From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dl1-f73.google.com (mail-dl1-f73.google.com [74.125.82.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC9803A75B1 for ; Tue, 2 Jun 2026 06:25:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780381544; cv=none; b=IIy2Pto45VBbDtgVlTl/YyzgEQsIjPCTEr/3u1t1IdoipnHi3XU9FiVcCQXzOwGxj7AymutFolKmbvFnwm6Ezi9wNrDLQDhPAbxJISwwfnIuTJSfeKAwmeMK7MzKfZeuQJrOjOGipDSzKyj/Bcu7aQ3y1Mq+gFcRLffXM4ndxFE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780381544; c=relaxed/simple; bh=+HWu3kknbAU6zmq4lRWiOai1xYxbk6BxTlgjRcQiUOM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=bAGMwJRHnD4uzGKNkz17ctw2HPu78fzix/dIdabtTIkVm7tC8O4UpOcVpl42lK710uagBRr556adC2DnLAQgi8XowEK3BgCL6rtkXQ7Hih9xd7+MZXng3+096pd3GH1HNuz0tUh+MIYcl+blCDukP1OgL/et5VpE18EAcoGbeUM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=VuDnb/3u; arc=none smtp.client-ip=74.125.82.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="VuDnb/3u" Received: by mail-dl1-f73.google.com with SMTP id a92af1059eb24-137dd516985so3698669c88.1 for ; Mon, 01 Jun 2026 23:25:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1780381542; x=1780986342; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=EkWPJsl54oiAo7QwOctwflOU3eh1lLgDAtP7+GmkHCE=; b=VuDnb/3u4hTpBZlzHl/Paax+nkqp9sJE9qg5aNeJ8yAOw9bTlt7LfIEOcpZZb7oxjJ 6DNlBVa7hsfH2lKKtlyVNvPskbCoUEsJzETmLC2ZODvJ7DJXQYf9jO3Sl7d9NERVSQT0 /yN09O+0X7NS/pu37XkW6xzqzG9y7lQ9KoVNy/dv1Ex6QBV2dYvKrw2je7co/aNhCgX3 3m13gmqDDlQaIseBLYNlbUCyMjVMdPfch0gC97EkWoyCc5Ohu+y1iNR+cTJjNKF6B6Kl DakwzYoax+vCW+2MsqkrV7HxJsIM4e5ss085X5mTIFjOekju1J+ng9ZFzWvzk5TltJEz xpyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780381542; x=1780986342; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=EkWPJsl54oiAo7QwOctwflOU3eh1lLgDAtP7+GmkHCE=; b=nvn9ht5Xss5gMc6BPpm9VXyybLPUTYj9T4q4lpbQA7DZ1R+3t63effkszXLKJQo5L+ LLRYMKBTOesiY2ExzsAH5KIjX5XfhvT8CM6u6E17tHaxaqprrGhXwdv6aIEHSSU20YPY cj/h0z0IVW0InbYVD8R2PPps0P2uzJeYpJ1WnadmJ8698AS/7UxCz2//7yl65h+oSZtD QT+fCr6lxDQKy8LyXEG325wnIYVld6kt1jHimZYiK7A11/IffPuzxNee1INx+EAGtfum XsPLk/44wS5pch4ZsAIANJhzf8mhEy6u7cyLQN776khb72a6vZ5iOCXrH6ZVAXwprdz8 Jxfg== X-Forwarded-Encrypted: i=1; AFNElJ+7Ew1DfWeYCp/8lK5aLCLJNnawwIvBjKfSburhZa5Jqr53+S+DJYeNU/xpZuC3tBU/Lr3ur2eCCTpQ@vger.kernel.org X-Gm-Message-State: AOJu0YwyAu1gTowxP++xUVpVqlmWWtkrPK4OKcqiGtE5pQaC5gdiJ/4a dNDO5+H3NA0hs4KGRk0niAq5zuDeWA5huBtziQqOgcBWJviowBoLqzoxqQv+fIyg1VdTXEy/6qX gkDklcrH+wA== X-Received: from dlak23.prod.google.com ([2002:a05:701b:2917:b0:135:e116:73ce]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:6ba4:b0:137:eac4:82e4 with SMTP id a92af1059eb24-137eac4897amr2386077c88.17.1780381541777; Mon, 01 Jun 2026 23:25:41 -0700 (PDT) Date: Mon, 1 Jun 2026 23:24:48 -0700 In-Reply-To: <20260602062452.2583619-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260601065407.1597927-1-irogers@google.com> <20260602062452.2583619-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.929.g9b7fa37559-goog Message-ID: <20260602062452.2583619-17-irogers@google.com> Subject: [PATCH v11 16/19] perf env: Add mutex to protect lazy environment initialization From: Ian Rogers To: irogers@google.com, acme@kernel.org, namhyung@kernel.org Cc: agordeev@linux.ibm.com, gor@linux.ibm.com, hca@linux.ibm.com, jameshongleiwang@126.com, japo@linux.ibm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-s390@vger.kernel.org, sumanthk@linux.ibm.com, tmricht@linux.ibm.com Content-Type: text/plain; charset="UTF-8" Introduce a mutex to 'struct perf_env' to safely protect lazy metadata setup, such as os_release or e_machine resolution, preventing concurrent initialization data races and memory leaks during multi-threaded profiling or symbol loading. Signed-off-by: Ian Rogers --- tools/perf/util/env.c | 3 +++ tools/perf/util/env.h | 3 +++ 2 files changed, 6 insertions(+) diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 28c54c58193e..4de07cc7ef5d 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -250,6 +250,8 @@ void perf_env__exit(struct perf_env *env) { int i, j; + mutex_destroy(&env->lock); + perf_env__purge_bpf(env); perf_env__purge_cgroups(env); zfree(&env->hostname); @@ -307,6 +309,7 @@ void perf_env__init(struct perf_env *env) init_rwsem(&env->bpf_progs.lock); #endif env->kernel_is_64_bit = -1; + mutex_init(&env->lock); } static void perf_env__init_kernel_mode(struct perf_env *env) diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h index 83e74328798f..6aaf80c640bd 100644 --- a/tools/perf/util/env.h +++ b/tools/perf/util/env.h @@ -6,6 +6,7 @@ #include #include "cpumap.h" #include "rwsem.h" +#include "mutex.h" struct perf_cpu_map; @@ -156,6 +157,8 @@ struct perf_env { */ bool enabled; } clock; + /* Protects lazy environment initialization (e.g. os_release, e_machine). */ + struct mutex lock; }; enum perf_compress_type { -- 2.54.0.929.g9b7fa37559-goog