https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253708

--- Comment #1 from Peter Eriksson <p...@lysator.liu.se> ---
I tried booting some various kernels on our test R730xd server. It’s currently
using a LACP lagg though and runnings FreeBSD 11.4 but is otherwise identical
to the (production) servers that are experiencing this. 


Result: Short story - problem seems to be with lagg as failover.


With lagg0 as LACP:

ifconfig_lagg0="laggproto lacp laggport ixl0 laggport ixl2 130.236.8.40 netmask
255.255.255.224 lacp_fast_timeout"                 
ifconfig_lagg0_ipv6="inet6 2001:6b0:17:2400::8:40/64 lacp_fast_timeout”  

Works fine:
- FreeBSD 13.0-STABLE #1 stable/13-d69677407: Sat Feb 20 19:43:06 CET 2021
- FreeBSD 12.2-STABLE stable/12-n1-d666638e2 GENERIC amd64
- FreeBSD 12.2-RELEASE-p3 #41 r369323M: Sat Feb 20 21:06:13 CET 2021
- FreeBSD 11.4-RELEASE-p7 #0: Wed Jan 27 16:09:57 UTC 2021


With lagg0 as Failover:

ifconfig_lagg0="laggproto failover laggport ixl0 laggport ixl2 130.236.8.40
netmask 255.255.255.224 -use_flowid"
ifconfig_lagg0_ipv6="inet6 2001:6b0:17:2400::8:40/64 -use_flowid"

Hangs on boot:
- FreeBSD 12.2-RELEASE-p3 #41 r369323M: Sat Feb 20 21:06:13 CET 2021

Works:
- FreeBSD 13.0-STABLE #1 stable/13-d69677407: Sat Feb 20 19:43:06 CET 2021
- FreeBSD 12.2-STABLE stable/12-n1-d666638e2 GENERIC amd64
- FreeBSD 11.4-RELEASE-p7 #0: Wed Jan 27 16:09:57 UTC 2021
- FreeBSD 11.3-RELEASE-p10 #0: Tue Jun  9 08:49:05 UTC 2020



ixl0: <Intel(R) Ethernet Controller X710 for 10GbE SFP+ - 2.3.0-k> mem
0xc9000000-0xc9ffffff,0xca008000-0xca00ffff at device 0.0 numa-domain 1 on
pci15
ixl0: fw 7.83.59945 api 1.9 nvm 7.10 etid 800075df oem 19.4864.12
ixl0: PF-ID[0]: VFs 64, MSI-X 129, VF MSI-X 5, QPs 768, I2C
ixl0: Using 1024 TX descriptors and 1024 RX descriptors
ixl0: Using 8 RX queues 8 TX queues
ixl0: Using MSI-X interrupts with 9 vectors
ixl0: Ethernet address: 3c:fd:fe:24:e7:e0
ixl0: Allocating 8 queues for PF LAN VSI; 8 queues active
ixl0: PCI Express Bus: Speed 8.0GT/s Width x8
ixl0: Failed to initialize SR-IOV (error=2)
ixl0: netmap queues/slots: TX 8/1024, RX 8/1024

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