[uml-user] 2.6.32 / attempt to access beyond end of device

[Bram M. (Syzop) <sy...@vu...>]

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Hi,

With kernel 2.6.33, plus the sector patch posted by ja...@bo... ~24h ago in
'possible data corruption with uml guest 2.6.32', plus the PAGE_SIZE thingy
from http://marc.info/?l=user-mode-linux-devel&m=126263707311079&w=2 (as I use
a static build)

I get this when running the script from Matthias mentioned in the data
corruption thread:
attempt to access beyond end of device
ubda: rw=0, want=25821990824, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=26939250672, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=7134666488, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=25532649400, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=29418829768, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=20043484824, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=7390279568, limit=4096000
attempt to access beyond end of device
ubda: rw=0, want=26462532144, limit=4096000
[many many more]

INSIDE VM:
# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/ubd0              2015824   1934408     60936  97% /
ON HOST:
- -rw-r--r-- 1 xyz xyz 2097152000 2010-03-10 17:29 /home/xyz/root_fs
...nothing wrong with that AFAICT.

Also as you can see 'want' in the logs is waaay out of bounds.

2.6.32 on the other hand works fine (with the same two patches).
Without the sector patch I do indeed get different md5sums (on 2.6.32):
79c29688d641a0a9ab63c7c9917619ca  ./test.bin
61ea175027c3899e41620d9b15d790dd  ./test.bin
62f224dec0c8313a82134da205f505b4  ./test.bin
a7593a9ad0e6b374840adb715ccbda2c  ./test.bin
62f224dec0c8313a82134da205f505b4  ./test.bin
62f224dec0c8313a82134da205f505b4  ./test.bin

	Bram.

- --
Bram Matthys
Software developer/IT consultant        sy...@vu...
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