#844 show command may kill you machine due to memory leak

[Alfredo Tomasini]

I found this bug on 46, but I think is on any version testcase attached to prove it follow instructions
in the README

[Giles Atkinson]

The README suggests that you already have a fix. Please post a patch file.

[Alfredo Tomasini]

yes this is the place.

https://codeberg.org/alto555/ngspice/src/branch/main/patches/0001-show-fix-memory-blow-up-dumping-source-vector-params.patch

Then, from inside their own ngspice source tree, they apply it:
git apply
0001-show-fix-memory-blow-up-dumping-source-vector-params.patch
(or patch -p1 < 0001-...patch if they don't use git either).

---

Alfredo Tomasini
www.e-td55.com/company [3]
(408) 886 1666

On 2026-07-05 06:52, Giles Atkinson wrote:

The README suggests that you already have a fix. Please post a patch
file.

---

[bugs:#844] [1] show command may kill you machine due to memory leak

Status: open
Group: v1.0 (example)
Created: Sun Jul 05, 2026 07:15 AM UTC by Alfredo Tomasini
Last Updated: Sun Jul 05, 2026 07:15 AM UTC
Owner: nobody
Attachments:

• showbug.tgz [2] (sourceforge.net) (409.6 kB;
  application/x-compressed-tar)

I found this bug on 46, but I think is on any version testcase attached
to prove it follow instructions
in the README

---

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Links:

[1] https://sourceforge.net/p/ngspice/bugs/844/
[2] https://sourceforge.net/p/ngspice/bugs/844/attachment/showbug.tgz
[3] http://www.e-td55.com/company

[Holger Vogt]

I have uploaded a fix to pre-master-47.

Needs some more testing though.

And there is another bug: all voltage types containing vector data are reported, starting with 'pulse', even if we have a 'pwl' in the test case from above, and each time all vector data (here from 'pwl') are added.

Tested with Valgrind, memory leak is removed, but above mentioned bug is still there.

[Alfredo Tomasini]

There is a patch available already. I send the link in the previous
update.

double check as always.

---

Alfredo Tomasini
www.e-td55.com/company [3]
(408) 886 1666

On 2026-07-06 01:43, Holger Vogt wrote:

I have uploaded a fix to pre-master-47.

Needs some more testing though.

[bugs:#844] [1] show command may kill you machine due to memory leak

Status: open
Group: v1.0 (example)
Created: Sun Jul 05, 2026 07:15 AM UTC by Alfredo Tomasini
Last Updated: Sun Jul 05, 2026 01:52 PM UTC
Owner: nobody
Attachments:

• showbug.tgz [2] (sourceforge.net) (409.6 kB;
  application/x-compressed-tar)

I found this bug on 46, but I think is on any version testcase attached
to prove it follow instructions
in the README

---

Sent from sourceforge.net because you indicated interest in
https://sourceforge.net/p/ngspice/bugs/844/

To unsubscribe from further messages, please visit
https://sourceforge.net/auth/subscriptions/

Links:

[1] https://sourceforge.net/p/ngspice/bugs/844/
[2] https://sourceforge.net/p/ngspice/bugs/844/attachment/showbug.tgz
[3] http://www.e-td55.com/company

[Holger Vogt]

Thanks for the input. The patch is uploaded to the development git btranch pre-master-47.