[bpf-ci-bot] Remove stale `map_kptr` entry from CI DENYLIST

[kernel-patches-review-bot]

Summary

The map_kptr test has been denylisted in the BPF CI DENYLIST configurations
since early 2026 due to two separate failures. Both underlying issues have been
fixed by commits that are already in the current tree, but the DENYLIST entries
were never removed. The test should be re-enabled.

Failure Details

• Test / Component: map_kptr (serial_test_map_kptr in prog_tests/map_kptr.c)
• Frequency: Denylisted — 0% of CI runs execute this test currently
• Failure mode: Two distinct failures, both now fixed
• Affected architectures: All (x86_64 confirmed, aarch64 confirmed in fix commit)
• CI DENYLIST locations:
  • kernel-patches/vmtest: ci/vmtest/configs/DENYLIST line 3
  • libbpf/ci: ci/vmtest/configs/DENYLIST line 4

Root Cause Analysis

Two separate issues caused map_kptr to fail:

Issue 1: RCU Tasks Trace kprobe breakage (fixed 2026-02-11)

Commit c27cea4416a3 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast")
removed the function that map_kptr was kprobing to synchronize RCU Tasks Trace
grace periods. The test's kern_sync_rcu_tasks_trace() helper relied on a kprobe
that no longer had a target.

Fix: Commit 2669dde7a8c6 ("selftests/bpf: Fix map_kptr grace period wait")
replaced the kprobe-based approach with a new kfunc
bpf_kfunc_call_test_call_rcu_tasks_trace() in bpf_testmod that directly invokes
call_rcu_tasks_trace() and signals completion via a shared variable.

Issue 2: queue_work race on map free (fixed 2026-01-15)

wait_for_map_release() was using kern_sync_rcu() to wait for map freeing, but
the queue_work(system_dfl_wq, &map->work) in bpf_map_free_in_work() could
take longer than the RCU grace period, causing test_map_kptr_ref1 to see stale
reference counts (retval error 2).

Fix: Commit efad162f5a84 ("selftests/bpf: Fix map_kptr test failure") added a
count_ref BPF program and wait_for_map_release() that polls until the
reference count drops to 2, rather than relying on a single kern_sync_rcu()
call.

Both fixes are confirmed present in the current tree:

• 2669dde7a8c6 (2026-02-11): tools/testing/selftests/bpf/progs/rcu_tasks_trace_gp.c,
  tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
• efad162f5a84 (2026-01-15): tools/testing/selftests/bpf/prog_tests/map_kptr.c,
  tools/testing/selftests/bpf/progs/map_kptr.c

Proposed Fix

Remove the map_kptr line from both CI DENYLIST files:

• kernel-patches/vmtest: ci/vmtest/configs/DENYLIST
• libbpf/ci: ci/vmtest/configs/DENYLIST

No in-tree kernel changes needed — the test code is already fixed.

Impact

The map_kptr test exercises critical BPF functionality:

• kptr reference counting in BPF maps (array, hash, LRU, percpu variants)
• kptr operations in local storage maps (task, cgroup, inode, sk)
• kptr in map-in-map configurations
• Proper cleanup of kptr references on map free

With the test denylisted, regressions in any of these areas would go undetected
by CI.

References

• Fix commit 1: https://git.kernel.org/bpf/bpf/c/2669dde7a8c6 ("selftests/bpf: Fix map_kptr grace period wait")
• Fix commit 2: https://git.kernel.org/bpf/bpf/c/efad162f5a84 ("selftests/bpf: Fix map_kptr test failure")
• Root cause commit: https://git.kernel.org/torvalds/c/c27cea4416a3 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast")
• Lore thread: https://lore.kernel.org/r/20260211185747.3630539-1-memxor@gmail.com
• Lore thread: https://lore.kernel.org/bpf/20260116052245.3692405-1-yonghong.song@linux.dev

[kernel-patches-review-bot]

0001-ci-Remove-stale-map_kptr-from-DENYLIST.patch

From: BPF CI Bot <bot+bpf-ci@kernel.org>
Subject: [PATCH] ci: Remove stale map_kptr from DENYLIST

The map_kptr test was denylisted due to two failures that have both
been fixed upstream:

1. Commit 2669dde7a8c6 ("selftests/bpf: Fix map_kptr grace period
   wait") fixed the RCU Tasks Trace kprobe breakage caused by the
   reimplementation of RCU Tasks Trace via SRCU-fast.

2. Commit efad162f5a84 ("selftests/bpf: Fix map_kptr test failure")
   fixed a race condition where queue_work for map free could take
   longer than the expected RCU grace period.

Both commits are in the current tree. Remove the stale DENYLIST entry
to re-enable this important kptr reference counting test.

Generated-by: BPF CI Bot (claude-opus-4-6) <bot+bpf-ci@kernel.org>
---

This patch applies to both kernel-patches/vmtest and libbpf/ci repositories.

--- a/ci/vmtest/configs/DENYLIST
+++ b/ci/vmtest/configs/DENYLIST
@@ -1,3 +1,2 @@
 verif_scale_pyperf600
 sockmap_basic/sockmap udp multi channels
-map_kptr