Messages in this thread | | | From | Aleksandr Nogikh <> | Date | Thu, 5 Jan 2023 12:14:17 +0100 | Subject | Re: [syzbot] [erofs?] WARNING: CPU: NUM PID: NUM at mm/page_alloc.c:LINE get_page_from_freeli |
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Hi,
On Thu, Jan 5, 2023 at 11:54 AM Xiang Gao <hsiangkao@linux.alibaba.com> wrote:
> I wasn't able to build the kernel with this kernel config, it shows: > "... > FATAL: modpost: vmlinux.o is truncated. sechdrs[i].sh_offset=1399394064 > sizeof(*hrd)=64 > make[2]: *** [Module.symvers] Error 1 > make[1]: *** [modpost] Error 2 > make: *** [__sub-make] Error 2 > "
Could you please tell, what exact compiler/linker version did you use?
> > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/0c8a5f06ceb3/disk-f9ff5644.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/be222e852ae2/vmlinux-f9ff5644.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/d9f42a53b05e/bzImage-f9ff5644.xz > > Finally I tried the original kernel image, and it printed some other > random bug when booting system and then reboot, like: > > [ 36.991123][ T1] ================================================================== > [ 36.991800][ T1] BUG: KASAN: slab-out-of-bounds in copy_array+0x96/0x100 > [ 36.992438][ T1] Write of size 32 at addr ffff888018c34640 by task systemd/1 < .. >
Interesting! I've just tried to boot it with qemu and it was fine.
qemu-system-x86_64 -smp 2,sockets=2,cores=1 -m 4G -drive file=disk-f9ff5644.raw,format=raw -snapshot -nographic -enable-kvm
So it looks like it's some difference between these VMMs that causes that bug to fire.
> > May I ask it can be reproducable on the latest -rc kernel?
We can ask syzbot about v6.2-rc2:
#syz test git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git 88603b6dc419445847923fcb7fe5080067a30f98
> > Thanks, > Gao Xiang >
-- Aleksandr
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