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Bug#686517: marked as done (initramfs-tools: module bridge loaded although blacklisted)

Your message dated Sun, 02 Sep 2012 18:14:23 +0100
with message-id <1346606063.7787.16.camel@deadeye.wl.decadent.org.uk>
and subject line Re: Bug#686517: initramfs-tools: module bridge loaded although blacklisted
has caused the Debian Bug report #686517,
regarding initramfs-tools: module bridge loaded although blacklisted
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
686517: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686517
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: initramfs-tools
Version: 0.99~bpo60+1
Severity: normal

Dear Maintainer,
in order to run openvswitch as bridge replacement, I tried to disable the kernel bridge module the usual way: I created a file /etc/modprobe.d/bridge.conf with the content "blacklist bridge"
Then I ran update-initramfs
The freshly booted machine still had bridge loaded, which interferes with openvswitch working, especially brcompat.
I had to remove the kernel module, depmod and update-initramfs to get rid of bridge.

I suspect initramfs-tools to ignore the blacklist, because when I just removed the module but didn't run update-initramfs I saw the log message "bridge not found".

-- Package-specific info:
-- initramfs sizes
-- /proc/cmdline
placeholder root=UUID=582f6350-7bb1-4dc8-b254-5755e515b48c ro quiet

-- /proc/filesystems
	ext3
	ext4
	fuseblk
	iso9660

-- lsmod
Module                  Size  Used by
nls_utf8               12456  0 
loop                   22699  0 
isofs                  35000  0 
dm_round_robin         12644  1 
xen_gntdev             12953  0 
xen_evtchn             12874  1 
xenfs                  17607  1 
ib_iser                31570  0 
rdma_cm                31343  1 ib_iser
ib_cm                  30983  1 rdma_cm
iw_cm                  13052  1 rdma_cm
ib_sa                  26388  2 rdma_cm,ib_cm
ib_mad                 35863  2 ib_cm,ib_sa
ib_core                48070  6 ib_iser,rdma_cm,ib_cm,iw_cm,ib_sa,ib_mad
ib_addr                12838  1 rdma_cm
iscsi_tcp              17628  3 
libiscsi_tcp           17399  1 iscsi_tcp
libiscsi               35739  3 ib_iser,iscsi_tcp,libiscsi_tcp
scsi_transport_iscsi    39200  4 ib_iser,iscsi_tcp,libiscsi
crc32c                 12656  4 
drbd                  191530  5 
lru_cache              12880  1 drbd
cn                     12933  1 drbd
iptable_filter         12536  1 
ip_tables              21818  1 iptable_filter
x_tables               18918  2 iptable_filter,ip_tables
brcompat_mod           13005  0 
openvswitch_mod        67502  2 brcompat_mod
fuse                   61427  1 
nfsd                  218618  2 
nfs                   313304  0 
lockd                  66785  2 nfsd,nfs
fscache                36129  1 nfs
auth_rpcgss            36848  2 nfsd,nfs
nfs_acl                12511  2 nfsd,nfs
sunrpc                175670  6 nfsd,nfs,lockd,auth_rpcgss,nfs_acl
ext4                  355363  1 
jbd2                   60877  1 ext4
crc16                  12343  1 ext4
dm_multipath           21939  2 dm_round_robin
scsi_dh                13236  1 dm_multipath
blktap                 23825  0 
iscsi_trgt             72390  4 
tpm_tis                17315  0 
tpm                    17841  1 tpm_tis
tpm_bios               12903  1 tpm
sp5100_tco             12864  0 
amd64_edac_mod         22038  0 
k10temp                12611  0 
snd_pcm                67465  0 
snd_timer              22658  1 snd_pcm
snd                    52458  2 snd_pcm,snd_timer
soundcore              13014  1 snd
snd_page_alloc         12969  1 snd_pcm
i2c_piix4              12536  0 
pcspkr                 12579  0 
edac_core              35035  4 amd64_edac_mod
edac_mce_amd           17103  1 amd64_edac_mod
evdev                  17512  0 
joydev                 17138  0 
i2c_core               23766  1 i2c_piix4
processor              27588  0 
thermal_sys            17992  1 processor
button                 12895  0 
ext3                  160741  1 
jbd                    55645  1 ext3
mbcache                12930  2 ext4,ext3
dm_mod                 63050  19 dm_multipath
raid456                51931  1 
async_raid6_recov      12507  1 raid456
async_pq               12559  2 raid456,async_raid6_recov
raid6_pq               86619  2 async_raid6_recov,async_pq
async_xor              12385  3 raid456,async_raid6_recov,async_pq
xor                    12556  1 async_xor
async_memcpy           12350  2 raid456,async_raid6_recov
async_tx               12566  5 raid456,async_raid6_recov,async_pq,async_xor,async_memcpy
raid1                  30440  2 
md_mod                 87021  5 raid456,raid1
sg                     25769  0 
sr_mod                 21824  0 
sd_mod                 35644  17 
cdrom                  35139  1 sr_mod
crc_t10dif             12348  1 sd_mod
ata_generic            12479  0 
usbhid                 39946  0 
hid                    80937  1 usbhid
ohci_hcd               26311  0 
ahci                   24997  8 
libahci                22714  1 ahci
pata_atiixp            12729  2 
ehci_hcd               39586  0 
libata                139579  4 ata_generic,ahci,libahci,pata_atiixp
scsi_mod              161684  9 ib_iser,iscsi_tcp,libiscsi,scsi_transport_iscsi,scsi_dh,sg,sr_mod,sd_mod,libata
e1000e                128116  0 
usbcore               127444  4 usbhid,ohci_hcd,ehci_hcd
usb_common             12354  1 usbcore

-- /etc/initramfs-tools/modules
md_mod
raid1

-- /etc/initramfs-tools/initramfs.conf
MODULES=most
BUSYBOX=y
KEYMAP=n
COMPRESS=gzip
BOOT=local
DEVICE=
NFSROOT=auto

-- /etc/initramfs-tools/update-initramfs.conf
update_initramfs=yes
backup_initramfs=no

-- /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] 
md2 : active raid6 sdc3[0] sdb3[5] sda3[4] sdf3[6] sde3[2] sdd3[1]
      3860166656 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU]
      
md1 : active raid1 sdc2[0] sde2[2]
      1951732 blocks super 1.2 [2/2] [UU]
      
md0 : active raid1 sdc1[0] sde1[2]
      9763768 blocks super 1.2 [2/2] [UU]
      
unused devices: <none>

-- mkinitramfs hooks
/etc/initramfs-tools/hooks/:

/usr/share/initramfs-tools/hooks:
busybox
dmsetup
iscsi
keymap
klibc
lvm2
mdadm
thermal
udev


-- System Information:
Debian Release: 6.0.5
  APT prefers stable
  APT policy: (990, 'stable'), (100, 'stable-updates'), (100, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-0.bpo.2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/dash

Versions of packages initramfs-tools depends on:
ii  cpio               2.11-4
ii  findutils          4.4.2-1+b1
ii  klibc-utils        1.5.20-1+squeeze1
ii  module-init-tools  3.12-2
ii  udev               164-3

Versions of packages initramfs-tools recommends:
ii  busybox  1:1.17.1-8

Versions of packages initramfs-tools suggests:
ii  bash-completion  1:2.0-1

-- no debconf information

--- End Message ---
--- Begin Message --- 
On Sun, 2012-09-02 at 17:22 +0200, Andreas Pflug wrote:
> Package: initramfs-tools
> Version: 0.99~bpo60+1
> Severity: normal
> 
> Dear Maintainer,
> in order to run openvswitch as bridge replacement, I tried to disable
> the kernel bridge module the usual way: I created a
> file /etc/modprobe.d/bridge.conf with the content "blacklist bridge"
>
> Then I ran update-initramfs
> The freshly booted machine still had bridge loaded, which interferes
> with openvswitch working, especially brcompat.
> I had to remove the kernel module, depmod and update-initramfs to get
> rid of bridge.
> 
> I suspect initramfs-tools to ignore the blacklist, because when I just
> removed the module but didn't run update-initramfs I saw the log
> message "bridge not found".
[...]

I don't believe initramfs-tools ever loads the bridge module or even
includes it in the initramfs unless it's explicitly listed in
/etc/initramfs-tools/modules.  Something else is doing this.

Note that blacklisting in a file only affects loading of modules by udev
(or any other time the --use-blacklist option is used), and the bridge
module is not requested that way anyway.  Something else is directly or
indirectly requesting it, for example by running 'ip link add ... type
bridge ...'.

One obvious workaround would be to put openvswitch and brcompat in
/etc/modules.

Ben.

-- 
Ben Hutchings
Theory and practice are closer in theory than in practice.
                                - John Levine, moderator of comp.compilers

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