[Bug 204181] New: NULL pointer dereference regression in amdgpu

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https://bugzilla.kernel.org/show_bug.cgi?id=204181

            Bug ID: 204181
           Summary: NULL pointer dereference regression in amdgpu
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.2.1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: virtuousfox@xxxxxxxxx
        Regression: No

Created attachment 283693
  --> https://bugzilla.kernel.org/attachment.cgi?id=283693&action=edit
dmesg

After updating from 5.1 to 5.2.1 in about 5-10 minutes of watching a Youtube
video in Firefox I now get complete lock-up of video output and inability to
shutdown using power button. Using "magic keys" allows me to reboot and get
kernel log via `journalctl -b -1 -k`, here is relevant part:
BUG: kernel NULL pointer dereference, address: 00000000000002b4
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP NOPTI
CPU: 2 PID: 8200 Comm: kworker/u16:1 Tainted: G          IO     
5.2.1-1383.gd5bbc26-HSF #1 openSUSE Tumbleweed (unreleased)
Hardware name: Gigabyte Technology Co., Ltd. GA-990XA-UD3/GA-990XA-UD3, BIOS
F14e 09/09/2014
Workqueue: events_unbound commit_work
RIP: 0010:dc_stream_log+0x6/0xb0 [amdgpu]
Code: 04 00 00 49 8b bc 02 80 02 00 00 48 8b 07 48 8b 40 50 e8 ed 88 a8 d6 b8
01 00 00 00 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 53 <8b> 86 b4 02 00 00 48 89
f3 48 89 f2 8b 8e 10 01 00 00 bf 04 00 00
RSP: 0018:ffffa5568b1b7c00 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffffffffc07fbd50 RSI: 0000000000000000 RDI: ffff8e9ee9500000
RBP: ffff8e9d90618000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffa5568b1b7c30 R11: 0000000000000000 R12: ffff8e9ee9500000
R13: ffff8e9ededb4448 R14: ffff8e9e47e10c00 R15: ffff8e9ededa0000
FS:  0000000000000000(0000) GS:ffff8e9eee000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000002b4 CR3: 00000003bcf46000 CR4: 00000000000406e0
Call Trace:
 dc_commit_state+0x79/0xb0 [amdgpu]
 amdgpu_dm_atomic_commit_tail+0x3c0/0xdb0 [amdgpu]
 ? finish_task_switch+0x74/0x300
 ? __switch_to+0x152/0x4e0
 ? __switch_to_asm+0x34/0x70
 ? __lock_acquire+0x3c8/0x7a0
 ? find_held_lock+0x32/0x90
 ? find_held_lock+0x32/0x90
 ? sched_clock+0x5/0x10
 ? mark_held_locks+0x2d/0x80
 ? preempt_count_sub+0x98/0xe0
 ? _raw_spin_unlock_irq+0x3a/0x50
 ? wait_for_completion_timeout+0xe9/0x110
 ? commit_tail+0x3c/0x70
 commit_tail+0x3c/0x70
 process_one_work+0x271/0x5f0
 worker_thread+0x4a/0x3d0
 ? process_one_work+0x5f0/0x5f0
 kthread+0x118/0x140
 ? kthread_create_worker_on_cpu+0x70/0x70
 ret_from_fork+0x27/0x50
Modules linked in: af_packet ts_bm xt_pkttype xt_string nf_nat_ftp
nf_conntrack_ftp xt_tcpudp ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack
ebtable_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security
iptable_nat nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack
nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink ebtable_filter ebtables
scsi_transport_iscsi ip6table_filter ip6_tables iptable_filter ip_tables
x_tables bpfilter snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq zram
snd_pcm_oss rfcomm snd_mixer_oss it87 hwmon_vid bnep msr rc_avermedia
tuner_simple tuner_types amd64_edac_mod tuner tda7432 edac_mce_amd btusb
tvaudio kvm_amd ath9k btrtl btbcm msp3400 ath9k_common btintel bluetooth
ath9k_hw kvm irqbypass ath bttv tea575x joydev tveeprom videobuf_dma_sg
snd_usb_audio videobuf_core snd_usbmidi_lib rc_core snd_rawmidi
snd_hda_codec_realtek mac80211 snd_hda_codec_generic ledtrig_audio
snd_hda_codec_hdmi v4l2_common snd_seq_device
 snd_hda_intel videodev sp5100_tco pcspkr snd_hda_codec wmi_bmof mxm_wmi amdgpu
fam15h_power k10temp media i2c_piix4 cfg80211 r8169 snd_hda_core gpu_sched
realtek snd_hwdep libphy ttm rfkill snd_pcm mac_hid hid_generic usbhid uas
usb_storage ohci_pci serio_raw sd_mod ehci_pci ohci_hcd xhci_pci ehci_hcd
xhci_hcd wmi exfat(O) l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel
pppox ppp_generic slhc vhba(O) uinput sg nbd dm_multipath scsi_dh_rdac
scsi_dh_emc scsi_dh_alua ecryptfs
CR2: 00000000000002b4
---[ end trace 0633d97cb3f2d2d6 ]---
RIP: 0010:dc_stream_log+0x6/0xb0 [amdgpu]
Code: 04 00 00 49 8b bc 02 80 02 00 00 48 8b 07 48 8b 40 50 e8 ed 88 a8 d6 b8
01 00 00 00 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 53 <8b> 86 b4 02 00 00 48 89
f3 48 89 f2 8b 8e 10 01 00 00 bf 04 00 00
RSP: 0018:ffffa5568b1b7c00 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002
RDX: ffffffffc07fbd50 RSI: 0000000000000000 RDI: ffff8e9ee9500000
RBP: ffff8e9d90618000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffa5568b1b7c30 R11: 0000000000000000 R12: ffff8e9ee9500000
R13: ffff8e9ededb4448 R14: ffff8e9e47e10c00 R15: ffff8e9ededa0000
FS:  0000000000000000(0000) GS:ffff8e9eee000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000002b4 CR3: 00000003bcf46000 CR4: 00000000000406e0

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