On Tue, Nov 14, 2006 at 10:42:16AM +0000, Ewan Mellor wrote:
> On Mon, Nov 13, 2006 at 09:23:52PM -0800, John McCullough wrote:
>
> > Hello,
> >
> > I am working on forking hvm domains and I have been using xenstore to
> > send commands to qemu. I have noticed that occasionally qemu's watch is
> > not read. I am using the qemu fd handler methods. I have been trying
> > to duplicate the missed read outside of qemu and the rest of xend, but I
> > haven't been able to. However, I think I may have discovered a memory
> > leak in lowlevel/xs/xs.c.
> >
> > I am attaching:
> > - commandee.c : consumer of "commands"
> > - commander.py : issuer of commands
> > - xsblockingchannel.py : com channel for the commander
> >
> > I am working against a changset from midsummer (11536:041be3f6b38e)
> > since I'm trying to iron out some of my bugs before moving forward in
> > the revisions.
> >
> > % gcc -o commandee commandee.c /usr/lib/libxenstore.a -lpthread
> > % sudo ./commandee > /dev/null
> > % time sudo python commander.py > /dev/null #(in separate terminal)
> > Traceback (most recent call last):
> > File "commander.py", line 9, in ?
> > xsbc = xsblockingchannel.xsblockingchannel("test")
> > File "/net/xen/xsstress/xsblockingchannel.py", line 19, in __init__
> > self.xs.watch(self.path, self)
> > xen.lowlevel.xs.Error: (12, 'Cannot allocate memory')
> > Exception xen.lowlevel.xs.Error: (2, 'No such file or
> > directory') in <bound method xsblockingchannel.__del__ of
> > <xsblockingchannel.xsblockingchannel instance at 0xb7ce448c>>
> > ignored
> >
> > 1.02s user 5.00s system 8% cpu 1:08.61 total
>
> I can't remember the details, but I have vague recollection of a
> Xenstore-related problem where the error was ENOMEM, but that error was
> misleading.
The problem I was thinking was a misleading ENOSPC, not a misleading ENOMEM
(and we've since fixed the ENOSPC). It looks like your ENOMEM might be real.
Ewan.
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