ef in multifd_send_terminate_threads (err=err@entry=0x0) at migration/ram.c:1012 #1 0x00005629333ab8a9 in multifd_save_cleanup () at migration/ram.c:1028 #2 0x00005629333abaea in multifd_new_send_channel_async (task=0x562935450e70, opaque=<optimized out>) at migration/ram.c:1202 #3 0x000056293373a562 in qio_task_complete (task=task@entry=0x562935450e70) at io/task.c:196 #4 0x000056293373a6e0 in qio_task_thread_result (opaque=0x562935450e70) at io/task.c:111 #5 0x00007f475d4d75a7 in g_idle_dispatch () from /usr/lib64/libglib-2.0.so.0 #6 0x00007f475d4da9a9 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0 #7 0x0000562933785b33 in glib_pollfds_poll () at util/main-loop.c:219 #8 os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:242 #9 main_loop_wait (nonblocking=nonblocking@entry=0) at util/main-loop.c:518 #10 0x00005629334c5acf in main_loop () at vl.c:1810 #11 0x000056293334d7bb in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:4471 If the multifd_send_threads is not created when migration is failed. In this senario, we don't call multifd_save_cleanup in multifd_new_send_channel_async. Signed-off-by: Zhimin Feng <fengzhimin1@huawei.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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