kernel 4.19.5 crashes in Xen DomU

[Markus Schönhaber]

Hi,

I'm running Fedora 28 in a Xen DomU on a Debian Stretch Dom0. This used
to work fine but kernel 4.19.5 crashes on boot (see console output
below) - 4.19.4 and earlier don't show any problems.
Is anyone else seeing this? Is there a workaround?

Regards
  mks

Output of
# xl create /etc/xen/fedora.cfg -c
>  ┌────────────────────────────────────────────────────────────────────────┐
>  │ Fedora (4.19.5-200.fc28.x86_64) 28 (Twenty Eight)                      │
>  │ Fedora (4.19.4-200.fc28.x86_64) 28 (Twenty Eight)                      │
>  │ Fedora (4.19.3-200.fc28.x86_64) 28 (Twenty Eight)                      │
>  │ Fedora (0-rescue-ff8e39e06b0946d4b8aef0daeb33efb0) 28 (Twenty Eight)   │
>  │                                                                        │
>  │                                                                        │
>  │                                                                        │
>  │                                                                        │
>  └────────────────────────────────────────────────────────────────────────┘
>      Use the ^ and ┴ keys to select which entry is highlighted.
>      Press enter to boot the selected OS, 'e' to edit the
>      commands before booting, 'a' to modify the kernel arguments
>      before booting, or 'c' for a command line.
> 
> 
> 
> 
>      Will boot selected entry in  1 seconds
> 
> 
> [    1.919053] BUG: unable to handle kernel paging request at ffff88884b969000
> [    1.919061] PGD 220c067 P4D 220c067 PUD 0 
> [    1.919067] Oops: 0000 [#1] SMP NOPTI
> [    1.919072] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.5-200.fc28.x86_64 #1
> [    1.919080] RIP: e030:ptdump_walk_pgd_level_core+0x21a/0x4f0
> [    1.919085] Code: b8 00 00 00 00 00 40 00 00 49 83 c7 08 49 01 c5 4c 3b 7c 24 40
0f 84 c2 02 00 00 4c 89 e8 48 c1 f8 10 48 89 84 24 80 00 00 00 <49> 8b 3f 48 f7 c7
9f ff ff ff 0f 85 22 ff ff ff 41 b8 03 00 00 00
> [    1.919094] RSP: e02b:ffffc90000717e68 EFLAGS: 00010286
> [    1.919099] RAX: ffff800000000000 RBX: ffffffff8191c029 RCX: 0000000000000000
> [    1.919104] RDX: 0000000000000101 RSI: ffffffff8220a000 RDI: 000000084b969067
> [    1.919109] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> [    1.919114] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> [    1.919118] R13: 8000000000000000 R14: 0000000000000000 R15: ffff88884b969000
> [    1.919128] FS:  0000000000000000(0000) GS:ffff88807d400000(0000)
knlGS:0000000000000000
> [    1.919133] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.919137] CR2: ffff88884b969000 CR3: 000000000220a000 CR4: 0000000000042660
> [    1.919144] Call Trace:
> [    1.919151]  ? printk+0x58/0x6f
> [    1.919157]  ? rest_init+0xaa/0xaa
> [    1.919161]  kernel_init+0x31/0x107
> [    1.919166]  ret_from_fork+0x35/0x40
> [    1.919170] Modules linked in:
> [    1.919175] CR2: ffff88884b969000
> [    1.919179] ---[ end trace a85adfe208024c43 ]---
> [    1.919185] RIP: e030:ptdump_walk_pgd_level_core+0x21a/0x4f0
> [    1.919190] Code: b8 00 00 00 00 00 40 00 00 49 83 c7 08 49 01 c5 4c 3b 7c 24 40
0f 84 c2 02 00 00 4c 89 e8 48 c1 f8 10 48 89 84 24 80 00 00 00 <49> 8b 3f 48 f7 c7
9f ff ff ff 0f 85 22 ff ff ff 41 b8 03 00 00 00
> [    1.919199] RSP: e02b:ffffc90000717e68 EFLAGS: 00010286
> [    1.919204] RAX: ffff800000000000 RBX: ffffffff8191c029 RCX: 0000000000000000
> [    1.919209] RDX: 0000000000000101 RSI: ffffffff8220a000 RDI: 000000084b969067
> [    1.919214] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> [    1.919218] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> [    1.919223] R13: 8000000000000000 R14: 0000000000000000 R15: ffff88884b969000
> [    1.919231] FS:  0000000000000000(0000) GS:ffff88807d400000(0000)
knlGS:0000000000000000
> [    1.919237] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.919241] CR2: ffff88884b969000 CR3: 000000000220a000 CR4: 0000000000042660
> [    1.919261] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000009
> [    1.919261] 
> [    1.919269] Kernel Offset: disabled

[John Pilkington]

On 03/12/2018 11:46, Markus Schönhaber wrote:
>  Hi,
>  
>  I'm running Fedora 28 in a Xen DomU on a Debian Stretch Dom0. This used
>  to work fine but kernel 4.19.5 crashes on boot (see console output
>  below) - 4.19.4 and earlier don't show any problems.
>  Is anyone else seeing this? Is there a workaround?
>  
>  Regards
>     mks 
I have no idea how this compares with

https://bugzilla.redhat.com/show_bug.cgi?id=1520265

but that was cured for me on an old HP box by a BIOS update.

The same box is now running 4.19.5 fc28

John P

>  
>  Output of
>  # xl create /etc/xen/fedora.cfg -c
> >   ┌────────────────────────────────────────────────────────────────────────┐
> >   │ Fedora (4.19.5-200.fc28.x86_64) 28 (Twenty Eight)                      │
> >   │ Fedora (4.19.4-200.fc28.x86_64) 28 (Twenty Eight)                      │
> >   │ Fedora (4.19.3-200.fc28.x86_64) 28 (Twenty Eight)                      │
> >   │ Fedora (0-rescue-ff8e39e06b0946d4b8aef0daeb33efb0) 28 (Twenty Eight)   │
> >   │                                                                        │
> >   │                                                                        │
> >   │                                                                        │
> >   │                                                                        │
> >   └────────────────────────────────────────────────────────────────────────┘
> >       Use the ^ and ┴ keys to select which entry is highlighted.
> >       Press enter to boot the selected OS, 'e' to edit the
> >       commands before booting, 'a' to modify the kernel arguments
> >       before booting, or 'c' for a command line.
> >
> >
> >
> >
> >       Will boot selected entry in  1 seconds
> >
> >
> > [    1.919053] BUG: unable to handle kernel paging request at ffff88884b969000
> > [    1.919061] PGD 220c067 P4D 220c067 PUD 0
> > [    1.919067] Oops: 0000 [#1] SMP NOPTI
> > [    1.919072] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.5-200.fc28.x86_64 #1
> > [    1.919080] RIP: e030:ptdump_walk_pgd_level_core+0x21a/0x4f0
> > [    1.919085] Code: b8 00 00 00 00 00 40 00 00 49 83 c7 08 49 01 c5 4c 3b 7c 24 40
> 0f 84 c2 02 00 00 4c 89 e8 48 c1 f8 10 48 89 84 24 80 00 00 00 <49> 8b 3f 48 f7 c7
> 9f ff ff ff 0f 85 22 ff ff ff 41 b8 03 00 00 00
> > [    1.919094] RSP: e02b:ffffc90000717e68 EFLAGS: 00010286
> > [    1.919099] RAX: ffff800000000000 RBX: ffffffff8191c029 RCX: 0000000000000000
> > [    1.919104] RDX: 0000000000000101 RSI: ffffffff8220a000 RDI: 000000084b969067
> > [    1.919109] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> > [    1.919114] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> > [    1.919118] R13: 8000000000000000 R14: 0000000000000000 R15: ffff88884b969000
> > [    1.919128] FS:  0000000000000000(0000) GS:ffff88807d400000(0000)
> knlGS:0000000000000000
> > [    1.919133] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    1.919137] CR2: ffff88884b969000 CR3: 000000000220a000 CR4: 0000000000042660
> > [    1.919144] Call Trace:
> > [    1.919151]  ? printk+0x58/0x6f
> > [    1.919157]  ? rest_init+0xaa/0xaa
> > [    1.919161]  kernel_init+0x31/0x107
> > [    1.919166]  ret_from_fork+0x35/0x40
> > [    1.919170] Modules linked in:
> > [    1.919175] CR2: ffff88884b969000
> > [    1.919179] ---[ end trace a85adfe208024c43 ]---
> > [    1.919185] RIP: e030:ptdump_walk_pgd_level_core+0x21a/0x4f0
> > [    1.919190] Code: b8 00 00 00 00 00 40 00 00 49 83 c7 08 49 01 c5 4c 3b 7c 24 40
> 0f 84 c2 02 00 00 4c 89 e8 48 c1 f8 10 48 89 84 24 80 00 00 00 <49> 8b 3f 48 f7 c7
> 9f ff ff ff 0f 85 22 ff ff ff 41 b8 03 00 00 00
> > [    1.919199] RSP: e02b:ffffc90000717e68 EFLAGS: 00010286
> > [    1.919204] RAX: ffff800000000000 RBX: ffffffff8191c029 RCX: 0000000000000000
> > [    1.919209] RDX: 0000000000000101 RSI: ffffffff8220a000 RDI: 000000084b969067
> > [    1.919214] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> > [    1.919218] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> > [    1.919223] R13: 8000000000000000 R14: 0000000000000000 R15: ffff88884b969000
> > [    1.919231] FS:  0000000000000000(0000) GS:ffff88807d400000(0000)
> knlGS:0000000000000000
> > [    1.919237] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [    1.919241] CR2: ffff88884b969000 CR3: 000000000220a000 CR4: 0000000000042660
> > [    1.919261] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000009
> > [    1.919261]
> > [    1.919269] Kernel Offset: disabled
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>

[M A Young]

On Mon, 3 Dec 2018, Markus Schönhaber wrote:

>  Hi,
>  
>  I'm running Fedora 28 in a Xen DomU on a Debian Stretch Dom0. This used
>  to work fine but kernel 4.19.5 crashes on boot (see console output
>  below) - 4.19.4 and earlier don't show any problems.
>  Is anyone else seeing this? Is there a workaround?
>  
>  Regards
>    mks
>  ...
>  > 
>  > [    1.919053] BUG: unable to handle kernel paging request at ffff88884b969000
>  > [    1.919061] PGD 220c067 P4D 220c067 PUD 0 
>  > [    1.919067] Oops: 0000 [#1] SMP NOPTI
>  > [    1.919072] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.5-200.fc28.x86_64 #1
>  > [    1.919080] RIP: e030:ptdump_walk_pgd_level_core+0x21a/0x4f0
>  > [    1.919085] Code: b8 00 00 00 00 00 40 00 00 49 83 c7 08 49 01 c5 4c 3b 7c 24 40
> 0f 84 c2 02 00 00 4c 89 e8 48 c1 f8 10 48 89 84 24 80 00 00 00 <49> 8b 3f 48 f7 c7
> 9f ff ff ff 0f 85 22 ff ff ff 41 b8 03 00 00 00
>  > [    1.919094] RSP: e02b:ffffc90000717e68 EFLAGS: 00010286
>  > [    1.919099] RAX: ffff800000000000 RBX: ffffffff8191c029 RCX: 0000000000000000
>  > [    1.919104] RDX: 0000000000000101 RSI: ffffffff8220a000 RDI: 000000084b969067
>  > [    1.919109] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
>  > [    1.919114] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>  > [    1.919118] R13: 8000000000000000 R14: 0000000000000000 R15: ffff88884b969000
>  > [    1.919128] FS:  0000000000000000(0000) GS:ffff88807d400000(0000)
> knlGS:0000000000000000
>  > [    1.919133] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
>  > [    1.919137] CR2: ffff88884b969000 CR3: 000000000220a000 CR4: 0000000000042660
>  > [    1.919144] Call Trace:
>  > [    1.919151]  ? printk+0x58/0x6f
>  > [    1.919157]  ? rest_init+0xaa/0xaa
>  > [    1.919161]  kernel_init+0x31/0x107
>  > [    1.919166]  ret_from_fork+0x35/0x40
>  > [    1.919170] Modules linked in:
>  > [    1.919175] CR2: ffff88884b969000
>  > [    1.919179] ---[ end trace a85adfe208024c43 ]---
>  > [    1.919185] RIP: e030:ptdump_walk_pgd_level_core+0x21a/0x4f0
>  > [    1.919190] Code: b8 00 00 00 00 00 40 00 00 49 83 c7 08 49 01 c5 4c 3b 7c 24 40
> 0f 84 c2 02 00 00 4c 89 e8 48 c1 f8 10 48 89 84 24 80 00 00 00 <49> 8b 3f 48 f7 c7
> 9f ff ff ff 0f 85 22 ff ff ff 41 b8 03 00 00 00
>  > [    1.919199] RSP: e02b:ffffc90000717e68 EFLAGS: 00010286
>  > [    1.919204] RAX: ffff800000000000 RBX: ffffffff8191c029 RCX: 0000000000000000
>  > [    1.919209] RDX: 0000000000000101 RSI: ffffffff8220a000 RDI: 000000084b969067
>  > [    1.919214] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
>  > [    1.919218] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>  > [    1.919223] R13: 8000000000000000 R14: 0000000000000000 R15: ffff88884b969000
>  > [    1.919231] FS:  0000000000000000(0000) GS:ffff88807d400000(0000)
> knlGS:0000000000000000
>  > [    1.919237] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
>  > [    1.919241] CR2: ffff88884b969000 CR3: 000000000220a000 CR4: 0000000000042660
>  > [    1.919261] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x00000009
>  > [    1.919261] 
>  > [    1.919269] Kernel Offset: disabled 
It looks like the "Linux 4.19.5 fails to boot as Xen dom0" issue being 
discussed on the xen-devel list, eg. see 
https://lists.xenproject.org/archives/html/xen-devel/2018-11/msg03557.html
Basically there is an issue with the 4.19.5 kernel that upset Xen.

	Michael Young

[Markus Schönhaber]

M A Young, Mon, 3 Dec 2018 12:33:40 +0000 (GMT):

>  It looks like the "Linux 4.19.5 fails to boot as Xen dom0"
> issue being 
>  discussed on the xen-devel list, eg. see 
>  https://lists.xenproject.org/archives/html/xen-devel/2018-11/msg03557.html
>  Basically there is an issue with the 4.19.5 kernel that upset Xen. 
Thanks for the pointer!
Guess, I'll try to rebuild the kernel with the patches posted there to
see if that not only fixes booting as Dom0 but also as DomU.

-- 
Regards
  mks

[Markus Schönhaber]

Markus Schönhaber, Mon, 3 Dec 2018 13:58:31 +0100:

>  M A Young, Mon, 3 Dec 2018 12:33:40 +0000 (GMT):
>  
> > It looks like the "Linux 4.19.5 fails to boot as Xen dom0" issue being 
> > discussed on the xen-devel list, eg. see 
> > https://lists.xenproject.org/archives/html/xen-devel/2018-11/msg03557.html
> > Basically there is an issue with the 4.19.5 kernel that upset Xen.
>  
>  Thanks for the pointer!
>  Guess, I'll try to rebuild the kernel with the patches posted there to
>  see if that not only fixes booting as Dom0 but also as DomU. 
Indeed, my DomU boots
fine with an upstream 4.19.5 kernel with those
patches applied.

-- 
Regards
  mks