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re: kern/49758: i386 radeondrmkms hangs machine on attachment

The following reply was made to PR kern/49758; it has been noted by GNATS.

From: "John D. Baker" <>
Subject: re: kern/49758: i386 radeondrmkms hangs machine on attachment
Date: Sun, 26 Apr 2015 08:21:50 -0500 (CDT)

 On Sat, 25 Apr 2015, matthew green wrote:
 >  > NetBSD 7.0_BETA (SLAB) #3: Wed Mar 18 12:20:54 CDT 2015
 >  > 	sysop%verthandi.technoskunk.fur@localhost:/d0/build/netbsd-7/obj/i386/sys/arch/i386/compile/SLAB
 >  does this kernel have LOCKDEBUG?  if not, can you try with that?
 No.  I'll update, add that, and try again.
 >  i noticed that one of my systems with i386 kernels it sometimes is able
 >  to boot and sometimes it has a kernel lock spinout while vscons is drawing
 >  the text console at radeondrmkms attach time, and i wonder if perhaps you
 >  are seeing something similar that isn't caught, but just keeps spinning?
 Lately, I can pretty reliably boot netbsd-7, but -current is problematic.
 When it hangs this way, power-cycle is the only way to regain control.
 Most recently (see kern/49710), rebooting a -current kernel after running
 a netbsd-7 kernel hung the machine at radeondrmkms attach time displaying
 a series of pairs of vertical green lines (which obviously should have
 been kernel message text).  Upon power-cycle, the next boot attempt was
 (Actually, the first attempt panicked probing the IEEE1394 devices I
 had plugged in at the time (PR to follow).  I unplugged them and rebooted
 and then it hung with the green lines.  After power cycling, I was able
 to boot the -current kernel successfully a few times in succession while
 observing results for kern/49710.)
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