On 03/07/2010 07:11 PM, Antoine Martin wrote:
the problem happens right at startup, it can't read _anything_
at all from the disk. In my case, the problem is intermittent
and happens under high load only, hence the big difference.
But anyway, this is something which should be easy to find
out. Run kvm under `strace -f' and see how it opens the
device, or find out with lsof what filedescriptor corresponds
to the file in question (in running kvm instance) and see
flags in /proc/$kvm_pid/fdinfo/$fdnum.
...
[...]
stat("./vm/var_fs", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 41),
...}) = 0
open("./vm/var_fs", O_RDWR|O_DIRECT|O_CLOEXEC) = 12
lseek(12, 0, SEEK_END) = 1321851815424
[..]
So it opens it the device without problems.
The only things that stands out is this before the "read failed" message:
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9121] pread(12, 0x7fa50a0e47d0, 2048, 0) = -1 EINVAL (Invalid
argument)
The buffer is unaligned here, yet the file was opened with O_DIRECT
(cache=none). This is strange, since alignment is not related to disk size.
--
error compiling committee.c: too many arguments to function
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