Bug 471
| Summary: | Root on software raid don't boot on new 2.5 kernel since after 2.5.45 | ||
|---|---|---|---|
| Product: | IO/Storage | Reporter: | Troels Liebe Bentsen (tlb) |
| Component: | MD | Assignee: | Daniele Venzano (venza) |
| Status: | CLOSED CODE_FIX | ||
| Severity: | high | CC: | eric |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.5.65 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
I'm getting the same, however at boot the kernel goes to autodetect the md's and finds nothing. In my case, am running raid1 on / with ext3 on Debian Unstable Sorry for the long wait, Yes is was using devfs and lilo, and that was the problem "/dev/md/2" vs. /dev/md2, but should it hang?, and also it looks like lilo resolves to some dev number, it then pases to the kernel when the root= option is used, but this number has apprently changed from 2.4 til 2.5, i don't know if this should be viewed as a kernel bug or just the realization that i should be useing grub instead. Also would there be any problem in still supporting lilo's way of doing things, ie. the device number thing. And for people who use a less broaken bootloader, why not allow them to use the old /dev/md[0-9] kind of root even if devfs support is compilled in, like in 2.4. This bug is still present on kernel 2.5.74. I have three RAID-1 md devices with the root on /dev/md2. Linux won't boot saying that he can't find /dev/md2 and that a correct root= parameter should be specified. The md devices get correctly autoprobed and activated before the boot stops. I've tried with devfs and GRUB (so it's not LILO related). I'll try without devfs and report if there'll be something new. Just tried 2.6.0-test1 without devfs and it works, so it seems a devfs problem. Will someone ever fix (or just look into) this bug ? I just don't know anything on that part of the kernel... Doesn't look like a bug to me. 2.4 devfs also uses /dev/md/0 /dev/md/1 /dev/md/2 etc This patch from Andrew Morton fixes the bug, with this the kernel boots fine
with root=/dev/mdX as boot option.
Thanks also to Andrey Borzenko who helped finding the problem.
diff -puN init/do_mounts_devfs.c~read_dir-fix init/do_mounts_devfs.c
--- 25/init/do_mounts_devfs.c~read_dir-fix 2003-07-28 00:21:40.000000000 -0700
+++ 25-akpm/init/do_mounts_devfs.c 2003-07-28 00:21:40.000000000 -0700
@@ -54,7 +54,7 @@ static void * __init read_dir(char *path
if (fd < 0)
return NULL;
- for (size = 1 << 9; size <= (1 << MAX_ORDER); size <<= 1) {
+ for (size = 1 << 9; size <= (PAGE_SIZE << MAX_ORDER); size <<= 1) {
void *p = kmalloc(size, GFP_KERNEL);
int n;
if (!p)
|
Distribution: Linux Mandrake 9.0 (std kernel 2.4.21-pre1) Hardware Environment: ASUS A7M266-D ACPI BIOS Revision 1006 Promise 20268 PCI IDE Controler Intel Ethernet Pro 100 ATI Radeon QD Problem Description: The software raid setup I have boots on 2.4 but not on newer 2.5 kernels, i have everything need compiled in and the 2.5 kernel also rapports that it has found /dev/md2 but it rapports that is's unable to mount the root partition for this device. I have tried to pass /dev/md0 as the root but this hangs the kernel, is root on raid broaken in kernel 2.5 or am I doing something wrong? lilo: image=/boot/vmlinuz-2.4.21-pre1 label=linux root=/dev/md2 read-only append=" devfs=mount" image=/boot/vmlinuz-2.5.65 label=linux25 root=/dev/md2 read-only append=" devfs=mount" fdisk: /dev/hda1 1 20318 10240240+ 7 HPFS/NTFS /dev/hda2 20319 116301 48375432 5 Extended /dev/hda5 20319 20522 102784+ 83 Linux /dev/hda6 20523 22554 1024096+ 83 Linux /dev/hda7 22555 116301 47248456+ fd Linux raid autodetect mdadm: # UUID removed #devices=/dev/hdd5,/dev/hdc5 ARRAY /dev/md0 level=raid1 num-devices=2 #devices=/dev/hdd6,/dev/hdc6 ARRAY /dev/md1 level=raid1 num-devices=2 #devices=/dev/hdd7,/dev/hdc7 ARRAY /dev/md2 level=raid1 num-devices=2 #devices=/dev/hdg5,/dev/hde5 ARRAY /dev/md3 level=raid0 num-devices=2 mount: /dev/md0 on /boot type ext3 (rw) /dev/md2 on / type reiserfs (rw,notail) /dev/md3 on /dist type reiserfs (rw,notail) fstab: /dev/md2 / reiserfs notail 1 1 /dev/md0 /boot ext3 defaults 1 2 /dev/md1 swap swap defaults 0 0 /dev/md3 /dist reiserfs notail 1 1