Re: swapoff() runs forever

[Richard Weinberger]

Am 09.04.2012 07:35, schrieb Konstantin Khlebnikov:
> Richard Weinberger wrote:
>> Hi!
>>
>> I'm observing a strange issue (at least on UML) on recent Linux kernels.
>> If swap is being used the swapoff() system call never terminates.
>> To be precise "while ((i = find_next_to_unuse(si, i)) != 0)" in try_to_unuse()
>> never terminates.
>>
>> The affected machine has 256MiB ram and 256MiB swap.
>> If an application uses more than 256MiB memory swap is being used.
>> But after the application terminates the free command still reports that a few
>> MiB are on my swap device and swappoff never terminates.
> 
> After last tmpfs changes swapoff can take minutes.
> Or this time it really never terminates?

I've never waited forever. ;-)
Once I've waited for >30 minutes.

I don't think that it's related to tmpfs because it happens
also while shutting down the system after all filesystems have been unmounted.

Thanks,
//richard

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