Re: qemu-system-m68k: ../hw/scsi/scsi-disk.c:557: scsi_write_data: Assertion `r->req.aiocb == NULL' failed.

[Mark Cave-Ayland]

On 16/08/2023 12:30, Waldemar Brodkorb wrote:

> Hi,
> Philippe Mathieu-Daudé wrote,
>
> > Hi Waldemar
> >
> > On 13/8/23 09:46, Waldemar Brodkorb wrote:
> > > Hi,
> > >
> > > I am using Qemu 8.0.3 and getting this error:
> > > qemu-system-m68k: ../hw/scsi/scsi-disk.c:557: scsi_write_data: Assertion 
> > > `r->req.aiocb == NULL' failed.
> > >
> > > It happens f.e. when I extract the glibc source code inside Linux.
> > > Linux 6.1.44, glibc 2.38 is used for the Linux system.
> > > I am starting qemu this way:
> > > qemu-system-m68k -nographic -M q800 -kernel 
> > > /home/wbx/openadk/firmware/qemu-m68k-q800_glibc_68040/qemu-m68k-q800-archive-kernel
> > >  qemu-m68k.img
> > >
> > > What can I do about it? Why this is happening on "heavy" I/O usage?
> >
> > Cc'ing the qemu-block list.
> >
> > Do you mind filling a bug report at
> > https://gitlab.com/qemu-project/qemu/-/issues ?
>
> Okay, see here:
> https://gitlab.com/qemu-project/qemu/-/issues/1831

Thanks for the bug report! I'm currently working on improving the ESP emulation, so I 
can add your test case to my current suite of test images. My guess is that the write 
interrupt isn't being delayed correctly and so the assert() triggers due to buffer 
underflow.

Please can you upload the binary images to the bug report to allow me to try and 
reproduce this issue? The ESP code tends to be timing sensitive across kernel 
versions and OSs, so without this it will be difficult to reproduce.


ATB,

Mark.