On Thu, Mar 18, 2021 at 08:34:16PM +0100, Dmitry Vyukov wrote:
> On Thu, Mar 18, 2021 at 8:31 PM syzbot
> <[email protected]> wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: bf152b0b Merge tag 'for_linus' of git://git.kernel.org/pub..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17d5264ed00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=2c9917c41f0bc04b
> > dashboard link: https://syzkaller.appspot.com/bug?extid=0b036374a865ba0efa8e
> > userspace arch: arm64
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: [email protected]
> >
> > watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.1:3684]
>
> +Will, arm
>
> If I am reading this commit correctly, this is caused by:
>
> commit cae118b6acc309539b33339e846cbb19187c164c
> Author: Will Deacon
> Date: Wed Mar 3 13:49:27 2021 +0000
> arm64: Drop support for CMDLINE_EXTEND
>
> syzbot passes lots of critical things in CONFIG_CMDLINE:
> https://github.com/google/syzkaller/blob/c3c81c94865791469d376eba84f4a2d7763d3f71/dashboard/config/linux/upstream-arm64-kasan.config#L495
> but also wants the bootloader args to be appended.
> What is the way to do it now?
For now, there isn't a way to do it with CONFIG_CMDLINE, so I think you can
either:
* Revert my patch for your kernels
* Pass the arguments via QEMU's -append option
* Take a look at one of the series which should hopefully add this
functionality back (but with well-defined semantics) [1] [2]
Sorry for the nuisance; I did try to fix this [3] but it's a bit of a
mess.
Will
[1]
https://lore.kernel.org/linux-arch/[email protected]/
[2]
https://lore.kernel.org/linux-mips/[email protected]/#t
[3] https://lore.kernel.org/r/[email protected]
