_Originally created by @kytv on [#8707 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/8707)_ When the test suite is run a socket is created in */tmp/.X11-unix/X\[0-9\]*, but this socket is not cleaned up upon $feature’s completion. This prevents the test suite from starting on the 10th run. Stracing the process shows wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13072 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13073 stat("/tmp/.X10-lock", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/tmp/.X11-unix/X10", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/usr/local/sbin/sleep", 0x7fffac0e6630) = -1 ENOENT (No such file or directory) stat("/usr/local/bin/sleep", 0x7fffac0e6630) = -1 ENOENT (No such file or directory) stat("/usr/sbin/sleep", 0x7fffac0e6630) = -1 ENOENT (No such file or directory) stat("/usr/bin/sleep", 0x7fffac0e6630) = -1 ENOENT (No such file or directory) stat("/sbin/sleep", 0x7fffac0e6630) = -1 ENOENT (No such file or directory) stat("/bin/sleep", {st_mode=S_IFREG|0755, st_size=31136, ...}) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13074 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0, NULL) = 13073 --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigreturn(0x11) = 13073 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13074 --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigreturn(0x11) = 13074 stat("/tmp/.X10-lock", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/tmp/.X11-unix/X10", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13075 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13075 --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigreturn(0x11) = 13075 stat("/tmp/.X10-lock", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/tmp/.X11-unix/X10", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13076 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13076 --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigreturn(0x11) = 13076 stat("/tmp/.X10-lock", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/tmp/.X11-unix/X10", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13077 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13077 --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigreturn(0x11) = 13077 stat("/tmp/.X10-lock", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/tmp/.X11-unix/X10", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13078 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13078 --- SIGCHLD (Child exited) @ 0 (0) --- rt_sigreturn(0x11) = 13078 stat("/tmp/.X10-lock", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) stat("/tmp/.X11-unix/X10", 0x7fffac0e62b0) = -1 ENOENT (No such file or directory) clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fbcf606a9d0) = 13079 # ls -l /tmp/.X11-unix/ total 0 srwxrwxrwx 1 root root 0 Jan 15 17:56 X0 srwxrwxrwx 1 root root 0 Jan 15 20:30 X1 srwxrwxrwx 1 root root 0 Jan 15 20:49 X2 srwxrwxrwx 1 root root 0 Jan 15 21:04 X3 srwxrwxrwx 1 root root 0 Jan 15 21:26 X4 srwxrwxrwx 1 root root 0 Jan 15 23:43 X5 srwxrwxrwx 1 root root 0 Jan 16 00:36 X6 srwxrwxrwx 1 root root 0 Jan 16 02:30 X7 srwxrwxrwx 1 root root 0 Jan 16 08:33 X8 srwxrwxrwx 1 root root 0 Jan 16 10:02 X9 For now, I can work around this by clearing out */tmp/.X11-unix/* in my test VM. Feature Branch: bugfix/8707-properly-clean-up-xvfb Parent Task: tails/tails#8539 ### Related issues - **Related to** tails/tails#8947 - **Related to** tails/tails#9139