From: bibo,mao Date: Tue, 30 Jan 2007 03:02:19 +0000 (+0800) Subject: [IA64] find thread for user rbs address X-Git-Tag: v2.6.21-rc2~42^2~16^2~17 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=87f76d3aafe5b5e0a1d6d857088a0263b35afa6b;p=~shefty%2Frdma-dev.git [IA64] find thread for user rbs address I encountered one problem when running ptrace test case the situation is this: traced process's syscall parameter needs to be accessed, but for sys_clone system call with clone_flag (CLONE_VFORK | CLONE_VM | SIGCHLD) parameter. This syscall's parameter accessing result is wrong. The reason is that vforked child process mm point is the same, but tgid is different. Without this patch find_thread_for_addr will return vforked process if vforked process is also stopped, but not the thread which calls vfork syscall. Signed-off-by: Tony Luck --- diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c index f1ec129ae3a..3f8918782e0 100644 --- a/arch/ia64/kernel/ptrace.c +++ b/arch/ia64/kernel/ptrace.c @@ -607,7 +607,7 @@ find_thread_for_addr (struct task_struct *child, unsigned long addr) */ list_for_each_safe(this, next, ¤t->children) { p = list_entry(this, struct task_struct, sibling); - if (p->mm != mm) + if (p->tgid != child->tgid) continue; if (thread_matches(p, addr)) { child = p;