[Bug 204181] NULL pointer dereference regression in amdgpu

Sun Aug 4 05:17:02 UTC 2019

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

--- Comment #27 from Sergey Kondakov (virtuousfox at gmail.com) ---
Created attachment 284153
  --> https://bugzilla.kernel.org/attachment.cgi?id=284153&action=edit
dmesg_2019-08-04-amdgpu-new_dereference-with-shadowprimary

So, I've been using explicitly disabled "EnablePageFlip" and "TearFree" options
as workaround for the original dereference but then decided to try out
"ShadowPrimary" during fiddling with mvtools' motion-interpolation optimization
in mpv, since page flipping is disabled anyway. But the result was ANOTHER null
pointer dereference mere seconds after login:
BUG: kernel NULL pointer dereference, address: 0000000000000008
#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: 1 PID: 3272 Comm: X:cs0 Tainted: G          IO     
5.2.5-1407.g79b6a9c-HSF #1 openSUSE Tumbleweed
Hardware name: Gigabyte Technology Co., Ltd. GA-990XA-UD3/GA-990XA-UD3, BIOS
F14e 09/09/2014
RIP: 0010:amdgpu_vm_update_directories+0xe7/0x260 [amdgpu]
Code: 89 08 48 8d 4a 40 48 89 48 08 48 89 42 40 48 8b 78 f0 c6 40 10 00 4c 8b
a7 80 06 00 00 4d 85 e4 74 08 4d 8b a4 24 40 04 00 00 <4d> 8b 6c 24 08 31 f6 49
8b 95 80 06 00 00 48 85 d2 74 0f 48 8b 92
RSP: 0018:ffffafc2478aba10 EFLAGS: 00010246
RAX: ffff98742e20e670 RBX: ffff98742e20e658 RCX: ffff98744fc66040
RDX: ffff98744fc66000 RSI: ffff98742e20e638 RDI: ffff9873a295f800
RBP: ffff987459e00000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffafc2478abb58 R14: ffff98744fc66000 R15: ffffafc2478abb58
FS:  00007f3ee03d7700(0000) GS:ffff98746de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000003f27aa000 CR4: 00000000000406e0
Call Trace:
 amdgpu_cs_vm_handling+0x308/0x440 [amdgpu]
 amdgpu_cs_ioctl+0x154/0xa10 [amdgpu]
 ? amdgpu_cs_vm_handling+0x440/0x440 [amdgpu]
 drm_ioctl_kernel+0xaa/0xf0
 drm_ioctl+0x208/0x385
 ? amdgpu_cs_vm_handling+0x440/0x440 [amdgpu]
 ? _raw_spin_unlock_irqrestore+0x59/0x70
 ? preempt_count_sub+0x98/0xe0
 ? _raw_spin_unlock_irqrestore+0x46/0x70
 amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
 do_vfs_ioctl+0x3ed/0x720
 ? __fget+0xf9/0x1b0
 ksys_ioctl+0x5e/0x90
 __x64_sys_ioctl+0x16/0x20
 do_syscall_64+0x66/0xc0
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f3ee641c7c7
Code: 00 00 90 48 8b 05 d1 86 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff
c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01
c3 48 8b 0d a1 86 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007f3ee03d6a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3ee03d6a70 RCX: 00007f3ee641c7c7
RDX: 00007f3ee03d6a70 RSI: 00000000c0186444 RDI: 000000000000000e
RBP: 00000000c0186444 R08: 00007f3ee03d6b80 R09: 0000000000000020
R10: 00007f3ee03d6b80 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000e R14: 000055d55e6f8bf0 R15: 000055d55e6f91a8
Modules linked in: af_packet 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 snd_mixer_oss
msr bnep it87 hwmon_vid zram amd64_edac_mod edac_mce_amd kvm_amd kvm
rc_avermedia tuner_simple tuner_types irqbypass tuner tda7432 btusb btrtl btbcm
btintel tvaudio msp3400 bluetooth snd_usb_audio ath9k joydev bttv ath9k_common
snd_usbmidi_lib tea575x ath9k_hw tveeprom snd_rawmidi videobuf_dma_sg mxm_wmi
wmi_bmof pcspkr ath videobuf_core snd_seq_device k10temp fam15h_power rc_core
snd_hda_codec_realtek v4l2_common snd_hda_codec_generic
 sp5100_tco snd_hda_codec_hdmi ledtrig_audio mac80211 amdgpu videodev media
i2c_piix4 snd_hda_intel cfg80211 snd_hda_codec r8169 snd_hda_core realtek
snd_hwdep libphy snd_pcm gpu_sched rfkill ttm mac_hid hid_generic usbhid uas
usb_storage ohci_pci serio_raw sd_mod ehci_pci ohci_hcd 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
CR2: 0000000000000008
---[ end trace a7f0ed14134a76ad ]---
RIP: 0010:amdgpu_vm_update_directories+0xe7/0x260 [amdgpu]
Code: 89 08 48 8d 4a 40 48 89 48 08 48 89 42 40 48 8b 78 f0 c6 40 10 00 4c 8b
a7 80 06 00 00 4d 85 e4 74 08 4d 8b a4 24 40 04 00 00 <4d> 8b 6c 24 08 31 f6 49
8b 95 80 06 00 00 48 85 d2 74 0f 48 8b 92
RSP: 0018:ffffafc2478aba10 EFLAGS: 00010246
RAX: ffff98742e20e670 RBX: ffff98742e20e658 RCX: ffff98744fc66040
RDX: ffff98744fc66000 RSI: ffff98742e20e638 RDI: ffff9873a295f800
RBP: ffff987459e00000 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffafc2478abb58 R14: ffff98744fc66000 R15: ffffafc2478abb58
FS:  00007f3ee03d7700(0000) GS:ffff98746de00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000003f27aa000 CR4: 00000000000406e0

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