** Description changed: + [Impact] + + Deadlock may occur if iput_final() decides to wait for readahead pages + while a lock is held. + + In order to resolve this, the following two patches install an + asynchronous "iput" for the ceph inodes so that a hold-and-wait deadlock + doesn't occur. A more detailed example is shown in the original patch: + https://github.com/ceph/ceph-client/commit/093ea205acd4b047cf5aacabc0c6ffecf198d2a9 + + Requested patches: + + 3e1d0452edcee ceph: avoid iput_final() while holding mutex or in dispatch thread + 1cf89a8dee5e6 ceph: single workqueue for inode related works + + [Test Case] + + These changes were tested by the original requester with positive + results over a few days in their own environment where they first + experienced the regression. They have determined they are no longer + experiencing the regression with this patch set applied to a test + kernel. + + [Regression Potential] + + Several patches were required in order to cleanly cherry pick the + requested patches. A large number of changes increases the regression + potential, however, these pre-requisite patches have been in mainline + since early 2018 and the blast radius is localized only to ceph. + + + Original bug description follows: + ------------------------------------ Our internal cluster has run into a few ceph client related issues, which were root caused to be resolved by the following commits: https://github.com/ceph/ceph-client/commit/f42a774a2123e6b29bb0ca296e166d0f089e9113 https://github.com/ceph/ceph-client/commit/093ea205acd4b047cf5aacabc0c6ffecf198d2a9 Can you please backport these into bionic? 3e1d0452edcee ceph: avoid iput_final() while holding mutex or in dispatch thread 1cf89a8dee5e6 ceph: single workqueue for inode related works
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1834235 Title: Request backport of ceph commits into bionic Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: In Progress Bug description: [Impact] Deadlock may occur if iput_final() decides to wait for readahead pages while a lock is held. In order to resolve this, the following two patches install an asynchronous "iput" for the ceph inodes so that a hold-and-wait deadlock doesn't occur. A more detailed example is shown in the original patch: https://github.com/ceph/ceph-client/commit/093ea205acd4b047cf5aacabc0c6ffecf198d2a9 Requested patches: 3e1d0452edcee ceph: avoid iput_final() while holding mutex or in dispatch thread 1cf89a8dee5e6 ceph: single workqueue for inode related works [Test Case] These changes were tested by the original requester with positive results over a few days in their own environment where they first experienced the regression. They have determined they are no longer experiencing the regression with this patch set applied to a test kernel. [Regression Potential] Several patches were required in order to cleanly cherry pick the requested patches. A large number of changes increases the regression potential, however, these pre-requisite patches have been in mainline since early 2018 and the blast radius is localized only to ceph. Original bug description follows: ------------------------------------ Our internal cluster has run into a few ceph client related issues, which were root caused to be resolved by the following commits: https://github.com/ceph/ceph-client/commit/f42a774a2123e6b29bb0ca296e166d0f089e9113 https://github.com/ceph/ceph-client/commit/093ea205acd4b047cf5aacabc0c6ffecf198d2a9 Can you please backport these into bionic? 3e1d0452edcee ceph: avoid iput_final() while holding mutex or in dispatch thread 1cf89a8dee5e6 ceph: single workqueue for inode related works To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834235/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
