On Thu, Jul 13, 2006 at 11:24:40AM -0700, Jay Lan wrote: > >We ran into a system hang problem at sys_ptrace. > > > >The system may hang if a user attempts to "strace" a pthreaded > >application that is making frequent calls to pthread_create & > >pthread_exit. > >The hang is caused by a task sleeping (yield()) while holding the > >tasklist_lock. > > > >Note that the problem appears to exist ONLY on IA64. IA64 has an > >ARCH-specific implementation of sys_ptrace(). And David's patch to get rid of this ia64-special would fix this aswell: http://marc.theaimsgroup.com/?l=linux-kernel&m=111575781225495&w=2 Note that this patch would need some updates for merging these days: - make ptrace_attach_sync_user_rbs and architecture hook aswell, so that ia64 can use the generic ptrace code - kmalloc return value needs checking - adjust coding style to match the normal linux style now that arch/ia64/ adheres to it. - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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