hostapd 0.7.2 segmentation fault

[Dan Williams]

On Wed, 2010-05-26 at 16:34 +0900, Alan wrote:
> Hello,
> 
> I get a segmentation fault every time I try to run hostapd version
> 0.7.2.  Version 0.6.10 works fine.
> 
> My hardware is: Atheros AR5008
> Linux is 2.6.34 and I'm using madwifi from subversion, release 4129.
> I built hostapd using the same source of madwifi as I'm using for the
> kernel module.
> ath_pci.ko parameters are: countrycode=840 autocreate=ap
> I don't change anything via sysctl or iwpriv.
> ath0 is in a bridge with other 3 network interfaces.
> 
> This is my /etc/hostapd.conf file:
> --------------------
> ctrl_interface=/var/run/hostapd
> #driver=nl80211
> driver=madwifi
> bridge=br0
> interface=ath0
> ssid=r1
> hw_mode=g
> ieee80211n=1
> ht_capab=[HT40-][SHORT-GI-40][DSSS_CCK-40][AMPDU]
> # no sirve: ht_capab=[HT40-][HT40+][SHORT-GI-40][DSSS_CCK-40]
> channel=11
> 
> auth_algs=3
> wpa=3
> wpa_passphrase=chavez sucks
> wpa_key_mgmt=WPA-PSK
> wpa_pairwise=TKIP
> rsn_pairwise=CCMP
> --------------------
> 
> This is a gdb backtrace:
> 
> (gdb) run -B -P /var/run/hostapd.pid /etc/hostapd.conf
> Starting program: /usr/sbin/hostapd -B -P /var/run/hostapd.pid /etc/hostapd.conf
> Configuration file: /etc/hostapd.conf
> Using interface ath0 with hwaddr 00:23:6c:be:e3:eb and ssid 'r1'
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x0809a840 in hostapd_eid_ht_capabilities (hapd=0x80b2db8,
> eid=0x80b3abe "-\032N\020") at ../src/ap/ieee802_11_ht.c:42
> 42              cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;

When you get here, grab the output of the following too:

print hapd
print hapd->iface
print hapd->iface->current_mode

to get an idea of exactly what is causing the segfault.

Dan

> (gdb) bt
> #0  0x0809a840 in hostapd_eid_ht_capabilities (hapd=0x80b2db8,
> eid=0x80b3abe "-\032N\020") at ../src/ap/ieee802_11_ht.c:42
> #1  0x08094d4c in ieee802_11_set_beacon (hapd=0x80b2db8) at
> ../src/ap/beacon.c:418
> #2  0x080530f9 in hostapd_setup_bss (hapd=0x80b2db8, first=1) at
> ../src/ap/hostapd.c:611
> #3  0x08053535 in hostapd_setup_interface_complete (iface=0x80b23e0,
> err=0) at ../src/ap/hostapd.c:739
> #4  0x08053321 in setup_interface (iface=0x80b23e0) at ../src/ap/hostapd.c:685
> #5  0x08053606 in hostapd_setup_interface (iface=0x80b23e0) at
> ../src/ap/hostapd.c:776
> #6  0x0804d280 in hostapd_interface_init (interfaces=0xbffff720,
> config_fname=0xbffff976 "/etc/hostapd.conf", debug=0) at main.c:313
> #7  0x0804d666 in main (argc=5, argv=0xbffff814) at main.c:541
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