Hi Liam, On Mon, Nov 18, 2024 at 3:49 AM 'Liam R. Howlett' via syzkaller-bugs <syzkaller-bugs@xxxxxxxxxxxxxxxx> wrote: > > * syzbot <syzbot+bc6bfc25a68b7a020ee1@xxxxxxxxxxxxxxxxxxxxxxxxx> [241117 05:42]: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 8e9a54d7181b Merge remote-tracking branch 'iommu/arm/smmu'.. > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > > console output: https://syzkaller.appspot.com/x/log.txt?x=17b0ace8580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=a1eb85a42cb8ccec > > dashboard link: https://syzkaller.appspot.com/bug?extid=bc6bfc25a68b7a020ee1 > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > userspace arch: arm64 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=147521a7980000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102e14c0580000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/ad658fb4d0a2/disk-8e9a54d7.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/1b7754fa8c67/vmlinux-8e9a54d7.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/50315382fefb/Image-8e9a54d7.gz.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+bc6bfc25a68b7a020ee1@xxxxxxxxxxxxxxxxxxxxxxxxx > > I was unable to get this reproducer to work on my own image, even using > the config and compiler specified in the report. The injection was not > happening at the same location as the crash reports. > > After using the provided disk (which was tricky), I was able to get it > to work. Just in case: did you follow the official syzbot instructions on reproducing the bugs from the attached assets? [1] If yes, what extra information could have made the process simpler for you? [1] https://github.com/google/syzkaller/blob/master/docs/syzbot_assets.md > Booting was painfully slow, and makes me wonder if there is a > better way for reproducing issues in the future. I guess that unless you run it on an arm64 device with a nested virtualization support, this bug's reproduction will be slow anyway :( If you recompile the kernel image without CONFIG_KASAN and CONFIG_KCOV, that should speed it up to some degree. > > I've been debating just abusing the bot to debug, but it will spam the > entire list, but I have it reproducing now. Syzbot only makes sure that linux-kernel@xxxxxxxxxxxxxxx and syzkaller-bugs@xxxxxxxxxxxxxxxx are included, both are not really assumed to be closely followed by human beings. So I think it should be totally fine to debug with syzbot if you just Cc those two lists. -- Aleksandr > > Thanks, > Liam >
