linux-kernel - Re: [syzbot] [kernel?] possible deadlock in __hrtimer_run

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Message-ID: <ZGCEImqSjsYIlLgJ@shredder>
Date:   Sun, 14 May 2023 09:48:02 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     syzbot <syzbot+3384541342de0ca933f1@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [syzbot] [kernel?] possible deadlock in __hrtimer_run_queues

On Sat, May 13, 2023 at 09:34:12PM +0200, Thomas Gleixner wrote:
> On Sat, May 13 2023 at 12:37, Ido Schimmel wrote:
> > Thomas, I applied the fix on top of net-next (which includes
> > 0af462f19e63). I'm getting the splat below during boot and then the
> > systems hangs.
> 
> Because I'm a moron. I got the same splat while testing, fixed it on the
> test machine and then did not sync it back before sending...
> 
> Updated fix which also replaces GFP_ATOMIC with __GFP_HIGH to prevent
> the allocator to wake up the swap daemons, which causes yet another lock
> inversion issue.

Looks good now. Feel free to add:

Tested-by: Ido Schimmel <idosch@...dia.com>

Thanks a lot!