Package: gdb Version: 8.2.1-2 Severity: normal Hi, When attaching to a process which resides in another mount-namespace, warnings are printed and while debugging symbols are not resolved. Besides that it seems to work though. The messages are:
(gdb) attach 26303 Attaching to process 26303 warning: "target:/bin/bash": could not open as an executable file: Operation not permitted. warning: `target:/bin/bash': can't open to read symbols: Operation not permitted. warning: Could not load vsyscall page because no executable was specified 0x00007ff1f2368681 in ?? () Steps to reproduce: In Terminal 1: $ sudo unshare -m $ su $YOUR_USER # running as your user should allow gdb attach $ echo $$ # -> note the PID In Terminal 2: $ gdb attach $PID Tested with gdb versions 7.12-6 and 8.2.1-2. On CentOS with gdb 7.6.1 the problem does *not* occur, so I suspect there is a debian-specific security-policy active, which causes that behaviour. Thanks Tycho -- System Information: Debian Release: 9.11 APT prefers oldstable-updates APT policy: (500, 'oldstable-updates'), (500, 'oldstable-debug'), (500, 'oldstable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.9.0-11-amd64 (SMP w/4 CPU cores) Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=de_DE.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages gdb depends on: ii libbabeltrace-ctf1 1.5.1-1 ii libbabeltrace1 1.5.1-1 ii libc6 2.24-11+deb9u4 ii libexpat1 2.2.0-2+deb9u2 ii libipt1 1.5-1 ii liblzma5 5.2.2-1.2+b1 ii libncurses5 6.0+20161126-1+deb9u2 ii libpython3.5 3.5.3-1+deb9u1 ii libreadline7 7.0-3 ii libtinfo5 6.0+20161126-1+deb9u2 ii zlib1g 1:1.2.8.dfsg-5 Versions of packages gdb recommends: ii libc6-dbg [libc-dbg] 2.24-11+deb9u4 Versions of packages gdb suggests: pn gdb-doc <none> pn gdbserver <none> -- no debconf information
