git-bash fails with "couldn't create signal pipe, Win32 error 5" when sandboxing is enabled

What version of Codex is running?

codex-cli 0.61.0

What subscription do you have?

pro

Which model were you using?

gpt5.1-codex-max

What platform is your computer?

Microsoft Windows NT 10.0.19045.0 x64

What issue are you seeing?

When sandboxing is enabled codex fails to execute any git bash commands and fails with:

  └       1 [main] bash (39564) cygheap_user::init: NtSetInformationToken (TokenDefaultDacl), 0xC0000022
       2896 [main] bash (39564) C:\scoop\apps\git-with-openssh\current\usr\bin\bash.exe: *** fatal error - couldn't create signal pipe, Win32 error 5

What steps can reproduce the bug?

ask codex to run e.g. bash -lc "echo hi"

> run: bash -lc "echo hi"

• Attempting a minimal bash command to verify bash availability.

• Ran echo hi
  └       1 [main] bash (39564) cygheap_user::init: NtSetInformationToken (TokenDefaultDacl), 0xC0000022
       2896 [main] bash (39564) C:\scoop\apps\git-with-openssh\current\usr\bin\bash.exe: *** fatal error - couldn't create signal pipe, Win32 error 5

What is the expected behavior?

Executing bash script via git-bash still works.

Additional information

_No response_