[30.x] Backports #34459

1. 
   fanquake commented at 11:55 am on January 30, 2026: member

   Backports:

   • #34409
   • #34434
   • #34445
   • #34453
   • #34461
   • #34510
2. test: use ModuleNotFoundError in interface_ipc.py

   Change this so we catch the case where the capnp shared libs have been
   updated, and can no-longer be loaded by the Python module, resulting in
   a skipped test, even though pycapnp is installed. i.e:
   ```bash
   stderr:
   Traceback (most recent call last):
     File "/root/ci_scratch/build/test/functional/interface_ipc.py", line 20, in <module>
       import capnp  # type: ignore[import] # noqa: F401
       ^^^^^^^^^^^^
     File "/usr/local/lib64/python3.14/site-packages/capnp/__init__.py", line 36, in <module>
       from .version import version as __version__
     File "/usr/local/lib64/python3.14/site-packages/capnp/version.py", line 1, in <module>
       from .lib.capnp import _CAPNP_VERSION_MAJOR as LIBCAPNP_VERSION_MAJOR  # noqa: F401
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ImportError: libcapnpc.so.1.0.1: cannot open shared object file: No such file or directory
   ```
   
   Failing in this way should make it clear that `pycapnp` needs to be
   reinstalled/rebuilt.
   
   If  `pycapnp` is not installed, the test still skips as expected:
   ```bash
   Remaining jobs: [interface_ipc.py]
   1/1 - interface_ipc.py skipped (capnp module not available.)
   
   TEST             | STATUS    | DURATION
   
   interface_ipc.py | ○ Skipped | 0 s
   ```
   
   Fixes: #34016.
   
   Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
   
   Github-Pull: #34409
   Rebased-From: 905dfdee86d679f8ea31d841bceb77a5724a6b1b

   19b3e2e50e
3. miniscript: correct and_v() properties

   and_v() must never be 'd'. This is not a bug fix since this was
   unreachable in valid Miniscripts: the first sub of an and_v() must be of
   type V, which conflicts with (i.e. never has) property 'd'.
   
   Github-Pull: #34434
   Rebased-From: 4fab35cf88c048d2784fe6d71d3f83cc4e420879

   48749cf4c7
4. fuzz: Use `__AFL_SHM_ID` for naming test directories

   Use the AFL++ shared memory ID environment variable to create
   a deterministic datadir path. This prevents accumulation of stale
   directories after a fuzz iteration crashes or times out. During
   long fuzz campaigns, this accumulation has occasionally resulted
   in running out of disk space.
   
   Github-Pull: #34445
   Rebased-From: d3e681bc06758fe0686cd96fcfd4a1c4c5af62b4

   0a768d4a5a
5. ci: Always print low ccache hit rate notice

   Github-Pull: #34453
   Rebased-From: fad2876ec330dbb833905d3b2ee5753abc3bc3af

   7317a0ba1f
6. fanquake added this to the milestone 30.3 on Jan 30, 2026
7. DrahtBot added the label Backport on Jan 30, 2026
8. 
   DrahtBot commented at 11:56 am on January 30, 2026: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Reviews

   See the guideline for information on the review process. A summary of reviews will appear here.

9. fanquake force-pushed on Feb 2, 2026
10. ci: [refactor] Allow overwriting check option in run helper

    Also, use str(e) consistently in all run helpers.
    
    This refactor does not change any behavior.
    
    This can be reviewed by checking that all instances are exactly
    identical code now:
    $ git grep --function-context 'def run(cmd'
    
    Github-Pull: #34461
    Rebased-From: 2222dadabbbd03be9b4b917583fd51b34857f40c

    f5d4dc9419
11. fanquake force-pushed on Feb 3, 2026
12. ci: Print verbose build error message in test-each-commit

    Github-Pull: #34461
    Rebased-From: bbbb78a4f28fd2378342398ccae60995ae0e08d2

    1a757af7ea
13. fanquake force-pushed on Feb 3, 2026
14. doc: fix broken bpftrace installation link

    The bpftrace project moved from iovisor/bpftrace to bpftrace/bpftraceand
    removed the separate INSTALL.md file. Installation instructionsare now
    in the README.md Quick Start section.
    
    Github-Pull: #34510
    Rebased-From: 42ee31e80c99bdb4d6affdc9dc22a0f3d5da7b59

    b7a182c749
15. doc: update release notes for v30.x 2ded49b34e
16. fanquake force-pushed on Feb 9, 2026

Contributors
fanquake DrahtBot

Labels
Backport

Milestone
30.3