[Valgrind-users] exp-ptrcheck: unhandled syscall (sysno == 290)

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Hi,
	I'm trying to debug an app on Ubuntu 10.10 x86_64.  When I open it in exp-ptrcheck, I get the following error:

sysno == 290
exp-ptrcheck: the 'impossible' happened:
  unhandled syscall
==8235==    at 0x3801303F: report_and_quit (m_libcassert.c:191)
==8235==    by 0x38013138: panic (m_libcassert.c:275)
==8235==    by 0x38013157: vgPlain_tool_panic (m_libcassert.c:290)
==8235==    by 0x38002B83: h_post_syscall (h_main.c:2588)
==8235==    by 0x380509C9: vgPlain_post_syscall (syswrap-main.c:1728)
==8235==    by 0x38051A4D: vgPlain_client_syscall (syswrap-main.c:1626)
==8235==    by 0x3804DED2: handle_syscall (scheduler.c:885)
==8235==    by 0x3804F66A: vgPlain_scheduler (scheduler.c:1081)
==8235==    by 0x380791A0: run_a_thread_NORETURN (syswrap-linux.c:94)


	As far as I can tell from Web searches, this means that support simply doesn't exist for this particular syscall?  Is there anything I can do about it, or do I just have to work around it?

Thanks,
Adam