On 16 Feb 2019, Greg KH told this: > On Sat, Feb 16, 2019 at 04:26:30PM +0000, Nix wrote: >> So I just tried to connect up to my ancient Soekris firewall's serial >> console to try to bisect a problem where it stopped booting in 4.20, and >> found I couldn't. >> >> minicom says: >> >> minicom: cannot open /dev/ttyUSB0: Input/output error >> >> and in the dmesg we see >> >> [705576.028170] pl2303 ttyUSB0: failed to submit interrupt urb: -28 >> >> Booting to 4.19, everything works fine. (A random GalliumOS Chromebook [...] > > bisection would be great, thanks! Rrrg. This is going to be harder than I thought. Rebooting, everything works fine! So this is something that kicks in after something less than eight days uptime, consistently on every box I own, but is fine on reboot. I'm still fairly sure this is a regression -- my machines are often up for a lot longer than that and I've never seen this before I upgraded to 4.20.x -- but I don't think I'm going to identify it by mindless bisection. I might have to actually *think* about it.
