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[ Upstream commit 3918e0667bbac99400b44fa5aef3f8be2eeada4a ] [ 3934.173244] ====================================================== [ 3934.179572] WARNING: possible circular locking dependency detected [ 3934.185884] 5.4.21-xfstests #1 Not tainted [ 3934.190151] ------------------------------------------------------ [ 3934.196673] dmsetup/8897 is trying to acquire lock: [ 3934.201688] ffffffffbce82b18 (shrinker_rwsem){++++}, at: unregister_shrinker+0x22/0x80 [ 3934.210268] but task is already holding lock: [ 3934.216489] ffff92a10cc5e1d0 (&pmd->root_lock){++++}, at: dm_pool_metadata_close+0xba/0x120 [ 3934.225083] which lock already depends on the new lock. [ 3934.564165] Chain exists of: shrinker_rwsem --> &journal->j_checkpoint_mutex --> &pmd->root_lock For a more detailed lockdep report, please see: https://lore.kernel.org/r/20200220234519.GA620489@mit.edu We shouldn't need to hold the lock while are just tearing down and freeing the whole metadata pool structure. Fixes: 44d8ebf436399a4 ("dm thin metadata: use pool locking at end of dm_pool_metadata_close") Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
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.