On my macbook, I've found that sometimes it gets into a state where it cannot open up a new terminal - a blank terminal window just appears, and it hangs. Rebooting solves this, but it seems to happen again within a week or so.
Activity monitor reveals that
login is running, but it never gets to
zsh as a child process. If I leave a terminal open, this terminal is still usable.
I can open a bash terminal on a different program, and in that case the system hangs if I run
zsh, or, interestingly when I run
ls /dev/tty and hitting tab to autocomplete causes the terminal to hang and become unusable.
When these processes hang, the terminal is useless - CTRL-C does not stop them.
I suspect it is hanging on accessing /dev/ttys00*. It may be having trouble allocating a pseudo-tty? I don't think it is running out of available ptys because
w only shows one or two open.
Here is some of the output from
sample suggesting it is hanging on
Call graph: 2893 Thread_2786263 DispatchQueue_1: com.apple.main-thread (serial) 2893 start (in libdyld.dylib) + 1 [0x7fff5f9c43d5] 2893 ??? (in login) load address 0x105e34000 + 0x17b0 [0x105e357b0] 2893 ttyname (in libsystem_c.dylib) + 158 [0x7fff5fa3ba19] 2893 ttyname_r (in libsystem_c.dylib) + 146 [0x7fff5fa3baff] 2893 devname_r (in libsystem_c.dylib) + 175 [0x7fff5fa10e4d] 2893 lstat$INODE64 (in libsystem_kernel.dylib) + 10 [0x7fff5fafba0e]