Hi, Before I go hunting - has anyone seen a deadlock in synchronize_srcu() in debugfs_remove() before? We're observing that with our (backported, but very recent) driver against 4.9 (and 4.10, I think), but there are no backports of any debugfs things so the backport itself doesn't seem like a likely problem.
sysrq-w shows a lot of tasks blocked on various locks (e.g. RTNL), but the ultimate problem is the wireless stack getting blocked on debugfs_remove_recursive(), in __synchronize_srcu(), in wait_for_completion() (while holding lots of locks, hence the other tasks getting stuck). Thanks, johannes
