Re: [arch-releng] regression with race condition on pxe boot with nbd

[Christian Hesse]

Christian Hesse <l...@eworm.de> on Tue, 2016/05/24 14:35:
> Hello everybody,
> 
> with my latest builds I see a regression on pxe boot with nbd. About 50% of
> boots fail. The nbd module is loaded, nbd-client attaches the device, but
> mount fails:
> 
> mount: you must specify the filesystem type
> ERROR; Failed to mount '/dev/nbd0'
>    Falling back to interactive prompt
>    You can try to fix the problem manually, log out when you are finished
> 
> A simple mount allows to continue boot:
> 
> mount /dev/nbd0 /run/archiso/bootmnt/
> <Ctrl>-d
> 
> My guess is that linux 4.6 introduced a race condition. Any idea how to fix
> or handle this?

Looks like adding a boot parameter

nbd.nbds_max=2

fixes this (or makes it a lot less likely to happen). However this is still
more of a workaround...
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}

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