https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243993
Bug ID: 243993
Summary: FreeBSD as Guest with 5+ with xnb(4) devices panic on
call to sysctl -a in strlen
Product: Base System
Version: 12.1-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 211484
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211484&action=edit
Interactive kgdb CLI with VIFs=7 and info, core.txt from savecore.
When running FreeBSD 12.1-stable r354267 amd64 as a guest under Xen 4.11
(XCP-ng 8.0), when adding 7 VIFs (xn NICs), a `sysctl -a ` panics the VM.
XEN: Hypervisor version 4.11 detected.
Hypervisor: Origin = "XenVMMXenVMM"
It's not totally clear to me why, but it appears that in
/usr/src/sys/libkern/strlen.c lines 99 and 100, in strlen(), that lp appears to
be zero.
Burt force testing show that four VIFs using xnb(4) are fine, adding the fifth
produces the panic.
Of note, I also have net.fibs=8, but haven't configured other fibs yet.
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