Date: Sun, 28 Jan 2018 14:21:00 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 225506] Reading from virtio-blk device hangs Message-ID: <bug-225506-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D225506 Bug ID: 225506 Summary: Reading from virtio-blk device hangs Product: Base System Version: 11.1-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: kozlov.sergey.404@gmail.com I'm using FreeBSD on KVM virtual machine from a hosting provider. On both 11.1-RELEASE and 12.0-CURRENT (2018-01-18) reading /dev/vtbd0 device hangs.=20 Using CentOS 6.9 I'm able to read full /dev/vda device without a hang. - Command # dd if=3D/dev/vtbd0 of=3D/dev/null bs=3D1M will eventually hang. - top shows dd in physrd state. - gstat shows L(q) equal to 1 or 2 (depending on a try), all the IOPS and throughput indications are zero for /dev/vtbd0 - dd can't be terminated with SIGKILL - the only way to terminate the dd process is # devctl disable vtbd0 Server configuration: RAM: 512MB CPU: 1x Intel Xeon E5-2620 v3 @ 2.40 GHz Disk: 250GB virtio-blk <Additional info will be attached in a separate files> The info from the hosting provider: We are running the latest QEMU version and the latest 3.1 branch kernel, wh= ich was released for fixing the Spectre and Meltdown vulnerabilities. I'm still paying for the server, but I want to leave it in this state for n= ow to help investigate the issue. --=20 You are receiving this mail because: You are the assignee for the bug.=
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