Uart0 interrupts on high level on APU.1D4 –ver. 2.2
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Sometimes, after two or more days, without serial connection established on a full installation from USB stick to mSATA 16GB, the interrupts on uart0 (console) are on high level:
[2.2-RELEASE][admin@box.lan]/root: vmstat -i interrupt total rate irq4: uart0 526788821 1896 irq16: ath1 38711555 139 irq17: ehci0 ehci1+ 185438 0 irq18: ohci0 ohci1* 2 0 irq19: ath0 ahci0 11836455 42 irq256: hpet0:t0 309913938 1115 irq257: hpet0:t1 110004189 395 irq259: re0 61685974 222 irq260: re1 85377 0 irq261: re2 32864397 118 Total 1092076146 3930[2.2-RELEASE][admin@box.lan]/root: top -aSH ... PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 11 root 155 ki31 0K 32K RUN 1 46.8H 89.60% [idle{idle: cpu1}] 11 root 155 ki31 0K 32K CPU0 0 46.2H 87.50% [idle{idle: cpu0}] 12 root -76 - 0K 288K WAIT 0 1:36 3.37% [intr{swi0: uart uart}] ...Connecting to the serial console shows nothing, hitting ENTER -> nothing
Strg+C brings up a shell with prompt# # exit FreeBSD/amd64 (box.lan) (ttyu0) *** Welcome to pfSense 2.2-RELEASE-pfSense (amd64) on svea *** ...and solved the problem! The interrupts are gone!
Any ideas?
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Any messages in the main system log?
Was this a fresh 2.2 install or an upgraded 2.1.5?
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Was a fresh 2.2 RC install with some upgrade steps finally to Release.
Doesn't checked the system log, sorry…
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No messages in main system log regarding these issue.
It returns for 6-12 h every 6-12 h currently.
Any help?
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Ok, the problem was the connected serial cable with the other end open for all the time, means without termination of a serial device or serial-usb adapter. May be some signal reflection/induction on the open end back to the serial port on the APU.1D4 board.
