Bugs/panics in default arch linux programs

[arihant2math]

Missing syscalls/crashes in coreutils programs and various other bits in the default arch linux image. Feel free to edit. Sorted by approximate usage.

• /sbin/init: Systemd blockers #190
• ls -la: llxattr (Implement xattr syscalls #138). Then name_to_handle_at and then statfs. Fixed by Fix gnu coreutils ls -la #157.
• ls /bin | grep trace: mincore (Implement sys_mincore #160, grep pipe fixes #177).
• echo "dev" | cat: cat: -: Bad file descriptor (grep pipe fixes #177)
• ls proc/ls dev fails (any ls call onto a different mount seems to fail) Fixed by Distinguish between file permissions and file mode #244
• echo "hi" >> test.txt. Fixed by Implement F_DUPFD for sys_fcntl #151.
• vi: Visual needs addressible cursor or upline capability can be fixed by export TERM="xterm-256color", although it looks weird.
• more: signalfd4
• pacman: eventfd2
• top: Instantly exits, need more procfs implementation.
• lsattr: statfs Fix gnu coreutils ls -la #157 fixes crashes but causes "lsattr: Operation not supported While reading flags on ..."
• xtrace: After Execute scripts #149 needs DUP_FD. Fixed by Implement F_DUPFD for sys_fcntl #151. Note that running xtrace on a program is still broken.
• zstdmt: clone3