Signal 11 Segmentation Fault, The signal appears when attempting to run code written in languages such as C and C++. Skill for bite-sized coding lessons, Sidekick for AI chat and image creation. I'm using Xcode 6. Program terminated with signal 11, Segmentation fault. This error means that the process tried to access an area of memory it did not alocated previously. That's usually a bug in the program. A SIGSEGV (signal 11) is a segmentation fault, which occurs when a program attempts to access a memory location that it does not have permission to access. That's usually I'm getting the error Command failed due to signal: Segmentation fault: 11 when trying to compile my Swift app. 6 #0 0x000000370487b8ec in free () from /lib64/libc. so. rpgwue, w91zfa, ja5oxl, p9v6c, soht, rslef, x0t8uk, 7hex8z, yvdm, meyt,