kern/118316: ath/snd_hda on the same irq line cause solid hang

Kostik Belousov kib at
Wed Nov 28 10:30:02 PST 2007

>Number:         118316
>Category:       kern
>Synopsis:       ath/snd_hda on the same irq line cause solid hang
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Nov 28 18:30:01 UTC 2007
>Originator:     Kostik Belousov
>Release:        7.0-BETA3
FreeBSD alf 7.0-BETA3 FreeBSD 7.0-BETA3 #46: Tue Nov 27 21:47:09 EET 2007     root at alf:/usr/bsd/obj/usr/bsd/src/sys/ALF  i386
I have a laptop that shares interrupt between ath0 and snd_hda0 devices.
Machine worked normally under the RELENG_6. Now, on the RELENG_7 (and
CURRENT), attempt to ifconfig ath0 up usualy hangs the machine in the
next 2-5 minutes.

Hang is hard, I even cannot switch the console to look at the kernel            
messages or enter the ddb. Also, laptop does not have a serial port or

Not setting the ath0 up, or, unloading snd_hda.ko before activating
the interface, allows machine to work. Wireless works without problem,
interrupt rate is as expected.

hostb0 at pci0:0:0:0:	class=0x060000 card=0x00901025 chip=0x27a08086 rev=0x03 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '955XM/945GM/PM/GMS/940GML Express Processor to DRAM Controller'
    class      = bridge
    subclass   = HOST-PCI
pcm0 at pci0:0:27:0:	class=0x040300 card=0x00901025 chip=0x27d88086 rev=0x02 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82801G (ICH7 Family) High Definition Audio'
    class      = multimedia
ath0 at pci0:6:2:0:	class=0x020000 card=0x04181468 chip=0x001a168c rev=0x01 hdr=0x00
    vendor     = 'Atheros Communications Inc.'
    device     = 'Atheros AR5005G Atheros AR5005G 802.11abg NIC Chipset / TP-Link (TL-WN551G)'
    class      = network
    subclass   = ethernet

wlan: <802.11 Link Layer>
wlan: <802.11 MAC ACL support>
wlan: mac acl policy registered
wlan_amrr: <AMRR Transmit Rate Control Algorithm>
ath_hal: (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
ath_rate: version 1.2 <SampleRate bit-rate selection algorithm>
pci0: driver added
found->	vendor=0x8086, dev=0x27da, revid=0x02
	domain=0, bus=0, slot=31, func=3
	class=0c-05-00, hdrtype=0x00, mfdev=0
	cmdreg=0x0101, statreg=0x0280, cachelnsz=0 (dwords)
	lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
	intpin=b, irq=19
pci0:0:31:3: reprobing on driver added
pci2: driver added
pci3: driver added
pci4: driver added
pci5: driver added
pci6: driver added
found->	vendor=0x168c, dev=0x001a, revid=0x01
	domain=0, bus=6, slot=2, func=0
	class=02-00-00, hdrtype=0x00, mfdev=0
	cmdreg=0x0002, statreg=0x0290, cachelnsz=0 (dwords)
	lattimer=0x00 (0 ns), mingnt=0x0a (2500 ns), maxlat=0x1c (7000 ns)
	intpin=a, irq=22
	powerspec 2  supports D0 D3  current D0
pci0:6:2:0: reprobing on driver added
ath0: <Atheros 5212> mem 0xd0000000-0xd000ffff irq 22 at device 2.0 on pci6
ath0: Reserved 0x10000 bytes for rid 0x10 type 3 at 0xd0000000
ath0: [MPSAFE]
ath0: [ITHREAD]
ath0: hal channel 2412/a0 -> 1
ath0: hal channel 2412/c0 -> 1
ath0: hal channel 2417/a0 -> 2
ath0: hal channel 2417/c0 -> 2
ath0: hal channel 2422/a0 -> 3
ath0: hal channel 2422/c0 -> 3
ath0: hal channel 2427/a0 -> 4
ath0: hal channel 2427/c0 -> 4
ath0: hal channel 2432/a0 -> 5
ath0: hal channel 2432/c0 -> 5
ath0: hal channel 2437/a0 -> 6
ath0: hal channel 2437/c0 -> 6
ath0: hal channel 2442/a0 -> 7
ath0: hal channel 2442/c0 -> 7
ath0: hal channel 2447/a0 -> 8
ath0: hal channel 2447/c0 -> 8
ath0: hal channel 2452/a0 -> 9
ath0: hal channel 2452/c0 -> 9
ath0: hal channel 2457/a0 -> 10
ath0: hal channel 2457/c0 -> 10
ath0: hal channel 2462/a0 -> 11
ath0: hal channel 2462/c0 -> 11
ath0: hal channel 2467/2a0 -> 12
ath0: hal channel 2467/2c0 -> 12
ath0: hal channel 2472/2a0 -> 13
ath0: hal channel 2472/2c0 -> 13
ath0: using obsoleted if_watchdog interface
ath0: bpf attached
ath0: Ethernet address: 00:19:7d:74:58:c9
ath0: bpf attached
ath0: bpf attached
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: mac 7.8 phy 4.5 radio 5.6
ath0: Use hw queue 1 for WME_AC_BE traffic
ath0: Use hw queue 0 for WME_AC_BK traffic
ath0: Use hw queue 2 for WME_AC_VI traffic
ath0: Use hw queue 3 for WME_AC_VO traffic
ath0: Use hw queue 8 for CAB traffic
ath0: Use hw queue 9 for beacons

snd_unit_init() u=0x00ff8000 [512] d=0x00007c00 [32] c=0x000003ff [1024]
feeder_register: snd_unit=-1 snd_maxautovchans=16 latency=5 feeder_buffersize=16
384 feeder_rate_min=1 feeder_rate_max=2016000 feeder_rate_round=25
pci0: driver added
found-> vendor=0x8086, dev=0x27d8, revid=0x02
        domain=0, bus=0, slot=27, func=0
        class=04-03-00, hdrtype=0x00, mfdev=0
        cmdreg=0x0106, statreg=0x0010, cachelnsz=16 (dwords)
        lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
        intpin=a, irq=22
        powerspec 2  supports D0 D3  current D0
        MSI supports 1 message, 64 bit
pci0:0:27:0: reprobing on driver added
pcm0: <Intel 82801G High Definition Audio Controller> mem 0xd0240000-0xd0243fff
irq 22 at device 27.0 on pci0
pcm0: TCSEL: 0x07 -> 0x00
pcm0: DMA Coherency: Uncacheable / vendor=0x8086
pcm0: Reserved 0x4000 bytes for rid 0x10 type 3 at 0xd0240000
ioapic0: routing intpin 22 (PCI IRQ 22) to vector 57
pcm0: [MPSAFE]
pcm0: [ITHREAD]

Everything wlan/ath/snd is loaded as modules.

alf% uname -a
FreeBSD alf 7.0-BETA3 FreeBSD 7.0-BETA3 #46: Tue Nov 27 21:47:09 EET 2007     root at alf:/usr/bsd/obj/usr/bsd/src/sys/ALF  i386

Kernel config:

# $Id: ALF.kernconf,v 1.7 2007/11/25 11:25:07 root Exp root $

machine		i386
cpu		I686_CPU
device		apic
options		HWPMC_HOOKS
options		INTR_FILTER

ident		ALF

makeoptions	DEBUG=-g		#Build kernel with gdb(1) debug symbols

options 	KDB
options 	KDB_TRACE
options 	DDB
options 	DDB_NUMSYM

options 	INET			#InterNETworking
options 	INET6			#IPv6 communications protocols
options		IPSTEALTH               #support for stealth forwarding
options		TCPDEBUG
options		IPSEC
options		SCTP

options 	ALTQ
options 	ALTQ_CBQ	# Class Bases Queueing
options 	ALTQ_RED	# Random Early Detection
options 	ALTQ_RIO	# RED In/Out
options 	ALTQ_HFSC	# Hierarchical Packet Scheduler
options 	ALTQ_CDNR	# Traffic conditioner
options 	ALTQ_PRIQ

options		SCHED_ULE
options 	FFS
options		UFS_EXTATTR
options		UFS_ACL
options		UFS_DIRHASH
options		QUOTA
options		SUIDDIR
options 	COMPAT_43TTY		#Compatible with BSD 4.3 [KEEP THIS!]
options 	SCSI_DELAY=15000	#Delay (in ms) before probing SCSI
options 	KTRACE			#ktrace(1) support
options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev
options		MAC
options		AUDIT

device		isa
device		pci

device		atkbdc
device		atkbd
device		psm

device		vga

# syscons is the default console driver, resembling an SCO console
device		sc
#options		SC_NO_SYSMOUSE

device		npx
device		pmtimer

device		loop
device		ether
device		mem
device		io
device		pty
device		crypto
device		bpf
device		enc




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