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555a0ce455
Marek reported the warning below.
=========================
WARNING: held lock freed!
5.16.0-rc2+ #10984 Not tainted
-------------------------
kworker/1:0/18 is freeing memory ffff00004034e200-ffff00004034e3ff,
with a lock still held there!
ffff00004034e348 (&root->kernfs_rwsem){++++}-{3:3}, at:
__kernfs_remove+0x310/0x37c
3 locks held by kworker/1:0/18:
#0: ffff000040107938 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at:
process_one_work+0x1f0/0x6f0
#1: ffff80000b55bdc0
((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at:
process_one_work+0x1f0/0x6f0
#2: ffff00004034e348 (&root->kernfs_rwsem){++++}-{3:3}, at:
__kernfs_remove+0x310/0x37c
stack backtrace:
CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 5.16.0-rc2+ #10984
Hardware name: Raspberry Pi 4 Model B (DT)
Workqueue: cgroup_destroy css_free_rwork_fn
Call trace:
dump_backtrace+0x0/0x1ac
show_stack+0x18/0x24
dump_stack_lvl+0x8c/0xb8
dump_stack+0x18/0x34
debug_check_no_locks_freed+0x124/0x140
kfree+0xf0/0x3a4
kernfs_put+0x1f8/0x224
__kernfs_remove+0x1b8/0x37c
kernfs_destroy_root+0x38/0x50
css_free_rwork_fn+0x288/0x3d4
process_one_work+0x288/0x6f0
worker_thread+0x74/0x470
kthread+0x188/0x194
ret_from_fork+0x10/0x20
Since kernfs moves the kernfs_rwsem lock into root, it couldn't hold
the lock when the root node is tearing down. Thus, get the refcount
of root node.
Fixes:
|
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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.