From debbugs-submit-bounces@debbugs.gnu.org Thu Aug 28 03:23:21 2025 Received: (at submit) by debbugs.gnu.org; 28 Aug 2025 07:23:21 +0000 Received: from localhost ([127.0.0.1]:38130 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1urWye-0006X4-F4 for submit@debbugs.gnu.org; Thu, 28 Aug 2025 03:23:20 -0400 Received: from lists.gnu.org ([2001:470:142::17]:50870) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1urWNg-0000nL-Vo for submit@debbugs.gnu.org; Thu, 28 Aug 2025 02:45:09 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1urWNb-0005zo-9U for bug-coreutils@gnu.org; Thu, 28 Aug 2025 02:45:03 -0400 Received: from mail-pj1-x1042.google.com ([2607:f8b0:4864:20::1042]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1urWNZ-00073h-JG for bug-coreutils@gnu.org; Thu, 28 Aug 2025 02:45:03 -0400 Received: by mail-pj1-x1042.google.com with SMTP id 98e67ed59e1d1-32326e202e0so552446a91.2 for ; Wed, 27 Aug 2025 23:45:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1756363499; x=1756968299; darn=gnu.org; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date:message-id:reply-to; bh=YaptIWZNEZ4cADo7BdZYEsy6Qm9OeswMA0zQEFOXo20=; b=chmXBtLuuSluM12PsnfaVP0soJFR73oOIiU2cc0LrHwCq6fFGE4JXOS4alVtg0SbJl m+ChSj4QnaYPwAI97bn6SscPB31eIQnFq7k4J7N3CIb/TNH42T5w8U3An2DaUXRJSODK gMJu/z8sw20YuA6g4FkdaHEtnbE/KCOtRMCt3O3ANdXmD4I9QjKw0yJUb3l1zh1DYSPa 0PQsQD0qBlObnhrglJwR1CC130PsC7yBk4dJes9iNQjK3gP5hYafe2JWPZtwsY1lDtS0 Jk9w+0RZ0tXz7qvLvQ3KyWs013eXAkILKSr+7dfyAxMby2Z7nfz2pfWi5ikbgRM2rFjr 5m1w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756363499; x=1756968299; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=YaptIWZNEZ4cADo7BdZYEsy6Qm9OeswMA0zQEFOXo20=; b=Evs0VEdJjLwEU8iEH46hZ/CwqNJpl8EnAnbkpt1CC3U/3f0R5wiGxwwh7kG1LYNlun SR2bcKYILCfQ2OigT9UPnCV3Rfj5cAAcS7S0i+Ybu4pPZS/SoZh6o4zOlno0jUVC+3a6 gNfOIOEYA1nh4FB0+YJNI4ZBxmTHxOyj1/C6FvuAy1eFgL42VuXPxCAZWTw+ArOyD3pt WzvH0QRhsh1tCoh8pJjftfwCPJXlQtXhIG/BZGM5gHYixsfg2FUKfDcochQwYSMMqBmU kEb9uCRj3chmXF5pfd6IJZuDgI/aAiJIM5FijLTEgHViz2HoqndwrLZPeKbs8Lnx1bJS 374A== X-Gm-Message-State: AOJu0Yxlqv1RHsJw/w/W84fahXIC7iQ3lfMAi2sUuLHhZXX1hz98NFBU pCvzGxnfLfADeCBJhKPTRX5P9NocqNIreRCxK61zirvVf5niSSam10WhRE4s4hnKkCJ/aJ4MC4X LOlPLYzKU9EmpqaFC/Zvotd0t7QwtSHK0U6qD2/M= X-Gm-Gg: ASbGncu6oTWPGgWayWWLP3lHmsmaSxdamSFo5PKrwF4eQFUuEMnGoE+OdFadGgphhZi 9i1+RSqQM1CBAG8KfDVQHw8taukBqzlP6eIICYzGwzJetwFKA1B72uNEBjMxLyCTflQB12wN2E+ uXR6HDNx7q2COEQGflP38OQUEf9Msr7wvlcr4mQ2w0m3VyUD6Q24o/NKD6cxhcSg5cN2Fk73p1V 7ewOkBG/A== X-Google-Smtp-Source: AGHT+IHzwbCMbYqsGm1QKyCLnXczJbRV8PmcY9sKPlakQaZ6EZIVyJGNHOnABT0jdxRGmoHY/DzoObB+Uo3gFanBpYo= X-Received: by 2002:a17:90b:2752:b0:325:1548:f0f with SMTP id 98e67ed59e1d1-32515ee0104mr28017314a91.14.1756363498859; Wed, 27 Aug 2025 23:44:58 -0700 (PDT) MIME-Version: 1.0 From: yubiao hu Date: Thu, 28 Aug 2025 14:44:45 +0800 X-Gm-Features: Ac12FXwp5DjoI2l7_FRoW3ZmB-C4BYSv93Alt_oxeBZe6_PFrbqXtMYezf7HwqM Message-ID: Subject: expr: memory not freed before program exit(memory leak) To: bug-coreutils@gnu.org Content-Type: multipart/alternative; boundary="00000000000072320d063d673e9e" Received-SPF: pass client-ip=2607:f8b0:4864:20::1042; envelope-from=huyubiaox@gmail.com; helo=mail-pj1-x1042.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Thu, 28 Aug 2025 03:23:19 -0400 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.0 (/) --00000000000072320d063d673e9e Content-Type: text/plain; charset="UTF-8" Package: coreutils Version: 9.4 Severity: normal I was trying to build coreutils with ASan, and found a memory leak in expr. When running: expr length "hello" Output: ================================================================= ==755058==ERROR: LeakSanitizer: detected memory leaks Direct leak of 24 byte(s) in 1 object(s) allocated from: #0 0xffff7f7a2524 in __interceptor_malloc ../../../../libsanitizer/asan/asan_malloc_linux.cpp:69 #1 0xaaaacd31f4c8 in xmalloc ../lib/xmalloc.c:45 #2 0xaaaacd2a0dd4 in int_value ../src/expr.c:369 #3 0xaaaacd2a0dd4 in eval6 ../src/expr.c:714 #4 0xaaaacd2a0dd4 in eval6 ../src/expr.c:694 #5 0xaaaacd2a4f44 in eval5 ../src/expr.c:786 #6 0xaaaacd2a5320 in eval4 ../src/expr.c:817 #7 0xaaaacd2a595c in eval3 ../src/expr.c:856 #8 0xaaaacd2a5dbc in eval2 ../src/expr.c:886 #9 0xaaaacd2a72e0 in eval1 ../src/expr.c:965 #10 0xaaaacd2a7874 in eval ../src/expr.c:996 #11 0xaaaacd29d3e0 in main ../src/expr.c:352 --00000000000072320d063d673e9e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Package: coreutils
Version: 9.4
Severity: normal
=
I was trying to build coreutils with ASan, and found a memory leak in e= xpr.

When running:
=C2=A0expr length "hello"

Out= put:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D755058=3D= =3DERROR: LeakSanitizer: detected memory leaks

Direct leak of 24 byt= e(s) in 1 object(s) allocated from:
=C2=A0 =C2=A0 #0 0xffff7f7a2524 in _= _interceptor_malloc ../../../../libsanitizer/asan/asan_malloc_linux.cpp:69<= br>=C2=A0 =C2=A0 #1 0xaaaacd31f4c8 in xmalloc ../lib/xmalloc.c:45
=C2=A0= =C2=A0 #2 0xaaaacd2a0dd4 in int_value ../src/expr.c:369
=C2=A0 =C2=A0 #= 3 0xaaaacd2a0dd4 in eval6 ../src/expr.c:714
=C2=A0 =C2=A0 #4 0xaaaacd2a0= dd4 in eval6 ../src/expr.c:694
=C2=A0 =C2=A0 #5 0xaaaacd2a4f44 in eval5 = ../src/expr.c:786
=C2=A0 =C2=A0 #6 0xaaaacd2a5320 in eval4 ../src/expr.c= :817
=C2=A0 =C2=A0 #7 0xaaaacd2a595c in eval3 ../src/expr.c:856
=C2= =A0 =C2=A0 #8 0xaaaacd2a5dbc in eval2 ../src/expr.c:886
=C2=A0 =C2=A0 #9= 0xaaaacd2a72e0 in eval1 ../src/expr.c:965
=C2=A0 =C2=A0 #10 0xaaaacd2a7= 874 in eval ../src/expr.c:996
=C2=A0 =C2=A0 #11 0xaaaacd29d3e0 in main .= ./src/expr.c:352
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Thu, 28 Aug 2025 01:08:36 -0700 (PDT) Received: from XTHCYRY1WD-Collin-Funk ([2601:646:8081:3770:4c28:e3d6:3df0:b9b3]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b49cb891cc9sm13388126a12.10.2025.08.28.01.08.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Aug 2025 01:08:36 -0700 (PDT) From: Collin Funk To: yubiao hu Subject: Re: bug#79328: expr: memory not freed before program exit(memory leak) In-Reply-To: (yubiao hu's message of "Thu, 28 Aug 2025 14:44:45 +0800") References: Date: Thu, 28 Aug 2025 01:08:35 -0700 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.3 (/) X-Debbugs-Envelope-To: 79328 Cc: 79328@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) Hi, yubiao hu writes: > Package: coreutils > Version: 9.4 > Severity: normal > > I was trying to build coreutils with ASan, and found a memory leak in expr. > > When running: > expr length "hello" > > Output: > ================================================================= > ==755058==ERROR: LeakSanitizer: detected memory leaks > > Direct leak of 24 byte(s) in 1 object(s) allocated from: > #0 0xffff7f7a2524 in __interceptor_malloc > ../../../../libsanitizer/asan/asan_malloc_linux.cpp:69 > #1 0xaaaacd31f4c8 in xmalloc ../lib/xmalloc.c:45 > #2 0xaaaacd2a0dd4 in int_value ../src/expr.c:369 > #3 0xaaaacd2a0dd4 in eval6 ../src/expr.c:714 > #4 0xaaaacd2a0dd4 in eval6 ../src/expr.c:694 > #5 0xaaaacd2a4f44 in eval5 ../src/expr.c:786 > #6 0xaaaacd2a5320 in eval4 ../src/expr.c:817 > #7 0xaaaacd2a595c in eval3 ../src/expr.c:856 > #8 0xaaaacd2a5dbc in eval2 ../src/expr.c:886 > #9 0xaaaacd2a72e0 in eval1 ../src/expr.c:965 > #10 0xaaaacd2a7874 in eval ../src/expr.c:996 > #11 0xaaaacd29d3e0 in main ../src/expr.c:352 I recommend running the following in your shell before testing with address sanitizer: $ export ASAN_OPTIONS="detect_leaks=0 Most (all?) of the programs in Coreutils will not free memory before exit, since it just takes extra time for no benefit. Also, I expect most other GNU programs to behave this way. Since it is the behavior recommended in the GNU Coding Standards [1]. Thanks, Collin [1] https://www.gnu.org/prep/standards/standards.html#Memory-Usage From debbugs-submit-bounces@debbugs.gnu.org Thu Aug 28 09:48:37 2025 Received: (at 79328) by debbugs.gnu.org; 28 Aug 2025 13:48:37 +0000 Received: from localhost ([127.0.0.1]:38932 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1urczU-0000CS-NO for submit@debbugs.gnu.org; Thu, 28 Aug 2025 09:48:37 -0400 Received: from mail.cs.ucla.edu ([131.179.128.66]:49528) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1urczQ-0000Ar-Qd for 79328@debbugs.gnu.org; Thu, 28 Aug 2025 09:48:34 -0400 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 101BA3C0149F6; Thu, 28 Aug 2025 06:48:26 -0700 (PDT) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id SLuRT9KGvakI; Thu, 28 Aug 2025 06:48:26 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id DCCEE3C32B0FC; Thu, 28 Aug 2025 06:48:25 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu DCCEE3C32B0FC DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1756388905; bh=yQZyyODL+1Sfa9yU5378d5khwu5An2zPW2M17cEJ+/E=; h=Message-ID:Date:MIME-Version:To:From; b=jJn7c/OGaPwXOXtuAclZJMzS0/E59Gc1IHrTJE/F3QgswV7AcSNV4g99V+dblZmth wpFMbQ2r/07V65YgH5onLJUBejCiJs9ii4aYCoKUSOifynls9h+M+RL6xwcOB6B+8v NCX9uU3JzDZncTPDGW5aD1Y+/5bgU/m609gptSCcA0uXG32l+24YhTmo/hsu0ZjSqi MGa3ghszhLzqh33nVBJ6qqrvVWpzpmcykXWA03iwPLwdKeLrqa5DW9+EqOrxZVMiUG wKKfIsygGDTYcJNs9e7efMIKSQYEMata6Xu6Kz4l7ePe3oa/sn7dPEtGAa/S4iKmMn Hc4abh9MSYUyA== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id ZPL8gpnLtTXm; Thu, 28 Aug 2025 06:48:25 -0700 (PDT) Received: from penguin.cs.ucla.edu (47-154-18-19.fdr01.snmn.ca.ip.frontiernet.net [47.154.18.19]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id BF16C3C0149F6; Thu, 28 Aug 2025 06:48:25 -0700 (PDT) Message-ID: Date: Thu, 28 Aug 2025 06:48:24 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: bug#79328: expr: memory not freed before program exit(memory leak) To: Collin Funk , yubiao hu References: Content-Language: en-US From: Paul Eggert Organization: UCLA Computer Science Department In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 79328 Cc: 79328@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.0 (-) On 2025-08-28 01:08, Collin Funk wrote: > Most (all?) of the programs in Coreutils will not free memory before > exit, since it just takes extra time for no benefit. Not only does it take extra time (and sometimes even space!), it makes the programs slightly less reliable because if there are bugs elsewhere the calls to 'free' can have undefined behavior. And this makes for more maintenance burden, since developers therefore have to verify that these other bugs cannot occur. The idea that programmers ought to carefully free everything just before exit, merely to pacify a leak sanitizer, is misguided and counterproductive. 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Thu, 28 Aug 2025 07:03:24 -0700 (PDT) Message-ID: Date: Thu, 28 Aug 2025 07:03:24 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: control@debbugs.gnu.org From: Paul Eggert Subject: 79328 is not a bug Organization: UCLA Computer Science Department Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.0 (-) tags 79328 notabug close 79328 From debbugs-submit-bounces@debbugs.gnu.org Thu Aug 28 22:33:59 2025 Received: (at control) by debbugs.gnu.org; 29 Aug 2025 02:33:59 +0000 Received: from localhost ([127.0.0.1]:40990 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1urowA-0006SM-Lp for submit@debbugs.gnu.org; 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Thu, 28 Aug 2025 19:33:38 -0700 (PDT) Received: from fedora ([2601:646:8081:3770::a299]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-24903705defsm9197765ad.27.2025.08.28.19.33.38 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Aug 2025 19:33:38 -0700 (PDT) From: Collin Funk To: control@debbugs.gnu.org Subject: 79331 is a duplicate. Date: Thu, 28 Aug 2025 19:33:37 -0700 Message-ID: <87ecsuyhz2.fsf@gmail.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.3 (/) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.7 (/) merge 79331 79328 thanks Collin