[BUG] 2.4.0-test11-ac3 breaks raid autodetect (was Re: [BUG] raid5 link error? (was [PATCH] raid5 fix after xor.c cleanup))

[Friedrich Lobenstock <fl@fl.priv.at>]

Neil Brown wrote:
>
> The following patch changes the link order in the Makefile so that xor
> is initiailised before md tries to autostart anything.
> It also takes the theme a bit further and uses module_init/module_exit
> to init and shutdown the raid personalities.  This allows us to remove
> the explicit calls to raidXX_init from md.c, which is nice.
> 
> I have tested this patch both
>    1/ monolithic kernel and autodetecting an array
>    2/ md and all personalities modules
> 
> and it works fine.

Sorry to tell you that I just tried linux-2.4.0-test11-ac3 (which has this
patch) and I couldn't boot because the kernel detects the raid1 devices
but kicks the shortly after. I had to back out this code.

Here how the messages look like:

ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
ide2 at 0xa400-0xa407,0xa002 on irq 9
hda: 20044080 sectors (10263 MB) w/418KiB Cache, CHS=19885/16/63, UDMA(33)
hdc: 20044080 sectors (10263 MB) w/418KiB Cache, CHS=19885/16/63, UDMA(33)
hde: 58633344 sectors (30020 MB) w/418KiB Cache, CHS=58168/16/63, UDMA(66)
Partition check:
 hda: hda1 hda2
 hdc: hdc1 hdc2 hdc3
 hde: hde1
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
LVM version 0.8final  by Heinz Mauelshagen  (15/02/2000)
lvm -- Driver successfully initialized
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 640k freed
Serial driver version 5.02 (2000-08-09) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
SCSI subsystem driver Revision: 1.00
request_module[scsi_hostadapter]: Root fs not mounted
md driver 0.90.0 MAX_MD_DEVS=256, MAX_REAL=12
md.c: sizeof(mdp_super_t) = 4096
autodetecting RAID arrays
(read) hda1's sb offset: 51264 [events: 00000056]
(read) hda2's sb offset: 9970560 [events: 00000051]
(read) hde1's sb offset: 29316544 [events: 00000080]
autorun ...
considering hde1 ...
  adding hde1 ...
created md2
bind<hde1,1>
running: <hde1>
now!
hde1's event counter: 00000080
md: device name has changed from [dev 22:01] to hde1 since last import!
md2: former device hde1 is unavailable, removing from array!
request_module[md-personality-3]: Root fs not mounted
do_md_run() returned -22
md2 stopped.
unbind<hde1,0>
export_rdev(hde1)
considering hda2 ...
  adding hda2 ...
created md1
bind<hda2,1>
running: <hda2>
now!
hda2's event counter: 00000051
md1: former device hdc2 is unavailable, removing from array!
request_module[md-personality-3]: Root fs not mounted
do_md_run() returned -22
md1 stopped.
unbind<hda2,0>
export_rdev(hda2)
considering hda1 ...
  adding hda1 ...
created md0
bind<hda1,1>
running: <hda1>
now!
hda1's event counter: 00000056
md0: former device hdc1 is unavailable, removing from array!
request_module[md-personality-3]: Root fs not mounted
do_md_run() returned -22
md0 stopped.
unbind<hda1,0>
export_rdev(hda1)
... autorun DONE.
raid1 personality registered
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 2048 buckets, 16Kbytes
TCP: Hash tables configured (established 32768 bind 32768)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
VFS: Mounted root (ext2 filesystem).
VFS: Mounted root (ext2 filesystem) readonly.
change_root: old root has d_count=3


MfG / Regards
Friedrich Lobenstock
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