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SubjectRe: bisect results of MSI-X related panic (help!)
On Mon, 12 Oct 2009, Tejun Heo wrote:
> > any other debugging tricks/ideas?
>
> Hmm... stackprotector adds considerable amount of stack usage and it
> could be you're seeing stack overflow which would also explain the
> random crashes you've been seeing. Do you have DEBUG_STACKOVERFLOW
> turned on? This is on x86_64, right?

Hi, thanks for your response,

[root@jbrandeb-hc linux-2.6.32-rc1]# grep STACKO .config
CONFIG_DEBUG_STACKOVERFLOW=y

[root@jbrandeb-hc linux-2.6.32-rc1]# grep X86_64 .config
CONFIG_X86_64=y
CONFIG_X86_64_SMP=y
CONFIG_X86_64_ACPI_NUMA=y

stack size is 8K

I tried Jarek's suggestion of CPUMASK_OFFSTACK and still panic.
[66027.266057] Kernel panic - not syncing: stack-protector: Kernel stack
is corrupted in: ffffffff810b4eb0
[66027.266059]
[66027.266070] Kernel panic - not syncing: stack-protector: Kernel stack
is corrupted in: ffffffff81472856
[66027.266071]
[66027.266081] Pid: 0, comm: swapper Tainted: G W
2.6.32-rc2-git-debug #6
[66027.266086] Call Trace:

that was all I got. Interesting double fault, that hadn't happened
before.

the symbols might be off slightly since I rebuilt the kernel, but this was
initial poke at offsets above in gdb
(gdb) l *0xffffffff810b4eb0
0xffffffff810b4eb0 is in dynamic_irq_cleanup (kernel/irq/chip.c:86).
81 desc->handle_irq = handle_bad_irq;
82 desc->chip = &no_irq_chip;
83 desc->name = NULL;
84 clear_kstat_irqs(desc);
85 spin_unlock_irqrestore(&desc->lock, flags);
86 }
87
88
89 /**
90 * set_irq_chip - set the irq chip for an irq
(gdb) l *0xffffffff8147285
No source file for address 0xffffffff8147285.
(gdb) l *0xffffffff81472856
0xffffffff81472856 is in show_kprobe_addr (kernel/kprobes.c:1306).
1301 struct hlist_head *head;
1302 struct hlist_node *node;
1303 struct kprobe *p, *kp;
1304 const char *sym = NULL;
1305 unsigned int i = *(loff_t *) v;
1306 unsigned long offset = 0;
1307 char *modname, namebuf[128];
1308
1309 head = &kprobe_table[i];
1310 preempt_disable();




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