From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 85771] unable to handle kernel NULL pointer dereference in dce6_bandwidth_update Date: Sun, 02 Nov 2014 20:25:36 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0217596008==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 38DE86E1E7 for ; Sun, 2 Nov 2014 12:25:36 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0217596008== Content-Type: multipart/alternative; boundary="1414959936.ECbfe0.31992"; charset="UTF-8" --1414959936.ECbfe0.31992 Date: Sun, 2 Nov 2014 20:25:36 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=85771 --- Comment #1 from Ben Hutchings --- (In reply to Frederik Himpe from comment #0) > [ 6.440842] BUG: unable to handle kernel NULL pointer dereference at > 0000000000000090 > [ 6.441017] IP: [] dce6_bandwidth_update+0x43/0x100 > [radeon] > [ 6.441143] PGD 0 > [ 6.441241] Oops: 0000 [#1] SMP > [ 6.441380] Modules linked in: snd_hda_codec_hdmi x86_pkg_temp_thermal > evdev intel_powerclamp snd_hda_codec_realtek iTCO_wdt intel_rapl > iTCO_vendor_support snd_hda_codec_generic acpi_cpufreq(-) coretemp kvm_intel > kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul > glue_helper ablk_helper psmouse cryptd pcspkr serio_raw snd_hda_intel(+) > snd_hda_controller sr_mod sg cdrom radeon(+) snd_hda_codec ttm snd_hwdep > drm_kms_helper snd_pcm nuvoton_cir video intel_smartconnect drm rc_core > battery tpm_tis i2c_algo_bit tpm i2c_i801 snd_timer ehci_pci ehci_hcd snd > i2c_core xhci_hcd mei_me soundcore processor button mei usbcore lpc_ich > ie31200_edac usb_common mfd_core edac_core thermal_sys fuse autofs4 btrfs > xor raid6_pq dm_mod netconsole configfs sd_mod crc_t10dif crct10dif_generic > ahci libahci crct10dif_pclmul crct10dif_common crc32c_intel libata scsi_mod > r8169 mii shpchp > [ 6.445512] CPU: 3 PID: 933 Comm: laptop_mode Not tainted 3.17.2.1 #1 [...] > [ 6.447200] [] ? radeon_set_dpm_state+0x6e/0xe0 > [radeon] > [ 6.447255] [] ? kernfs_fop_write+0xe3/0x160 > [ 6.447307] [] ? vfs_write+0xb2/0x1f0 [...] So this is triggered by laptop_mode writing to the dpm_state attribute. Presumably that doesn't happen if the driver fails to initialise at boot (as it will with modeset=0) and is reloaded after booting. -- You are receiving this mail because: You are the assignee for the bug. --1414959936.ECbfe0.31992 Date: Sun, 2 Nov 2014 20:25:36 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 1 on bug 85771 from 
(In reply to Frederik Himpe from comment #0)
> [    6.440842] BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000090
> [    6.441017] IP: [<ffffffffa04e08c3>] dce6_bandwidth_update+0x43/0x100
> [radeon]
> [    6.441143] PGD 0 
> [    6.441241] Oops: 0000 [#1] SMP 
> [    6.441380] Modules linked in: snd_hda_codec_hdmi x86_pkg_temp_thermal
> evdev intel_powerclamp snd_hda_codec_realtek iTCO_wdt intel_rapl
> iTCO_vendor_support snd_hda_codec_generic acpi_cpufreq(-) coretemp kvm_intel
> kvm crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul
> glue_helper ablk_helper psmouse cryptd pcspkr serio_raw snd_hda_intel(+)
> snd_hda_controller sr_mod sg cdrom radeon(+) snd_hda_codec ttm snd_hwdep
> drm_kms_helper snd_pcm nuvoton_cir video intel_smartconnect drm rc_core
> battery tpm_tis i2c_algo_bit tpm i2c_i801 snd_timer ehci_pci ehci_hcd snd
> i2c_core xhci_hcd mei_me soundcore processor button mei usbcore lpc_ich
> ie31200_edac usb_common mfd_core edac_core thermal_sys fuse autofs4 btrfs
> xor raid6_pq dm_mod netconsole configfs sd_mod crc_t10dif crct10dif_generic
> ahci libahci crct10dif_pclmul crct10dif_common crc32c_intel libata scsi_mod
> r8169 mii shpchp
> [    6.445512] CPU: 3 PID: 933 Comm: laptop_mode Not tainted 3.17.2.1 #1
[...]
> [    6.447200]  [<ffffffffa04b8ffe>] ? radeon_set_dpm_state+0x6e/0xe0
> [radeon]
> [    6.447255]  [<ffffffff81222f23>] ? kernfs_fop_write+0xe3/0x160
> [    6.447307]  [<ffffffff811b0bd2>] ? vfs_write+0xb2/0x1f0
[...]

So this is triggered by laptop_mode writing to the dpm_state attribute. 
Presumably that doesn't happen if the driver fails to initialise at boot (as it
will with modeset=0) and is reloaded after booting.

You are receiving this mail because:
  • You are the assignee for the bug.
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