[Qemu-devel] [RFC PATCH for 4.1] linux-user: unparent CPU object before unref

["Alex Bennée" <alex.bennee@linaro.org>]

When a CPU object is created it is parented during it's realize stage.
If we don't unparent before the "final" unref we will never finzalize
the object leading to a memory leak. For most setups you probably
won't notice but with anything that creates and destroys a lot of
threads this will add up. This goes especially for architectures which
allocate a lot of memory in their CPU structures.

Fixes: https://bugs.launchpad.net/qemu/+bug/1836558
Cc: 1836558@bugs.launchpad.net
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 linux-user/syscall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 39a37496fed..4c9313fd9d0 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7183,6 +7183,7 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
                           NULL, NULL, 0);
             }
             thread_cpu = NULL;
+            object_unparent(OBJECT(cpu));
             object_unref(OBJECT(cpu));
             g_free(ts);
             rcu_unregister_thread();
-- 
2.20.1