re: kern/46547: umass: sd crashes when synchronizing cache while trying to suspend

[matthew green <mrg%eterna.com.au@localhost>]

The following reply was made to PR kern/46547; it has been noted by GNATS.

From: matthew green <mrg%eterna.com.au@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost
Subject: re: kern/46547: umass: sd crashes when synchronizing cache while 
trying to suspend
Date: Wed, 06 Jun 2012 04:06:26 +1000

 this smells like what i did to amd64 cpu_reboot() to make it not crash
 when rebooting when usb disks are present.  this ended up trying to 
 perform a sync. operation from a softint handler, which triggers
 checks in cv_wait() or tsleep
 
 note that i didn't say "fix".  :-(  i'm not really sure what the right
 solution here is.  can you try a kernel with LOCKDEBUG enabled and
 show us the full output?
 
 i did try having these events run from the USB task thread but that
 just left me with a soft-hung system at reboot.  it was about then
 that i noticed i386 and amd64 cpu_reboot() were pretty different and
 when i made amd64 like i386, i had no more crashes.  however, that
 really only happens because cpu_reboot() arranges it, not that the
 problem was actually fixed.
 
 
 .mrg.