#46775: tmux hangs on Yosemite -----------------------------+------------------------ Reporter: arne.schmitz@… | Owner: tessarek@… Type: defect | Status: new Priority: Normal | Milestone: Component: ports | Version: 2.3.3 Resolution: | Keywords: Port: tmux | -----------------------------+------------------------ Comment (by chris_johnsen@…): I can confirm that using `__DARWIN_VERS_1050` does offer a ''partial'' workaround for older OS X releases. The problem is that where that workaround simply stopped working on older releases, it causes significant problems on Yosemite. The scenario in question is this: 1. In a GUI session (e.g. a ''Terminal'' or ''iTerm'' window), start a fresh ''tmux'' server. 1. Observe that some special commands still work normally from inside the ''tmux'' session (i.e. the same as in a plain ''Terminal'' window): * `pbpaste` and `pbcopy` both work to access the pasteboard * `open` can open files, folders, URLs in the normal GUI-based applications * various other things: https://github.com/ChrisJohnsen/tmux-MacOSX- pasteboard/blob/master/Usage.md#beyond-pasteboard-access 1. Logout of the GUI session (while leaving the ''tmux'' server running). 1. Start a new GUI session, attach to the previously started ''tmux'' session. 1. Create a new ''tmux'' window. On previous OS X releases this would work OK, but new and existing ''tmux'' children would have lost the ability to use those “special commands” above (i.e. the `__DARWIN_VERS_1050` workaround is no longer effective at this point). On Yosemite, creating the new window in the last step hangs. The hang actually happens inside some internal GCD/XPC/Mach invocations that happen to be built into several basic library calls (e.g. getpwuid and localtime). The following backtrace was captured from running `date` in the above-described context: {{{ (lldb) pr at -p 36663 Process 36663 stopped warning: Executable module changed from "/bin/ls" to "/bin/date". (lldb) bt * thread #1: tid = 0x17a432, 0x00007fff8d2c74de libsystem_kernel.dylib`mach_msg_trap + 10, queue = 'com.apple.main- thread', stop reason = signal SIGSTOP * frame #0: 0x00007fff8d2c74de libsystem_kernel.dylib`mach_msg_trap + 10 frame #1: 0x00007fff8d2c664f libsystem_kernel.dylib`mach_msg + 55 frame #2: 0x00007fff8646627e libxpc.dylib`xpc_pipe_routine + 252 frame #3: 0x00007fff8646ee02 libxpc.dylib`_xpc_interface_routine + 163 frame #4: 0x00007fff86473c45 libxpc.dylib`bootstrap_look_up3 + 248 frame #5: 0x00007fff86473b36 libxpc.dylib`bootstrap_look_up2 + 47 frame #6: 0x00007fff8955dd2e libsystem_notify.dylib`___notify_lib_init_block_invoke + 58 frame #7: 0x00007fff8e389c13 libdispatch.dylib`_dispatch_client_callout + 8 frame #8: 0x00007fff8e389b26 libdispatch.dylib`dispatch_once_f + 117 frame #9: 0x00007fff8955a3fc libsystem_notify.dylib`_notify_lib_init + 944 frame #10: 0x00007fff8955b24c libsystem_notify.dylib`notify_register_check + 159 frame #11: 0x00007fff81d1cb9c libsystem_c.dylib`notify_register_tz + 204 frame #12: 0x00007fff81d1c6c4 libsystem_c.dylib`tzsetwall_basic + 213 frame #13: 0x00007fff81d1c880 libsystem_c.dylib`_st_tzset_basic + 363 frame #14: 0x00007fff81d1dfb0 libsystem_c.dylib`localtime + 206 frame #15: 0x000000010c5ac4b3 date`___lldb_unnamed_function13$$date + 1827 frame #16: 0x00007fff8d5625c9 libdyld.dylib`start + 1 }}} So, `__DARWIN_VERS_1050` is somewhat helpful on older releases (I just re- tested this on 10.9, but I can not currently go back any further; though I remember testing on 10.6 when I first wrote ''reattach-to-user-namespace'' almost four years ago). But `__DARWIN_VERS_1050` is harmful on Yosemite in a context that could be a quite common for ''tmux'' users (i.e. leaving a ''tmux''-based terminal session running while logging out the main GUI session). I would suggest only using `__DARWIN_VERS_1050` on pre-Yosemite releases. Yosemite seems to have its own fix for accessing the pasteboard in the above-described context, so that at least mitigates some of the problems that `__DARWIN_VERS_1050` would normally help with (pre-logout; other commands like `open` will fail post-logout, but this is arguably better than causing every child of ''tmux'' to eventually hang). -- Ticket URL: <https://trac.macports.org/ticket/46775#comment:2> MacPorts <https://www.macports.org/> Ports system for OS X

#46775: tmux hangs on Yosemite -----------------------------+------------------------ Reporter: arne.schmitz@… | Owner: tessarek@… Type: defect | Status: closed Priority: Normal | Milestone: Component: ports | Version: 2.3.3 Resolution: fixed | Keywords: Port: tmux | -----------------------------+------------------------ Changes (by jeremyhu@…): * status: new => closed * resolution: => fixed Comment: r132936 -- Ticket URL: <https://trac.macports.org/ticket/46775#comment:4> MacPorts <https://www.macports.org/> Ports system for OS X