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While invoking mtools frequently, the unblocking request caused race issue. Here is an example of syslinux [snip] dd if=/dev/zero of=floppy.img bs=1024 count=144 losetup /dev/loop1 floppy.img mkdosfs /dev/loop1 syslinux -i /dev/loop1 |plain floppy: device "/proc/6351/fd/3" busy (Resource temporarily unavailable): |Cannot initialize 'S:' |Bad target s:/ldlinux.sys [snip] The idea is from: https://bugzilla.redhat.com/show_bug.cgi?id=1235016 https://groups.google.com/a/chromium.org/forum/#!msg/chromium-os-dev/bRPUCFHoBTQ/ZjB8kjjx1vUJ (From OE-Core rev: 927fad7881841a58e1d88f3a6ce070eaa66ba1a5) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>