[vbox-dev] Memory leak in VBox 4.1.0 r73009

[Frank Mehnert]

Larry,

On Sunday 14 August 2011 03:39:52 Larry Finger wrote:
> Kmemleak shows the following leak in the VB kernel module for version 4.1.0
> r73009 (x86_64):
> 
> unreferenced object 0xffff88006baf1d00 (size 128):
>    comm "VirtualBox", pid 549, jiffies 4314134921 (age 30845.876s)
>    hex dump (first 32 bytes):
>      19 01 09 18 00 00 00 80 58 00 00 00 58 00 00 00  ........X...X...
>      03 01 92 18 0f 32 9c 65 2e 2e 00 00 ad 4e ad de  .....2.e.....N..
>    backtrace:
>      [<ffffffff81122d77>] create_object+0x127/0x2b0
>      [<ffffffff813580b1>] kmemleak_alloc+0x21/0x50
>      [<ffffffff8111cd33>] __kmalloc+0x113/0x1c0
>      [<ffffffffa04c21ca>] rtR0MemAllocEx+0x5a/0x160 [vboxdrv]
>      [<ffffffffa04bff03>] VBoxHost_RTMemAllocTag+0x13/0x30 [vboxdrv]
>      [<ffffffffa04c4cfb>] VBoxHost_RTSemFastMutexCreate+0x1b/0x90 [vboxdrv]
>      [<ffffffffa04d7ff4>] g_abExecMemory+0x28f4/0x180000 [vboxdrv]
>      [<ffffffffa04eaef9>] g_abExecMemory+0x157f9/0x180000 [vboxdrv]
>      [<ffffffffa04bd619>] supdrvIOCtl+0x11b9/0x2820 [vboxdrv]
>      [<ffffffffa04b8435>] VBoxDrvLinuxIOCtl+0x135/0x200 [vboxdrv]
>      [<ffffffff81137de6>] do_vfs_ioctl+0x96/0x550
>      [<ffffffff811382ea>] sys_ioctl+0x4a/0x80
>      [<ffffffff8136befb>] system_call_fastpath+0x16/0x1b
>      [<ffffffffffffffff>] 0xffffffffffffffff
> 
> I have not yet tried to find the source of the leak.

is this really a leak? I see similar kmemleak complaints if a VM is started
but these complaints vanish as soon as the VM is terminated. Also, I also
don't see that the number of the complaints is growing.

Kind regards,

Frank
-- 
Dr.-Ing. Frank Mehnert
Senior Manager Software Development Desktop Virtualization, VirtualBox
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