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** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Xenial)
Status: New => Incomplete
** Tags added: xenial
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https://bugs.launchpad.net/bugs/1908428
Title:
4.4 kernel panics in kvm wake_up() handler
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Incomplete
Bug 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.
A test kernel with the fixing patches have been provided to the user and they
confirmed that it resolves the issue.
[1] https://marc.info/?l=kvm&m=149559827906211&w=2
[2] https://lore.kernel.org/lkml/20170606105707.23207-1-pbonz...@redhat.com/
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