The issue reported by Miklos Szeredi was processes blocking when trying to close an inotify file descriptor, while another fanotify listener is failing to handle permission events.
Miklos included a test program with the report. His test program with some modifications is available on my github: https://github.com/amir73il/fsnotify-utils/blob/master/fanotify_bug.c Ideally, we would want that destruction of a group would only block if an event handled by this group is in progress, but this is not easy to achieve. Instead, we make sure that destrurction of a group would only block if an event handled by a group of similar class (priority) is in progress. Amir Goldstein (2): fsnotify: separate fsnotify_mark_srcu for groups with permission events fsnotify: handle permission events without holding fsnotify_mark_srcu[0] fs/notify/fanotify/fanotify.c | 15 ++++++--- fs/notify/fsnotify.c | 57 ++++++++++++++++++++++++++++---- fs/notify/fsnotify.h | 17 ++++++++-- fs/notify/group.c | 2 +- fs/notify/mark.c | 77 ++++++++++++++++++++++++++++++++----------- 5 files changed, 134 insertions(+), 34 deletions(-) -- 2.7.4
