https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260667
Bug ID: 260667
Summary: [vtnet] net driver leaks when detached
Product: Base System
Version: 13.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Overview
--------
'if_vtnet' driver is missing the 'pfil_head_unregister()' during
'vtnet_detach()'.
Included a patch, which assumes the fix for bug #256714 is also applied.
Steps to Reproduce
------------------
Attach and then detach vnet device.
# vmstat -m | grep pfil
pfil 6 1K 5 128
# devctl attach pci0:0:4:0
virtio_pci1: <VirtIO PCI (legacy) Network adapter> port 0xc020-0xc03f mem
0xfeb92000-0xfeb92fff,0xfe004000-0xfe007fff irq 11 at device 4.0 on pci0
vtnet1: <VirtIO Networking Adapter> on virtio_pci1
pfil: duplicate head "vtnet1"
810.828154 [ 450] vtnet_netmap_attach vtnet attached txq=1, txd=256
rxq=1, rxd=128
# devctl detach pci0:0:4:0
# vmstat -m | grep pfil
pfil 7 1K 6 128
Actual Results
--------------
Leaks 'pfil' memory at each detach.
Expected Results
----------------
All memory allocated in attach is freed in the detach.
Build Date & Hardware
---------------------
root@freebsd:~ # uname -a
FreeBSD freebsd 13.0-RELEASE FreeBSD 13.0-RELEASE #0
releng/13.0-n244733-ea31abc261f: Fri Apr 9 04:24:09 UTC 2021
[email protected]:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64
Additional Information
----------------------
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