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Sowmini Varadhan says: ==================== rds: use RCU between work-enqueue and connection teardown This patchset follows up on the root-cause mentioned in https://www.spinics.net/lists/netdev/msg472849.html Patch1 implements some code refactoring that was suggeseted as an enhancement in http://patchwork.ozlabs.org/patch/843157/ It replaces the c_destroy_in_prog bit in rds_connection with an atomically managed flag in rds_conn_path. Patch2 builds on Patch1 and uses RCU to make sure that work is only enqueued if the connection destroy is not already in progress: the test-flag-and-enqueue is done under rcu_read_lock, while destroy first sets the flag, uses synchronize_rcu to wait for existing reader threads to complete, and then starts all the work-cancellation. Since I have not been able to reproduce the original stack traces reported by syszbot, and these are fixes for a race condition that are based on code-inspection I am not marking these as reported-by at this time. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.