kvm_intel: Could not allocate 42 bytes percpu data

[Chegu Vinod]

Hello,

Lots (~700+) of the following messages are showing up in the dmesg of a 
3.10-rc1 based kernel (Host OS is running on a large socket count box 
with HT-on).

[   82.270682] PERCPU: allocation failed, size=42 align=16, alloc from 
reserved chunk failed
[   82.272633] kvm_intel: Could not allocate 42 bytes percpu data

... also call traces like the following...

[  101.852136]  ffffc901ad5aa090 ffff88084675dd08 ffffffff81633743 
ffff88084675ddc8
[  101.860889]  ffffffff81145053 ffffffff81f3fa78 ffff88084809dd40 
ffff8907d1cfd2e8
[  101.869466]  ffff8907d1cfd280 ffff88087fffdb08 ffff88084675c010 
ffff88084675dfd8
[  101.878190] Call Trace:
[  101.880953]  [<ffffffff81633743>] dump_stack+0x19/0x1e
[  101.886679]  [<ffffffff81145053>] pcpu_alloc+0x9a3/0xa40
[  101.892754]  [<ffffffff81145103>] __alloc_reserved_percpu+0x13/0x20
[  101.899733]  [<ffffffff810b2d7f>] load_module+0x35f/0x1a70
[  101.905835]  [<ffffffff8163ad6e>] ? do_page_fault+0xe/0x10
[  101.911953]  [<ffffffff810b467b>] SyS_init_module+0xfb/0x140
[  101.918287]  [<ffffffff8163f542>] system_call_fastpath+0x16/0x1b
[  101.924981] kvm_intel: Could not allocate 42 bytes percpu data


Wondering if anyone else has seen this with the recent [3.10] based 
kernels esp. on larger boxes?

There was a similar issue that was reported earlier (where modules were 
being loaded per cpu without checking if an instance was already 
loaded/being-loaded). That issue seems to have been addressed in the 
recent past (e.g. https://lkml.org/lkml/2013/1/24/659 along with a 
couple of follow on cleanups)   Is the above yet another variant of the 
original issue or perhaps some race condition that got exposed when 
there are lot more threads ?

Vinod



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