[Buildroot] autobuilder flock hangs

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, Hollis, All,

On 2018-08-13 23:18 +0200, Thomas Petazzoni spake thusly:
> Hello,
> 
> +Yann in Cc.
> 
> On Mon, 13 Aug 2018 11:18:10 -0700, Hollis Blanchard wrote:
> 
> > >>        x86_64 |                azure-iot-sdk-c | TIM | http://autobuild.buildroot.net/results/43b9bccacd88397d732fda16d998fa7dc001f900 |  
> > > Hollis: your autobuilder times out when downloading this package, could
> > > you have a look ? See
> > > http://autobuild.buildroot.net/?reason=azure-iot-sdk-c%.  
> > 
> > 
> > >>        xtensa |                 linux-firmware | TIM | http://autobuild.buildroot.net/results/34b8bb8824d369e5b53e2a4effd1a8d18df07aee |  
> > > Hollis, once again your autobuilder timing out when downloading stuff:
> > > http://autobuild.buildroot.net/?reason=linux-firmware%.  
> > flock was hanging. I don't know why; have you experienced anything like 
> > that?
> Not that I remember. Yann ?

Nope.

flock(1) is just a utility wrapper around flock(2), which is itself a
syscall to the kernel. The kernel frees a lock as soon as the process
that aqcquired it closes the filedescriptor(s) used to acquire that
lock, which also automatically occurs when the process dies (naturally
or forcibly).

So, barring a kernel bug, I'd say something else also had a lock...

You can get the list of process haviong locks with the lslocks command.

Regards,
Yann E. MORIN.

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