Re: [Bug 1924912] VirtIO drivers don't work on Windows: "GLib: Too many handles to wait for!" crash

[Laurent Vivier]

Le 19/04/2021 à 12:39, Stefan Weil a écrit :
> I can confirm the issue also with latest official QEMU sources.
> 
> Related issue URLs:
> 
> https://github.com/tesseract-ocr/tesseract/issues/2838
> 
> https://bugs.launchpad.net/qemu/+bug/1924912
> 
> Instructions and files required to reproduce the issue:
> 
> https://qemu.weilnetz.de/test/bugs/1924912/
> 
> Michael, Laurent, maybe you have an idea how to narrow down this issue?

Could it be related to the number of file descriptors that can differ between 
linux an windows?

We have a series of patches that sets the number of queues to the number of 
vCPU:

a4eef0711b2c vhost-user-blk-pci: default num_queues to -smp N
9445e1e15e66 virtio-blk-pci: default num_queues to -smp N
6a558822849f virtio-scsi-pci: default num_queues to -smp N
4e5163bd8444 virtio-scsi: introduce a constant for fixed virtqueues
1436f32a84c3 virtio-pci: add virtio_pci_optimal_num_queues() helper

And I think it can have inpact on the number of open file descriptors.

You can try by specifiying "num_queues=1" with the virtio interfaces on the 
QEMU command line.
(ot choose a machine type earlier than 5.2)

Thanks,
Laurent