So far the fix appears to be safe, and I'm comfortable proceeding with the SRU.
** Description changed: [Impact] * VM running in QEMU with this message in qemu log qemu-system-x86_64: /build/qemu-_D3HGx/qemu-2.0.0+dfsg/block.c:3491: bdrv_error_action: Assertion `error >= 0' failed. * This results in the VM needing to be restarted. [Test Case] * This only reproduces under extremely high I/O load and very infrequently. Once per month on major clouds. [Regression Potential] - * Commit 3bbf572345c is included in 2.4.0-rc4 and newer, and still exists I have not found any commits referencing it as a regressor. - - * Patch adds memory barriers so regressions may show up in the form of - performance issues. + * Commit 3bbf572345c is included in 2.4.0-rc4 and newer, and has not + been removed in latest develepment. I have not found any commits + referencing it as a regressor. + + * Patch adds memory barriers so regressions may show up in the form of + performance issues. [Other Info] * Redhat identified this commit as the fix for the issue here https://access.redhat.com/solutions/1459913 https://bugzilla.redhat.com/show_bug.cgi?id=1142857 https://git.centos.org/blob/rpms!qemu-kvm/05bba06e575829071bce813e12709f9ec477f120/SOURCES!kvm-atomics-add-explicit-compiler-fence-in-__atomic-memo.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1655225 Title: Under heavy load qemu hits bdrv_error_action: Assertion `error >= 0' failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1655225/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs