[Bug runtime/30393] Lockdep error in _stp_ctl_work_callback()/wake_up_interruptible() on a fedora debug kernel

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30393

--- Comment #4 from agentzh <agentzh at gmail dot com> ---
Here's my best theory: a user process has grabbed the mm map lock, and in its
critical section, stap runtime's ctl work timer is fired; and inside the ctl
work callback, stap calls wake_up_interruptible(), which may try to trigger
scheduler context switches and hence that lockdep error "Illegal context switch
in RCU-bh read-side critical section!".

__wake_up_common_lock() appears in the lockdep backtrace, which is indeed
called from __wake_up(), which is wake_up_interruptible(). Furthermore, both
_stp_request_exit and _stp_ctl_work_callback are in the lockdep backtrace.

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