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Graphics Card ... or Something Else [Understood]
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adriend
n00b
n00b


Joined: 21 May 2005
Posts: 3
Location: Sceaux - Hauts-de-Seine - France

PostPosted: Sat Dec 09, 2017 10:11 pm    Post subject: Reply with quote

I got the same error building kernel 4.14.4-gentoo with CONFIG_ORC_UNWINDER=y and this thread is the only reference to it on the internet :
NeddySeagoon wrote:
Code:
/bin/sh: line 1: 29635 Segmentation fault      ./tools/objtool/objtool orc generate --no-fp "arch/x86/kernel/x86_init.o"


I just switched the linker to ld.bfd (instead of ld.gold) and it builds fine.
Code:
binutils-config --linker ld.bfd

The linker can of course be switched back to ld.gold after kernel build.

(as a side note I switched to BFD linker because of x32 VDSO build error but then I tried again CONFIG_ORC_UNWINDER and it worked...)
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 41695
Location: 56N 3W

PostPosted: Sun Dec 31, 2017 1:54 pm    Post subject: Reply with quote

I'v been poking at this every few days, trying something else.

Different kernels, the new amdgpu in kernel-4.15
Putting the graphics card in the primary and secondary slots.
Turning off various combinations of CPU cores.
Everything changed the frequency of the lockups but nothing eliminated them.

Its now run almost three days without a lockup.
I had to turn off Message Signalled Interrupts.

MSI going wrong explains the lockups. The CPU gets the address of the IRQ service routine in the message and begins executing code there ... only sometimes the message is garbled.
I'll put it down to using a PCIe v3 card in a PCIe v2.1 slot and needing to use the probably not well tested PCIe fallback (to the card) signalling.

The problem is not really solved but it is understood.

-- edit --

Maybe not. I turned the screensaver on and went away for a few hours.
It was locked up when I came back.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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