Subject: BUG at net/wireless/reg.c:2132 on PowerPC
From: Pavel Roskin <proski@gnu.org>
To: linux-wireless <linux-wireless@vger.kernel.org>
Content-Type: text/plain
Date: Mon, 08 Jun 2009 18:59:48 -0400
Message-Id: <1244501988.25158.57.camel@mj>
Mime-Version: 1.0
Sender: linux-wireless-owner@vger.kernel.org

Hello!

After upgrading a PowerPC system from Fedora 10 to Fedora 11, I started
getting a BUG on startup.  I'm using a self-compiled kernel from
writeless-testing.git.  The current source is affected, and so is an
older revision identified as 2.6.30-rc6-wl.

The BUS causes a long wait on startup (about 3 minutes).  Perhaps it's
caused by udev waiting for something.

mac80211 is compiled into the kernel, but ath5k is not:

$ lsmod
Module                  Size  Used by
hfs                    52980  1 
ath5k                 130428  0 
ath                     7564  1 ath5k

The system has 2 Atheros devices:

01:02.0 Ethernet controller: Atheros Communications Inc. Atheros AR5001X+ Wireless Network Adapter (rev 01)
01:03.0 Network controller: Atheros Communications Inc. Atheros AR5001X+ Wireless Network Adapter (rev 01)

That's the relevant part of the kernel log:

udevd version 127 started
ath5k 0000:01:02.0: enabling device (0014 -> 0016)
ath5k 0000:01:02.0: registered as 'phy0'
ath: EEPROM regdomain: 0x0
ath: EEPROM indicates default country code should be used
ath: doing EEPROM country->regdmn map search
ath: country maps to regdmn code: 0x3a
ath: Country alpha2 being used: US
ath: Regpair used: 0x3a
phy0: Selected rate control algorithm 'minstrel'
ath5k phy0: Atheros AR2414 chip found (MAC: 0x79, PHY: 0x45)
ath5k 0000:01:03.0: enabling device (0014 -> 0016)
ath5k 0000:01:03.0: registered as 'phy1'
ath: EEPROM regdomain: 0x0
ath: EEPROM indicates default country code should be used
ath: doing EEPROM country->regdmn map search
ath: country maps to regdmn code: 0x3a
ath: Country alpha2 being used: US
ath: Regpair used: 0x3a
cfg80211: Calling CRDA for country: US
phy1: Selected rate control algorithm 'minstrel'
ath5k phy1: Atheros AR5213A chip found (MAC: 0x59, PHY: 0x43)
ath5k phy1: RF2112B 2GHz radio found (0x46)
udev: renamed network interface wlan0 to wlan1
udev: renamed network interface wlan1_rename to wlan0
------------[ cut here ]------------
kernel BUG at /home/proski/src/linux-2.6/net/wireless/reg.c:2132!
Oops: Exception in kernel mode, sig: 5 [#1]
PowerMac
Modules linked in: ath5k ath [last unloaded: scsi_wait_scan]
NIP: c02f3eac LR: c02f3d08 CTR: 00000000
REGS: ef107aa0 TRAP: 0700   Not tainted  (2.6.30-rc8-wl)
MSR: 00029032 <EE,ME,CE,IR,DR>  CR: 88002442  XER: 20000000
TASK = ef84acb0[834] 'crda' THREAD: ef106000
GPR00: ef953840 ef107b50 ef84acb0 ef1380bc 00000006 c035a5c8 ef107b90 c035a5c8 
GPR08: 00080005 efb68980 c0445628 ef130004 28002422 10019ce0 10012d3c 00000001 
GPR16: 1070b2ac 00000005 48023558 1070b380 4802304c 00000000 ef107ddc c035a5c8 
GPR24: ef107b78 c0443350 ef8bcb00 00000005 ef138080 c04a6a70 c04a0000 ef8bcb00 
NIP [c02f3eac] set_regdom+0x4c4/0x4ec
LR [c02f3d08] set_regdom+0x320/0x4ec
Call Trace:
[ef107b50] [c02f3d08] set_regdom+0x320/0x4ec (unreliable)
[ef107b70] [c02f9d10] nl80211_set_reg+0x140/0x2d0
[ef107bc0] [c02aa2b8] genl_rcv_msg+0x204/0x228
[ef107c10] [c02a97cc] netlink_rcv_skb+0xe8/0x10c
[ef107c30] [c02aa094] genl_rcv+0x3c/0x5c
[ef107c40] [c02a9050] netlink_unicast+0x308/0x36c
[ef107c80] [c02a92bc] netlink_sendmsg+0x208/0x2f0
[ef107cd0] [c0282048] sock_sendmsg+0xac/0xe4
[ef107db0] [c02822b4] sys_sendmsg+0x234/0x2d8
[ef107f00] [c0283a88] sys_socketcall+0x108/0x258
[ef107f40] [c0012790] ret_from_syscall+0x0/0x38
--- Exception: c01 at 0xfa6b3b4
    LR = 0xfb4b5d4
Instruction dump:
80690000 4bffc1e9 2c030000 4182003c 88a30039 88830038 3c60c03c 38632a18 
4802c20d 4bfffed0 7f83e378 8403003c <0f000000> 7fe4fb78 4bffe6d1 7c7b1b79 
---[ end trace c8eebdfbe3eb31de ]---

net/wireless/reg.c:2132 is:

BUG_ON(request_wiphy->regd);

An x86_64 running Fedora 11 and the current wireless-testing kernel
doesn't exhibit this behavior.

-- 
Regards,
Pavel Roskin