在vintage/context/test_swap.cpp中的raw_thread函数打印浮点数时，会segmentation fault
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 30/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- cpp
- Domain
- operating-systems
Research direction
Start in vintage/context/test_swap.cpp at raw_thread and the ctx_swapcontext calls. Reproduce the crash when printf formats the float, then compare the custom context swap with the POSIX ucontext behavior and inspect the FPU environment handling noted in the issue. Done means the floating-point print returns without a segmentation fault.
Written by the indexing model from the issue text.
Description
可如下复现：
int raw_thread(voidp) {
float pi = 3.14;
printf("remote: hello %s\n", (char)p);
ctx_swapcontext(&cc, &mc);
printf("remote: back again\n");
ctx_swapcontext(&cc, &mc);
printf("remote: return, %f\n", pi);
return 1024;
}
切换为posix ucontext系列函数不会core。
从glibc源码看，都使用的FNSTENV保存FPU的环境信息；
gdb 查看，core在printf中：
movaps %xmm0, 0x50(%rsp)
- Dominant language
- Python
- Stars
- 43
- Forks
- 20
- PR merge metrics
- No merged PRs in 30d
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