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4ae6dbd683
io_fail_links() doesn't consider REQ_F_COMP_LOCKED leading to nested
spin_lock(completion_lock) and lockup.
[ 197.680409] rcu: INFO: rcu_preempt detected expedited stalls on
CPUs/tasks: { 6-... } 18239 jiffies s: 1421 root: 0x40/.
[ 197.680411] rcu: blocking rcu_node structures:
[ 197.680412] Task dump for CPU 6:
[ 197.680413] link-timeout R running task 0 1669
1 0x8000008a
[ 197.680414] Call Trace:
[ 197.680420] ? io_req_find_next+0xa0/0x200
[ 197.680422] ? io_put_req_find_next+0x2a/0x50
[ 197.680423] ? io_poll_task_func+0xcf/0x140
[ 197.680425] ? task_work_run+0x67/0xa0
[ 197.680426] ? do_exit+0x35d/0xb70
[ 197.680429] ? syscall_trace_enter+0x187/0x2c0
[ 197.680430] ? do_group_exit+0x43/0xa0
[ 197.680448] ? __x64_sys_exit_group+0x18/0x20
[ 197.680450] ? do_syscall_64+0x52/0xa0
[ 197.680452] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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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.