Preloading the attached shared library solves the hang on non-udev
initrds. Compile with

gcc -shared -fPIC -o no-udev.so UdevDisableLib.c -ldl

Difference seems to be that /dev/mapper/ entries are created a s block
devices, not symlinks any more. But that does not hurt in my usecase
(kexec will kill the whole initrd immediately afterwards).

** Attachment added: "UdevDisableLib.c"
   
https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/1589083/+attachment/5044911/+files/UdevDisableLib.c

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https://bugs.launchpad.net/bugs/1589083

Title:
  crypsetup hangs when only cryptsetup-bin is installed

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