[Crash-utility] Re: crash 4.0-8.9 w/ 2.6.30-rc6

----- "Mike Snitzer" <snitzer(a)redhat.com&gt; wrote: > Hi Dave, > > crash is failing with the following when I try to throw a 2.6.30-rc6 > vmcore at it: > > crash: invalid structure size: x8664_pda > FILE: x86_64.c LINE: 584 FUNCTION: x86_64_cpu_pda_init() > > [/usr/bin/crash] error trace: 449c7f => 4ce815 => 4d00cf => 50936d > > 50936d: SIZE_verify+168 > 4d00cf: (undetermined) > 4ce815: x86_64_init+3205 > 449c7f: main_loop+152 > > I can dig deeper but your help would be very much appreciated. > > Mike The venerable "been-there-since-the-beginning-of-x86_64" x8664_pda data structure no longer exists. It was a per-cpu array of a fundamental data structure that things like "current", the per-cpu magic number, the cpu number, the current kernel stack pointer, the per-cpu IRQ stack pointer, etc. all came from: /* Per processor datastructure. %gs points to it while the kernel runs */ struct x8664_pda { struct task_struct *pcurrent; /* Current process */ unsigned long data_offset; /* Per cpu data offset from linker address */ unsigned long kernelstack; /* top of kernel stack for current */ unsigned long oldrsp; /* user rsp for system call */ #if DEBUG_STKSZ > EXCEPTION_STKSZ unsigned long debugstack; /* #DB/#BP stack. */ #endif int irqcount; /* Irq nesting counter. Starts with -1 */ int cpunumber; /* Logical CPU number */ char *irqstackptr; /* top of irqstack */ int nodenumber; /* number of current node */ unsigned int __softirq_pending; unsigned int __nmi_count; /* number of NMI on this CPUs */ int mmu_state; struct mm_struct *active_mm; unsigned apic_timer_irqs; } ____cacheline_aligned_in_smp; There have been upstream rumblings about replacing it with a more efficient per-cpu implementation for some time now, but I haven't studied how the new scheme works yet. It will be a major re-work for the crash utility, so you're pretty much out of luck for now. (Try "gdb vmlinux vmcore" for basic info)

In the meantime, can you give me a copy of your vmcore? (offline -- note that I'm forwarding this to the crash-utility mailing list). And I'll start working on it.