linux-kernel - Re: [GIT PULL] pipe: Notification queue preparation

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Message-ID: <CAHk-=wgwwJ+ZEtycujFdNmpS8TjwCYyT+oHfV7d-GekyaX91xg@mail.gmail.com>
Date:   Thu, 5 Dec 2019 09:12:42 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     David Sterba <dsterba@...e.cz>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>, raven@...maw.net,
        Christian Brauner <christian@...uner.io>,
        keyrings@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-block <linux-block@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] pipe: Notification queue preparation

On Thu, Dec 5, 2019 at 5:57 AM David Howells <dhowells@...hat.com> wrote:
>
> David Sterba <dsterba@...e.cz> wrote:
>
> > [<0>] pipe_write+0x1be/0x4b0
>
> Can you get me a line number of that?  Assuming you've built with -g, load
> vmlinux into gdb and do "i li pipe_write+0x1be".

If the kernel is built with debug info (which you need for the gdb
command anyway), it's much better to just use

   ./scripts/decode_stacktrace.sh

which gives all the information for the whole backtrace.

It would be interesting to hear if somebody else is waiting on the
read side too.

             Linus