Infinite recursion when parsing circular -r references in multiple requirements.txt #15650
Description
Summary
Definitely just an edge case but came across this when I inadvertently setup a requirements.txt and requirements-dev.txt file with circular references.
requirements.txt
# Main production dependencies
requests
# Include development requirements
-r requirements-dev.txt
requirements-dev.txt
# Development-specific dependencies
pytest
# Include main requirements
-r requirements.txt
uv pip install -r requirements.txt
Expected Behavior
I would expect uv to detect the circular dependency, issue a warning (e.g., "Skipping circular inclusion of requirements.txt"), and gracefully stop parsing the recursive include rather than crashing.
Actual Behavior
uv crashes with a stack overflow error.
~\uv-recursion-bug via 🐍 v3.13.7 (uv-recursion-bug)
❯ $env:RUST_BACKTRACE=1; uv pip install -r requirements.txt --verbose
DEBUG uv 0.8.14 (af856fb88 2025-08-28)
thread 'main2' has overflowed its stack
error: unhandled exception in uv, please report a bug:
code 0xC00000FD at address 0x7ff6ac0a0c28
EXCEPTION_STACK_OVERFLOW
rax=000005a78e013120 rbx=0000000000000069 rcx=000005a78e61c170
rdx=000005a78e61c170 rsi=0000000000000069 rdi=000005a78e61c170
rsp=0000000d840065f0 rbp=0000000d84006670 r8=000005a78e410400
r9=0000000000000069 r10=00007ff6acbc0560 r11=0000000000000001
r12=0000000000000020 r13=000000000000001f r14=0000000000000020
r15=000005a78e410400 rip=00007ff6ac0a0c28 eflags=0000000000010216
stack backtrace:
Platform
Microsoft Windows 11 Enterprise 10.0.26100 64-bit
Version
uv 0.8.14 (af856fb 2025-08-28)
Python version
Python 3.13.7