Ruby

Bug #21772

Updated by gearoiddc (Gearoid de Cleir) 3 days ago

I'm getting a YJIT has panicked crash in my rails app locally when a part of my application rapidly uses a gem I have "auto_session_timeout". 

 If I patch the gem by changing the symbol to a string the error goes away. 



 ``` ruby 
   module AutoSessionTimeout 
     private 

     def session_expired?(c) 
       c.session[:auto_session_expires_at].<(Time.now) 
     end 
   end 

 ``` 

 to 

 ``` ruby 
   def session_expired?(c) 
     c.session["auto_session_expires_at"].<(Time.now) 
   end 
 ``` 

 I can consistently cause the crash but I can't find a way to reproduce the error in a snipped of code. 

 But it looks like YJIT is keeping the key as a sybmol even though it was converted to a string. 


 ``` ruby 
 

 def [](key) 
   load_for_read! 
   key = key.to_s 

   if key == "session_id" # <-- crash occurs here 
     id&.public_id 
   else 
     @delegate[key] 
   end 
 end 
 ``` 


 

 Didn't have the same issue on ruby 3.3 with YJIT. 


 System Configuration 
 Ruby Version: ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +YJIT +PRISM [x86_64-linux] 

 Environment:    Ubuntu 22.04.5 LTS (x86_64) 


 Backtrace & Logs 


 ``` 
 ruby: YJIT has panicked. More info to follow... 

 thread '<unnamed>' panicked at ./yjit/src/codegen.rs:5018:9: 
 StackOpnd(1) should be a heap object, but was ImmSymbol for VALUE(137647867319760) 
 stack backtrace: 
    0: __rustc::rust_begin_unwind 
              at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:697:5 
    1: core::panicking::panic_fmt 
              at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/core/src/panicking.rs:75:14 
    2: yjit::codegen::jit_guard_known_klass 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/codegen.rs:5018:9 
    3: yjit::codegen::gen_equality_specialized 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/codegen.rs:3690:9 
    4: yjit::codegen::gen_opt_eq 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/codegen.rs:3753:29 
    5: yjit::codegen::gen_single_block 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/codegen.rs:1382:22 
    6: yjit::core::gen_block_series_body 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/core.rs:3088:23 
    7: yjit::core::gen_block_series 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/core.rs:3066:18 
    8: yjit::core::branch_stub_hit_body 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/core.rs:3604:17 
    9: yjit::core::branch_stub_hit::{{closure}}::{{closure}} 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/core.rs:3493:36 
   10: yjit::stats::with_compile_time 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/stats.rs:1084:15 
   11: yjit::core::branch_stub_hit::{{closure}} 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/core.rs:3493:13 
   12: std::panicking::catch_unwind::do_call 
              at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:589:40 
   13: std::panicking::catch_unwind 
              at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panicking.rs:552:19 
   14: std::panic::catch_unwind 
              at /rustc/1159e78c4747b02ef996e55082b704c09b970588/library/std/src/panic.rs:359:14 
   15: yjit::cruby::with_vm_lock 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/cruby.rs:688:21 
   16: yjit::core::branch_stub_hit 
              at /home/travis/.rvm/src/ruby-3.4.7/yjit/src/core.rs:3492:9 
   17: <unknown> 
 note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace. 
 /home/gearoid/.rvm/gems/ruby-3.4.7@7.2.3/gems/actionpack-7.2.3/lib/action_dispatch/request/session.rb:118: [BUG] YJIT: panicked at ./yjit/src/codegen.rs:5018:9: 
 StackOpnd(1) should be a heap object, but was ImmSymbol for VALUE(137647867319760) 
 ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +YJIT +PRISM [x86_64-linux] 

 ``` 

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