On Thu, Jun 28, 2012 at 8:45 AM, Alex Schuster <wo...@wonkology.org> wrote:
> Alex Schuster writes:
>
>> Helmut Jarausch writes:
>>
>> > On 06/27/2012 04:44:34 AM, meino.cra...@gmx.de wrote:
>
>> > > i accidentally tried to mount the extended partition /dev/sda4
>> > > from this disk:
>> [...]
>> > > which results in a hanging mount process, which cannot be killed.
>
>> > I cannot tell you if kernel hanging in this case is normal.
>> >
>> > But, if there is any problem during mount, the kernel seems to hang.
>> > As far as I remember, it only has a very long time out, but it will
>> > 'kill' that mount request some time.
>>
>> Let's see how long 'very long' is, it's hanging for over one hour now. I
>> will wait some more hours, but that would be one really long timeout.
>
> All I can say now is that the timeout, if there is one, must be larger
> than 24 hours.
>
> Isn't this weird?

Almost all cases of linux hangs I've ever experienced have been from either:

1) mount/unmount
2) insmod/rmmod

and they usually last forever. Sometimes prevent proper shutdown,
requiring SysRq magic or usually hard power-off...

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