Ubuntu
linux-restricted-modules package

2.6.27 REGRESSION, hangs during boot while preparing restricted drivers when ath_hal is blacklisted

Bug #262539 reported by Matt Zimmerman
18
Affects Status Importance Assigned to Milestone
linux-restricted-modules (Ubuntu)
Fix Released
High
Ben Collins
Ubuntu intrepid-alpha-6
Intrepid
Fix Released
High
Ben Collins
Ubuntu intrepid-alpha-6

Bug Description

I was running happily with 2.6.26, upgraded to 2.6.27-1.2, and my system failed to boot. It hung during /etc/init.d/linux-restricted-modules-common, and this was reproducible after a hard reset. Booting 2.6.26 via "last successful boot" works fine.

I will attach screenshots showing a sysrq+t trace at the point where it hangs.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
NonfreeKernelModules: nvidia
Package: linux-image-2.6.26-5-generic 2.6.26-5.17 [modified: lib/modules/2.6.26-5-generic/modules.pcimap lib/modules/2.6.26-5-generic/modules.dep lib/modules/2.6.26-5-generic/modules.ieee1394map lib/modules/2.6.26-5-generic/modules.usbmap lib/modules/2.6.26-5-generic/modules.isapnpmap lib/modules/2.6.26-5-generic/modules.seriomap lib/modules/2.6.26-5-generic/modules.alias lib/modules/2.6.26-5-generic/modules.symbols]
ProcCmdLine: root=UUID=daf1bf61-d974-4e90-b2c7-5f4dfa4e56cf ro quiet splash crashkernel=384M-2G:64M@16M,2G-:128M@16M last-good-boot
ProcEnviron:
 LC_COLLATE=C
 PATH=/home/username/bin:/usr/lib/ccache:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/sbin:/usr/sbin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
ProcVersionSignature: Ubuntu 2.6.26-5.15-generic
SourcePackage: linux

Revision history for this message
Matt Zimmerman (mdz) wrote :
Matt Zimmerman (mdz)
Changed in linux:
importance: Undecided → High
Revision history for this message
Matt Zimmerman (mdz) wrote :

This looks like it's actually a userland issue in lrm-manager. The system comes up OK if I disable /etc/init.d/linux-restricted-modules-common, and I can see it go into an infinite loop when I run it manually thereafter.

The fact that lrm-manager spins this way does block the entire boot, though, so this is still a serious issue. I don't know what it is about 2.6.27 which triggers this. I'm attaching a sh -x trace showing the loop; it continues indefinitely in a similar pattern and never exits.

Revision history for this message
Matt Zimmerman (mdz) wrote :

The problem is with the DISABLED_MODULES checking. I use:

DISABLED_MODULES="ath_hal fc fglrx ltm"

(which has worked fine for ages). The problem is that every time it gets to "ath_hal" in the list, it adds "ath_hal" back:

    case "$1" in
      madwifi|ath_hal)
        set -- $@ ath_hal ath_pci ath_rate_amrr ath_rate_minstrel \
        ath_rate_onoe ath_rate_sample wlan wlan_acl \
        wlan_ccmp wlan_scan_ap wlan_scan_sta wlan_tkip \
        wlan_wep wlan_xauth
        shift

resulting in an infinite loop. I have no idea why this doesn't fail under 2.6.26. Running sudo lrm-manager --kver=2.6.26-5-generic --quick certainly does fail (running under 2.6.27).

Revision history for this message
John Dong (jdong) wrote :

Indeed this appears the case; I too am experiencing this when I have ath_hal blacklisted.

I've tried:

      madwifi)
        set -- $@ ath_hal
 shift
 ;;
      ath_hal)
       set -- $@ ath_pci ath_rate_amrr ath_rate_minstrel \
  ath_rate_onoe ath_rate_sample wlan wlan_acl \
  wlan_ccmp wlan_scan_ap wlan_scan_sta wlan_tkip \
  wlan_wep wlan_xauth
        shift
        ;;

Which works, but I'm not confident is the correct fix.

Ben Collins (ben-collins)
Changed in linux-restricted-modules:
assignee: nobody → ben-collins
milestone: none → intrepid-alpha-5
status: New → Fix Committed
Revision history for this message
Sindhudweep Sarkar (sindhudweep-sarkar) wrote :

Had same issue after upgrading to intrepid while using a custom ath_hal for my ATH5006x wifi card.

Revision history for this message
Grzegorz Sterniczuk (dzikus) wrote :

Me too, but with DISABLED_MODULES="madwifi fc ltm nv wl".

Revision history for this message
Steve Langasek (vorlon) wrote :

Postponed to alpha-6; this issue is specific to upgrades from Ubuntu 8.04 in which the user has blacklisted the module, and should not block the alpha milestone.

Changed in linux-restricted-modules:
milestone: intrepid-alpha-5 → intrepid-alpha-6
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux-restricted-modules - 2.6.27-2.3

---------------
linux-restricted-modules (2.6.27-2.3) intrepid; urgency=low

  [Ben Collins]

  * build/lrm-manager: Fix endless loop for ath_hal
    - LP: #262539
  * broadcom: Force vlan_mode to off on initialization of device
  * build/control: Provides/Conflicts/Replaces atmel-firmware
    - LP: #263021

 -- Ben Collins <email address hidden> Fri, 05 Sep 2008 08:56:26 -0400

Changed in linux-restricted-modules:
status: Fix Committed → Fix Released
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