Bug 2498113

Summary:	ncdu 2.10.0 crashes with "integer does not fit in destination type" when scanning certain directories
Product:	[Fedora] Fedora	Reporter:	Leandro <leandromatias.martinez>
Component:	ncdu	Assignee:	Richard Fearn <richardfearn>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	45	CC:	richardfearn
Target Milestone:	---	Keywords:	Regression, Upgrades
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	ncdu-2.11.0-1.fc43 ncdu-2.11.0-1.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-23 01:02:42 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Leandro 2026-07-08 15:21:29 UTC

ncdu 2.10.0 crashes (SIGABRT) when scanning /home/okasion and certain
subdirectories under ~/Music. The crash is a Zig panic:

  thread panic: integer does not fit in destination type

Environment
-----------
- OS: Fedora 44 (x86_64)
- Package: ncdu-2.10.0-3.fc44
- Binary: /usr/bin/ncdu (Zig-based ncdu 2.x from BratishkaErik/ncdu)

Steps to Reproduce
------------------
1. Run: ncdu /home/okasion
   → crashes during scan (DrKonqi / coredump)

Non-interactive reproduction:
2. Run: ncdu -o /dev/null /home/okasion
   → same panic, exit 134 (SIGABRT)

Narrower reproduction:
3. Run: ncdu -o /dev/null /home/okasion/Music
   → crashes

4. These Music subdirectories crash individually:
   - .../2010.07.31 House set of the Embodiment of Scarlet Devil/
   - .../2013.08.12 [SDHC-0038] 妖夢 -YOUMU- [C84]/
   - .../(C85) Alstroemeria Records — DECADE OF EXPOSE (東方) [ARCD0042] (flac+scans)/

5. In the Alstroemeria album, crash localizes to the "Scans/" subfolder
   (ASCII filenames: Obi.JPG, Booklet01.JPG, etc.)

6. Other albums with Japanese filenames scan fine, e.g.:
   .../2011.03.22 House set of ''Perfect Cherry Blossom''/
   So this does not appear to be a UTF-8 filename issue.

Expected
--------
ncdu completes the scan and shows the disk usage UI (or writes export file).

Actual
------
Process aborts with Zig panic "integer does not fit in destination type".
systemd-coredump records SIGABRT for /usr/bin/ncdu.

Additional context
------------------
- /home/okasion total size: ~138 GB
- ~/Music: ~8 GB, 375 files
- Crash appears to be an integer overflow in the Zig scanner (stack includes
  scan.Thread.run, debug.defaultPanic), not a permission or symlink issue.
- Workaround: ncdu --exclude /home/okasion/Music /home/okasion
  or use du/dust/ncdu 1.x

coredumpctl info ncdu output:
308995 files / 104.1 GiB
  #1: /home/okasion/.cache/gopls/181aec27/c6
thread 56472 panic: integer does not fit in destination type
???:?:?: 0x5595ce575728 in ??? (???)
???:?:?: 0x5595ce504782 in ??? (???)
???:?:?: 0x5595ce506825 in ??? (???)
???:?:?: 0x5595ce5018ba in ??? (???)
???:?:?: 0x7fa068ee6680 in __libc_start_call_main (/lib64/libc.so.6)
???:?:?: 0x7fa068ee6797 in __libc_start_main_alias_2 (/lib64/libc.so.6)
???:?:?: 0x5595ce5014f0 in ??? (???)
Aborted                    (core dumped) ncdu -o /dev/null /home/okasion
okasion@entropy:~/Code/golab/ozyup$ 

Reproducible: Always

Steps to Reproduce:
ncdu 2.10.0 crashes (SIGABRT) when scanning /home/okasion and certain
subdirectories under ~/Music. The crash is a Zig panic:

  thread panic: integer does not fit in destination type

Environment
-----------
- OS: Fedora 44 (x86_64)
- Package: ncdu-2.10.0-3.fc44
- Binary: /usr/bin/ncdu (Zig-based ncdu 2.x from BratishkaErik/ncdu)

Steps to Reproduce
------------------
1. Run: ncdu /home/okasion
   → crashes during scan (DrKonqi / coredump)

Non-interactive reproduction:
2. Run: ncdu -o /dev/null /home/okasion
   → same panic, exit 134 (SIGABRT)

Narrower reproduction:
3. Run: ncdu -o /dev/null /home/okasion/Music
   → crashes

4. These Music subdirectories crash individually:
   - .../2010.07.31 House set of the Embodiment of Scarlet Devil/
   - .../2013.08.12 [SDHC-0038] 妖夢 -YOUMU- [C84]/
   - .../(C85) Alstroemeria Records — DECADE OF EXPOSE (東方) [ARCD0042] (flac+scans)/

5. In the Alstroemeria album, crash localizes to the "Scans/" subfolder
   (ASCII filenames: Obi.JPG, Booklet01.JPG, etc.)

6. Other albums with Japanese filenames scan fine, e.g.:
   .../2011.03.22 House set of ''Perfect Cherry Blossom''/
   So this does not appear to be a UTF-8 filename issue.

Actual Results:
ncdu completes the scan and shows the disk usage UI (or writes export file).

Actual
------
Process aborts with Zig panic "integer does not fit in destination type".
systemd-coredump records SIGABRT for /usr/bin/ncdu.

Expected Results:
list of dirs and space used... ncdu working fine

Comment 1 Richard Fearn 2026-07-08 18:37:25 UTC

Would you be able to send me the output of:

$ strace -v ncdu -o /dev/null <folder that reproduces the issue>

as this might show some bad values being returned for some directories/files.

Comment 2 Richard Fearn 2026-07-12 14:30:28 UTC

This looks to be the same as this upstream issue:

https://github.com/BratishkaErik/ncdu/issues/3

It's fixed in 2.11.0. I'm working on packaging that version (#2497359).

Comment 3 Fedora Update System 2026-07-19 16:00:59 UTC

FEDORA-2026-38db2b11c3 (ncdu-2.11.0-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-38db2b11c3

Comment 4 Fedora Update System 2026-07-19 16:01:02 UTC

FEDORA-2026-9479d5196e (ncdu-2.11.0-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-9479d5196e

Comment 5 Fedora Update System 2026-07-20 01:38:45 UTC

FEDORA-2026-9479d5196e has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-9479d5196e`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-9479d5196e

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-07-20 01:56:02 UTC

FEDORA-2026-38db2b11c3 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-38db2b11c3`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-38db2b11c3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Richard Fearn 2026-07-22 13:01:10 UTC

I was able to reproduce the problem with ncdu 2.10.0 using the steps in https://github.com/BratishkaErik/ncdu/issues/3#issuecomment-4937620054.

The problem is fixed with 2.11.0.

Comment 8 Fedora Update System 2026-07-23 01:02:42 UTC

FEDORA-2026-38db2b11c3 (ncdu-2.11.0-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-07-23 01:19:27 UTC

FEDORA-2026-9479d5196e (ncdu-2.11.0-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.