Re: BUG: divide error in ubi_attach_mtd_dev

[Richard Weinberger]

Yu Hao,

----- Ursprüngliche Mail -----
> Von: "Yu Hao" <yhao016@xxxxxxx>
>> ubi: mtd0 is already attached to ubi0
>> ubi7: attaching mtd147
>> divide error: 0000 [#1] PREEMPT SMP KASAN
>> CPU: 0 PID: 20023 Comm: syz-executor.0 Not tainted 6.2.0 #6
>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
>> 1.13.0-1ubuntu1.1 04/01/2014
>> RIP: 0010:mtd_div_by_eb include/linux/mtd/mtd.h:580 [inline]
>> RIP: 0010:io_init drivers/mtd/ubi/build.c:620 [inline]
>> RIP: 0010:ubi_attach_mtd_dev+0x77f/0x2fe0 drivers/mtd/ubi/build.c:955
>> Code: fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38
>> d0 7c 08 84 d2 0f 85 1f 25 00 00 41 8b 4c 24 10 48 89 d8 31 d2 <48> f7
>> f1 48 89 c3 e8 b6 f3 1b fc 48 8d 85 40 17 00 00 48 89 c2 48
>> RSP: 0018:ffffc9000be0fd30 EFLAGS: 00010246
>> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
>> RDX: 0000000000000000 RSI: ffff888047a49d40 RDI: 0000000000000002
>> RBP: ffff888024e1c000 R08: 0000000000000016 R09: fffff520017c1f47
>> R10: ffffc9000be0fa37 R11: fffff520017c1f46 R12: ffff88806545a000
>> R13: 0000000000000000 R14: ffff88806545a010 R15: 0000000000000007
>> FS:  00007fd45e85c700(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00007f64aeef53a4 CR3: 000000004f39a000 CR4: 0000000000350ef0
>> Call Trace:
>>  <TASK>
>>  ctrl_cdev_ioctl+0x303/0x3a0 drivers/mtd/ubi/cdev.c:1043

What kind of MTD you attaching?
Has it erasesize 0?

Thanks,
//richard