Re: [Xen-devel] Stopping much Linux testing in Xen Project CI

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, Mar 12, 2020 at 04:49:51PM +0000, Ian Jackson wrote:
> Linux stable branches, and Linux upstream tip, are badly broken and
> have been for months.  Apparently no-one is able to (or has time to)
> to investigate and fix.
> 
>   linux-4.4          218 days         to be suspended
>   linux-4.9          134 days         to be suspended
>   linux-4.14         134 days         to be suspended
>   linux-4.19         134 days         to be suspended
>   linux-5.4           55 days
>   linux-arm-xen     up to date
>   linux-linus        372 days         to be suspended
> 
> These are times since the last push - ie, how long it has been broken.
> Evidently no-one is paying any attention to this.[1]  I looked at the
> reports myself and:
> 
> Nested HVM is broken on Intel in all of the 4.x branches.

FWIW, it's the Debian installer kernel the one that crashes AFAICT,
all the failures are:

[    0.000000] Linux version 4.9.0-6-amd64 (debian-kernel@xxxxxxxxxxxxxxxx) 
(gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 
4.9.82-1+deb9u3 (2018-03-02)
[...]
[    0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, 
max_idle_ns: 30580167144 ns
[    0.000000] tsc: Fast TSC calibration failed
[    0.000000] tsc: Unable to calibrate against PIT
[    0.000000] tsc: HPET/PMTIMER calibration failed
[    0.000000] divide error: 0000 [#1] SMP
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.0-6-amd64 #1 
Debian 4.9.82-1+deb9u3
[    0.000000] Hardware name: Xen HVM domU, BIOS 4.14-unstable 03/11/2020
[    0.000000] task: ffffffffab611500 task.stack: ffffffffab600000
[    0.000000] RIP: 0010:[<ffffffffaaa59e1f>]  [<ffffffffaaa59e1f>] 
pvclock_tsc_khz+0xf/0x30
[    0.000000] RSP: 0000:ffffffffab603f38  EFLAGS: 00010246
[    0.000000] RAX: 000f424000000000 RBX: ffffffffffffffff RCX: 0000000000000000
[    0.000000] RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffffffffab939020
[    0.000000] RBP: ffff93806e8f1540 R08: 000000003a637374 R09: 6f6974617262696c
[    0.000000] R10: 00000032f3af6dcd R11: 4d502f5445504820 R12: ffffffffab7dc920
[    0.000000] R13: ffffffffab7e82e0 R14: 00000000000146f0 R15: 000000000000008e
[    0.000000] FS:  0000000000000000(0000) GS:ffff93806e600000(0000) 
knlGS:0000000000000000
[    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.000000] CR2: ffff938065f3a000 CR3: 0000000025c08000 CR4: 00000000000406b0
[    0.000000] Stack:
[    0.000000]  ffffffffab74b1b6 ffff93806e8f1540 ffffffffab7dc920 
ba81e537ba81e512
[    0.000000]  ffffffffffffffff ffff93806e8f1540 ffffffffab73deb6 
ffffffffab7e82e0
[    0.000000]  0000000000000000 0000000000000020 0000ffffffffab73 
00000000ffffffff
[    0.000000] Call Trace:
[    0.000000]  [<ffffffffab74b1b6>] ? tsc_init+0x39/0x25b
[    0.000000]  [<ffffffffab73deb6>] ? start_kernel+0x39f/0x46b
[    0.000000]  [<ffffffffab73d120>] ? early_idt_handler_array+0x120/0x120
[    0.000000]  [<ffffffffab73d408>] ? x86_64_start_kernel+0x14c/0x170
[    0.000000] Code: a6 bc 00 c0 9d a5 aa 0f 94 c0 c3 90 40 88 3d cd ea cb 00 
c3 0f 1f 84 00 00 00 00 00 8b 4f 18 31 d2 48 b8 00 00 00 00 40 42 0f 00 <48> f7 
f1 0f b6 57 1c 89 d1 f7 d9 48 89 c6 48 d3 e6 89 d1 48 d3 
[    0.000000] RIP  [<ffffffffaaa59e1f>] pvclock_tsc_khz+0xf/0x30
[    0.000000]  RSP <ffffffffab603f38>
[    0.000000] random: fast init done
[    0.000000] ---[ end trace 21c3bd5ec174e388 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!

On all branches it's blocked by 4.9.0-6-amd64 from Debian failing, not
the kernel under test (which could also fail, but we don't even get
there).

I have started a repro and will look into tomorrow.

Regards, Roger.

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