Description:
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When running php -r '\random_int(0,20);' on my QNAP NAS, PHP always returns an error. The kernel on my NAS returns EPERM instead of ENOSYS, thus degrading to /dev/urandom does not happen.
This has been fixed in python a while back (https://bugs.python.org/issue27955, albeit it does not catch EFAULT).

I suspect this behaviour exists in every PHP version that uses the getrandom() syscall

Test script:
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\random_int(0,20);

Actual result:
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PHP Fatal error:  Uncaught Exception: Could not gather sufficient random data in Command line code:1
Stack trace:
#0 Command line code(1): random_int(0, 20)
#1 {main}
  thrown in Command line code on line 1

strace output:

getrandom(0xbde13510, 4, 0)             = -1 EFAULT (Bad address)
brk(0xb6587000)                         = 0xb6587000
writev(2, [{iov_base="", iov_len=0}, {iov_base="PHP Fatal error:  Uncaught Excep"..., iov_len=206}], 2PHP Fatal error:  Uncaught Exception: Could not gather sufficient random data in Command line code:1
Stack trace:
#0 Command line code(1): random_int(0, 20)
#1 {main}
  thrown in Command line code on line 1) = 206
writev(2, [{iov_base="\n", iov_len=1}, {iov_base=NULL, iov_len=0}], 2