[lkml]   [2020]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCHv2] exec: Fix a deadlock in ptrace
On 03/01, Bernd Edlinger wrote:
> This fixes a deadlock in the tracer when tracing a multi-threaded
> application that calls execve while more than one thread are running.

Heh. Yes, known problem. See my attempt to fix it:

> @@ -1224,7 +1224,7 @@ struct mm_struct *mm_access(struct task_struct *task, unsigned int mode)
> struct mm_struct *mm;
> int err;
> - err = mutex_lock_killable(&task->signal->cred_guard_mutex);
> + err = mutex_lock_killable(&task->signal->cred_change_mutex);

So if I understand correctly your patch doesn't fix other problems
with debugger waiting for cred_guard_mutex.

I too do not think this can justify the new mutex in signal_struct...


 \ /
  Last update: 2020-03-02 13:29    [W:0.296 / U:0.752 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site