[Bug gdb/18368] New: gdb with nsenter attaches to wrong process

["raghu.prabhu13 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18368

            Bug ID: 18368
           Summary: gdb with nsenter attaches to wrong process
           Product: gdb
           Version: 7.9
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: raghu.prabhu13 at gmail dot com
  Target Milestone: ---

When trying to attach to a process in a different PID namespace, gdb correctly
identifies it and warns as "warning: Target and debugger are in different PID
namespaces; thread lists and other data are likely unreliable"

however, when used with nsenter (-p for pid namespace), it attaches to the
wrong process.


nsenter  -t 600  -p gdb -p 1      (where 600 is the PID of docker daemon, and 1
is the PID of process inside it, whose host pid is 29120).

GNU gdb (GDB) 7.9
.......
......
Attaching to process 1
Reading symbols from /usr/lib/systemd/systemd...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libcap.so.2...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libpam.so.0...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libkmod.so.2...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libmount.so.1...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libseccomp.so.2...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/librt.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libpthread.so.0...(no debugging symbols
found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Reading symbols from /usr/lib/libc.so.6...(no debugging symbols found)...done.
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libattr.so.1...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libdl.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/liblzma.so.5...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/libblkid.so.1...(no debugging symbols
found)...done.
Reading symbols from /usr/lib/libuuid.so.1...(no debugging symbols
found)...done.
0x00007f1439c951d3 in __epoll_wait_nocancel () from /usr/lib/libc.so.6
(gdb) quit
....

As you can see it attaches to systemd of the host than the process inside the
container.

nsenter  -t 600  -p gdb -p 29120 also gives the PID namespace warning and
doesn't work.

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