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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     Joseph Salisbury <joseph.salisbury@canonical.com>
Cc:     linux-rt-users@vger.kernel.org, williams@redhat.com
Subject: Re: System Hang With 5.15.79-rt54 Patch Set
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On 2023-01-18 13:52:21 [-0500], Joseph Salisbury wrote:
> I'll add more details to this thread as I continue.

Any update on this?
Does the system really hang? The dmesg says:
|[ 8235.110075] INFO: task stress-ng:9466 blocked for more than 122 seconds.

which means stress-ng is blocked for quite some time due to I/O
according to the backtrace. This appears once for each stress-ng
process, 10 times in total. It does not repeat and the system runs at
least until

| [50733.471625] hid-generic 0003:03F0:7029.0004: input,hidraw1: USB HID v1.10 Mouse [iLO Virtual Keyboard] on usb-0000:01:00.4-1/input1

~11h after that report. 
Based on that it looks like the system complained about slow I/O but did
not hang as it completed its task.

Sebastian