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USB errors lock up Pi 4
I wish I had more hardware with which to test, but I don't, so my data set
I have a 4 gig Raspberry Pi 4 with which I've been using an SSD connected
via USB-3 with UEFI and the kernel loaded from an SD card.
For the last couple of months I've seen occasional lockups with the USB
SSD. To see if it's the SSD, I switched to a mirrored USB-3 disk pair. I
see the same lockups.
Power doesn't appear to be an issue - the USB SSD cable has a separate
feed for power, and the hardware mirror has its own power supply.
My colocated 8 gig Raspberry Pi 4, which is running a kernel from the
beginning of January wih two USB-3 attached drives with RAIDframe, hasn't
When the Pi locks up, everything gets stuck in biowait or tstile, and with
both the SSD and the mirror, there's only one single "error reading fsbn"
line on the console. dump & reboot lock the machine again, and only
"reboot 0x4" actually reboots. It's as if the USB subsystem is 100% dead
and never retries.
I've then moved the SSD to a Pi 3 with the same kernel, and I've been
doing tons of disk I/O and lots of compiling with lots of swap use, and
it is 100% fine.
Any thoughts or ideas about what might be different about USB on a Pi 4
that might cause a read error to become fatal?
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