getrandom() syscall failure warning should be a notice and worded better
The logging improvement for error handling of the
getrandom() syscall in #24500 (moved) could be further improved:
- The log level should possibly be NOTICE rather than WARN.
- The log message should mention that tor will fall back to alternative sources of randomness.
- Maybe we want to mention header/kernel version mismatches as a specific common reason for this issue.
Yes, some of the fallbacks are somewhat dangerous, like
/dev/urandom might not be seeded yet. etc,.
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