[Bug 204181] NULL pointer dereference regression in amdgpu

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

--- Comment #26 from Sergey Kondakov (virtuousfox@xxxxxxxxx) ---
Created attachment 284083
  --> https://bugzilla.kernel.org/attachment.cgi?id=284083&action=edit
dmesg_2019-08-02-amdgpu_fail_on_patched_5.2.5

(In reply to Nicholas Kazlauskas from comment #24)
> This should be fixed with the series linked below:
> 
> https://patchwork.freedesktop.org/series/64505/
> 
> But it still needs review and backporting to older kernels.

Celebration might have been premature. Hours later I've got another freeze with
different error in amdgpu. Only this time, mouse cursor was movable over frozen
frame right until I tried switching VT. Here's trace:
BUG: unable to handle page fault for address: 0000000800000184
#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: 21044 Comm: kworker/u16:0 Tainted: G        W IO     
5.2.5-1396.g79b6a9c-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:amdgpu_dm_atomic_commit_tail+0x2e6/0xd60 [amdgpu]
Code: ff 48 89 de 48 8b b8 40 43 01 00 e8 94 3b 09 00 49 8b 54 24 08 48 89 9d
30 fe ff ff 8b 82 00 09 00 00 85 c0 0f 85 fb fd ff ff <80> bb 80 01 00 00 01 0f
86 a0 00 00 00 48 b9 00 00 00 00 01 00 00
RSP: 0018:ffff98198b837c30 EFLAGS: 00010202
RAX: 0000000000000023 RBX: 0000000800000004 RCX: ffff8aca7b146f18
RDX: ffff8acc2a2d9000 RSI: ffffffffc0994f00 RDI: 0000000000000002
RBP: ffff98198b837e10 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8aca97bf3540
R13: ffff8acc114b1000 R14: ffff8acc035da000 R15: 0000000000000006
FS:  0000000000000000(0000) GS:ffff8acc2e000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000800000184 CR3: 00000003747c2000 CR4: 00000000000406e0
Call Trace:
 ? mark_held_locks+0x2d/0x80
 ? _raw_spin_unlock_irq+0x3a/0x50
 ? finish_task_switch+0xa2/0x300
 ? __lock_acquire+0x3c3/0x7c0
 ? 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: r8169 binfmt_misc 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 snd_pcm_oss zram snd_mixer_oss bnep it87 hwmon_vid
msr joydev amd64_edac_mod edac_mce_amd btusb btrtl btbcm rc_avermedia btintel
kvm_amd tuner_simple tuner_types bluetooth snd_usb_audio tuner kvm tda7432
snd_usbmidi_lib snd_rawmidi irqbypass tvaudio msp3400 snd_seq_device ath9k bttv
ath9k_common ath9k_hw tea575x tveeprom ath videobuf_dma_sg videobuf_core
rc_core v4l2_common pcspkr wmi_bmof videodev mxm_wmi mac80211 fam15h_power
k10temp sp5100_tco
 media amdgpu i2c_piix4 snd_hda_codec_realtek snd_hda_codec_generic
snd_hda_codec_hdmi ledtrig_audio snd_hda_intel cfg80211 snd_hda_codec
snd_hda_core realtek gpu_sched libphy snd_hwdep ttm rfkill snd_pcm mac_hid
hid_generic usbhid uas usb_storage ohci_pci serio_raw sd_mod ohci_hcd ehci_pci
ehci_hcd xhci_pci 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 [last unloaded:
r8169]
CR2: 0000000800000184
---[ end trace 7da703104c8acbc9 ]---
RIP: 0010:amdgpu_dm_atomic_commit_tail+0x2e6/0xd60 [amdgpu]
Code: ff 48 89 de 48 8b b8 40 43 01 00 e8 94 3b 09 00 49 8b 54 24 08 48 89 9d
30 fe ff ff 8b 82 00 09 00 00 85 c0 0f 85 fb fd ff ff <80> bb 80 01 00 00 01 0f
86 a0 00 00 00 48 b9 00 00 00 00 01 00 00
RSP: 0018:ffff98198b837c30 EFLAGS: 00010202
RAX: 0000000000000023 RBX: 0000000800000004 RCX: ffff8aca7b146f18
RDX: ffff8acc2a2d9000 RSI: ffffffffc0994f00 RDI: 0000000000000002
RBP: ffff98198b837e10 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8aca97bf3540
R13: ffff8acc114b1000 R14: ffff8acc035da000 R15: 0000000000000006
FS:  0000000000000000(0000) GS:ffff8acc2e000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000800000184 CR3: 00000003747c2000 CR4: 00000000000406e0

How ironic for it to manifest again during discussion video on Youtube about
recent "JoJo" Part 5 finale's "perpetually trapped in the repeating nightmare
of a frozen time" theme…

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