On 01/05, Oleg Nesterov wrote: > > I'll add clear_bit(TIF_SINGLE_STEP) into do_fork() path and re-test.
Hmm. This patch --- kernel/fork.c~ 2009-12-22 10:41:53.188084961 -0500 +++ kernel/fork.c 2010-01-05 11:42:58.370636323 -0500 @@ -1206,6 +1206,8 @@ static struct task_struct *copy_process( * of CLONE_PTRACE. */ clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE); + clear_tsk_thread_flag(p, TIF_SINGLE_STEP); + user_disable_single_step(p); #ifdef TIF_SYSCALL_EMU clear_tsk_thread_flag(p, TIF_SYSCALL_EMU); #endif doesn't help, I still see the same XXX's in dmesg... Oleg.