gdb cannot attach to process

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Here is the OS I am using:

Linux securecluster 4.9.8-moby #1 SMP Wed Feb 8 09:56:43 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

When trying to attach gdb to hanging process as root user, I got the following:

Attaching to process 9636
Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.

I modified /etc/sysctl.d/10-ptrace.conf , resulting in:

kernel.yama.ptrace_scope = 0

However, I got the same error. I tried changing /proc/sys/kernel/yama/ptrace_scope :

echo 0 | tee /proc/sys/kernel/yama/ptrace_scope
tee: /proc/sys/kernel/yama/ptrace_scope: Read-only file system

Hint is appreciated.

ptrace docker gdb linux
3 Answers

@Ted @escapecharacter The kernel parameters you are referring to are taken from the host system that is why it is read-only, you cannot edit the actual config file from inside the container. you can override it in the container, just drop the -w flag to #sudo sysctl kernel.yama.ptrace_scope=0 . A permanent solution is to do this on the host node and all containers would inherit this by default.

user_93597230
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