On Mon, Jul 18, 2005 at 10:47:29AM +0100, Peter Stephenson wrote:
> Alexey Tourbin wrote:
> > [test@solemn test]$ zsh -cx 'HOSTNAME=3D`/bin/hostname`'
> > +/etc/zshenv:9> [ -f /etc/profile.d/tmpdir.sh ']'
> > +/etc/zshenv:9> . /etc/profile.d/tmpdir.sh
> > +/etc/profile.d/tmpdir.sh:3> [ -z /home/test/tmp ']'
> > +/etc/profile.d/tmpdir.sh:3> [ ! -d /home/test/tmp ']'
> > +/etc/zshenv:10> TMPPREFIX=3D/home/test/tmp/zsh
> > +zsh:1> HOSTNAME=3D+zsh:1> /bin/hostname
> > [... zsh hangs ...]
> 
> So it looks like it's independent of startup files:  are you able to
> confirm this?  Does it still happen after a rebuild from scratch?

I do build from scratch (but I have ccache).
Here is strace log for HOSTNAME=`/bin/hostname`:

[pid  3629] uname({sys="Linux", node="solemn.turbinal.org", ...}) = 0
[pid  3629] fstat64(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
[pid  3629] mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4002a000
[pid  3629] write(1, "solemn.turbinal.org\n", 20) = 20
[pid  3629] munmap(0x4002a000, 4096)    = 0
[pid  3629] exit_group(0)               = ?
fcntl64(12, F_GETFL)                    = 0 (flags O_RDONLY)
fstat64(12, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x401ca000
_llseek(12, 0, 0xbffff324, SEEK_CUR)    = -1 ESPIPE (Illegal seek)
read(12, "solemn.turbinal.org\n", 4096) = 20
read(12, "", 4096)                      = 0
close(12)                               = 0
munmap(0x401ca000, 4096)                = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
kill(3629, SIG_0)                       = 0
rt_sigprocmask(SIG_SETMASK, ~[HUP INT CHLD], [CHLD], 8) = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, ~[], ~[HUP INT KILL STOP], 8) = 0
rt_sigprocmask(SIG_SETMASK, ~[HUP INT KILL STOP], ~[KILL STOP], 8) = 0
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WNOHANG|WSTOPPED, {ru_utime={0, 10000}, ru_stime={0, 0}, ...}) = 3629
getrusage(RUSAGE_CHILDREN, {ru_utime={0, 10000}, ru_stime={0, 0}, ...}) = 0
wait4(-1, 0xbfffece0, WNOHANG|WSTOPPED, 0xbfffece4) = -1 ECHILD (No child processes)
sigreturn()                             = ? (mask now ~[HUP INT KILL CHLD STOP])
pause(