Bug#389026: madwifi-source: Kernel 2.6.18 panics upon reboot

[Peter Colberg]

(This message is a smaller copy of the report in the BTS for approval
on the pkg-madwifi-maintainers list, without the System.map and kernel
config files and with a mention of my hardware.
Sorry for having forgotten to compress them in the first place.)

Package: madwifi-source
Version: 0.svnr1697.0.9.2-1
Severity: important

Upgrading from kernel 2.6.17 to 2.6.18, I now receive a kernel panic
upon reboot with the madwifi modules in use. This happens somewhere
in the final stages of the reboot, after all processes have been
killed.

I hunted down a way to work around the panic: If I terminate my WLAN
connection before rebooting by manually executing "wpa_action ath0
stop", the kernel reboots flawlessly. So the panic seems to occur only
if the ath_pci module is still in use upon rebooting.

The latest upstream version (svn r1730) shows the same behavior.

I am employing wpasupplicant 0.5.4-5 with the madwifi driver.


Following are the last (hand-copied) kernel messages after the panic.

Regards,
Peter

-- Update: Hardware
The WLAN card in question is an Atheros AR5212 802.11abg (in a ThinkPad X40).


-- kernel 2.6.18 panic messages
CPU:    0
EIP:    0060:[<30202020>]    Tainted: P      VLI
EFLAGS: 00010286   (2.6.18-alcyone #1)
EIP is at 0x30202020
eax: b03a6000   ebx: 00000102   ecx: b03a6000   edx: 00000102
esi: b03d9600   edi: 30202020   ebp: 20202020   esp: b03a7f4c
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 0, ti=b03a6000 task=b0351b20 task.ti=b03a6000)
Stack: b011bf8c 20202020 b03ed92c b03ed92c 00000001 b03d9388 0000000a dff7a000
       b0118c28 b03d9388 00000046 b03a7f9c dff7a11c b0118c95 00000000 b0118e52
       b0104582 00ab6558 00ab2d88 b0102eae 00ab6558 b03a6000 00000001 00ab2d88
Call Trace:
 [<b011bf8c>] run_timer_softirq+0x103/0x175
 [<b0118c28>] __do_softirq+0x3f/0x85
 [<b0118c95>] do_softirq+0x27/0x2b
 [<b0118e52>] irq_exit+0x2d/0x37
 [<b0104582>] do_IRQ+0x41/0x49
 [<b0102eae>] common_interrupt+0x1a/0x20
 [<b021c5e2>] acpi_processor_idle+0x1ac/0x312
 [<b010193b>] cpu_idle+0x3e/0x67
 [<b03a8632>] start_kernel+0x298/0x29a
Code:  Bad EIP value.
EIP: [<30202020>] 0x30202020 SS:ESP 0068:b03a7f4c
 <0>Kernel panic - not syncing: Fatal exception in interrupt


-- /etc/network/interfaces (WLAN-relevant parts)
auto ath0
iface ath0 inet manual
    wpa-driver madwifi
    wpa-roam /etc/wpa_supplicant.conf
    pre-up iwpriv ath0 mode 3
    pre-up iwpriv ath0 bgscan 0

iface default inet dhcp
    metric 1


-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (400, 'testing'), (50, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-alcyone
Locale: LANG=C, LC_CTYPE=de_DE at euro (charmap=ISO-8859-15)

Versions of packages madwifi-source depends on:
ii  bzip2                         1.0.3-6    high-quality block-sorting file co
ii  debhelper                     5.0.37.3   helper programs for debian/rules
ii  module-assistant              0.10.6     tool to make module package creati

madwifi-source recommends no packages.

-- no debconf information