* Re: [4.9.28] vmscan: shrink_slab: ext4_es_scan+0x0/0x150 negative objects to delete nr=-2147483624
2017-06-12 12:23 ` [4.9.28] vmscan: shrink_slab: ext4_es_scan+0x0/0x150 negative objects to delete nr=-2147483624 Rabin Vincent
@ 2017-06-12 14:06 ` Vlastimil Babka
0 siblings, 0 replies; 2+ messages in thread
From: Vlastimil Babka @ 2017-06-12 14:06 UTC (permalink / raw)
To: Rabin Vincent, Marc Burkhardt, shli, mhocko; +Cc: linux-kernel, linux-mm
On 06/12/2017 02:23 PM, Rabin Vincent wrote:
> On Thu, May 18, 2017 at 07:21:49AM +0200, Marc Burkhardt wrote:
>> tonight my dmesg was flooded with mesages like
>>
>> vmscan: shrink_slab: ext4_es_scan+0x0/0x150 negative objects to delete nr=-2147483624
>>
>> Is that an integer overflow happening in ext4?
>>
>> It's the first time I see this message. Any help on how to debug/reprocude this
>> are appreciated. Please advice if you want me to investigate this.
>
> I haven't attempted to debug nor reproduce it, but what I can tell you
> is that it does not not have anything to with ext4. I've seen similar
> messages with a completely different slab, on 4.9.26:
This alone looks suspicious in do_shrink_slab()?
unsigned long long delta;
long total_scan;
...
total_scan += delta;
> [367594.725081] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482285
> [367595.046073] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147479427
> [367595.279228] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482317
> [367595.459529] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482353
> [367595.497191] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482386
> [367595.521578] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482413
> [367595.551109] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482501
> [367598.344400] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482458
> [367598.369103] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482493
> [367598.403148] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482521
> [367598.422815] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482611
> [367598.524128] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147483238
> [367601.554775] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482245
> [367601.582922] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482279
> [367601.620175] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482307
> [367602.958946] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147479516
> [367603.630417] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482412
> [367603.746885] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482512
> [367603.769490] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482217
> [367604.155461] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147479940
> [367604.174624] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482635
> [367604.197573] vmscan: shrink_slab: super_cache_scan+0x0/0x19c negative objects to delete nr=-2147482595
>
> I don't see any fixes/changes to mm/vmscan.c in newer 4.9-stable kernels
> other than these ones which were already merged v4.9.14:
>
> $ git shortlog v4.9..v4.9.30 -- mm/vmscan.c
> Michal Hocko (3):
> mm, memcg: fix the active list aging for lowmem requests when memcg is enabled
> mm, vmscan: cleanup lru size claculations
> mm, vmscan: consider eligible zones in get_scan_count
>
> Shaohua Li (1):
> mm/vmscan.c: set correct defer count for shrinker
>
> Perhaps one of the above people or someone else in linux-mm recognizes this.
>
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