Mono hangs while running with qemu ARM user emulation (chroot)

Binary package hint: mono

While trying to install mono packages inside a qemu-arm-static chroot on a x86_64, with proc filesystem mounted inside the chroot, mono hangs and block the installation.

You can also reproduce it easily by calling mono directly, like:
# mount -t ext3 -o loop qemu-armel-bug.img /tmp/rootfs/
# mount -t proc proc /tmp/rootfs/proc/
# mount -t devpts devpts /tmp/rootfs/dev/pts/
# chroot /tmp/rootfs /usr/bin/mono /usr/lib/mono/2.0/gacutil.exe
qemu: Unsupported syscall: 242
qemu: Unsupported syscall: 242
Usage: gacutil.exe <commands> [ <options> ]
Commands:
-i <assembly_path> [-check_refs] [-package NAME] [-root ROOTDIR] [-gacdir GACDIR]
 Installs an assembly into the global assembly cache.

-il <assembly_list_file> [-check_refs] [-package NAME] [-root ROOTDIR] [-gacdir GACDIR]
 Installs one or more assemblies into the global assembly cache.

-u <assembly_display_name> [-package NAME] [-root ROOTDIR] [-gacdir GACDIR]
 Uninstalls an assembly from the global assembly cache.

-ul <assembly_list_file> [-package NAME] [-root ROOTDIR] [-gacdir GACDIR]
 Uninstalls one or more assemblies from the global assembly cache.

-us <assembly_path> [-package NAME] [-root ROOTDIR] [-gacdir GACDIR]
 Uninstalls an assembly using the specifed assemblies full name.

-l [assembly_name] [-root ROOTDIR] [-gacdir GACDIR]
 Lists the contents of the global assembly cache.

-?
 Displays a detailed help screen

<---------HANG

Tested with Maverick and with a Maverick ARM chroot.
Mono: 2.6.3-4ubuntu1
Qemu-kvm: 0.12.4+noroms-0ubuntu5