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- xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed- xenial'.
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-xenial -- 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/1908428 Title: 4.4 kernel panics in kvm wake_up() handler Status in linux package in Ubuntu: Invalid Status in linux source package in Xenial: Fix Committed Bug description: [Description] User reported that 4.4 kernels are affected by the bug in [1]. The bug presents itself with the following trace : [219901.424329] CPU: 19 PID: 0 Comm: swapper/19 Tainted: G OE 4.4.0-133-generic #159~14.04.1-Ubuntu [219901.441800] task: ffff885f62e63fc0 ti: ffff885f62e7c000 task.ti: ffff885f62e7c000 [219901.449408] RIP: 0010:[<ffffffffc09c8cfd>] [<ffffffffc09c8cfd>] wakeup_handler+0x6d/0xa0 [kvm_intel] [219901.458791] RSP: 0018:ffff885f7c043f70 EFLAGS: 00010083 [219901.464217] RAX: ffff885f7c040000 RBX: dead0000000000b8 RCX: ffff885f7c0586c0 [219901.471480] RDX: dead000000000100 RSI: 0000000000000000 RDI: ffff885f7c0586b0 [219901.478741] RBP: ffff885f7c043f90 R08: 0000000000000000 R09: 0000c7ffc2ec9069 [219901.486003] R10: 0000000000000494 R11: ffff885f7c057370 R12: 00000000000186b0 [219901.493267] R13: 0000000000000013 R14: 00000000000186c0 R15: ffff885f62e7c000 [219901.500528] FS: 0000000000000000(0000) GS:ffff885f7c040000(0000) knlGS:0000000000000000 [219901.511738] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [219901.517597] CR2: 00007f6d57098000 CR3: 0000003183dfe000 CR4: 0000000000362670 [219901.524860] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [219901.532121] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [219901.539384] Stack: [219901.541509] 0000000000000000 0000000000000013 0000000000000000 0000000000000000 [219901.549120] ffff885f7c043fa8 ffffffff8102fa99 ffffffff81f40200 ffff885f62e7fe98 [219901.556747] ffffffff8182131f ffff885f62e7fde8 <EOI> ffff885f62e7c000 0000000000000000 [219901.565006] Call Trace: [219901.567567] <IRQ> [219901.569592] [<ffffffff8102fa99>] smp_kvm_posted_intr_wakeup_ipi+0x59/0x70 [219901.576795] [<ffffffff8182131f>] kvm_posted_intr_wakeup_ipi+0xbf/0xd0 [219901.583431] <EOI> [219901.585456] [<ffffffff81037b30>] ? hard_disable_TSC+0x30/0x30 [219901.591621] [<ffffffff810645a6>] ? native_safe_halt+0x6/0x10 [219901.597479] [<ffffffff81037b4e>] default_idle+0x1e/0xe0 [219901.602900] [<ffffffff810386c5>] arch_cpu_idle+0x15/0x20 [219901.608416] [<ffffffff810c3e7a>] default_idle_call+0x2a/0x40 [219901.614270] [<ffffffff810c41d0>] cpu_startup_entry+0x2e0/0x350 [219901.620305] [<ffffffff81050c2c>] start_secondary+0x16c/0x190 The root cause is blocked_vcpu_on_cpu list is corrupted. This bug is fixed with the patchset found in [2]. Only the first 3 (out of 4) of them have made their way in upstream kernel and are the ones needed to fix the bug. [Test case] It was not possible to reproduce this bug locally. A test kernel with the fixing patches has been provided to the user and they confirmed that it resolves the issue. [Regression Potential] The patches have been accepted upstream in 4.14 and so far there are no known regressions. Backporting the patches was necessary; original patches modify pi_pre/post_block functions which are not present in 4.4. These functions are introduced by upstream commit bc22512bb24c(kvm: vmx: rename vmx_pre/post_block to pi_pre/post_block). Appropriate changes where made for the patches to modify vmx_pre/post_block function without changing the functionality of the patches. Testing has not revealed any regressions. [Other] Only 4.4 kernels are affected. [1] https://marc.info/?l=kvm&m=149559827906211&w=2 [2] https://lore.kernel.org/lkml/20170606105707.23207-1-pbonz...@redhat.com/ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1908428/+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
