Re: zsh hangs loading init files

[Dan Nelson <dnelson@allantgroup.com>]

In the last episode (Jan 05), Greg Klanderman said:
> 
> Hi all,
> 
> I'm in the process of transitioning my work computer from debian 5.0
> (lenny) to an Ubuntu variant that Google uses (Goobuntu) and having
> trouble with newer versions of zsh.  While loading my init files, zsh
> hangs several times for 10-30 sec.  This is not happening on 4.3.10
> which came with the Goobuntu distribution, or a 4.3.10 which I built
> from source, but is occurring with 4.3.15 and a cvs checkout in
> between 4.3.11 and 4.3.12 which I built.  I do not see the problem on
> my old debian box.
> 
> By putting in some print statements, the first hang seems to occur
> at a command substitution
> 
> | case "$(uname -s)" in
> |   ...
> 
> the last bit of strace up to the hang is:
> 
> pipe([3, 4])                            = 0
> fcntl(3, F_DUPFD, 10)                   = 13
> close(3)                                = 0
> fcntl(4, F_DUPFD, 10)                   = 14
> close(4)                                = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
> clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f88402d89d0) = 26368
> close(14)                               = 0
> fcntl(13, F_GETFL)                      = 0 (flags O_RDONLY)
> fstat(13, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f88402de000
> lseek(13, 0, SEEK_CUR)                  = -1 ESPIPE (Illegal seek)
> read(13, ######## hangs here for 10-30 sec then continues

zsh isn't hanging; it's just waiting for the output of its forked child
process (uname).  Try adding "-f" to your strace commandline, to follow
child processes.
 
-- 
	Dan Nelson
	dnelson@allantgroup.com