Re: Panic during reboot on amd64 9.99.52

[Paul Goyette <paul%whooppee.com@localhost>]

On Fri, 27 Mar 2020, Paul Goyette wrote:

> With a curent built from sources updated just a few hours ago (on 2020-03-27 
> at 16:13:55 UTC), I get a panic during shutdown.  The
> stack trace doesn't seem to be saved, but I manually transcribed
> it:
>
> 	vpanic + 0x178
> 	kern_assert + 0x48
> 	config_detach + 0x65
> 	mii_detach + 0x109
> 	wm_detach + 0xb0
> 	config_detach + 0xe5
> 	config_detach_all + 0x97
> 	cpu_reboot + 0x198
> 	sys_reboot
> 	sys_reboot + 0x63
> 	syscall + 0x299
> 	(syscall #208)
>
> Unfortunately, the actual panic message had scrolled off the screen,
> but it included "bad device fstate".
>
> The only mii on my machine should be
>
> 	ihphy0 at wm0 phy 2: i217 10/100/1000 media interface, rev. 5
>
> and is configured as
>
> 	ihphy0 at mii? phy ?
>
> Anyone got any ideas?
>
> For now I have reverted to my previous 9.99.46 kernel...

A bit more info...

The panic message is from the KASSERTMSG() at line 1742 in source file 
kern/subr_autoconf.c rev 1.269 (very early in config_detach()):

	KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND ||
		cf->cf_fstate == FSTATE_STAR),
	    "config_detach: %s: bad device fstate: %d",
	    device_xname(dev), cf ? cf->cf_fstate : -1);

The actual panic message is

	config_detach: ihphy0: bad device fstate: 0

According to the #defines in sys/device.h we have

	#define FSTATE_NOTFOUND		0       /* has not been found */

Just idle curiousity (I am unfamiliar with these drivers), I wonder if
it's possible for the ihphy to be detached twice?  Perhaps it can be 
detached by config_detach_all() and then the wm driver tries to detach 
again?


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