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Re: [Qemu-devel] [PATCH 0/2] memory: Fix up coalesced_io_del not working
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From: |
Peter Xu |
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Subject: |
Re: [Qemu-devel] [PATCH 0/2] memory: Fix up coalesced_io_del not working for KVM |
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Date: |
Mon, 19 Aug 2019 17:32:42 +0800 |
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User-agent: |
Mutt/1.11.4 (2019-03-13) |
On Sat, Aug 17, 2019 at 05:32:35PM +0800, Peter Xu wrote:
> I can easily crash QEMU as long as KVM is used with e1000 and reboot
> many times, then I hit this and QEMU aborts [1]:
>
> kvm_mem_ioeventfd_add: error adding ioeventfd: No space left on device (28)
Reproducer:
bin=x86_64-softmmu/qemu-system-x86_64
$bin -M q35,accel=kvm,kernel-irqchip=on -smp 8 -m 2G -cpu host \
-device e1000,netdev=net0 \
-netdev user,id=net0,hostfwd=tcp::5555-:22 \
-device e1000,netdev=net1 \
-netdev user,id=net1 \
-device e1000,netdev=net2 \
-netdev user,id=net2 \
-device e1000,netdev=net3 \
-netdev user,id=net3 \
-drive file=/images/default.qcow2,if=none,cache=none,id=drive0 \
-device virtio-blk-pci,drive=drive0
This should crash for no more than 2-3 reboots. The more e1000, the
faster.
Regards,
--
Peter Xu