Why is the use of alloca() not considered good practice?

Why is the use of alloca() not considered good practice?

c stack malloc allocation alloca

c

Freaky way of allocating two-dimensional array?

c arrays multidimensional-array malloc allocation

c

Determine size of dynamically allocated memory in C

c memory dynamic size allocation

c

Getting a stack overflow exception when declaring a large array

c arrays memory stack allocation

c

Why is there no "recalloc" in the C standard?

c malloc allocation realloc calloc

c