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[2a02:3100:a9c7:6b01:94ec:c77c:d65e:8d56]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6c9f6ffsm14058366f8f.1.2026.05.23.11.51.26 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 23 May 2026 11:51:26 -0700 (PDT) From: Karl Mehltretter To: Peter Zijlstra Cc: Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , Andrew Morton , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Karl Mehltretter Subject: [PATCH 0/2] lockdep/selftests: Restore PREEMPT_RT task state Date: Sat, 23 May 2026 20:51:21 +0200 Message-Id: <20260523185123.17482-1-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, the lockdep selftests deliberately run broken locking patterns. On PREEMPT_RT, some of those paths also leave task-local RT state behind, and dotest() has to restore that state before the next testcase. Patch 1 restores current->migration_disabled on all PREEMPT_RT builds. The missing restore is visible with CONFIG_SMP=n as a pinned-lock warning, "bad: scheduling from the idle thread!" and a panic after the selftests. Patch 2 restores current->sched_rt_mutex after WW-mutex selftests. Without that, stale RT-mutex scheduler state produces rt_mutex_pre_schedule() warnings in later testcases. Both changes are in dotest()'s PREEMPT_RT cleanup path in lib/locking-selftest.c. Tested on x86_64 QEMU with CONFIG_PREEMPT_RT=y, CONFIG_DEBUG_LOCKING_API_SELFTESTS=y, CONFIG_LOCKDEP=y and CONFIG_PROVE_LOCKING=y. Both CONFIG_SMP=n and CONFIG_SMP=y configurations boot to userspace without the pinned-lock panic or rt_mutex_pre_schedule() warnings. Karl Mehltretter (2): lockdep/selftests: Restore migrate_disable() state on PREEMPT_RT lockdep/selftests: Restore sched_rt_mutex state on PREEMPT_RT lib/locking-selftest.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)