I have a small VM cloning script that calls virt-sysprep. When this script
comes to the "cron-spool" action, it fails like this:

> [   9,2] Performing "cron-spool" ...
> libguestfs: trace: is_dir "/var/spool/cron/"
> guestfsd: <= is_dir (0x26) request length 64 bytes
> chroot: /sysroot: running 'is_dir: /var/spool/cron/'
> libguestfs: trace: is_dir = 1
> libguestfs: trace: find "/var/spool/cron/"
> libguestfs: trace: find0 "/var/spool/cron/" "/tmp/libguestfsiFoKQK/find641.txt"
> guestfsd: => is_dir (0x26) took 0.00 secs
> guestfsd: <= find0 (0xc4) request length 60 bytes
> find /sysroot/var/spool/cron/ -print0
> guestfsd: error: find /sysroot/var/spool/cron/ -print0: Cannot allocate memory
> guestfsd: => find0 (0xc4) took 0.00 secs
> libguestfs: trace: find0 = -1 (error)
> libguestfs: trace: find = NULL (error)

I have increased LIBGUESFS_MEMSIZE (aka --memsize for guestfish) from 500 to
4000, and still the same error occurs, so it does not seem to be caused by VM
memory size.

If I deactivate the "cron-spool" action, the failure occurs in another "find0"
invocation:

> [  10,6] Performing "package-manager-cache" ...
> ...
> libguestfs: trace: find0 "/var/cache/zypp/" "/tmp/libguestfsi4Phc/find641.txt"
guestfsd: => is_dir (0x26) took 0.00 secs
> guestfsd: <= find0 (0xc4) request length 60 bytes
> find /sysroot/var/cache/zypp/ -print0
> guestfsd: error: find /sysroot/var/cache/zypp/ -print0: Cannot allocate memory
> guestfsd: => find0 (0xc4) took 0.00 secs

If I remove the "package-manager-cache" action, too, the command succeeds.