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SubjectRe: 2.6.13-rc6 Oops with Software RAID, LVM, JFS, NFS
On Thursday August 11, phil@icglink.com wrote:
> Hi,
>
> I posted an oops a few days ago from 2.6.12.3 [1]. Here are the results
> of my tests on 2.6.13-rc6. The kernel oopses, but it the box isn't completely
> hosed; I can still log in and move around. It appears that the only things that are
> locked are the apps that were doing i/o to the test partition. More detailed info
> about my configuration can be found here:
>
> <http://www.icglink.com/debug-2.6.13-rc6.html>

You don't seem to give details on how lvm is used to combine the md
arrays, though I'm not sure that would help particularly.


>
> Here is the oops:
>
> Oops: 0000 [#1]
> SMP
> Modules linked in:
> CPU: 0
> EIP: 0060:[<c0116dd0>] Not tainted VLI
> EFLAGS: 00010207 (2.6.13-rc6)
> EIP is at kmap+0x10/0x30
> eax: 00000003 ebx: d0977440 ecx: c9efb470 edx: 00000000
> esi: c1000000 edi: 00000000 ebp: ce59d570 esp: f7adde18
> ds: 007b es: 007b ss: 0068
> Process md4_raid1 (pid: 6442, threadinfo=f7adc000 task=f70eda20)
> Stack: c014e0bd c9efb470 00000001 00000000 00000000 cb129000 00000001 e0c65f00
> f7dcbe18 087641ef 00000000 f7dcbe18 c014e146 f7dcbe18 f7addeb0 c3146940
> c033f03f f7dcbe18 f7addeb0 0021d906 00000000 0000003f 00000040 00000000
> Call Trace:
> [<c014e0bd>] __blk_queue_bounce+0x20d/0x260
--snip---
> Code: 00 40 c7 46 0c 90 30 15 c0 c7 46 10 90 31 15 c0 eb b9 90 90 90 90 90 90 90 90 90 8b 4c 24 04 8b 01 c1 e8 1e 8b 14 85 14 f4 63 c0 <8b> 82 0c 04 00 00 05 00 09 00 00 39 c2 74 05 e9 ac 73 03 00 89
>

The code is Oopsing in a call to kmap in arch/i386/highmem.c
The PageHighMem macro calls is_highmem(page_zone(page)).
page_zone is defined in mm.h
static inline struct zone *page_zone(struct page *page)
{
return zone_table[(page->flags >> ZONETABLE_PGSHIFT) &
ZONETABLE_MASK];
}

Now at the point of the crash, eax is
(page->flags >> ZONETABLE_PGSHIFT),
which is '3'. So it seems that this page is in zone 3.
However zone_table[3] is now in edx, and we can see it is '0'.
There are only 3 zones (normal, dma, highmem), so nothing should ever
by in zone 3. This page is clearly bad.

However that is as far as I can get. I don't know whether this is a
bad page pointer passed down from jfs or nfsd, a page pointer that was
corrupted by either lvm or md, or a valid page pointer that has
managed to get a bad zone number encoded in it's flags.

You could possibly put something like

struct bio_vec *from;
int i;
bio_for_each_segment(from, bio, i)
BUG_ON(page_zone(from->bv_page)==NULL);

in generic_make_requst in drivers/block/ll_rw_blk.c, just before
the call to q->make_request_fn.
This might trigger the bug early enough to see what is happening.


>
> Thanks for looking..
>

Thanks for testing.

NeilBrown
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