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Reboot loop: Where to start?
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jesnow
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PostPosted: Sun Apr 29, 2018 11:06 pm    Post subject: Reboot loop: Where to start? Reply with quote

At my last reboot (the system had been up for months), my kernel inexplicably wouldn't boot. In fact it didn't panic or throw any kind of error at all, it gives "bios check successfully completed" and reboots in an infinite loop. Fortunately I had an old kernel that still works so I can write this. How can I even begin to troubleshoot this problem if the kernel gives no sign of something wrong?

Kernel that now infinitely reboots: 4.9.76-gentoo-r1
Kernel that works: 4.12.12

I'm building the most recent kernel (why was it not installed by emerge -DNua world?): 4.9.95, just because I don't know what else to try. Yes I'm still running 32 bit, yes I should upgrade. No there's no good reason to beyond everybody else has done it and is dropping support. I was just going to do that when this problem showed up. I'm not going to migrate from an unstable system.

Thanks to all in advance.

Jon.
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eccerr0r
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PostPosted: Mon Apr 30, 2018 2:23 am    Post subject: Reply with quote

Has this kernel or something from this series ever worked?

"bios check successfully completed" ... Is this the exact phrase in the kernel boot logs? What's the exact wording and capitalization?

You may want to try to configure a new kernel again without copying .config and see if you can get it working. Yes, PITA, but at least no accidental cruft.
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Jaglover
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PostPosted: Mon Apr 30, 2018 2:33 am    Post subject: Reply with quote

"bios check successfully completed"

Sounds like Lilo message.
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eccerr0r
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PostPosted: Mon Apr 30, 2018 2:45 am    Post subject: Reply with quote

Yeah, was wondering if it was in the bootloader that failed or not. If it was the bootloader, or bios, shouldn't look into kernel config at all... unless the kernel somehow didn't get the springboard linked (copied the right file? bzImage?)
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NeddySeagoon
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PostPosted: Mon Apr 30, 2018 9:18 am    Post subject: Reply with quote

jesnow,

A reboot loop like that sounds like an exception before the exception handler is initialised.
Its so early in the boot process that the kernel can't even panic.

Popular causes are Illegal Instructions and hardware failures.
If you are using lilo, forgetting to run /sbin/lilo can cause some strange failures too.
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jesnow
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PostPosted: Mon Apr 30, 2018 1:40 pm    Post subject: Reply with quote

"BIOS check successfully completed", sounds right, yes it is LILO. There are no kernel logs -- it doesn't get that far.

And yes this exact kernel worked before. It was my running kernel for two months (at least), now no more.

As an update, the 4.9.95 kernel at least boots, but refuses to recognize my logitech wireless mouse. So for now I'm using the deprecated 4.12 kernel that at least works. Mysterious.

But I really would like to have a stable working x86 kernel before I start the AMD64 migration.

Jon
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NeddySeagoon
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PostPosted: Mon Apr 30, 2018 1:43 pm    Post subject: Reply with quote

jesnow,

Boot into memtest86 and let it run a few cycles.
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