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Re: kern/38762: panic: vwakeup: neg numoutput

The following reply was made to PR kern/38762; it has been noted by GNATS.

From: (Andreas Gustafsson)
Cc: Greg Oster <>
Subject: Re: kern/38762: panic: vwakeup: neg numoutput
Date: Fri, 22 Aug 2008 14:55:18 +0300 (EEST)

 To rule out the possibility that I might have built my live CD wrong,
 I went looking for other live CDs based on -current, and stumbled
 across the following comment from a user of the "jibbed" live CD at
    Usually, system hanged when I try to write any data to any
    normal disk or USB device after boot from jibbed
 That gave me the idea to try booting from a live CD (still one of my
 own builds, not jibbed) but mounting, writing to, and unmounting a
 file system on a hard disk (wd0a) instead of one on a USB mass storage
 device.  And guess what: at the unmount, it paniced with the same
 "vwakeup: neg numoutput" message as when using the USB device.
 So, it appares the bug is not USB specific at all, but that a mount /
 write / unmount of _any_ FFS file system will cause a panic if you
 have booted from a live CD.
 Andreas Gustafsson,

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