Date: Wed, 6 Jan 2010 22:51:05 GMT From: Michael Moll <kvedulv@kvedulv.de> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/142391: bsnmpd triggers kernel panic when a second cloned WLAN interface was created before starting Message-ID: <201001062251.o06Mp5Mc053988@www.freebsd.org> Resent-Message-ID: <201001062300.o06N0BN8089277@freefall.freebsd.org>
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>Number: 142391
>Category: kern
>Synopsis: bsnmpd triggers kernel panic when a second cloned WLAN interface was created before starting
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jan 06 23:00:11 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Michael Moll
>Release: 8.0-RELEASE
>Organization:
>Environment:
FreeBSD geode.kvedulv.de 8.0-RELEASE-p1 FreeBSD 8.0-RELEASE-p1 #0: Wed Jan 6 23:12:22 CET 2010 root@buildhost.kvedulv.de:/usr/obj/usr/src/sys/GEODE_DB i386
>Description:
I use following rc.conf entries to create a wlan0 interface:
wlans_ath0="wlan0"
create_args_wlan0="wlanmode hostap mode 11g country DE channel 3 ssid Kvedulv"
ifconfig_wlan0="inet 192.168.201.1 netmask 255.255.255.0"
ipv6_ifconfig_wlan0="2001:6f8:12f2:2::1/64"
bsnmpd is running perfectly with this config.
Now let's add a second VAP:
root@geode # ifconfig wlan1 create wlandev ath0 wlanmode hostap bssid mode 11g country DE channel 3 ssid IPV6
ifconfig: SIOCS80211: Device busy
root@geode # ifconfig wlan1 inet6 2001:6f8:12f2:3::1/64
root@geode # ifconfig wlan1 up
root@geode # ifconfig wlan1
wlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
ether 06:0b:6b:81:d4:5b
inet6 2001:6f8:12f2:3::1 prefixlen 64
inet6 fe80::40b:6bff:fe81:d45b%wlan1 prefixlen 64 scopeid 0xb
media: IEEE 802.11 Wireless Ethernet autoselect mode 11g <hostap>
status: running
ssid IPV6 channel 3 (2422 Mhz 11g) bssid 06:0b:6b:81:d4:5b
regdomain ETSI country DE ecm authmode OPEN privacy OFF txpower 30
scanvalid 60 protmode CTS wme burst dtimperiod 1 -dfs
Everything OK, until (re)starting bsnmpd:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x44
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc05c9479
stack pointer = 0x28:0xcd0e4afc
frame pointer = 0x28:0xcd0e4b6c
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 1721 (bsnmpd)
[thread pid 1721 tid 100082 ]
Stopped at sysctl_rtsock+0x4f9: movl 0x44(%eax),%eax
db> bt
Tracing pid 1721 tid 100082 td 0xc24e86c0
sysctl_rtsock(c07f60e0,cd0e4c20,4,cd0e4bac,6,...) at sysctl_rtsock+0x4f9
sysctl_root(cd0e4bac,c24e86c0,1,0,0,...) at sysctl_root+0xc7
userland_sysctl(c24e86c0,cd0e4c18,6,0,bfbfc558,0,0,0,cd0e4c78,0) at userland_sysctl+0x126
__sysctl(c24e86c0,cd0e4cf8,c07e4c78,c24e86c0,297,...) at __sysctl+0x63
syscall(cd0e4d38) at syscall+0x194
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (202, FreeBSD ELF32, __sysctl), eip = 0x281a5177, esp = 0xbfbfc48c, ebp = 0xbfbfc4c8 ---
>How-To-Repeat:
See example commands in the problem description
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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