Commits on Mar 19, 2024

1. cephfs_mirror: check m_instance_watcher and m_mirror_watcher before u… …

   …sing them
   
   Fixes the crash:
   ```
   std::scoped_lock<std::mutex>::scoped_lock (__m=..., this=<optimized out>, this=<optimized out>, __m=...) at /usr/include/c++/11/mutex:655
   cephfs::mirror::MirrorWatcher::is_failed (this=0x0) at /usr/src/debug/ceph-19.0.0-1578.g3d482f42.el9.x86_64/src/tools/cephfs_mirror/MirrorWatcher.h:56
   cephfs::mirror::FSMirror::is_failed (this=0x557478284340) at /usr/src/debug/ceph-19.0.0-1578.g3d482f42.el9.x86_64/src/tools/cephfs_mirror/FSMirror.h:52
   cephfs::mirror::Mirror::update_fs_mirrors (this=0x5574773c3e60) at /usr/src/debug/ceph-19.0.0-1578.g3d482f42.el9.x86_64/src/tools/cephfs_mirror/Mirror.cc:515
   
   ```
   
   Fixes: https://tracker.ceph.com/issues/64751
   Signed-off-by: Jos Collin <jcollin@redhat.com>

   

   joscollin committed Mar 19, 2024
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