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kern/50206: panic: mii_anar -- setting media for alc(4)

>Number:         50206
>Category:       kern
>Synopsis:       panic: mii_anar -- setting media for alc(4)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 04 09:45:00 +0000 2015
>Originator:     matthew green
>Release:        NetBSD 7.99.21
people's front against (bozotic) www (softwar foundation)
System: NetBSD 6.1_STABLE NetBSD 6.1_STABLE (_splode_) #3: Sun Jul 26 21:53:08 EST 2015 sparc64
Architecture: sparc64
Machine: sparc64

	actually my kernel is an amd64 laptop, the above is my send-pr host.


	i installed -current kernel on an asus laptop with a recent alc(4)

	alc0 at pci3 dev 0 function 0: Atheros AR8162 PCIe Fast Ethernet
	alc0: interrupting at ioapic0 pin 19
	atphy0 at alc0 phy 0: Atheros AR8035 10/100/1000 PHY, rev. 9

	i tried to run "ifconfig alc0 media 100baseTX mediaopt full-duplex"
	and i got the following panic:

	System panicked: mii_anar
	Backtrace from time of crash is available.
	crash> bt
	?() at fffffe807864fdd8
	panic() at panic
	snprintf() at snprintf
	mii_anar() at mii_anar+0x17
	atphy_service() at atphy_service+0x134
	mii_mediachg() at mii_mediachg+0x31
	ifmedia_ioctl() at ifmedia_ioctl+0x96
	alc_ioctl() at alc_ioctl+0x3a
	doifioctl() at doifioctl+0x56e
	soo_ioctl() at soo_ioctl+0x23e
	sys_ioctl() at sys_ioctl+0x253
	syscall() at syscall+0xd2
	--- syscall (number 54) ---


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