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Strange usb crash during shutdown

I was shutting down my 8.99.32 system (kernel & userland both from just a few days ago), and got a strange crash. It happened after all the "special" filesystems were dismounted (/proc, /kern, etc.) but before the "regular" dismounts for /var etc.

Here's the back-trace (manually transcribed)

mutex_oncpu + 1e
mutex_vector_enter + d9
uhub_explore + 3bc
uhub_explore + cc
usb_discover.isra.2 + 68
usb_Event_thread + 77

It had started to write a crash dump but appeared to be doing a full non-sparse dump and it would have taken a very long time to dump my entire 128GB...

| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:          |
| (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee dot com   |
| Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd dot org |

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