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#xen IRC Logs for 2022-06-22

---Logopened Wed Jun 22 00:00:14 2022
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09:13<bertieb>Hi folks, I have a DomU which was running for ~150 days failing to come up on 'xl create' (dom0 running xen 4.8 I think); it complains "unable to get domain type" / "unable to exec console client: No such file or directory"; pygrub bootloader shows up with the appropriate entry but shortly after selecting it the domU exits with those errors- how can I get more info?
09:15<bertieb>in /var/log/xen/bootloader.log the console output seems to be reproduced without any additional info, the xl-domu.log for the guest reports the domain shuts down for reason code 3
09:46<royger>bertieb: would be helpul to provide the output of `xl -vvv create ...` (note the -vvv) on a pastebin
09:50<bertieb>royger: sure thing, I'd done it with a single -v but didn't see anything helpful, 2 ticks
09:52<bertieb>https://termbin.com/t0rd
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09:55<andyhhp>shutdown reason 3 is crash. Anything in `xl dmesg` ?
09:55<andyhhp>setting on_crash="preserve" should keep the VM around after it crashes
09:56<bertieb>andyhhp: reapeated "(XEN) CPU0: Temperature above threshold" / "(XEN) CPU0: Running in modulated clock mode"
09:57<andyhhp>well that's a different problem
09:57<andyhhp>you need to sort out your fan
09:58<bertieb>andyhhp: I think that's a false positive; CPU temps are okay
09:58<bertieb>currently: "Core 0: +56.0°C (high = +80.0°C, crit = +98.0°C)" (etc)
09:59<andyhhp>modulated clock mode is emergency "the CPU is about to melt" mode
10:00<andyhhp>you're very lucky the system is still alive
10:00<bertieb>very odd
10:00<bertieb>sinec it's (seemingly) running at full frequency currently
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10:01<bertieb>via on_crash=preserve I see the domU is having trouble mounting root:
10:01<bertieb>[ 0.167238] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
10:02<andyhhp>might be load based and it may have cooled down in the meantime. Doesn't mean you've not got a cooling issue
10:02<bertieb>yeah, true I'll keep any eye on it
10:02<andyhhp>just might mean there's no load right now and it's cooled down via other means
10:02<bertieb>yeah, thats possible
10:03<bertieb>I'm kinda confused as to why it can't mount root is it clearly had it mounted fine before I shut down; and I can mount the root from the Dom0
10:03<andyhhp>you should never see thermal alerts in Xen. You need to vac out and re-seat the fan at the earliest convenient point
10:04<andyhhp>it may or may not be relevant to your other issue here, but it definitely isn't helping
10:04<bertieb>sure
10:04<bertieb>I don't like the idea of a CPU dying to heatstroke either :)
10:05<bertieb>my medium-term intnetion is to decomission this machine
10:05<bertieb>but I need to get data off 12 of the disks in it
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11:13-!-scottwd_ is "Scott Davis" on #xen #virt
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11:42<bertieb>apologies if I missed replies
11:42<bertieb>the Dom0 fell over in a weird way (surprise!)
11:43<bertieb>and took my ZNC instance on a different DomU with it
11:45<bertieb>thankfully no complaints about temp yet
11:46<bertieb>the original issue seemed to be the format of the initramfs of the domu
11:47<bertieb>the version of Xen i have seems to choke on newer kernels, so I had pinned to 4.17.11
11:47<bertieb>but initramfs compression format changed, or somesuch
11:48<bertieb>I have somewhat hackishly disabled compression on initramfs in the meantime, at least until I can update the dom0 or the machine
11:49<bertieb>cheers for the tip about on_crash="preserve", that got me heading in the right direction
11:49<royger>hm, initrd compression shouldn't matter for Xen, kernel compression does
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13:02-!-andyhhp is "Andrew Cooper" on #x86 #xsxoteams #xen #xendevel
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14:10-!-ChmEarl is "Mark Pryor" on #xen ##xen-packaging #mock #packaging #virt
15:12<bertieb>weird
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---Logclosed Thu Jun 23 00:00:15 2022