Comment 1 for bug 2049197

Thanks for reporting this issue.

I was able to reproduce this in a fresh jammy installation in a VM.

Reproducer (as proposed in https://github.com/ruby/ruby/pull/7663):

# apt update && apt install -y ruby ruby-nokogiri

# cat > reproducer.rb <<EOF
require 'nokogiri'

# must have an error in it to cause pthread_setspecific to be called
html = "<div foo='asdf>asdf</div>"

Thread.new { Nokogiri::HTML4::Document.parse(html) }
sleep 3 # THREAD_CACHE_TIME

exit 0
EOF

# while true; do ruby reproducer.rb; done

After a while (this may take several minutes to manifest) I got the reported error:

[BUG] Segmentation fault at 0x0000000000000440[BUG] Segmentation fault at 0x0000000000000440
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux-gnu]

-- Machine register context ------------------------------------------------
 RIP: 0x00007c8ec2ac2fcb RBP: 0x000059ae2e596d20 RSP: 0x00007c8ebc5fed70
 RAX: 0x0000000000000000 RBX: 0x00007c8ebc5ff640 RCX: 0x0000000000000006
 RDX: 0x0000000000000002[BUG] [BUG] Segmentation fault at 0x0000000000000440
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux-gnu]

-- Machine register context ------------------------------------------------
 RIP: 0x000075c4b4ec2fcb RBP: 0x000062693580e190 RSP: 0x000075c4ae9fed70
 RAX: 0x0000000000000000 RBX: 0x000075c4ae9ff640 RCX: 0x0000000000000006
 RDX: 0x0000000000000002 RDI: 0x000062693580e190 RSI: 0x0000000000000000
  R8: 0x000075c4ae9fede4 R9: 0x00000000000000ca R10: 0x0000000000000000
 R11: 0x0000000000000246 R12: 0x000075c4b5170b40
 R13: 0x000075c4ae9fedc0