linux-kernel - Re: BUG: divide error in ubi_attach_mtd

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Date:   Thu, 20 Apr 2023 22:36:55 +0200 (CEST)
From:   Richard Weinberger <richard@....at>
To:     Yu Hao <yhao016@....edu>
Cc:     chengzhihao1 <chengzhihao1@...wei.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: BUG: divide error in ubi_attach_mtd_dev

----- Ursprüngliche Mail -----
>> Can you please share the qemu command line?
> qemu-system-x86_64 -m 2G -smp 2 -kernel
> /home/test/Workspace/SyzGen/linux-distro/linux-6.2-debug/arch/x86/boot/bzImage
> -append “console=ttyS0 root=/dev/sda net.ifnames=0” -hda
> /home/test/Workspace/SyzGen/linux-distro/image/stretch.img -chardev
> socket,id=SOCKSYZ,server=on,nowait,host=localhost,port=54640 -mon
> chardev=SOCKSYZ,mode=control -device virtio-rng-pci -device
> e1000,netdev=net0 -netdev
> user,id=net0,restrict=on,hostfwd=tcp:127.0.0.1:11760-:22 -display none
> -serial stdio -cpu host,migratable=off -no-reboot -name VM -snapshot
> -enable-kvm
> 
>> Within Linux you can query /proc/mtd or /sys/class/mtd/
>> to get infos about the MTD in question.
>>
> 
> Thanks for the hints. We find that this is a “mtdram test device”.
> 
> root@...kaller:~# cat /proc/mtd
> dev:    size   erasesize  name
> mtd0: 00020000 00001000 “mtdram test device”

Hmm, mtdram should be fine, erasesize is not zero.

Thanks,
//richard