https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231166
Bug ID: 231166
Summary: 11.1->11.2 Update brings em network link state
flapping
Product: Base System
Version: 11.2-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: steven_nik...@ertyu.org
Immediately after doing an upgrade from 11.1-release to 11.2-release the
network connection using em0 constantly goes up and down. It's driving an Intel
82574 card on PCI-E. I've tried rebooting, power cycling, using different
cables, switch ports and a different switch with no change. Prior everything
was stable for many moons in the same configuration. Switched to using the
onboard Realtek in the system and that is also stable with the same
cable/switch.
Sep 4 20:37:20 itsirk kernel: em0: link state changed to UP
Sep 4 20:37:20 itsirk kernel: em0: link state changed to DOWN
Sep 4 20:37:27 itsirk kernel: em0: link state changed to UP
Sep 4 20:37:27 itsirk kernel: em0: link state changed to DOWN
Sep 4 20:37:31 itsirk kernel: em0: link state changed to UP
Sep 4 20:37:31 itsirk kernel: em0: link state changed to DOWN
em0: <Intel(R) PRO/1000 Network Connection 7.6.1-k> port 0xdf00-0xdf1f mem
0xfdcc0000-0xfdcdffff,0xfdc00000-0xfdc7ffff,0xfdcfc000-0xfdcfffff irq 19 at
device 0.0 on pci2
em0: Using MSIX interrupts with 3 vectors
em0: Ethernet address: 00:1b:21:39:dc:5f
em0: netmap queues/slots: TX 1/1024, RX 1/1024
em0@pci0:3:0:0: class=0x020000 card=0xa01f8086 chip=0x10d38086 rev=0x00
hdr=0x00
vendor = 'Intel Corporation'
device = '82574L Gigabit Network Connection'
class = network
subclass = ethernet
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit
cap 10[e0] = PCI-Express 1 endpoint max data 128(256) RO NS
link x1(x1) speed 2.5(2.5) ASPM disabled(L0s/L1)
cap 11[a0] = MSI-X supports 5 messages, enabled
Table in map 0x1c[0x0], PBA in map 0x1c[0x2000]
ecap 0001[100] = AER 1 0 fatal 0 non-fatal 0 corrected
ecap 0003[140] = Serial 1 001b21ffff39dc5f
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