Actions
Bug #21772
closed
ruby: YJIT has panicked StackOpnd(1) should be a heap object, but was ImmSymbol for VALUE(137647867319760)
Bug #21772:
ruby: YJIT has panicked StackOpnd(1) should be a heap object, but was ImmSymbol for VALUE(137647867319760)
Description
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.
module AutoSessionTimeout
private
def session_expired?(c)
c.session[:auto_session_expires_at].<(Time.now)
end
end
to
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.
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]
Files
Updated by 
Updated by 
Updated by
Actions