Regression: kexec/kdump boot hangs with x86/vector commits

[Dave Young]

Hi,

Kexec reboot and kdump has broken on my laptop for long time with
4.15.0-rc1+ kernels. With the patch below an early panic been fixed:
https://patchwork.kernel.org/patch/10084289/

But still can not get a successful reboot, it looked like graphic
issue, but after bisecting the kernel, I got below:

[dyoung at dhcp-*-* linux]$ git bisect good
There are only 'skip'ped commits left to test.
The first bad commit could be any of:
2db1f959d9dc16035f2eb44ed5fdb2789b754d6a
4900be83602b6be07366d3e69f756c1959f4169a
We cannot bisect more!

These two commits can no be reverted because of code conflicts, thus
I reverted the whole series from Thomas (below commits), with those
x86/vector changes reverted, kexec reboot works fine.

Could you help to take a look, any thoughts?  I can do the test
if you have some debug patch to try.

commit 90ad9e2d91067983f3328e21b306323877e5f48a
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Wed Sep 13 23:29:49 2017 +0200

    x86/io_apic: Reevaluate vector configuration on activate()

commit 2db1f959d9dc16035f2eb44ed5fdb2789b754d6a
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Wed Sep 13 23:29:50 2017 +0200

    x86/vector: Handle managed interrupts proper

commit 4900be83602b6be07366d3e69f756c1959f4169a
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Wed Sep 13 23:29:51 2017 +0200

    x86/vector/msi: Switch to global reservation mode

commit 464d12309e1b5829597793db551ae8ecaecf4036
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Wed Sep 13 23:29:52 2017 +0200

    x86/vector: Switch IOAPIC to global reservation mod

commit 2cffad7bad83157f89332872015f4305d2ac09ac
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Wed Sep 13 23:29:53 2017 +0200

    x86/irq: Simplify hotplug vector accounting

commit d6ffc6ac83b1f9f12652d89b9cb5bcbfbea7796c
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Wed Sep 13 23:29:54 2017 +0200

    x86/vector: Respect affinity mask in irq descriptor

commit 02edee152d6ea325c88898f3a702f5db2d78de7a
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Thu Oct 12 11:05:28 2017 +0200

    x86/apic/vector: Ignore set_affinity call for inactive interrupts

commit 0696d059f23c05f2dbc3b19ef50e5bdd175b782b
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Mon Oct 16 16:16:19 2017 +0200

    x86/vector: Use correct per cpu variable in free_moved_vector()
----------------

BTW, my git HEAD is below:
commit 43570f0383d6d5879ae585e6c3cf027ba321546f (origin/master, origin/HEAD, bisect)
Merge: 43f462f1c2e1 c14ca8386539
Author: Linus Torvalds <torvalds at linux-foundation.org>
Date:   Tue Nov 28 16:22:10 2017 -0800

    Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6



Thanks
Dave