ERR redis runtime_error ai_generated true

ERR Error running script (call to f_<sha>): @user_script: <line>: Stack overflow in Lua script

ID: redis/lua-script-stack-overflow

Also available as: JSON · Markdown · 中文
75%Fix Rate
82%Confidence
1Evidence
2023-04-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
redis 7.0 active — — —
redis 7.2 active — — —
redis 6.2 active — — —
redis 5.0 active — — —

Root Cause

Lua script exceeded the maximum call stack depth, typically due to deep recursion or excessive nested function calls.

generic

中文

Lua 脚本超过了最大调用堆栈深度，通常是由于深度递归或过多嵌套函数调用。

Official Documentation

https://redis.io/docs/latest/develop/interact/programmability/lua-api/

Workarounds

  1. 85% success Refactor the Lua script to use iterative loops instead of recursion, e.g., replace recursive function with a while loop: while condition do ... end 
    Refactor the Lua script to use iterative loops instead of recursion, e.g., replace recursive function with a while loop:
while condition do ... end
  2. 70% success Reduce the depth of nested function calls by flattening logic or using tail-recursive calls if Lua version supports (Redis Lua 5.1 does not). 
    Reduce the depth of nested function calls by flattening logic or using tail-recursive calls if Lua version supports (Redis Lua 5.1 does not).

中文步骤

  1. Refactor the Lua script to use iterative loops instead of recursion, e.g., replace recursive function with a while loop:
while condition do ... end
  2. Reduce the depth of nested function calls by flattening logic or using tail-recursive calls if Lua version supports (Redis Lua 5.1 does not).

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Redis does not expose a Lua stack size configuration; the limit is hardcoded.

  2. 50% fail

    The script execution mechanism is the same; the error is script logic, not caching.

  3. 80% fail

    Stack overflow is a call depth issue, not a memory allocation issue; more memory does not increase stack depth.