Re: bad config syzkaller param: can't find /syzkaller/jobs-2/netbsd/gopath/src/github.com/google/syzkaller/bin/netbsd_amd64/syz-executor

["'Aleksandr Nogikh' via syzkaller-netbsd-bugs" <syzkaller-netbsd-bugs%googlegroups.com@localhost>]

On Wed, Apr 19, 2023 at 9:47 PM Taylor R Campbell <riastradh%netbsd.org@localhost> wrote:
>
> > Date: Wed, 19 Apr 2023 14:37:23 +0200
> > From: Aleksandr Nogikh <nogikh%google.com@localhost>
> >
> > On Wed, Apr 19, 2023 at 10:11 AM Taylor R Campbell <riastradh%netbsd.org@localhost> wrote:
> > >
> > > Looks like syzkaller is having trouble running NetBSD jobs again?
> > >
> > > https://syzkaller.appspot.com/text?tag=Error&x=17eb5d3fc80000
> >
> > Thank you for reporting!
> > Indeed, there seem to be some problems. I've looked into that for some
> > time and filed https://github.com/google/syzkaller/issues/3819. I'll
> > let you know when it's fixed.
>
> Great, thanks!

I've fixed the problem, so patch testing should be working fine now.

>
> > It's interesting that there are many "pmap_unwire: wiring for pmap
> > <...> did not change!"-like messages in logs for both bugs [1] [2].
> > What does it mean?
> >
> > [1] https://syzkaller.appspot.com/text?tag=CrashLog&x=1455193fc80000
> > [2] https://syzkaller.appspot.com/text?tag=CrashLog&x=15e5f9b7c80000
>
> Both logs have this line in it, followed by opening and writing to
> this file:
>
> compat_50_mknod(&(0x7f0000000000)='./file0\x00', 0x2001, 0x400)
>
> As Chuck explained, this creates a device node mapping the swap space;
> if any swap files or devices are configured, writing to this device
> node would likely corrupt userland process memory and/or crash
> processes.  So I think both of these crash logs are red herrings.

Thanks for the details!
I've sent a PR that enables call sanitization for compat_50_mknod:
https://github.com/google/syzkaller/pull/3826

Could you please confirm that
compat_50_mknod(&(0x7f0000000000)='./file0\x00', 0x2001, 0x400)
->
compat_50_mknod(&(0x7f0000000000)='./file0\x00', 0x8001, 0x400)
is a reasonable replacement?

--
Aleksandr

>
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