Re: [syzbot] riscv/fixes boot error: can't ssh into the instance (2)

[Alexandre Ghiti]

On 02/06/2023 09:58, Alexandre Ghiti wrote:
> On 01/06/2023 18:04, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    8dc2a7e8027f riscv: Fix relocatable kernels with 
> > early alt..
> > git tree: 
> > git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17e9fbcd280000
> > kernel config: 
> > https://syzkaller.appspot.com/x/.config?x=6b4bf01bbb07f945
> > dashboard link: 
> > https://syzkaller.appspot.com/bug?extid=a74d57bddabbedd75135
> > compiler:       riscv64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 
> > 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > userspace arch: riscv64
> >
> > Downloadable assets:
> > disk image (non-bootable): 
> > https://storage.googleapis.com/syzbot-assets/a741b348759c/non_bootable_disk-8dc2a7e8.raw.xz
> > vmlinux: 
> > https://storage.googleapis.com/syzbot-assets/822e3cbe29ad/vmlinux-8dc2a7e8.xz
> > kernel image: 
> > https://storage.googleapis.com/syzbot-assets/7bda24abf1c2/Image-8dc2a7e8.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the 
> > commit:
> > Reported-by: syzbot+a74d57bddabbedd75135@xxxxxxxxxxxxxxxxxxxxxxxxx
> >
> >
> >
> > ---
> > This report is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
> >
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
> > If the bug is already fixed, let syzbot know by replying with:
> > #syz fix: exact-commit-title
> >
> > If you want to change bug's subsystems, reply with:
> > #syz set subsystems: new-subsystem
> > (See the list of subsystem names on the web dashboard)
> >
> > If the bug is a duplicate of another bug, reply with:
> > #syz dup: exact-subject-of-another-report
> >
> > If you want to undo deduplication, reply with:
> > #syz undup
> >
> > _______________________________________________
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> > linux-riscv@xxxxxxxxxxxxxxxxxxx
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>
>
> I'm looking into those failures.


So KFENCE was broken by commit 3335068f8721 ("riscv: Use PUD/P4D/PGD 
pages for the linear mapping") since our kfence implementation only 
breaks pmd hugepages. Let me fix that for 6.4.


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