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From: "barrdetwix at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/16836] CFI expression underflow occurs during unwinding
 on some kernels
Date: Tue, 06 Oct 2020 01:42:48 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D16836

--- Comment #4 from barrdetwix at gmail dot com ---
Here's 200kB of log with -DDEBUG_UNWIND=3D2 leading up to the "DWARF expres=
sion
stack underflow in CFI": https://paste.mozilla.org/VewSs2i7#L8,258,3146

(Note that there's a couple non-stap lines in the long becase I'm not runni=
ng
stap directly, my reproducer is a small tool that starts a target process
suspended, generates a stap script for that process, and captures stap outp=
ut.
And so far the CFI underflow problem reproduces perfectly only when I run my
tool under itself.)

Happy to upload vmlinux or some other binary if that would help any.

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