"Tor unexpectedly exited." is not clear enough

There are several different issues with the same error message:

• legacy/trac#9541 (moved)
• legacy/trac#12501 (moved)
• legacy/trac#13030 (moved)
• legacy/trac#18939 (moved)
• legacy/trac#18994 (moved)
• legacy/trac#19957 (moved)
• legacy/trac#21053 (moved)
• legacy/trac#22456 (moved)
• legacy/trac#23380 (moved)
• legacy/trac#24619 (moved)
• legacy/trac#25133 (moved)
• legacy/trac#25868 (moved)
• legacy/trac#27110 (moved)
• comment:4:ticket:27351
• comment:7:ticket:27407