RHEL7: kernel panic at build_audio_output.isra.2 when system is shutting down.

Issue

• When system is shutdown, kernel panic occurred with below logs:

[171071.095853] virbr0: port 2(vnet0) entered disabled state
[171071.097262] device vnet0 left promiscuous mode
[171071.097269] virbr0: port 2(vnet0) entered disabled state
[171085.821380] XFS (md126p2): Unmounting Filesystem
[171086.440229] IPv6: ADDRCONF(NETDEV_UP): virbr0: link is not ready
[171087.788776] Ebtables v2.0 unregistered
[171088.007239] type=1305 audit(1608216320.675:7271): audit_pid=0 old=1312 auid=4294967295 ses=4294967295 res=1
[171088.007772] type=1131 audit(1608216320.675:7272): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=auditd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.008151] type=1131 audit(1608216320.675:7273): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-setup comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.008449] type=1131 audit(1608216320.675:7274): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=rhel-import-state comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.009408] type=1131 audit(1608216320.676:7275): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=rhel-readonly comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.022399] type=1131 audit(1608216320.689:7276): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-modules-load comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.262936] XFS (dm-3): Unmounting Filesystem
[171088.331160] type=1131 audit(1608216320.998:7277): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-fsck@dev-mapper-ARRAY0_0p3\x2dusr_local comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.331919] type=1131 audit(1608216320.999:7278): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-remount-fs comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.332244] type=1131 audit(1608216320.999:7279): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-tmpfiles-setup-dev comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.332555] type=1131 audit(1608216320.999:7280): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-readahead-collect comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[171088.377479] systemd-shutdown[1]: Syncing filesystems and block devices.
[171088.380509] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[171088.388024] systemd-journald[836]: Received SIGTERM from PID 1 (systemd-shutdow).
[171088.388997] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[171088.396309] systemd-shutdown[1]: Unmounting file systems.
[171088.396570] systemd-shutdown[23760]: Remounting '/' read-only in with options 'attr2,inode64,noquota'.
[171088.536512] systemd-shutdown[1]: All filesystems unmounted.
[171088.536544] systemd-shutdown[1]: Deactivating swaps.
[171088.536624] systemd-shutdown[1]: All swaps deactivated.
[171088.536650] systemd-shutdown[1]: Detaching loop devices.
[171088.537332] systemd-shutdown[1]: All loop devices detached.
[171088.537362] systemd-shutdown[1]: Detaching DM devices.
[171088.537569] systemd-shutdown[1]: Detaching DM 253:3.
[171088.548824] systemd-shutdown[1]: Detaching DM 253:1.
[171088.560828] systemd-shutdown[1]: Not all DM devices detached, 1 left.
[171088.561046] systemd-shutdown[1]: Detaching DM devices.
[171088.561206] systemd-shutdown[1]: Not all DM devices detached, 1 left.
[171088.561237] systemd-shutdown[1]: Cannot finalize remaining DM devices, continuing.
[171088.589516] systemd-shutdown[1]: Failed to finalize  DM devices, ignoring
[171088.591023] systemd-shutdown[1]: Syncing filesystems and block devices.
[171088.592460] systemd-shutdown[1]: Powering off.
[171089.594146] kvm: exiting hardware virtualization
[171089.596843] sd 3:0:0:0: [sdb] Synchronizing SCSI cache
[171089.599059] sd 3:0:0:0: [sdb] Stopping disk
[171089.829395] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[171089.836744] sd 0:0:0:0: [sda] Stopping disk
[171091.135446] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[171091.135482] IP: [<ffffffffc0683797>] build_audio_output.isra.2+0xe7/0x130 [amdgpu]
[171091.135483] PGD 0 
[171091.135484] Oops: 0000 [#1] SMP 
[171091.135499] Modules linked in: vhost_net vhost macvtap macvlan tcp_lp tun devlink binfmt_misc ip_set_hash_ip ip_set_hash_net bridge stp llc ip_set nfnetlink sunrpc vfat fat dell_wmi iTCO_wdt dell_smbios iTCO_vendor_support dell_wmi_aio intel_wmi_thunderbolt dell_wmi_descriptor sparse_keymap dcdbas intel_pmc_core intel_powerclamp coretemp dell_led intel_rapl kvm_intel kvm snd_hda_codec_realtek snd_hda_codec_generic irqbypass crc32_pclmul ghash_clmulni_intel snd_hda_codec_hdmi aesni_intel lrw gf128mul snd_hda_intel snd_hda_codec glue_helper ablk_helper cryptd snd_hda_core snd_hwdep pcspkr snd_seq sg snd_seq_device i2c_i801 joydev snd_pcm snd_timer snd i2c_designware_platform idma64 soundcore i2c_designware_core virt_dma pcc_cpufreq pinctrl_cannonlake pinctrl_intel tpm_crb wmi acpi_pad uinput xfs libcrc32c
[171091.135506]  raid1 sr_mod sd_mod cdrom crc_t10dif crct10dif_generic amdgpu i915 chash amd_iommu_v2 iosf_mbi gpu_sched i2c_algo_bit e1000e drm_kms_helper syscopyarea ttm ahci sysfillrect sysimgblt fb_sys_fops libahci drm libata crct10dif_pclmul crct10dif_common crc32c_intel ptp serio_raw pps_core drm_panel_orientation_quirks video i2c_hid dm_mirror dm_region_hash dm_log dm_mod fuse [last unloaded: ip_tables]
[171091.135507] CPU: 10 PID: 937 Comm: kworker/10:2 Kdump: loaded Not tainted 3.10.0-1062.12.1.el7.x86_64 #1
[171091.135508] Hardware name: Dell Inc. Precision Tower 3430/00CV7F, BIOS 1.2.16 10/10/2018
[171091.135510] Workqueue: events console_callback
[171091.135511] task: ffff976ff95941c0 ti: ffff9774249d0000 task.ti: ffff9774249d0000
[171091.135539] RIP: 0010:[<ffffffffc0683797>]  [<ffffffffc0683797>] build_audio_output.isra.2+0xe7/0x130 [amdgpu]
[171091.135539] RSP: 0018:ffff9774249d37a8  EFLAGS: 00010246
[171091.135540] RAX: 0000000000000020 RBX: ffff9774249d37cc RCX: ffff977031ffa800
[171091.135540] RDX: 0000000000024414 RSI: ffff9773f3a58188 RDI: 0000000000000000
[171091.135541] RBP: ffff9774249d37b8 R08: 000000000025c3f8 R09: 0000000000020000
[171091.135541] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000005
[171091.135542] R13: ffff9773f3a58000 R14: ffff977424a80938 R15: ffff977424a80800
[171091.135543] FS:  0000000000000000(0000) GS:ffff97742bc80000(0000) knlGS:0000000000000000
[171091.135544] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[171091.135544] CR2: 0000000000000008 CR3: 0000000460bb6000 CR4: 00000000003607e0
[171091.135544] Call Trace:
[171091.135572]  [<ffffffffc068408d>] dce110_setup_audio_dto.isra.7+0x16d/0x1a0 [amdgpu]
[171091.135600]  [<ffffffffc067acb4>] ? dce112_enable_display_power_gating+0xd4/0x230 [amdgpu]
[171091.135642]  [<ffffffffc0684f5b>] dce110_apply_ctx_to_hw+0x16b/0x500 [amdgpu]
[171091.135684]  [<ffffffffc05e9730>] ? dm_pp_apply_display_requirements+0x1c0/0x250 [amdgpu]
[171091.135712]  [<ffffffffc0628604>] ? dce11_pplib_apply_display_requirements+0x1c4/0x230 [amdgpu]
[171091.135739]  [<ffffffffc0628865>] ? dce112_update_clocks+0xc5/0x140 [amdgpu]
[171091.135765]  [<ffffffffc0693b4f>] dc_commit_state+0x2df/0x660 [amdgpu]
[171091.135794]  [<ffffffffc05e39fe>] amdgpu_dm_atomic_commit_tail+0x38e/0xda0 [amdgpu]
[171091.135796]  [<ffffffffa3b814f9>] ? wait_for_completion_interruptible+0x39/0x1a0
[171091.135803]  [<ffffffffc023b962>] commit_tail+0x42/0x80 [drm_kms_helper]
[171091.135808]  [<ffffffffc023c1f8>] drm_atomic_helper_commit+0x138/0x150 [drm_kms_helper]
[171091.135819]  [<ffffffffc01bbc81>] ? drm_atomic_add_affected_connectors+0x101/0x110 [drm]
[171091.135847]  [<ffffffffc05de58f>] amdgpu_dm_atomic_commit+0xdf/0xf0 [amdgpu]
[171091.135857]  [<ffffffffc01bca4a>] drm_atomic_commit+0x4a/0x50 [drm]
[171091.135862]  [<ffffffffc0241830>] restore_fbdev_mode_atomic+0x180/0x1e0 [drm_kms_helper]
[171091.135867]  [<ffffffffc024195a>] drm_fb_helper_pan_display+0xca/0x210 [drm_kms_helper]
[171091.135869]  [<ffffffffa37f657c>] fb_pan_display+0xcc/0x190
[171091.135871]  [<ffffffffa3805dc0>] bit_update_start+0x20/0x50
[171091.135872]  [<ffffffffa3804568>] fbcon_switch+0x3a8/0x5b0
[171091.135874]  [<ffffffffa387b51f>] redraw_screen+0x1af/0x270
[171091.135875]  [<ffffffffa3870f30>] complete_change_console+0x40/0xe0
[171091.135876]  [<ffffffffa3872709>] change_console+0x59/0xa0
[171091.135877]  [<ffffffffa387d0f4>] console_callback+0x114/0x1a0
[171091.135879]  [<ffffffffa34be21f>] process_one_work+0x17f/0x440
[171091.135880]  [<ffffffffa34bf336>] worker_thread+0x126/0x3c0
[171091.135882]  [<ffffffffa34bf210>] ? manage_workers.isra.26+0x2a0/0x2a0
[171091.135883]  [<ffffffffa34c61f1>] kthread+0xd1/0xe0
[171091.135884]  [<ffffffffa34c6120>] ? insert_kthread_work+0x40/0x40
[171091.135886]  [<ffffffffa3b8dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[171091.135887]  [<ffffffffa34c6120>] ? insert_kthread_work+0x40/0x40
[171091.135898] Code: c0 83 fa 05 77 07 8b 04 95 90 b9 6f c0 89 43 34 c6 43 38 01 8b 86 64 02 00 00 89 43 3c 48 83 c4 08 5b 5d c3 48 8b 3f 48 89 75 f0 <48> 8b 47 08 48 8b 40 08 e8 bc f3 10 e3 48 8b 75 f0 89 43 2c eb 
[171091.135924] RIP  [<ffffffffc0683797>] build_audio_output.isra.2+0xe7/0x130 [amdgpu]
[171091.135924]  RSP <ffff9774249d37a8>
[171091.135925] CR2: 0000000000000008