Hi,
The ptrace misses clearing the syscall trace flag.
The increased syscall overhead is retained after the trace is finished.
This case happens when strace is terminated by force.
Thanks,
Akiyama
Signed-off-by: Akiyama, Nobuyuki <[EMAIL PROTECTED]>
---
diff -Nurp linux-2.6.21-rc1.orig/arch/ia64/kernel/ptrace.c
linux-2.6.21-rc1.mod/arch/ia64/kernel/ptrace.c
--- linux-2.6.21-rc1.orig/arch/ia64/kernel/ptrace.c 2007-02-22
17:15:38.000000000 +0900
+++ linux-2.6.21-rc1.mod/arch/ia64/kernel/ptrace.c 2007-02-22
22:12:50.000000000 +0900
@@ -1573,6 +1573,7 @@ sys_ptrace (long request, pid_t pid, uns
case PTRACE_DETACH:
/* detach a process that was attached. */
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
ret = ptrace_detach(child, data);
goto out_tsk;
-
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