Received: (at 77613) by debbugs.gnu.org; 8 Apr 2025 14:27:05 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Apr 08 10:27:05 2025 Received: from localhost ([127.0.0.1]:34371 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1u29ur-0006fX-2p for submit <at> debbugs.gnu.org; Tue, 08 Apr 2025 10:27:05 -0400 Received: from mail-pj1-f47.google.com ([209.85.216.47]:58742) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from <meyering@HIDDEN>) id 1u29un-0006eT-9V for 77613 <at> debbugs.gnu.org; Tue, 08 Apr 2025 10:27:02 -0400 Received: by mail-pj1-f47.google.com with SMTP id 98e67ed59e1d1-2ff799d99dcso5362100a91.1 for <77613 <at> debbugs.gnu.org>; Tue, 08 Apr 2025 07:27:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744122414; x=1744727214; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=5uKS+StvrNbgSGiAltpdmB3MbGNzG9Wfq85K7GVB3L4=; b=LNNhxK95q99x80k9Ut0TEfogoqLqKPuP7MUElPVopL4ypw7n3wy5CZhtTY69u5ATJU sUFo8gE5JlNf7ClPxAYiNFIFFpBvFYnykp0fT/nPv1w3yUG68xSgh0swaT6I8d123Fy2 OELcFgZj8G+8Zh3+LUgvrdFqSSH4ITz5AftTibV/IF09eR7ZCMR1/8X5MqU0Xl2gbVPU NWqVYdDE0RS61X9TPmBO3eBMwQl4x8xVRr73X5cts8k733PZofhDnSeauMe/3qZx6U7O 5iiOiRmDBhezoM6upCsDpjt8c6C1qe4h3aUiNX17oS4MgCLtCkpsQNzZQzphUi7+YEiu UaUw== X-Gm-Message-State: AOJu0YznXuxylxFXkB97aBRHfze0DEvOtM5TeKBGSLfjd+VhZMgRkdFu oKyepPuPUf8MDsynPwlHugcDCP35PHq0DCkYexupDurvczx25THStkguzXmvN4mjSrAW5xfYQFa a4IWbCgmPVnpbH1aOO5VPdc1/+450wg== X-Gm-Gg: ASbGncu9i+RzBN2YOqoyUeQ/zgIzcTyyRupRMecJ+dAk+37u5wZ15y7fYbcXYStbiKp 3SSQj31AIQmIC/EmbiZZbXWScDSgZ7YVAcaqSasxbOOzooKwZZjv2RZtSNr0lO6ymIWn5xyeLbD PhfWBUZf6NifA+09U5SWItA3wwQwIftYfAOu0UDldaXQ== X-Google-Smtp-Source: AGHT+IHD8kUd73DsOGHzTQOOe793kReZm6Fgb23KETCCJYEYWjRFMaILa7GWSNOIXuksd+OvCVOXvItArlCwP5wSMok= X-Received: by 2002:a17:90b:51cc:b0:2fc:3264:3657 with SMTP id 98e67ed59e1d1-306a601d9e8mr28362245a91.0.1744122413734; Tue, 08 Apr 2025 07:26:53 -0700 (PDT) MIME-Version: 1.0 References: <m2r024u0pj.fsf@HIDDEN> <3353032.JoGBPyJhv8@nimes> <CA+8g5KHpk6sr1Mdsqb+71T4ZAuFz22ZjA2TY=s8f-LK=HMCeLQ@HIDDEN> <2047803.NnIJQXNAa5@nimes> In-Reply-To: <2047803.NnIJQXNAa5@nimes> From: Jim Meyering <jim@HIDDEN> Date: Tue, 8 Apr 2025 07:26:40 -0700 X-Gm-Features: ATxdqUFK-ophP1DcQJFMbDFNvUwVOS5vBCRWKYCXOiCyMFKN4NLAmgTBvNl7DRw Message-ID: <CA+8g5KGw9Tm5x2rFvv+EE+vY6=b-2yPVuZ+QTwyadf0DgMK0Lg@HIDDEN> Subject: Re: bug#77613: grep-3.11.69-a4628 on GNU/Hurd To: Bruno Haible <bruno@HIDDEN> Content-Type: multipart/mixed; boundary="000000000000eaa22906324524ea" X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 77613 Cc: 77613 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) --000000000000eaa22906324524ea Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Apr 8, 2025 at 12:54=E2=80=AFAM Bruno Haible <bruno@HIDDEN> wrot= e: > Hi Jim, > > > > So, IMO, there are two bugs: > > > > > > 1) When the allocation of the kwset takes more memory than availabl= e, > > > 'grep' should exit via xalloc_die(), instead of waiting to be ki= lled > > > by the OOM killer. > > > > > > 2) In the 'hash-collision-perf' unit test: The use of a perl primit= ive > > > for measuring the execution time of a child process, that is not > > > properly ported to GNU/Hurd. > > > > Thanks for reporting that! > > Adding a timeout should resolve this. Expect to push tomorrow: > > No, it does not resolve the problem. > > In both of my Hurd machines, with the patch, the 'hash-collision-perf' > unit test is still running after 20 minutes. > In the Hurd (32-bit) machine, a 'grep --file=3Din empty' command crashed = from > signal 6 (SIGABRT); see attached screenshot. > Both machines are unresponsive and need to be rebooted. Oh! Sorry. I made only the final invocation use the timeout. Must use it in the loop, too. Here's a better patch: --000000000000eaa22906324524ea Content-Type: application/octet-stream; name="gr-Hurd-hang.diff" Content-Disposition: attachment; filename="gr-Hurd-hang.diff" Content-Transfer-Encoding: base64 Content-ID: <f_m98lftyv0> X-Attachment-Id: f_m98lftyv0 RnJvbSA4ZDU0MTc2YzBhMzQ1OTU1ZjYzMDc3OGZhNDgyNjlkMWYzZmY3Y2E4IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBKaW0gTWV5ZXJpbmcgPG1leWVyaW5nQG1ldGEuY29tPgpEYXRl OiBNb24sIDcgQXByIDIwMjUgMjI6NDI6MjIgLTA3MDAKU3ViamVjdDogW1BBVENIXSB0ZXN0czog aGFzaC1jb2xsaXNpb24tcGVyZjogYXZvaWQgdGVzdCBoYW5nIG9uIEdOVS9IdXJkCgpUaGlzIHRl c3Qgd291bGQgaGFuZyBvbiBHTlUvSHVyZCBiZWNhdXNlIHRoZSBwZXJsIGNvZGUKd2UgdXNlIHRv IG1lYXN1cmUgc3Vic2Vjb25kIGR1cmF0aW9uIGlzbid0IHBvcnRlZCwgYW5kCnRoYXQgbG9vcCB3 b3VsZCBuZXZlciB0ZXJtaW5hdGUuCiogdGVzdHMvaGFzaC1jb2xsaXNpb24tcGVyZjogQWRkIGEg NS1zZWNvbmQgdGltZW91dC4KTm9ybWFsIHBlci1pdGVyYXRpb24gZHVyYXRpb24gaXMgMjAwbXMg b3IgbGVzcy4KUmVwb3J0ZWQgYnkgQnJ1bm8gSGFpYmxlIGluIGh0dHBzOi8vYnVncy5nbnUub3Jn Lzc3NjEzCi0tLQogdGVzdHMvaGFzaC1jb2xsaXNpb24tcGVyZiB8IDUgKysrLS0KIDEgZmlsZSBj aGFuZ2VkLCAzIGluc2VydGlvbnMoKyksIDIgZGVsZXRpb25zKC0pCgpkaWZmIC0tZ2l0IGEvdGVz dHMvaGFzaC1jb2xsaXNpb24tcGVyZiBiL3Rlc3RzL2hhc2gtY29sbGlzaW9uLXBlcmYKaW5kZXgg YjlhNWI1MS4uZDg0YjkzOSAxMDA3NTUKLS0tIGEvdGVzdHMvaGFzaC1jb2xsaXNpb24tcGVyZgor KysgYi90ZXN0cy9oYXNoLWNvbGxpc2lvbi1wZXJmCkBAIC0yMiw2ICsyMiw3IEBACiBmYWlsPTAK CiByZXF1aXJlX3BlcmxfCityZXF1aXJlX3RpbWVvdXRfCgogOiA+IGVtcHR5IHx8IGZyYW1ld29y a19mYWlsdXJlXwoKQEAgLTMxLDcgKzMyLDcgQEAgcmVxdWlyZV9wZXJsXwogbl9wYXQ9NDAwMDAK IHdoaWxlIDo7IGRvCiAgIHNlcSAkbl9wYXQgPiBpbiB8fCBmcmFtZXdvcmtfZmFpbHVyZV8KLSAg c21hbGxfbXM9JChMQ19BTEw9QyB1c2VyX3RpbWVfIDEgZ3JlcCAtLWZpbGU9aW4gZW1wdHkpIHx8 IGZhaWw9MQorICBzbWFsbF9tcz0kKExDX0FMTD1DIHVzZXJfdGltZV8gMSB0aW1lb3V0IDUgZ3Jl cCAtLWZpbGU9aW4gZW1wdHkpIHx8IGZhaWw9MQogICB0ZXN0ICRzbWFsbF9tcyAtZ2UgMjAwICYm IGJyZWFrCiAgIG5fcGF0PSQoZXhwciAkbl9wYXQgJyonIDIpCiBkb25lCkBAIC0zOSw3ICs0MCw3 IEBAIGRvbmUKICMgTm93LCBzZWFyY2ggZm9yIHRob3NlIHNhbWUgZGlnaXRzIG1hcHBlZCB0byBB LUouCiAjIFdpdGggdGhlIFBKVy1iYXNlZCBoYXNoIGZ1bmN0aW9uLCB0aGlzIGJlY2FtZSBPKE5e MikuCiBzZXEgJG5fcGF0IHwgdHIgMC05IEEtSiA+IGluIHx8IGZyYW1ld29ya19mYWlsdXJlXwot bGFyZ2VfbXM9JChMQ19BTEw9QyB1c2VyX3RpbWVfIDEgZ3JlcCAtLWZpbGU9aW4gZW1wdHkpIHx8 IGZhaWw9MQorbGFyZ2VfbXM9JChMQ19BTEw9QyB1c2VyX3RpbWVfIDEgdGltZW91dCA1IGdyZXAg LS1maWxlPWluIGVtcHR5KSB8fCBmYWlsPTEKCiAjIERlbGliZXJhdGVseSByZWNvcmRpbmcgaW4g YW4gdW51c2VkIHZhcmlhYmxlIHNvIGl0CiAjIHNob3dzIHVwIGluIHNldCAteCBvdXRwdXQsIGlu IGNhc2UgdGhpcyB0ZXN0IGZhaWxzLgotLSAKMi40OS4wLjE1NC5nOWQyMmFjNTEyMgoK --000000000000eaa22906324524ea--
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From: Bruno Haible <bruno@HIDDEN>
To: Jim Meyering <jim@HIDDEN>
Subject: Re: bug#77613: grep-3.11.69-a4628 on GNU/Hurd
Date: Tue, 08 Apr 2025 09:54:33 +0200
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Hi Jim,
> > So, IMO, there are two bugs:
> >
> > 1) When the allocation of the kwset takes more memory than available,
> > 'grep' should exit via xalloc_die(), instead of waiting to be killed
> > by the OOM killer.
> >
> > 2) In the 'hash-collision-perf' unit test: The use of a perl primitive
> > for measuring the execution time of a child process, that is not
> > properly ported to GNU/Hurd.
>
> Thanks for reporting that!
> Adding a timeout should resolve this. Expect to push tomorrow:
No, it does not resolve the problem.
In both of my Hurd machines, with the patch, the 'hash-collision-perf'
unit test is still running after 20 minutes.
In the Hurd (32-bit) machine, a 'grep --file=in empty' command crashed from
signal 6 (SIGABRT); see attached screenshot.
Both machines are unresponsive and need to be rebooted.
--nextPart2114479.o4kTbAZ4gJ
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--nextPart2114479.o4kTbAZ4gJ--
bug-grep@HIDDEN:bug#77613; Package grep.
Full text available.Received: (at 77613) by debbugs.gnu.org; 8 Apr 2025 05:48:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Apr 08 01:48:06 2025 Received: from localhost ([127.0.0.1]:58333 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1u21oc-0000sU-EE for submit <at> debbugs.gnu.org; Tue, 08 Apr 2025 01:48:06 -0400 Received: from mail-pg1-f177.google.com ([209.85.215.177]:51419) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from <meyering@HIDDEN>) id 1u21oa-0000rk-GO for 77613 <at> debbugs.gnu.org; Tue, 08 Apr 2025 01:48:05 -0400 Received: by mail-pg1-f177.google.com with SMTP id 41be03b00d2f7-af93cd64ef3so3377791a12.2 for <77613 <at> debbugs.gnu.org>; Mon, 07 Apr 2025 22:48:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744091278; x=1744696078; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=tmzf+43Qhudd4QvkpWivtFvpGgki/uwMh1WdTbfbwpk=; b=gzP+Dsv1mvaCpwK//CpgwWbCerSDx+JDPPRzrkDn9aPqfRBJ4NrG0lZJGdXK17E8UO YfId50Xf9ynkrc9s5ee6tQ8u3Y0EnNN2tHs7fPJFp6iI1Wh2N8Gpb/Kh9gqHGjM2hLFE mUv3Gfn7CK1PCyMT1V7p4qtg9WiwmunexOh82DMqHBsQdv2HmQ0JVnT40nK6NYTjilXS WUgTw0LPjCtQPMD2IvlyZ28QhE8ax36M+RiUgYf6qK1TdnXms1OMB+0nZBSllwIAic39 JyMCYuFrbKNsF1s7WWtpijYMq135JulaF1C/nknH1QcJAY8lGUDkLqlpeDEUiAA6CKSN dhwg== X-Gm-Message-State: AOJu0Yyc0DTx0Qx0NxrdN3hpOacxHABp3+ipcQLOx9G1TL9nzwvcgwT5 5dBtKIiDSM9RwZiH3JbUxD42axv4nFSp4MUzG2eXTKQtAvH+bGAKGT0RBIli+dgG9/IE8v7/Zmq xhzMON2r3rmZyIeP9A/PpMzsQDM4= X-Gm-Gg: ASbGncsrff4xWHa0oWHuOEXAfMyy6CrwAkn2a6SIWV+QgJDkT5w2S/ERBdHsr1SfpRu g3YBpcKPYah82HvpvYIJf4VjAyuE2mMNxB1hD6R/6SqiwxMA7kttQ9zO92jutsW3uG2vDv/PZdX 5DxGW0z7l4V9GK2/VRKUAowYu6uK53ZYW6SPHEKXRjfA== X-Google-Smtp-Source: AGHT+IH6i3VSnoEy6KJxblpJUo4IpTV4FNfCusGGf07WgKHmEZcUq8w2vDs/AouqYsLxHtPB9RTuD53T5ftUbjofXAA= X-Received: by 2002:a17:90b:5150:b0:2ea:37b4:5373 with SMTP id 98e67ed59e1d1-306a485efd9mr22246721a91.10.1744091278283; Mon, 07 Apr 2025 22:47:58 -0700 (PDT) MIME-Version: 1.0 References: <m2r024u0pj.fsf@HIDDEN> <3353032.JoGBPyJhv8@nimes> In-Reply-To: <3353032.JoGBPyJhv8@nimes> From: Jim Meyering <jim@HIDDEN> Date: Mon, 7 Apr 2025 22:47:45 -0700 X-Gm-Features: ATxdqUGv3VjV-SoGSP0-pdcORq2CNVKgmKcvYX4vhf08JeRoLBZWYle-HU7WzDk Message-ID: <CA+8g5KHpk6sr1Mdsqb+71T4ZAuFz22ZjA2TY=s8f-LK=HMCeLQ@HIDDEN> Subject: Re: bug#77613: grep-3.11.69-a4628 on GNU/Hurd To: Bruno Haible <bruno@HIDDEN> Content-Type: multipart/mixed; boundary="0000000000001965f706323de57b" X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 77613 Cc: 77613 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) --0000000000001965f706323de57b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Apr 7, 2025 at 10:34=E2=80=AFAM Bruno Haible via Bug reports for GN= U grep <bug-grep@HIDDEN> wrote: > On > - GNU/Hurd x86_64 from 2024, > - GNU/Hurd i386 from 2023, > I see a test hang: hash-collision-perf. > > On GNU/Hurd x86_64: > > When I interrupted the build, the file 'in' has 5120000 lines, and > find attached the log file of this test. As you can see, the value of > small_ms stays 0 even for larger files. > > By running > $ date; LC_ALL=3DC ../../src/grep --file=3Din empty; date > I can see that the execution times grow like this: > 640000 0.3 sec > 1280000 0.9 sec > 2560000 1.5 sec > 5120000 > 60 sec > > On GNU/Hurd i386, it's similar. Here it's when the file 'in' has > 40960000 lines, that the grep execution hangs. Find attached the > last stack trace I was able to obtain before it hung. > > Regardless how much RAM I give to the machine, there will always > be a point where "grep --file=3Din empty" will take more RAM than > available, and (since Hurd does not have an OOM killer) the machine > then hangs. > > IMO, the correct behaviour would be that 'grep' exits via xalloc_die(), > not that it hangs. > > Whereas on GNU/Linux (in a machine that has the same amount of RAM as > the GNU/Hurd machine): > > $ : > empty > $ seq 640000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty > real 0.44s > $ seq 1280000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty > real 0.99s > $ seq 2560000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty > real 2.22s > $ seq 5120000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty > real 4.84s > $ seq 10240000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty > real 24.19s > $ seq 20480000 > in; LC_ALL=3DC time ./src/grep --file=3Din empty > Killed > real 24.40s > > Here it was the OOM killer that saved the machine from hanging. > > So, IMO, there are two bugs: > > 1) When the allocation of the kwset takes more memory than available, > 'grep' should exit via xalloc_die(), instead of waiting to be killed > by the OOM killer. > > 2) In the 'hash-collision-perf' unit test: The use of a perl primitive > for measuring the execution time of a child process, that is not > properly ported to GNU/Hurd. Thanks for reporting that! Adding a timeout should resolve this. Expect to push tomorrow: --0000000000001965f706323de57b Content-Type: application/octet-stream; name="gr-Hurd-hang.diff" Content-Disposition: attachment; filename="gr-Hurd-hang.diff" Content-Transfer-Encoding: base64 Content-ID: <f_m982vqjh0> X-Attachment-Id: f_m982vqjh0 RnJvbSAwNzRmODFhMjBjNjNiM2I3YTM4NzczZjExNjBkZGM3MjM3Y2E3NWE0IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBKaW0gTWV5ZXJpbmcgPG1leWVyaW5nQG1ldGEuY29tPgpEYXRl OiBNb24sIDcgQXByIDIwMjUgMjI6NDI6MjIgLTA3MDAKU3ViamVjdDogW1BBVENIXSB0ZXN0czog aGFzaC1jb2xsaXNpb24tcGVyZjogYXZvaWQgdGVzdCBoYW5nIG9uIEdOVS9IdXJkCgpUaGlzIHRl c3Qgd291bGQgaGFuZyBvbiBHTlUvSHVyZCBiZWNhdXNlIHRoZSBwZXJsIGNvZGUKd2UgdXNlIHRv IG1lYXN1cmUgc3Vic2Vjb25kIGR1cmF0aW9uIGlzbid0IHBvcnRlZCwgYW5kCnRoYXQgbG9vcCB3 b3VsZCBuZXZlciB0ZXJtaW5hdGUuCiogdGVzdHMvaGFzaC1jb2xsaXNpb24tcGVyZjogQWRkIGEg NS1zZWNvbmQgdGltZW91dC4KTm9ybWFsIHBlci1pdGVyYXRpb24gZHVyYXRpb24gaXMgMjAwbXMg b3IgbGVzcy4KUmVwb3J0ZWQgYnkgQnJ1bm8gSGFpYmxlIGluIGh0dHBzOi8vYnVncy5nbnUub3Jn Lzc3NjEzCi0tLQogdGVzdHMvaGFzaC1jb2xsaXNpb24tcGVyZiB8IDMgKystCiAxIGZpbGUgY2hh bmdlZCwgMiBpbnNlcnRpb25zKCspLCAxIGRlbGV0aW9uKC0pCgpkaWZmIC0tZ2l0IGEvdGVzdHMv aGFzaC1jb2xsaXNpb24tcGVyZiBiL3Rlc3RzL2hhc2gtY29sbGlzaW9uLXBlcmYKaW5kZXggYjlh NWI1MS4uMTdlYzZmNyAxMDA3NTUKLS0tIGEvdGVzdHMvaGFzaC1jb2xsaXNpb24tcGVyZgorKysg Yi90ZXN0cy9oYXNoLWNvbGxpc2lvbi1wZXJmCkBAIC0yMiw2ICsyMiw3IEBACiBmYWlsPTAKCiBy ZXF1aXJlX3BlcmxfCityZXF1aXJlX3RpbWVvdXRfCgogOiA+IGVtcHR5IHx8IGZyYW1ld29ya19m YWlsdXJlXwoKQEAgLTM5LDcgKzQwLDcgQEAgZG9uZQogIyBOb3csIHNlYXJjaCBmb3IgdGhvc2Ug c2FtZSBkaWdpdHMgbWFwcGVkIHRvIEEtSi4KICMgV2l0aCB0aGUgUEpXLWJhc2VkIGhhc2ggZnVu Y3Rpb24sIHRoaXMgYmVjYW1lIE8oTl4yKS4KIHNlcSAkbl9wYXQgfCB0ciAwLTkgQS1KID4gaW4g fHwgZnJhbWV3b3JrX2ZhaWx1cmVfCi1sYXJnZV9tcz0kKExDX0FMTD1DIHVzZXJfdGltZV8gMSBn cmVwIC0tZmlsZT1pbiBlbXB0eSkgfHwgZmFpbD0xCitsYXJnZV9tcz0kKExDX0FMTD1DIHVzZXJf dGltZV8gMSB0aW1lb3V0IDUgZ3JlcCAtLWZpbGU9aW4gZW1wdHkpIHx8IGZhaWw9MQoKICMgRGVs aWJlcmF0ZWx5IHJlY29yZGluZyBpbiBhbiB1bnVzZWQgdmFyaWFibGUgc28gaXQKICMgc2hvd3Mg dXAgaW4gc2V0IC14IG91dHB1dCwgaW4gY2FzZSB0aGlzIHRlc3QgZmFpbHMuCi0tIAoyLjQ5LjAu MTU0Lmc5ZDIyYWM1MTIyCgo= --0000000000001965f706323de57b--
bug-grep@HIDDEN:bug#77613; Package grep.
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From: Bruno Haible <bruno@HIDDEN>
To: bug-grep@HIDDEN
Subject: Re: grep-3.11.69-a4628 on GNU/Hurd
Date: Mon, 07 Apr 2025 19:33:00 +0200
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--nextPart2434568.3c9HiEOlIg
Content-Transfer-Encoding: 7Bit
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On
- GNU/Hurd x86_64 from 2024,
- GNU/Hurd i386 from 2023,
I see a test hang: hash-collision-perf.
On GNU/Hurd x86_64:
When I interrupted the build, the file 'in' has 5120000 lines, and
find attached the log file of this test. As you can see, the value of
small_ms stays 0 even for larger files.
By running
$ date; LC_ALL=C ../../src/grep --file=in empty; date
I can see that the execution times grow like this:
640000 0.3 sec
1280000 0.9 sec
2560000 1.5 sec
5120000 > 60 sec
On GNU/Hurd i386, it's similar. Here it's when the file 'in' has
40960000 lines, that the grep execution hangs. Find attached the
last stack trace I was able to obtain before it hung.
Regardless how much RAM I give to the machine, there will always
be a point where "grep --file=in empty" will take more RAM than
available, and (since Hurd does not have an OOM killer) the machine
then hangs.
IMO, the correct behaviour would be that 'grep' exits via xalloc_die(),
not that it hangs.
Whereas on GNU/Linux (in a machine that has the same amount of RAM as
the GNU/Hurd machine):
$ : > empty
$ seq 640000 > in; LC_ALL=C time ./src/grep --file=in empty
real 0.44s
$ seq 1280000 > in; LC_ALL=C time ./src/grep --file=in empty
real 0.99s
$ seq 2560000 > in; LC_ALL=C time ./src/grep --file=in empty
real 2.22s
$ seq 5120000 > in; LC_ALL=C time ./src/grep --file=in empty
real 4.84s
$ seq 10240000 > in; LC_ALL=C time ./src/grep --file=in empty
real 24.19s
$ seq 20480000 > in; LC_ALL=C time ./src/grep --file=in empty
Killed
real 24.40s
Here it was the OOM killer that saved the machine from hanging.
So, IMO, there are two bugs:
1) When the allocation of the kwset takes more memory than available,
'grep' should exit via xalloc_die(), instead of waiting to be killed
by the OOM killer.
2) In the 'hash-collision-perf' unit test: The use of a perl primitive
for measuring the execution time of a child process, that is not
properly ported to GNU/Hurd.
Bruno
--nextPart2434568.3c9HiEOlIg
Content-Disposition: attachment; filename="hash-collision-perf.log"
Content-Transfer-Encoding: 7Bit
Content-Type: text/x-log; charset="x-UTF_8J"; name="hash-collision-perf.log"
++ initial_cwd_=/home/bruno/grep-3.11.69-a4628/build/tests
+++ testdir_prefix_
+++ printf gt
++ pfx_=gt
+++ mktempd_ /home/bruno/grep-3.11.69-a4628/build/tests gt-hash-collision-perf.XXXX
+++ case $# in
+++ destdir_=/home/bruno/grep-3.11.69-a4628/build/tests
+++ template_=gt-hash-collision-perf.XXXX
+++ MAX_TRIES_=4
+++ case $destdir_ in
+++ destdir_slash_=/home/bruno/grep-3.11.69-a4628/build/tests/
+++ case $template_ in
++++ unset TMPDIR
+++ d=/home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
+++ case $d in
+++ :
+++ test -d /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
++++ ls -dgo /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
+++ perms='drwx------ 2 4096 Apr 7 15:55 /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE'
+++ case $perms in
+++ :
+++ echo /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
+++ return
++ test_dir_=/home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
++ cd /home/bruno/grep-3.11.69-a4628/build/tests/gt-hash-collision-perf.bCSE
++ case $srcdir in
++ srcdir=../../../tests
++ builddir=..
++ export srcdir builddir
++ gl_init_sh_nl_='
'
++ IFS='
'
++ for sig_ in 1 2 3 13 15
+++ expr 1 + 128
++ eval 'trap '\''Exit 129'\'' 1'
+++ trap 'Exit 129' 1
++ for sig_ in 1 2 3 13 15
+++ expr 2 + 128
++ eval 'trap '\''Exit 130'\'' 2'
+++ trap 'Exit 130' 2
++ for sig_ in 1 2 3 13 15
+++ expr 3 + 128
++ eval 'trap '\''Exit 131'\'' 3'
+++ trap 'Exit 131' 3
++ for sig_ in 1 2 3 13 15
+++ expr 13 + 128
++ eval 'trap '\''Exit 141'\'' 13'
+++ trap 'Exit 141' 13
++ for sig_ in 1 2 3 13 15
+++ expr 15 + 128
++ eval 'trap '\''Exit 143'\'' 15'
+++ trap 'Exit 143' 15
++ saved_IFS='
'
++ IFS=:
++ new_PATH=
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ test -d /home/bruno/grep-3.11.69-a4628/build/src/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ test -d /usr/local/bin/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ test -d /usr/bin/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ test -d /bin/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ test -d /usr/local/games/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games
++ for dir in $PATH
++ IFS='
'
++ case "$dir" in
++ test -d /usr/games/.
++ new_PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
++ IFS='
'
++ PATH=/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
++ export PATH
++ trap remove_tmp_ EXIT
+ path_prepend_ ../src
+ test 1 '!=' 0
+ path_dir_=../src
+ case $path_dir_ in
+ abs_path_dir_=/home/bruno/grep-3.11.69-a4628/build/tests/../src
+ case $abs_path_dir_ in
+ PATH=/home/bruno/grep-3.11.69-a4628/build/tests/../src:/home/bruno/grep-3.11.69-a4628/build/src:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
+ create_exe_shims_ /home/bruno/grep-3.11.69-a4628/build/tests/../src
+ case $EXEEXT in
+ return 0
+ shift
+ test 0 '!=' 0
+ export PATH
+ fail=0
+ require_perl_
+ test perl
+ perl -e 'use warnings'
+ :
+ n_pat=40000
+ :
+ seq 40000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 40000 '*' 2
+ n_pat=80000
+ :
+ seq 80000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 80000 '*' 2
+ n_pat=160000
+ :
+ seq 160000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 160000 '*' 2
+ n_pat=320000
+ :
+ seq 320000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 320000 '*' 2
+ n_pat=640000
+ :
+ seq 640000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 640000 '*' 2
+ n_pat=1280000
+ :
+ seq 1280000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 1280000 '*' 2
+ n_pat=2560000
+ :
+ seq 2560000
++ LC_ALL=C
++ user_time_ 1 grep --file=in empty
++ perl -le '
my $expected_exit_status = $ARGV[0];
shift @ARGV;
system (@ARGV);
my ($user, $system, $child_user, $child_system) = times;
my $me = q(hash-collision-perf);
$? == -1
and die qq($me: failed to exec ") . join (" ", @ARGV) . qq(": $!\n);
my $rc = $?;
my $sig = ($rc & 127);
$sig and die "$me: child died with signal $sig\n";
$rc >>= 8;
$rc == $expected_exit_status
or die "$me: bad exit status: expected $expected_exit_status; got $rc\n";
# Print milliseconds of child user time.
$child_user *= 1000;
print int ($child_user + 0.5)' 1 grep --file=in empty
+ small_ms=0
+ test 0 -ge 200
++ expr 2560000 '*' 2
+ n_pat=5120000
+ :
+ seq 5120000
--nextPart2434568.3c9HiEOlIg
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--nextPart2434568.3c9HiEOlIg--
Bruno Haible <bruno@HIDDEN>:bug-grep@HIDDEN.
Full text available.bug-grep@HIDDEN:bug#77613; Package grep.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.