This bug was fixed in the package lttng-modules - 2.14.0-1ubuntu1
---------------
lttng-modules (2.14.0-1ubuntu1) questing; urgency=medium
* Support Linux 6.17 (LP: #2122419)
- repurpose-__percpu-tag-as-a-named-address-space-qualifier.patch
- remove-the-for_reclaim-field-from-struct-writeback_control.patch
lttng-modules (2.14.0-1) unstable; urgency=medium
[ Andreas Beckmann ]
* [e4aad43] Fix version constraint for building lttng-probe-9p
* [a3159c8] dkms.conf: Set BUILD_EXCLUSIVE_KERNEL_MIN="3.5"
[ Michael Jeanson ]
* [1c1be3a] New upstream version 2.14.0
* [8e16fa1] Refresh upstream signing key
* [e2cbe7a] Refresh patches
* [a579cc2] Bump standards to 4.7.2
* [c328b79] Update git url in upstream metadata
* [d3cd6d0] d/control: update description
* [8068856] Update dkms config
* [b22d162] Update debian/copyright
* [4be4523] Add config check for 9p probe in dkms config
* [f41cf63] d/copyright: add missing license text for CC-BY-SA-4.0
* [d7fcfa9] Move to debhelper 13
* [425602d] d/copyright: remove old FSF address
-- Massimiliano Pellizzer <massimiliano.pelliz...@canonical.com> Tue,
09 Sep 2025 10:20:33 +0200
** Changed in: lttng-modules (Ubuntu Questing)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2122419
Title:
lttng-modules FTBFS in Questing with kernel 6.17
Status in lttng-modules package in Ubuntu:
Fix Released
Status in lttng-modules source package in Questing:
Fix Released
Bug description:
[ Impact ]
lttng-modules does not compile from source in Questing with kernel
6.17:
src/../include/ringbuffer/frontend_api.h: In function
‘lib_ring_buffer_reserve’:
/usr/src/linux-headers-6.17.0-3-generic/include/linux/percpu-defs.h:220:45:
error: initialization from pointer to non-enclosed address space
220 | const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;
\
| ^
/usr/src/linux-headers-6.17.0-3-generic/include/linux/percpu-defs.h:238:9:
note: in expansion of macro ‘__verify_pcpu_ptr’
238 | __verify_pcpu_ptr(ptr);
\
| ^~~~~~~~~~~~~~~~~
src/../include/ringbuffer/frontend_api.h:155:23: note: in expansion of macro
‘per_cpu_ptr’
155 | buf = per_cpu_ptr(chan->backend.buf,
ctx->priv.reserve_cpu);
| ^~~~~~~~~~~
[ Fix ]
Rebase the package on the current Debian version (2.14.0-1) and
patch the code to properly support Linux 6.17 by applying the following
commits from upstream:
- f86e2417 fix: percpu: repurpose __percpu tag as a named address space
qualifier (v6.15)
- 49403039 fix: mm: remove the for_reclaim field from struct
writeback_control (v6.17)
[ Test Plan ]
Build the dkms correctly on Questing:
$ sudo apt install -y lttng-modules-dkms
$ dkms status
lttng-modules/2.14.0, 6.17.0-3-generic, x86_64: installed
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