[Xen-devel] [BUG] xl create -c with pygrub hangs in xen 4.4.0-rc5

[M A Young <m.a.young@xxxxxxxxxxxx>]

I was trying xen-4.4.0-rc5 with my standard set up (booting a pv guest 
using pygrub as a bootloader) but this no longer works. I would expect to 
get a boot menu where I could select a kernel and the guest, but nothing 
happens. If I examine the bootloader.1.log file I find the pygrub output I 
would expect to see on the console, and the output of xenstore-ls suggests 
pygrub is selecting the default kernel (as it would without input) and 
exiting, but xentop doesn't report any cpu usage on the guest. It seems xl 
has created a child process that doesn't exit, though if I kill the child 
process by hand the boot does continue.
I traced the change in behaviour to the commit 
http://xenbits.xenproject.org/gitweb/?p=xen.git;a=commit;h=5f0c4a78100382972b4d2a71a04b90e015e9fe87
"libxl: fork: Share SIGCHLD handler amongst ctxs". If I revert this then 
I get the expected behaviour again, though I haven't worked out why this 
patch cause the effects I am seeing.
        Michael Young

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