From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: Problem with patch "make nlmsg_end() and genlmsg_end() void" Date: Thu, 18 Jun 2015 07:38:56 +0100 Message-ID: <1434609536.4100.78.camel@infradead.org> References: <01A82AB9-6ABD-4AD0-9CBC-628091569DB0@holtmann.org> <20150118.233722.226468667930444145.davem@davemloft.net> <1428494602.9010.11.camel@infradead.org> <1428498482.2809.10.camel@sipsolutions.net> <1433856864.19447.25.camel@infradead.org> <1433897347.27504.7.camel@edumazet-glaptop2.roam.corp.google.com> <1433982688.3907.7.camel@infradead.org> <1434060235.14843.2.camel@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-tKakfLO2+ZrWinNBTOwg" Cc: Johannes Berg , David Miller , torvalds@linux-foundation.org, marcel@holtmann.org, sfeldma@gmail.com, netdev@vger.kernel.org, teg@jklm.no To: Eric Dumazet Return-path: Received: from casper.infradead.org ([85.118.1.10]:38711 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752404AbbFRGjD (ORCPT ); Thu, 18 Jun 2015 02:39:03 -0400 In-Reply-To: <1434060235.14843.2.camel@infradead.org> Sender: netdev-owner@vger.kernel.org List-ID: --=-tKakfLO2+ZrWinNBTOwg Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2015-06-11 at 23:03 +0100, David Woodhouse wrote: > On Thu, 2015-06-11 at 01:31 +0100, David Woodhouse wrote: > > On Tue, 2015-06-09 at 17:49 -0700, Eric Dumazet wrote: > > > > I've added some debugging, and it seems that when it deadlocks,=20 > > > > glibc > > > > doesn't get *any* response to its RTM_GETADDR request. I know=20 > > > > we'd get > > > > ENOBUFS is a *response* was dropped... but what about when the=20 > > > > request > > > > itself is dropped? ...=20 > > >=20 > > > Please check that this patch fixes your issue : > > >=20 > > > http://patchwork.ozlabs.org/patch/473041/ > >=20 > > Looks likely; thanks. I'm running with that patch now. I haven't=20 > > been > > able to quickly reproduce the problem on demand, but it usually=20 > > happens > > within a day or two. So it'll be a few days at least before I call=20 > > it a > > success. >=20 > I just saw the same deadlock happen again; glibc's __check_pf() stuck > in recvmsg() waiting for a response that never comes. >=20 > This is the Fedora 22 4.0.5 kernel with the above patch applied. It did at least manage to survive a single night (which it often doesn't) if I also apply a version of this patch: https://patchwork.ozlabs.org/patch/473049/ Even on the known problematic kernels, I have been unable to reproduce this on demand using either my own threaded getaddrinfo() test program, or the one you posted here. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-tKakfLO2+ZrWinNBTOwg Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk 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