[Bug 253932] Freebsd 11.4 crashes on reboots on ESXi with passthrough of NIC

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253932

            Bug ID: 253932
           Summary: Freebsd 11.4 crashes on reboots on ESXi with
                    passthrough of NIC
           Product: Base System
           Version: 11.4-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mohdarif.khan at gmail.com

Hi All,

The FreeBSD 11.4 vanilla VM downloaded from freebsd.org is crashing when doing
passthrough of Intel NIC
"Ethernet Controller X710 for 10GbE SFP+" after a couple of reboots.

In the ESXi kernel logs seeing this message
Code:
cpu10:2235436)IntrCookie: 1565: Unable to allocate 128 cookies: Out of
resources
2021-02-24T13:32:47.831Z cpu10:2235436)PCIPassthru: 2461: Failed to allocate
128 MSIX interrupts"
2021-02-24T13:32:47.968Z cpu10:2235436)UserDump: 2630:
vmx-vcpu-1:arif-debug-11: Dumping cartel 2235424 (from world 2235436) to file
/vmfs/volumes/5e329ba9-50e9cd52-8a4b-0cc47aacfdbc/arif-new-11/vmx-zdump.000 ...
2021-02-24T13:32:48.771Z cpu1:2235436)UserDump: 2818: vmx-vcpu-1:arif-debug-11:
Userworld(vmx-vcpu-1:arif-debug-11) coredump complete.
PCIPassthru: 2461: Failed to allocate 128 MSIX interrupts


The issue is not seen 10.* freebsd VM. Looks like there is some issue with
pci_alloc and free functions. First of all why ESX allocating 128 interrupts
for one MSIX interrupt. And again after some reboots all the available
interrupts are exhausted.

regards,
mak

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