Re: zsh hangs loading init files

[Greg Klanderman <gak@xxxxxxxxxxxxxx>]

yes, thanks.

looks like maybe HASH_DIRS logic was changed and is now stat()ing
every potential executable it finds, whereas it used to only
getdents() on all the dirs in your path.

still haven't found the changeset.

greg


>>>>> On January 5, 2012 Dan Nelson <dnelson@xxxxxxxxxxxxxxx> wrote:

> 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@xxxxxxxxxxxxxxx