Messages in this thread | | | From | Peter Chubb <> | Date | Thu, 26 Feb 2004 17:27:04 +1100 | Subject | /proc visibility patch breaks GDB, etc. |
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In fs/proc/base.c:proc_pid_lookup(), the patch
read_unlock(&tasklist_lock); if (!task) goto out; + if (!thread_group_leader(task)) + goto out_drop_task; inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
means that threads other than the thread group leader don't appear in the /proc top-level directory. Programs that are informed via pid of events can no longer find the appropriate process -- for example, using gdb on a multi-threaded process, or profiling using perfmon.
The immediate symptom is GDB saying: Could not open /proc/757/status when 757 is a TID not a PID.
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