Hi,
I would like to recommend to update to current Debian stable and to see
whether the issue persists. This might be a bug that was fixd in the
mean time since Debian bookworm was released.
Greetings
Marc
On Mon, Jan 26, 2026 at 10:20:18AM +0100, Thomas Damgaard Nielsen wrote:
The atop service crashed with a segmentation fault on Debian 12.
Log snippet: atop[196073]: segfault at 8 ip 000055f29a9f4a80 sp
00007ffcba5be990 error 4 in atop[55f29a9f4000+2d000] likely on CPU 0
Code bytes: > 8b 04 25 08 00 00 00 0f 0b 0f 1f 80 00 00 00 00 41 57 41
56 41 55
The crash seems to be a NULL pointer dereference (accessing address
0x8). This occurred on a standard Debian 12 installation.
* What led up to the situation?
I use atop to monitor performance and hw utilization of my server.
I typically run atop interactively in a tmux - and I was doing this at
the time of the crash as well.
The atop service is running with default config.
* What exactly did you do (or not do) that was effective (or
ineffective)?
I did not do anything specifically. Atop was just running by itself.
Again: Default config purely as it comes from the package.
* What was the outcome of this action?
N/A.
* What outcome did you expect instead?
I expect atop to not crash with segfault.
-- System Information:
Debian Release: 12.13
APT prefers oldstable-updates
APT policy: (500, 'oldstable-updates'), (500, 'oldstable-security'), (500,
'oldstable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.1.0-42-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_DK.UTF-8, LC_CTYPE=en_DK.UTF-8 (charmap=UTF-8),
LANGUAGE=en_DK:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages atop depends on:
ii init-system-helpers 1.65.2+deb12u1
ii libc6 2.36-9+deb12u13
ii libncursesw6 6.4-4
ii libtinfo6 6.4-4
ii zlib1g 1:1.2.13.dfsg-1
Versions of packages atop recommends:
ii cron [cron-daemon] 3.0pl1-162
atop suggests no packages.
-- no debconf information
--
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Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402
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