linux-kernel - Re: [patch V2 00/46] x86, PCI, XEN, genirq ...: Prepare for device MSI

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Message-ID: <87tuvltpo5.fsf@nanos.tec.linutronix.de>
Date:   Sat, 26 Sep 2020 01:14:18 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>, Qian Cai <cai@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-next@...r.kernel.org, x86@...nel.org,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Wei Liu <wei.liu@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Steve Wahl <steve.wahl@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <rja@....com>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Megha Dey <megha.dey@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Baolu Lu <baolu.lu@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [patch V2 00/46] x86, PCI, XEN, genirq ...: Prepare for device MSI

On Fri, Sep 25 2020 at 17:49, Peter Zijlstra wrote:
> Here it looks like this:
>
> [    1.830276] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [    1.838043] #PF: supervisor instruction fetch in kernel mode
> [    1.844357] #PF: error_code(0x0010) - not-present page
> [    1.850090] PGD 0 P4D 0
> [    1.852915] Oops: 0010 [#1] SMP
> [    1.856419] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.9.0-rc6-00700-g0248dedd12d4 #419
> [    1.865447] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
> [    1.876902] RIP: 0010:0x0
> [    1.879824] Code: Bad RIP value.
> [    1.883423] RSP: 0000:ffffffff82803da0 EFLAGS: 00010282
> [    1.889251] RAX: 0000000000000000 RBX: ffffffff8282b980 RCX: ffffffff82803e40
> [    1.897241] RDX: 0000000000000001 RSI: ffffffff82803e40 RDI: ffffffff8282b980
> [    1.905201] RBP: ffff88842f331000 R08: 00000000ffffffff R09: 0000000000000001
> [    1.913162] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000048
> [    1.921123] R13: ffffffff82803e40 R14: ffffffff8282b9c0 R15: 0000000000000000
> [    1.929085] FS:  0000000000000000(0000) GS:ffff88842f400000(0000) knlGS:0000000000000000
> [    1.938113] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.944524] CR2: ffffffffffffffd6 CR3: 0000000002811001 CR4: 00000000000606b0
> [    1.952484] Call Trace:
> [    1.955214]  msi_domain_alloc+0x36/0x130

Hrm. That looks like a not initialized mandatory callback. Confused.

Is this on -next and if so, does this happen on tip:x86/irq as well?

Can you provide yoru config please?

Thanks,

        tglx