[Bug 102022] New: i915: null pointer in intel_dp_max_link_rate+0x5/0x80

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102022

            Bug ID: 102022
           Summary: i915: null pointer in intel_dp_max_link_rate+0x5/0x80
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sassmann at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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 ]---

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