Ooops, one other diagnostic detail I neglected to include is that the
"grep" used under fish is a fish function:
~ ❯❯❯ type grep
grep is a function with definition
function grep
command grep --color=auto $argv
end
This is necessary to reproduce the hang:
~ ❯❯❯ ./a.out | /usr/bin/grep 'a'
~ ❯❯❯ ./a.out | grep 'a'
<hang>
Thanks.
Alex
On Fri, Apr 21, 2017 at 12:29 PM, Alex Gaynor <[email protected]> wrote:
> Hi Readline Maintainers!
>
> This email describes a bug that occurs when readline is used in
> combination with the fish shell.
>
> Initial diagnostic info:
>
> readline 7.0.3, install with homebrew
> macOS 10.12.4
> Darwin agaynor-44227 16.5.0 Darwin Kernel Version 16.5.0: Fri Mar 3
> 16:52:33 PST 2017; root:xnu-3789.51.2~3/RELEASE_X86_64 x86_64
> fish, version 2.5.0
>
> Ok, now to reproduce the bug:
>
> ~ ❯❯❯ cat t.c
> #include <readline/readline.h>
>
> int main() {
> rl_initialize();
> return 0;
> }
> ~ ❯❯❯ # Use the readline from homebrew, rather than the system one
> ~ ❯❯❯ clang -L /usr/local/opt/readline/lib/ -lreadline t.c
> ~ ❯❯❯ ./a.out | grep hi
> <hangs here>
>
>
> This works fine with the libEdit provided by macOS:
>
> ~ ❯❯❯ clang -lreadline t.c
> ~ ❯❯❯ ./a.out | grep hi
> ~ ❯❯❯
>
> It similarly works fine under bash.
>
> Grabbing the process with lldb, shows it is hung in the following place:
>
> * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
> * frame #0: 0x00007fffa48b55ee libsystem_kernel.dylib`__ioctl + 10
> frame #1: 0x00007fffa48b1569 libsystem_kernel.dylib`ioctl + 159
> frame #2: 0x000000010eb7a362 libreadline.7.dylib`get_tty_settings + 54
> frame #3: 0x000000010eb7a584
> libreadline.7.dylib`rltty_set_default_bindings
> + 57
> frame #4: 0x000000010eb74a79 libreadline.7.dylib`rl_initialize + 200
> frame #5: 0x000000010eb6ff84 a.out`main + 20
> frame #6: 0x00007fffa4787235 libdyld.dylib`start + 1
> frame #7: 0x00007fffa4787235 libdyld.dylib`start + 1
>
>
>
> I have not gotten further than this. It was a tossup between filing as a
> fish bug and a readline bug, the fact that libEdit works was what caused me
> to file this as a readline bug.
>
> Thanks, let me know if there's anything additional I can do to help debug.
>
> Thanks,
> Alex
>
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