Re: [dev] [dmenu] 4.9 segfault on input

From: Jordan Timmerman <>
Date: Sun, 10 Feb 2019 17:58:40 -0600

With a little finagling, I've managed to produce a backtrace by using
Quentin's suggested flag modifications to This is attached.
It seems to me only to confirm what we've already learned: the failure
occurs in XmbLookupString. Perhaps with the additional diagnostic
information Patrick was able to provide we'll figure it out.

As an aside: thanks to everyone who has patiently helped me figure out
how to provide debugging information! Sorry I can't be more help.

On Sun, Feb 10, 2019 at 5:39 PM Patrick Smith <> wrote:
> I'm experiencing a problem that appears very similar to this one, and
> I can add a bit of information.
> Summary: When I have scim+anthy installed as an input method, the call
> to XOpenIM fails, returning a null pointer. But I don't know much
> about the internals of X, so can't be 100% sure this is the root of
> the problem. Nor do I know what to look at next.
> My environment: up to date Arch Linux, dmenu 4.9. For X input methods,
> using scim and anthy by setting environment variables:
> export GTK_IM_MODULE=scim
> export QT_IM_MODULE=scim
> To reproduce the crash, I can do
> printf 'foo\nbar' | dmenu
> and then press return. With the Arch Linux 4.9, this produces a
> segmentation fault. After I downgraded to the Arch version of dmenu
> 4.8, it works correctly.
> So I downloaded the 4.9 source code and built it myself, with no
> changes to or anything else. This version produces still
> produces the segfault.
> Then I added debugging code to print some information to stderr. From
> this, I see that the crash seems to be inside XmbLookupString, as
> reported previously; the xic pointer returned from XCreateIC and
> passed to XmbLookupString is null, and the xim pointer returned from
> XOpenIM and passed to XCreateIC is also null.
> After this, I restarted X with scim disabled by commenting out the
> exports mentioned above, and retried the printf into dmenu. Now it
> works correctly, and reports that both XOpenIM and XCreateIC return
> non-null pointers.
> I'm not sure what to look at next, so I hope that helps someone else
> to diagnose the problem...

Received on Mon Feb 11 2019 - 00:58:40 CET

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