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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915: null pointer in intel_dp_max_link_rate+0x5/0x80"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102022">102022</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>i915: null pointer in intel_dp_max_link_rate+0x5/0x80
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sassmann@redhat.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>After switching display inputs on the monitor (Dell U3415W) the screen wouldn't
come back from standby. Reproduced this with drm-tip
(fcb630a80579faf6d12ee62cb49bd7a4acff41e6)
The following was in the log:
[34165.674696] BUG: unable to handle kernel NULL pointer dereference at
0000000000000088
[34165.674742] IP: intel_dp_max_link_rate+0x5/0x80 [i915]
[34165.674744] PGD 65f27f067·
[34165.674744] P4D 65f27f067·
[34165.674745] PUD 63c8d2067·
[34165.674746] PMD 0·
[34165.674748] Oops: 0000 [#1] SMP
[34165.674750] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs
fscache veth rfcomm fuse xt_CHECKSUM tun ipt_MASQUERADE nf_nat_masquerade_ipv4
xt_addrtype br_netfilter ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack
overlay ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat
nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw
ip6table_security iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4
nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw iptable_security
ebtable_filter ebtables ip6table_filter ip6_tables cmac bnep rmi_smbus rmi_core
vfat fat arc4 intel_rapl x86_pkg_temp_thermal intel_powerclamp uvcvideo
coretemp videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core
iTCO_wdt iTCO_vendor_support kvm_intel mei_wdt snd_hda_codec_realtek
[34165.674780] kvm snd_hda_codec_generic snd_hda_codec_hdmi btusb videodev
irqbypass btrtl iwlmvm btbcm intel_cstate btintel snd_hda_intel mac80211
snd_hda_codec intel_uncore bluetooth media snd_hda_core iwlwifi intel_rapl_perf
snd_hwdep snd_seq ecdh_generic joydev pcspkr snd_seq_device cfg80211 snd_pcm
thinkpad_acpi tpm_tis tpm_tis_core snd_timer tpm rfkill snd mei_me ie31200_edac
soundcore mei i2c_i801 shpchp lpc_ich wmi_bmof target_core_mod binfmt_misc nfsd
auth_rpcgss nfs_acl lockd grace sunrpc dm_crypt uas usb_storage i915
crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel serio_raw
i2c_algo_bit sdhci_pci e1000e drm_kms_helper sdhci mmc_core drm ptp pps_core
wmi video
[34165.674812] CPU: 1 PID: 6642 Comm: Xorg Not tainted 4.13.0-rc3+ #6
[34165.674814] Hardware name: LENOVO 20EGS0R60P/20EGS0R60P, BIOS GNET83WW (2.31
) 05/03/2017
[34165.674815] task: ffff91f904a34c80 task.stack: ffffa80e48414000
[34165.674838] RIP: 0010:intel_dp_max_link_rate+0x5/0x80 [i915]
[34165.674840] RSP: 0018:ffffa80e48417bb8 EFLAGS: 00010286
[34165.674841] RAX: ffff91f91a658000 RBX: ffff91f91b887d00 RCX:
0000000000000303
[34165.674842] RDX: 000000000000000c RSI: ffff91f91b887d00 RDI:
0000000000000000
[34165.674843] RBP: ffffa80e48417be0 R08: 000000000001f900 R09:
ffffffffc01cf1a6
[34165.674844] R10: ffffcfe94418c580 R11: 0000000000000039 R12:
0000000000000000
[34165.674844] R13: 0000000000083d60 R14: ffff91f91b887d00 R15:
0000000000000000
[34165.674846] FS: 00007f41b6b7f2c0(0000) GS:ffff91f93e240000(0000)
knlGS:0000000000000000
[34165.674847] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[34165.674848] CR2: 0000000000000088 CR3: 00000006518f5000 CR4:
00000000001406e0
[34165.674849] Call Trace:
[34165.674849] Call Trace:
[34165.674871] ? intel_dp_mst_mode_valid+0x2c/0xa0 [i915]
[34165.674878] drm_helper_probe_single_connector_modes+0x460/0x780
[drm_kms_helper]
[34165.674892] drm_mode_getconnector+0x153/0x330 [drm]
[34165.674900] ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[34165.674907] drm_ioctl_kernel+0x5d/0xb0 [drm]
[34165.674913] drm_ioctl+0x32a/0x400 [drm]
[34165.674920] ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[34165.674923] do_vfs_ioctl+0xa5/0x600
[34165.674925] ? __do_page_fault+0x267/0x4c0
[34165.674927] SyS_ioctl+0x79/0x90
[34165.674930] entry_SYSCALL_64_fastpath+0x1a/0xa5
[34165.674931] RIP: 0033:0x7f41b44025b7
[34165.674932] RSP: 002b:00007ffd266b5f18 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[34165.674934] RAX: ffffffffffffffda RBX: 0000000000c39d88 RCX:
00007f41b44025b7
[34165.674934] RDX: 00007ffd266b5f50 RSI: 00000000c05064a7 RDI:
000000000000000c
[34165.674935] RBP: 0000000000c39d60 R08: 0000000001720f30 R09:
00000000000000c0
[34165.674936] R10: 0000000000000000 R11: 0000000000000246 R12:
000000000084e100
[34165.674937] R13: 000000000000000b R14: 0000000000000000 R15:
00000000008445a0
[34165.674938] Code: 00 00 00 83 e1 ef 66 81 f9 0e 0a 75 e8 80 ba 1d 06 00 00
08 0f 97 c0 eb dc 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <8b> 8f
88 00 00 00 44 8b 87 b0 00 00 00 85 c9 7e 35 48 63 c1 44·
[34165.674979] RIP: intel_dp_max_link_rate+0x5/0x80 [i915] RSP:
ffffa80e48417bb8
[34165.674980] CR2: 0000000000000088
[34165.674981] ---[ end trace 7cd7f2a9e04abe5e ]---</pre>
</div>
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