This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- 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/1777029 Title: fscache: Fix hanging wait on page discarded by writeback Status in linux package in Ubuntu: Confirmed Status in linux source package in Trusty: Fix Committed Status in linux source package in Xenial: Fix Released Status in linux source package in Artful: Won't Fix Status in linux source package in Bionic: Fix Committed Bug description: == SRU Justification == [Impact] Under heavy NFS + FSCache load, a user sometimes observes a hang in __fscache_wait_on_page_write+0x5f/0xa0. Example traces: [<ffffffffc009f1bf>] __fscache_wait_on_page_write+0x5f/0xa0 [fscache] [<ffffffffc009f6da>] __fscache_uncache_all_inode_pages+0xba/0x120 [fscache] [<ffffffffc0419ece>] nfs_fscache_open_file+0x4e/0xc0 [nfs] [<ffffffffc034f1bf>] __fscache_wait_on_page_write+0x5f/0xa0 [fscache] [<ffffffffc04104dc>] __nfs_fscache_invalidate_page+0x2c/0x80 [nfs] [<ffffffffc03fb543>] nfs_invalidate_page+0x63/0x90 [nfs] [<ffffffff811925c0>] truncate_inode_page+0x80/0x90 [Fix] Cherry-pick 2c98425720233ae3e135add0c7e869b32913502f from upstream, which is a patch from the FSCache maintainer. [Testcase] The user has run a NFS stress-test with a similar home-grown patch, and will run a stress test on the proposed kernel. [Regression Potential] Patch is limited to FSCache, so regression potential is limited. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1777029/+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
