New debdiff in attach that enforces gcc-10 to build the dkms part on s390x.
** Description changed: [Impact] Installing zfs-dkms seems to trigger a soft lockup issue as soon as zfs.ko is loaded. When the soft lockup happens the system isn't reachable anymore via ssh and on the console we can see some exlicit rcu stall warnings. This seems to happen only when zfs is compile with gcc >= 11.2.0-10ubuntu1. Downgrading gcc to previous versions doesn't show the problem and zfs is working just fine. [Test case] On s390x install the latest 5.15 Jammy kernel and run: apt install zfs-dkms [Fix] - Temporary workaround is to downgrade gcc. + Temporary workaround is to build zfs with gcc-10 on s390x. + + [Regression potential] + + Building a kernel module with a different compiler is never 100% safe, + we may experience potential crashes / panics if the ABI is not + compatible. Moreover, if we build zfs with gcc-10 we are going to lose + some of the performance benefits provided by gcc-11. + + However these regressions are limited to zfs on s390x and without this + change zfs is broken anyway on this architecture. ** Patch added: "zfs-update-to-2.1.2-v2.debdiff" https://bugs.launchpad.net/ubuntu/+source/gcc-11/+bug/1954676/+attachment/5553372/+files/zfs-update-to-2.1.2-v2.debdiff -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1954676 Title: jammy 5.15 kernel soft lockup when zfs.ko is loaded on s390x w/ gcc >= 11.2.0-10ubuntu1 Status in gcc-11 package in Ubuntu: New Status in zfs-linux package in Ubuntu: New Status in gcc-11 source package in Jammy: New Status in zfs-linux source package in Jammy: New Bug description: [Impact] Installing zfs-dkms seems to trigger a soft lockup issue as soon as zfs.ko is loaded. When the soft lockup happens the system isn't reachable anymore via ssh and on the console we can see some exlicit rcu stall warnings. This seems to happen only when zfs is compile with gcc >= 11.2.0-10ubuntu1. Downgrading gcc to previous versions doesn't show the problem and zfs is working just fine. [Test case] On s390x install the latest 5.15 Jammy kernel and run: apt install zfs-dkms [Fix] Temporary workaround is to build zfs with gcc-10 on s390x. [Regression potential] Building a kernel module with a different compiler is never 100% safe, we may experience potential crashes / panics if the ABI is not compatible. Moreover, if we build zfs with gcc-10 we are going to lose some of the performance benefits provided by gcc-11. However these regressions are limited to zfs on s390x and without this change zfs is broken anyway on this architecture. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-11/+bug/1954676/+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
