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The 4.19 backportdc34710a7a("padata: Remove broken queue flushing") removed padata_alloc_pd()'s assignment to pd->pinst, resulting in: Unable to handle kernel NULL pointer dereference ... ... pc : padata_reorder+0x144/0x2e0 ... Call trace: padata_reorder+0x144/0x2e0 padata_do_serial+0xc8/0x128 pcrypt_aead_enc+0x60/0x70 [pcrypt] padata_parallel_worker+0xd8/0x138 process_one_work+0x1bc/0x4b8 worker_thread+0x164/0x580 kthread+0x134/0x138 ret_from_fork+0x10/0x18 This happened because the backport was based on an enhancement that moved this assignment but isn't in 4.19:bfde23ce20("padata: unbind parallel jobs from specific CPUs") Simply restore the assignment to fix the crash. Fixes:dc34710a7a("padata: Remove broken queue flushing") Reported-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Sasha Levin <sashal@kernel.org> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.