This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1834119 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete ** Tags added: eoan -- 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/1834119 Title: [AEP-BUG] Critical:concurrent invocations of ndctl can cause linux panic Status in intel: New Status in linux package in Ubuntu: Incomplete Bug description: Description: Patch: fix patch in the libnvdimm pending tree. Proposed fixes here: https://lists.01.org/pipermail/linux-nvdimm/2019-June/021847.html and pushed out to libnvdimm-pending: https://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git/log/?h=libnvdimm-pending Upstream Bug link: https://github.com/pmem/ndctl/issues/96 The problem is fairly easy to reproduce in as little as 10 minutes. Do the following in parallel, like in separate terminals. Example... in term #1, #3, #5, type while [1]; do ndctl create-namespace -m devdax -s 48G done in term #2, #4, #6, type while [1]; do ndctl destroy-namespace all -f done Even simple invocation will eventually lead to a panic, it can take hours though. Example... in term #1 run the script #/bin/bash while /bin/true do ndctl destroy-namespace -f all date for R in ndctl list -R | jq -r ".[] | .dev" do for i in {1..10} do ndctl create-namespace -r $R -s 8g -m devdax done done done in term #2 type while /bin/true; do ndctl list done Run that same terminal #1 script in 2 separate terminals, thereby creating 2 separate threads that will destroy/create will usually result in a panic within an hour. Target Kernel: 5.2 Target Release: 19.10 To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1834119/+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