From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 89F6EE77180 for ; Thu, 12 Dec 2024 19:32:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:Content-Type: References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=70YKGG4OOWXa7tuamtnJrMvy99i6WeQW73uEY1yyqNQ=; b=CHSRCKJlCzettDWcOATp8HS4Zy J3Og5ilP/FxSX6DM/PAa57mtotyrchLKkUIAtg9deVy7vXwrc64e/uwbeiCK7xJvSvbnhsHku3Cdv iL7gNKbYMDT1J0KIZpM6muqoxnHRCbANGgkhuWUz8q4pgM+UzEOcmqtOjBf5W+j9/Dk22u0OOTnnZ CAiQ2YbGvFvMvbPrwrk5aG3JrUOw5tsnpWaVS8ZyzZRhsmV0a3G/UxHmBodzHYQ8ztaBAjXGI6uzd f/mYFTk4NGZQskTSg+1siRzkJEdLF3mgx2NmPGDxH1MPj4PmnBIlhIB6QBbGHrvFti2DAMFPCwgmW hAIhxRjA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tLovV-00000001en9-38d0; Thu, 12 Dec 2024 19:32:45 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tLoiq-00000001bli-06hr for kexec@bombadil.infradead.org; Thu, 12 Dec 2024 19:19:40 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=70YKGG4OOWXa7tuamtnJrMvy99i6WeQW73uEY1yyqNQ=; b=Jh4OCSNXTAlJLtSctafAnG/oM0 Gol5oELeVn+QZR1q5h1axY6l4CQ5qPR9D6sRMd4GdVZ8uJBqLXV/rMyLbl6GU5iaWtDabKxEDrAB3 aIpCRZWN+mngUQiHO42iZSBJipiI9HG9IzR72NW/a/v0Zk7Zg8ZlrspaiNhnxVtbDExlnJu7zKjor wcHOwDtN+b2JIoqCpDO8WOYmQdGHRY7zVayXjAYmkFMsaEcr2IoI6I7+W/JHfHPeCHT6iWm6oXEHc uof6ThHqjsYZ6Fj4BfxdrRYOAvAQN6+SwAmaEXH/4FoU2nJWZa72LqcSC+usXWeyeQIvxtOgbMmry KDex1gxA==; Received: from 54-240-197-238.amazon.com ([54.240.197.238] helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tLoio-00000007bFY-0BGj; Thu, 12 Dec 2024 19:19:38 +0000 Message-ID: Subject: Re: Lockdep warnings on kexec (virtio_blk, hrtimers) From: David Woodhouse To: Thomas Gleixner , Stefan Hajnoczi , Jason Wang Cc: "x86@kernel.org" , hpa , dyoung , kexec , linux-ext4 , "Michael S. Tsirkin" , Stefano Garzarella , eperezma , Paolo Bonzini , ming.lei@redhat.com, Petr Mladek , John Ogness , Peter Zijlstra Date: Thu, 12 Dec 2024 19:19:36 +0000 In-Reply-To: <87a5d0aibc.ffs@tglx> References: <1f631458c180c975c238d4d33d333f9fa9a4d2a3.camel@infradead.org> <20241211124240.GA310916@fedora> <7717fe2ac0ce5f0a2c43fdab8b11f4483d54a2a4.camel@infradead.org> <87ldwl9g93.ffs@tglx> <10f5d22150b548ec271e0a847ba2eb91139e6f61.camel@infradead.org> <87a5d0aibc.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vkDF0f1ZNPByhTQ/0zpi" User-Agent: Evolution 3.52.3-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org --=-vkDF0f1ZNPByhTQ/0zpi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-12-12 at 19:04 +0100, Thomas Gleixner wrote: >=20 > I tried to reproduce, but failed. Do you have a simple reproducer > recipe? Build current master (231825b2e1ff here). The config I'm using is at http://david.woodhou.se/config-x86-kjump-irqs although I don't think there's anything special other than CONFIG_KEXEC_JUMP and enough lockdep to trigger the complaints. Build the test case from https://git.kernel.org/torvalds/c/07fa619f2a40c (which at some point I'll clean up and add to the kernel selftests). Then just run it repeatedly. Ten or twenty invocations should trigger it at least once. I've been running in qemu with the test case shoved into an initrd for faster testing, but it works just as well done manually. If it matters, the QEMU command line on my Haswell box is qemu-system-x86_64 -accel kvm,kernel-irqchip=3Dsplit -display none \ -serial mon:stdio -kernel arch/x86/boot/bzImage -smp 2 -m 2g \ -append "console=3DttyS0 root=3D/dev/vda1 no_console_suspend earlyprintk= =3Dserial" \ -drive file=3D/var/lib/libvirt/images/fedora.qcow2,if=3Dvirtio \ -cpu host --no-reboot -nic user,model=3Dvirtio=20 Probably the only important part of that is the no_console_suspend. A normal invocation looks like this: [root@localhost ~]# ./loadret [ 83.908243] Freezing user space processes [ 83.910587] Freezing user space processes completed (elapsed 0.001 secon= ds) [ 83.911614] OOM killer disabled. [ 83.923550] ata2: found unknown device (class 0) [ 83.938623] Disabling non-boot CPUs ... [ 83.962083] smpboot: CPU 1 is now offline [ 83.963022] crash hp: kexec_trylock() failed, kdump image may be inaccur= ate B[ 83.983498] Enabling non-boot CPUs ... [ 83.984410] crash hp: kexec_trylock() failed, kdump image may be inaccur= ate [ 83.985792] smpboot: Booting Node 0 Processor 1 APIC 0x1 [ 83.989823] CPU1 is up [ 83.999270] virtio_blk virtio1: 2/0/0 default/read/poll queues [ 84.004705] OOM killer enabled. [ 84.005299] Restarting tasks ... done. Success But sometimes it looks like this... [root@localhost ~]# ./loadret [ 84.618610] Freezing user space processes [ 84.621427] Freezing user space processes completed (elapsed 0.001 secon= ds) [ 84.622510] OOM killer disabled. [ 84.628613] ata2: found unknown device (class 0) [ 84.652758] Disabling non-boot CPUs ... [ 84.672223] smpboot: CPU 1 is now offline [ 84.673091] crash hp: kexec_trylock() failed, kdump image may be inaccur= ate B[ 84.682946] ------------[ cut here ]------------ [ 84.683584] Interrupts enabled after irqrouter_resume+0x0/0x50 --=-vkDF0f1ZNPByhTQ/0zpi Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 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