* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
@ 2014-04-11 21:48 ` lberk at redhat dot com
2014-04-14 15:54 ` tromey at redhat dot com
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: lberk at redhat dot com @ 2014-04-11 21:48 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
Lukas Berk <lberk at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lberk at redhat dot com,
| |mjw at redhat dot com
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
2014-04-11 21:48 ` [Bug runtime/16836] " lberk at redhat dot com
@ 2014-04-14 15:54 ` tromey at redhat dot com
2014-04-14 20:09 ` lberk at redhat dot com
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: tromey at redhat dot com @ 2014-04-14 15:54 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
Tom Tromey <tromey at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at redhat dot com
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
2014-04-11 21:48 ` [Bug runtime/16836] " lberk at redhat dot com
2014-04-14 15:54 ` tromey at redhat dot com
@ 2014-04-14 20:09 ` lberk at redhat dot com
2017-10-11 10:44 ` mark at klomp dot org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: lberk at redhat dot com @ 2014-04-14 20:09 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
--- Comment #1 from Lukas Berk <lberk at redhat dot com> ---
I reran the script this morning on 3.15.0-rc0.git9.1.fc21.x86_64 and
3.15.0-0.rc0.git12.1.fc21.x86_64. The warning was present on both rawhide
kernels for me.
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
` (2 preceding siblings ...)
2014-04-14 20:09 ` lberk at redhat dot com
@ 2017-10-11 10:44 ` mark at klomp dot org
2017-10-11 10:48 ` mjw at fedoraproject dot org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: mark at klomp dot org @ 2017-10-11 10:44 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mark at klomp dot org
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
` (3 preceding siblings ...)
2017-10-11 10:44 ` mark at klomp dot org
@ 2017-10-11 10:48 ` mjw at fedoraproject dot org
2020-10-05 23:15 ` barrdetwix at gmail dot com
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: mjw at fedoraproject dot org @ 2017-10-11 10:48 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
Mark Wielaard <mjw at fedoraproject dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|mjw at fedoraproject dot org |
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
` (4 preceding siblings ...)
2017-10-11 10:48 ` mjw at fedoraproject dot org
@ 2020-10-05 23:15 ` barrdetwix at gmail dot com
2020-10-06 0:18 ` fche at redhat dot com
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: barrdetwix at gmail dot com @ 2020-10-05 23:15 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
barrdetwix at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |barrdetwix at gmail dot com
--- Comment #2 from barrdetwix at gmail dot com ---
Hit the same issue today on a freshly built v5.8.12 with SystemTap master
(effa3dbe13fa).
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
` (5 preceding siblings ...)
2020-10-05 23:15 ` barrdetwix at gmail dot com
@ 2020-10-06 0:18 ` fche at redhat dot com
2020-10-06 1:42 ` barrdetwix at gmail dot com
2020-10-06 12:04 ` mark at klomp dot org
8 siblings, 0 replies; 10+ messages in thread
From: fche at redhat dot com @ 2020-10-06 0:18 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fche at redhat dot com
--- Comment #3 from Frank Ch. Eigler <fche at redhat dot com> ---
I believe stack -underflow- can only occur if the DWARF CFI data is invalid, or
if we interpret it in an incorrect manner. It'd really help to extract that
somehow. Or try running with
stap -DDEBUG_UNWIND=2 [...]
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
` (6 preceding siblings ...)
2020-10-06 0:18 ` fche at redhat dot com
@ 2020-10-06 1:42 ` barrdetwix at gmail dot com
2020-10-06 12:04 ` mark at klomp dot org
8 siblings, 0 replies; 10+ messages in thread
From: barrdetwix at gmail dot com @ 2020-10-06 1:42 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
--- Comment #4 from barrdetwix at gmail dot com ---
Here's 200kB of log with -DDEBUG_UNWIND=2 leading up to the "DWARF expression
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 running
stap directly, my reproducer is a small tool that starts a target process
suspended, generates a stap script for that process, and captures stap output.
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.
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug runtime/16836] CFI expression underflow occurs during unwinding on some kernels
2014-04-11 21:48 [Bug runtime/16836] New: CFI expression underflow occurs during unwinding on some kernels lberk at redhat dot com
` (7 preceding siblings ...)
2020-10-06 1:42 ` barrdetwix at gmail dot com
@ 2020-10-06 12:04 ` mark at klomp dot org
8 siblings, 0 replies; 10+ messages in thread
From: mark at klomp dot org @ 2020-10-06 12:04 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=16836
--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
Unfortunately this warning can only show up during expression parsing and we
would have to know which expression operation is being evaluated. Which stap
only shows with -DDEBUG_UNWIND=3 which will generate even more output...
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 10+ messages in thread