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SQPOLL task may find sqo_task->files == NULL and __io_sq_thread_acquire_files() would leave it unset, so following fget_many() and others try to dereference NULL and fault. Propagate an error files are missing. [ 118.962785] BUG: kernel NULL pointer dereference, address: 0000000000000020 [ 118.963812] #PF: supervisor read access in kernel mode [ 118.964534] #PF: error_code(0x0000) - not-present page [ 118.969029] RIP: 0010:__fget_files+0xb/0x80 [ 119.005409] Call Trace: [ 119.005651] fget_many+0x2b/0x30 [ 119.005964] io_file_get+0xcf/0x180 [ 119.006315] io_submit_sqes+0x3a4/0x950 [ 119.007481] io_sq_thread+0x1de/0x6a0 [ 119.007828] kthread+0x114/0x150 [ 119.008963] ret_from_fork+0x22/0x30 Reported-by: Josef Grieb <josef.grieb@gmail.com> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> 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.