On Centos 4.3 as invoked by xend it seems that SIGUSR1 can be blocked.
This is almost certainly a libc bug; I checked by using sigprocmask to
obtain what was allegedly the current signal mask and printing it out
and SIGUSR1 wasn't listed, although my strace showed rt_sigprocmask
calls which clearly implied it was blocked - and indeed it wasn't
delivered.
Explicitly enabling it is an easy workaround.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
projects / qemu-xen-4.2-testing.git / commit