From: Vince Weaver <vince@xxxxxxxxxx>
Date: Thu, 18 Jan 2007 13:33:15 -0500 (EST)
>
> I am running Linux 2.6.20-rc5 on an UltraSparc T1 (Niagara) with 24
> threads.
>
> When trying to compile gcc-4.2-20070117 gcc snapshot from scratch, the
> following BUG() happens:
What distribution and version are you running? I tried to dump
the code at address 0x1a368 of the /bin/sh binary running on
Ubuntu Dapper and it didn't show a code location which could
trigger this code path.
> The relevant code is:
>
> 409 /* If we took a ITLB miss on a non-executable page, catch
> 410 * that here.
> 411 */
> 412 if ((fault_code & FAULT_CODE_ITLB) && !(vma->vm_flags & VM_EXEC)) {
> 413 BUG_ON(address != regs->tpc);
> 414 BUG_ON(regs->tstate & TSTATE_PRIV);
> 415 goto bad_area;
> 416 }
>
> What's the next step in tracking down what's going on?
Try to print out the "fault_code", "address", and regs->tpc value
when this triggers.
I think the thread struct is being corrupted by some parallel access
and this corrupts the fault state, in particular "fault_code" is
garbage.
But I can only confirm that theory with the information I've
requested above.
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