wm(4): failed to aquire semaphore

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello,
I have an older desktop system with:
wm0 at pci0 dev 25 function 0: 82801I (AMT) LAN Controller (rev. 0x02)
wm0: interrupting at msi0 vec 0
wm0: PCI-Express bus
wm0: 2048 words FLASH, version 1.1.1
wm0: Ethernet address 00:1a:a0:d5:a0:0d
wm0: 0x2a4480<FLASH,IOH_VALID,PCIE,ASF_FIRM,AMT,WOL>
igphy0 at wm0 phy 1: i82566 10/100/1000 media interface, rev. 0
igphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto

running netbsd 9.1.
Every 5mn, I see in dmesg:
[ 78053.063361] wm0: failed to acquire semaphore
[ 78053.073383] wm0: wm_gmii_i82544_readreg: failed to get semaphore
[ 78353.800448] wm0: failed to acquire semaphore
[ 78353.800448] wm0: wm_gmii_i82544_readreg: failed to get semaphore
[ 78654.537999] wm0: failed to acquire semaphore
[ 78654.537999] wm0: wm_gmii_i82544_readreg: failed to get semaphore
[ 78955.275254] wm0: failed to acquire semaphore
[ 78955.275254] wm0: wm_gmii_i82544_readreg: failed to get semaphore
[ 79256.013287] wm0: failed to acquire semaphore
[ 79256.013287] wm0: wm_gmii_i82544_readreg: failed to get semaphore

and network traffic stops for a few seconds.

Does it ring a bell to someone ? Is it a hardware failure or software issue ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--