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SubjectRe: Linus GIT 3.17.0+ - BUG: unable to handle kernel paging request - IP: [<ffffffff81109e8d>] scan_block+0x59/0x100
Hi Miles,

On 15 October 2014 04:43, Miles Lane <miles.lane@gmail.com> wrote:
> [ 68.164917] BUG: unable to handle kernel paging request at ffff88021dc52000
> [ 68.164957] IP: [<ffffffff81109e8d>] scan_block+0x59/0x100
> [ 68.164987] PGD 2902067 PUD 2905067 PMD 21fdf2067 PTE 800000021dc52060

My reading of the x86 _PAGE_BIT_* macros show that this is not present.

> [ 68.165020] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC

And this could be caused by CONFIG_DEBUG_PAGEALLOC, though kmemleak
should not try to access such memory.

> [ 68.165945] Call Trace:
> [ 68.165960] [<ffffffff81528559>] ? _raw_spin_lock_irqsave+0x48/0x52
> [ 68.165988] [<ffffffff8110a016>] ? scan_gray_list+0xe2/0x15f
> [ 68.166015] [<ffffffff81109feb>] scan_gray_list+0xb7/0x15f
> [ 68.166040] [<ffffffff8110a32f>] kmemleak_scan+0x29c/0x466
> [ 68.166066] [<ffffffff8110a84d>] ? kmemleak_write+0x354/0x354
> [ 68.166092] [<ffffffff8110a8cf>] kmemleak_scan_thread+0x82/0xa4

I have a couple of questions:

1. Are there any messages prior to the dump you posted, like kmemleak
getting disabled?
2. Can you still reproduce the problem with !CONFIG_DEBUG_PAGEALLOC?

Thanks,

Catalin


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