RE: 5.4-rc6 on Supermicro X9SRL-F - Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception handler

[Justin Piszcz]

-----Original Message-----
From: Justin Piszcz [mailto:jpiszcz@xxxxxxxxxxxxxxx] 
Sent: Monday, November 4, 2019 8:57 AM
To: LKML
Subject: 5.4-rc6 on Supermicro X9SRL-F - Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception handler

Hello,

Kernel: 5.4-rc6
Arch: x86_64
Distro: Debian Testing

Problem: On occasion, every 4-5 reboots or so I get the following error
and the Linux kernel fails to boot (see attached screenshot of the
Linux console) when using a USB-3 PCI-e card.

[ .. ]

In case anyone is reading this in the future-- the root cause was using a High Point USB 3.0 card (PCI-e 2.0 -x4 width) in the machine:
RocketU 1144A/1144AM/1144AR on the PCB

Issue - every 1-5 reboots, the kernel would fail to boot with: Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception handler

After removing the card, this has not recurred (tested w/88 reboots via script) and not a single recurrence of the issue.

Regards,

Justin.