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Date: Fri, 21 Mar 2014 10:09:30 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Alex Deucher <alexander.deucher@....com>,
DRI mailing list <dri-devel@...ts.freedesktop.org>,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [pci] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_crtc.c:94
drm_warn_on_modeset_not_all_locked()
// CC Stephane for RAPL related bug
Bjorn, sorry this bug report is mis-titled. The only new bug that show
up in aa11fc58dc is on rapl_pmu_init. And it shows up only 1 time, so
it's hard to reproduce and the bisect is likely not accurate. I'll
retry the bisect with more repeat count. Sorry for the disturbing!
[ 2.812392] Unpacking initramfs...
[ 2.812392] Unpacking initramfs...
[ 4.937582] Freeing initrd memory: 3276K (93cbd000 - 93ff0000)
[ 4.937582] Freeing initrd memory: 3276K (93cbd000 - 93ff0000)
[ 4.952113] BUG: unable to handle kernel
[ 4.952113] BUG: unable to handle kernel NULL pointer dereferenceNULL pointer dereference at 0000003c
at 0000003c
[ 4.952871] IP:
[ 4.952871] IP: [<81c439fb>] rapl_pmu_init+0xed/0x165
[<81c439fb>] rapl_pmu_init+0xed/0x165
[ 4.954190] *pde = 00000000
[ 4.954190] *pde = 00000000
[ 4.954619] Oops: 0000 [#1]
[ 4.954619] Oops: 0000 [#1]
[ 4.955440] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0-rc1-00023-gaa11fc5 #1
[ 4.955440] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0-rc1-00023-gaa11fc5 #1
[ 4.956050] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 4.956050] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 4.956672] task: 80030c20 ti: 80032000 task.ti: 80032000
[ 4.956672] task: 80030c20 ti: 80032000 task.ti: 80032000
[ 4.957295] EIP: 0060:[<81c439fb>] EFLAGS: 00000246 CPU: 0
[ 4.957295] EIP: 0060:[<81c439fb>] EFLAGS: 00000246 CPU: 0
[ 4.957831] EIP is at rapl_pmu_init+0xed/0x165
[ 4.957831] EIP is at rapl_pmu_init+0xed/0x165
Full dmesg attached.
Thanks,
Fengguang
On Thu, Mar 20, 2014 at 04:50:08PM -0600, Bjorn Helgaas wrote:
> On Thu, Mar 20, 2014 at 6:41 AM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> > Greetings,
> >
> > I got the below dmesg and the first bad commit is
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/resource
> >
> > commit aa11fc58dc71c27701b1f9a529a36a38d4337722
> > Author: Bjorn Helgaas <bhelgaas@...gle.com>
> > AuthorDate: Fri Mar 7 13:39:01 2014 -0700
> > Commit: Bjorn Helgaas <bhelgaas@...gle.com>
> > CommitDate: Wed Mar 19 15:00:16 2014 -0600
> >
> > PCI: Check all IORESOURCE_TYPE_BITS in pci_bus_alloc_from_region()
> >
> > When allocating space from a bus resource, i.e., from apertures leading to
> > this bus, make sure the entire resource type matches. The previous code
> > assumed the IORESOURCE_TYPE_BITS field was a bitmask with only a single bit
> > set, but this is not true. IORESOURCE_TYPE_BITS is really an enumeration,
> > and we have to check all the bits.
> >
> > See 72dcb1197228 ("resources: Add register address resource type").
> >
> > No functional change. If we used this path for allocating IRQs, DMA
> > channels, or bus numbers, this would fix a bug because those types are
> > indistinguishable when masked by IORESOURCE_IO | IORESOURCE_MEM. But we
> > don't, so this shouldn't make any difference.
> >
> > Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Thanks (I think). I'm afraid I'm going to need some more help to
> debug this. I built aa11fc58dc with the config you supplied and
> booted it on qemu with no real issues (it didn't boot all the way
> because the config doesn't include a driver for my root disk, but
> that's to be expected).
>
> The dmesg you supplied is for some other commit 2d18516 that I don't
> have, so I'm confused about why it's not from aa11fc58dc.
>
> I did reproduce what appears to be basically the same problem with
> a654dc797f3e, which is the 20140320 linux-next tree. I backed up to
> 93ecdc077282, which is where pci/next was merged (this includes
> aa11fc58dc), but I could not reproduce the problem there.
>
> So bottom line, I'm confused because your bisection doesn't match what
> I'm seeing, and I don't want to spend more time flailing around.
>
> Bjorn
>
>
> > +------------------------------------------------------------------------------------------------+------------+------------+
> > | | aa11fc58dc | 2d18516523 |
> > +------------------------------------------------------------------------------------------------+------------+------------+
> > | boot_successes | 19 | 0 |
> > | boot_failures | 1 | 19 |
> > | BUG:unable_to_handle_kernel_NULL_pointer_dereference | 1 | 1 |
> > | Oops | 1 | 1 |
> > | EIP_is_at_rapl_pmu_init | 1 | 1 |
> > | Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 1 | 1 |
> > | backtrace:rapl_pmu_init | 1 | 1 |
> > | backtrace:kernel_init_freeable | 1 | 19 |
> > | WARNING:CPU:PID:at_drivers/gpu/drm/drm_crtc.c:drm_warn_on_modeset_not_all_locked() | 0 | 18 |
> > | WARNING:CPU:PID:at_drivers/gpu/drm/drm_crtc_helper.c:drm_helper_encoder_in_use() | 0 | 18 |
> > | WARNING:CPU:PID:at_drivers/gpu/drm/drm_crtc_helper.c:drm_helper_crtc_in_use() | 0 | 18 |
> > | WARNING:CPU:PID:at_drivers/gpu/drm/drm_crtc_helper.c:drm_helper_probe_single_connector_modes() | 0 | 18 |
> > | WARNING:CPU:PID:at_drivers/gpu/drm/drm_modes.c:drm_mode_probed_add() | 0 | 18 |
> > | WARNING:CPU:PID:at_drivers/gpu/drm/drm_modes.c:drm_mode_connector_list_update() | 0 | 18 |
> > | backtrace:drm_helper_disable_unused_functions | 0 | 18 |
> > | backtrace:cirrus_fbdev_init | 0 | 18 |
> > | backtrace:cirrus_modeset_init | 0 | 18 |
> > | backtrace:__pci_register_driver | 0 | 18 |
> > | backtrace:drm_pci_init | 0 | 18 |
> > | backtrace:cirrus_init | 0 | 18 |
> > | backtrace:drm_fb_helper_initial_config | 0 | 18 |
> > +------------------------------------------------------------------------------------------------+------------+------------+
> >
> > [ 1.624247] [TTM] Initializing pool allocator
> > [ 1.625248] ------------[ cut here ]------------
> > [ 1.625248] ------------[ cut here ]------------
> > [ 1.626136] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_crtc.c:94 drm_warn_on_modeset_not_all_locked+0x61/0xc6()
> >
> > git bisect start 2d1851652373730f6b8c7fa7f45eaa854f23da8f dcb99fd9b08cfe1afe426af4d8d3cbc429190f15 --
> > git bisect bad 82202f95148065d7a0f5d86d4d6e39f31dbd7937 # 12:19 0- 10 Merge 'asoc/fix/cs42l51' into devel-hourly-2014032007
> > git bisect good 9115e0b3218bd6b97e830bc36e6e80c4890f6fe4 # 12:45 20+ 0 Merge 'scsi/misc' into devel-hourly-2014032007
> > git bisect good 4fb88b0dc2d9b229d03a9e6555d9056888c90137 # 14:42 20+ 0 Merge 'target/for-next' into devel-hourly-2014032007
> > git bisect bad c5011f998a8e94c052c5aa71cf19510f2d0bf5fd # 15:06 0- 1 Merge 'pci/pci/resource' into devel-hourly-2014032007
> > git bisect good daec480a6e6be6e9716a56029aafcbfb79e6b47b # 15:41 20+ 0 Merge 'netdev-next/master' into devel-hourly-2014032007
> > git bisect good 937441ae220fd3fae143ef394227337c969ad155 # 15:57 20+ 0 Merge 'kvm/queue' into devel-hourly-2014032007
> > git bisect good 3cedcc3621289d41bd21c5dbe0b886d57c83a1ea # 16:27 20+ 0 PCI: Don't enable decoding if BAR hasn't been assigned an address
> > git bisect good d75332325389a95c4ddbfa0f0cd7e5e08a54aa43 # 16:54 20+ 0 s390/PCI: Use generic pci_enable_resources()
> > git bisect bad aa11fc58dc71c27701b1f9a529a36a38d4337722 # 17:11 0- 1 PCI: Check all IORESOURCE_TYPE_BITS in pci_bus_alloc_from_region()
> > git bisect good 6404e88e8385638123f4b18b104430480870601a # 17:23 20+ 0 resources: Set type in __request_region()
> > # first bad commit: [aa11fc58dc71c27701b1f9a529a36a38d4337722] PCI: Check all IORESOURCE_TYPE_BITS in pci_bus_alloc_from_region()
> > git bisect good 6404e88e8385638123f4b18b104430480870601a # 17:27 60+ 0 resources: Set type in __request_region()
> > git bisect bad 2d1851652373730f6b8c7fa7f45eaa854f23da8f # 17:27 0- 19 0day head guard for 'devel-hourly-2014032007'
> > git bisect good 887843961c4b4681ee993c36d4997bf4b4aa8253 # 19:24 60+ 0 mm: fix bad rss-counter if remap_file_pages raced migration
> > git bisect bad a654dc797f3ea1cb5719a71a17af35f57fddb2d8 # 20:10 0- 1 Add linux-next specific files for 20140320
> >
> > Thanks,
> > Fengguang
View attachment "dmesg-yocto-waimea-3:20140320171051:i386-randconfig-nh0-03200538:3.14.0-rc1-00023-gaa11fc5:1" of type "text/plain" (35249 bytes)
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