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If an application is doing reads on signalfd, and we arm the poll handler because there's no data available, then the wakeup can recurse on the tasks sighand->siglock as the signal delivery from task_work_add() will use TWA_SIGNAL and that attempts to lock it again. We can detect the signalfd case pretty easily by comparing the poll->head wait_queue_head_t with the target task signalfd wait queue. Just use normal task wakeup for this case. Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.