[RFC PATCH 0/2] migration: Fix multifd qemu_mutex_destroy race

[Fabiano Rosas]

We're calling qemu_sem_post() in threads other than the multifd
channel and the migration thread. This is vulnerable to a race with
multifd_save_cleanup() which calls qemu_sem_destroy(). If we attempt
to destroy the semaphore mutex with the lock taken, the code asserts.

We're hitting this in the current master and we've had reports of this
in the past already:

[PATCH] migrate/multifd: fix coredump when the multifd thread cleanup
https://lore.kernel.org/r/20230621081826.3203053-1-zhangjianguo18@huawei.com

Fabiano Rosas (2):
  migration: Report error in incoming migration
  migration/multifd: Move semaphore release into main thread

 migration/migration.c | 11 ++++++++++-
 migration/multifd.c   | 29 +++++++++++------------------
 2 files changed, 21 insertions(+), 19 deletions(-)

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2.35.3