i915 0000:00:02.0: GPU HANG: ecode 9:1:0x85dffffb, in Xorg [1360], hang on rcs0

After upgrade to 5.4.13 (debian testing) from 5.3(ish), my system has gotten increasingly unstable. During firefox WebRender draws, things occasionally full-hang the system (well, its that or the NULL ptr dereferences in iwlwifi...). One got dumped to dmesg (note the old bugs.freedesktop URL):

Feb 11 16:33:09 BMXPSv3 kernel: i915 0000:00:02.0: GPU HANG: ecode 9:1:0x85dffffb, in Xorg [1360], hang on rcs0
Feb 11 16:33:09 BMXPSv3 kernel: GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Feb 11 16:33:09 BMXPSv3 kernel: Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Feb 11 16:33:09 BMXPSv3 kernel: drm/i915 developers can then reassign to the right component if it's not a kernel issue.
Feb 11 16:33:09 BMXPSv3 kernel: The GPU crash dump is required to analyze GPU hangs, so please always attach it.
Feb 11 16:33:09 BMXPSv3 kernel: GPU crash dump saved to /sys/class/drm/card0/error
Feb 11 16:33:09 BMXPSv3 kernel: i915 0000:00:02.0: Resetting rcs0 for hang on rcs0

GPU HANG: ecode 9:1:0x85dffffb, in Xorg [1360], hang on rcs0
Kernel: 5.4.0-3-amd64 x86_64
Driver: 20190822
Time: 1581456789 s 298548 us
Boottime: 1630 s 871558 us
Uptime: 1629 s 470310 us
Epoch: 4295298472 jiffies (250 HZ)
Capture: 4295299976 jiffies; 42056 ms ago, 6016 ms after epoch
Active process (on ring rcs0): Xorg [1360]
Reset count: 0
Suspend count: 0
Platform: COFFEELAKE
Subplatform: 0x0
PCI ID: 0x3e94
PCI Revision: 0x00
PCI Subsystem: 1028:087d
IOMMU enabled?: 1
DMC loaded: no
DMC fw version: 0.0
GT awake: yes
RPM wakelock: yes
PM suspended: no
EIR: 0x00000000
IER: 0x08080000
GTIER[0]: 0x01010101
GTIER[1]: 0x01010101
GTIER[2]: 0x00000070
GTIER[3]: 0x00000101
PGTBL_ER: 0x00000000
FORCEWAKE: 0x00010001
DERRMR: 0x2077efef
CCID: 0x00000000
  fence[0] = 00000000
  fence[1] = 00000000
  fence[2] = 00000000
  fence[3] = 00000000
  fence[4] = 00000000
  fence[5] = 00000000
  fence[6] = 00000000
  fence[7] = 00000000
  fence[8] = 00000000
  fence[9] = 00000000
  fence[10] = 00000000
  fence[11] = 00000000
  fence[12] = 00000000
  fence[13] = 00000000
  fence[14] = 00000000
  fence[15] = 00000000
  fence[16] = 00000000
  fence[17] = 00000000
  fence[18] = 00000000
  fence[19] = 00000000
  fence[20] = 00000000
  fence[21] = 00000000
  fence[22] = 00000000
  fence[23] = 00000000
  fence[24] = 00000000
  fence[25] = 00000000
  fence[26] = 00000000
  fence[27] = 00000000
  fence[28] = 00000000
  fence[29] = 00000000
  fence[30] = 00000000
  fence[31] = 00000000
ERROR: 0x00000000
DONE_REG: 0xffffffff
FAULT_TLB_DATA: 0x0000001c 0xe81b5990
rcs0 command stream:
  IDLE?: no
  START: 0x00005000
  HEAD:  0x00200c58 [0x00000c00]
  TAIL:  0x00002620 [0x00000c60, 0x00000ca8]
  CTL:   0x00003001
  MODE:  0x00000000
  HWS:   0xffffe000
  ACTHD: 0x0000fffe ec244468
  IPEIR: 0x00000000
  IPEHR: 0x7a000004
  INSTDONE: 0xffdfffff
  SC_INSTDONE: 0xffffff9f
  SAMPLER_INSTDONE[0][0]: 0xffffff3b
  SAMPLER_INSTDONE[0][1]: 0xffffff3b
  SAMPLER_INSTDONE[0][2]: 0xffffff3b
  ROW_INSTDONE[0][0]: 0xfbff7ff5
  ROW_INSTDONE[0][1]: 0xfa107ff4
  ROW_INSTDONE[0][2]: 0xfb107ff4
  batch: [0x0000fffe_ec244000, 0x0000fffe_ec24e000]
  BBADDR: 0x0000fffe_ec244469
  BB_STATE: 0x00000020
  INSTPS: 0x00009080
  INSTPM: 0x00000000
  FADDR: 0x0000fffe ec244600
  RC PSMI: 0x00000010
  FAULT_REG: 0x00000000
  GFX_MODE: 0x00008000
  PDP0: 0x00000000fbffe000
  PDP1: 0x0000000000000000
  PDP2: 0x0000000000000000
  PDP3: 0x0000000000000000
  ring->head: 0x00000bb0
  ring->tail: 0x00002618
  hangcheck timestamp: 0ms (4295298472; epoch)
  engine reset count: 0
  ELSP[0]:  pid 1360, seqno       10:00020232+, prio 2, emitted -72ms, start 00005000, head 00002570, tail 00002618
  ELSP[1]:  pid 1831, seqno       17:00008c6a+, prio 3, emitted -56ms, start 00021000, head 00000f70, tail 00001018
  Active context: Xorg[1360] hw_id 1, prio 0, guilty 0 active 0
rcs0 (submitted by Xorg [1360]) --- gtt_offset = 0x0000fffe ec244000
:fBo)Q5h&]H?h(oO:.KYO!Pn]n"uq*i#'#n4=O&'2D.4odQCXSA7WC6mJ0,/FJ1'4!!V!<P9+(`Eh;%Z2JHp43N9E2F_,&rLfmh[./kc'm\L;#5ftVWqlBXQ-*L?Ab%kM$Er,&l2\!Zs<B38R]q[upl5M7VK5D`:C68^9#q/S(!D*uC@Gm!b8HQ'5`LE$^B]TpM>\o*9&>n<a@a89\#"<@pqo/@`a9Y.=qVB7lABLc,VgHmh\cIrkuZ7BgY_/?lb/"_29UrN@N@i4WV2Vd\?Ys2KecUp-^$TB93QY@[]UrjeE9Ki^TO]Uih`HQ/N](73jBko"6'@04_QbKuo-4d/QrC!(ERe`,O-.SRNM<:n!-[:t9G@RSWLHf@Lp>.u;/!#_\=)#5A=#m:E>MWp^22,d6TifC7Q^&+5Rs%5#]$e=lSX0/h>Un9sW^iAqjhUh>f1r's0#p8$,H#ESKBJXr3;Dc%WJom)^I`FSqA\gAF-leYC=3qL[nkK5icUQ*mmVU>&$!.O>37A@A>hY]Y+rg@61S#Tg?6fCQl<WakrEJ+ACXCp;>oQYX)d4'5!"6=f<*;Nb<=n]/NgVH_ja.Z0%3FdrC<2XZcff?^1ZQGI.a%j:X>0KfgcicXs]]`,PTUA\sc#Y]'oKrn!W3B/o./cREkQ<hHN24gNHeYi-j&JDNQ+*kMLKOD;TEDWnlM,Z(%dC(8]7KB9/20%W'J)n,K38]+.BA?Rq:Pk)5)Cci0kKjppa*R$Q94jO&'sr`lj@4F9g$MlgT*S$+r$Z5^g/4oK0:kI,.)hW\5$B57.c?`W!9?LN>d^%CCq4L&<E?iUZW>76XeD&;*Kq351lghf!i[IA@KPKXEdpgh@s/sG!B!"]&!zzzzzzzzzzzz5QCcamf:*?!7f3&
rcs0 --- user = 0x00000000 f8208000
:f'SuP5f65L2t=m)+Vh,=&6.t="cTp'1\T8Oa(Ir!Ai^2YYLIY+NXB(=rS8nT\\oKs00,5cD,XE#.!0/9jD]VH4ZBn476mI4qH^(^[U8JSXa([\'$ka.fCZ38[ghK/GHI$7R]<1H8=no4jm`2c./CrEDi%(_pZJ#1bAuKhjOa)<#p7PHX/?L*s1<aVpn%)).r`2Rp>gA>UX;-"9O&BT/O\gpNd8@VRHaRk%K1KkIlO_JS>Mh<oAbeE"o`pSXd:^0Y%MDm3]Mtp)>bTY-'qgra.*G\nc`$`-Mo[\P%J,]qIo5<?IA)s?;/H$1&47$\P2QS1Ko6F.;eb$;9J26l#M$$XOiU3T:.9WDWCRu6ru12YPDQ""Kjudn)[]t!!!Gb$T*inh7J=>I:S2<!87=tzzzzzzzzzz!;Ycm:Oa/l
rcs0 --- user = 0x00000000 f8000000
:>j\&+`uJnil0b^>iVDp+;JZ&HiL6_i%K7?/C)L/'P&=J<ZC+7H<rras#g,(;!<WB/9#00_/[P5H`mVID#W@C;QuX2Un0gI#Z%LaVMk"=U"+u]t%RZoM2?LkX(W8JppYE<r];MRldi"\/mF\Y#2%S%=lLi]`oiK[DP-S0'<nSltUZdkt+S>tMLT%g2a]$kA>)lJe:?A0!aPN,T(#hBihs);[U&4S;60]6b@K*t>`"S^8.I6Y=4H?&4M^MNo,b[G<CQ#3mUS:TRJVc\,VBn.s&[*[aaB%)2[t[eX2mm*bT'\Dnf5&DX-S"5WgJ`$*mab-5goII%pfI>iQ9b/V;.$_0XR9*3X1"lg9RX(6G4Mf:Q=,d@GEu)!b>OsIIBD@+GuniSWar!1b"b-&Teu^orI*j0%/s]>s05,mr<do&Z5JVFn;#/YQ2!!/BBRC$b4'JP=6r7&W)c-WVA1m!]W.hBA&n$CjmNL$XJU1$GSSicW)N;5Z]C24Z:Q)"l'*Li?aQWNd@sO\^M+:lNGVEGA/pFiG$un.@ClNs%lbFJE/NOLI;u*s[e7d)iK!TV@[a(eh7W^RF`RERGkIn-QFab/<>ITK3@Z-"ZFI8.`m&Z2'SY!BK^4fC7/[CgiMNCqF5SR])XVN]?D,n6pW;_:Je3mt#(,ihhoJTB4Uq0<&c3&^Vn1u^lVWs5"WL^Q^5M8sJY>5#PLRetU\rd`9_uk'cr9OV3E,)OmsYW=p`V+?b":;7)t7TcP>)(3Wd]]._4U0a4C`neYFqnZpWG*]i@]+OF*YWKBDI_%npTF_D.adp@FeFHLm?D[*WUD#?M^;RZ`%L^Q$WpM+#PZ[<P(_`4)f)bgVED;Z.]=UYVdGpe%nSGDGE=>n>B4WEJ%FnZY/N"L!qDakC-T*puA(*+k6E;^ArQHLDq>orPD^?&+G/A<h6b*1[eqAAp`2m<1dARFfjmI[^;k[UOPP/l$Hdi^RLYj3T'`4XXX>Bf,GgLmqu:B!;IH?<m=j`7";_499j/iGG%p24RUXmqTI.5T`1YfTYTaW3Aho5KG9HMet^E<U$g+&iU5-hdZgrhQ/.cUO*2l3WIMDl>!BR*?.ejVqCT<E41#:3KkKZqekCeRrYfutq9!RGlT2PqC[q]@&&Ac2e,MEgN5e<TH=8A[PF`o0ohRS&Z.$L&'@SAb(]*0%1,JW=[GR=5LH(d^)ab^4K_M0;7sYp,UdAq^4[iC9Yt:#=3lIrAGOlTB^@bu*k5UU)brIlGj#&^mI=K$#I><-iPmd9rO<.iMpIFTI^d#ea[8h?Rlj-)]gb^Alm@?pX$K6Xkg[6?H>U"Bj`qsN>\/p.EC\RqA%Fs_^TnM==r'EWF#0PuV_G++]HN9A=GO]qGp!8/`phPl.=aGj.F5J@HS0Rdtr^(oIS1iggb+stXQ:A?+>cH%HI!EJgX4$#3l#DH1(1t\?I_<#,oEfSUk-$:f?cDDg[SflWRpWt[gdRmp1sT>#&!$DR?X.Fa\2Z_+1A^$E.o>,fAON.^^+Ko-W+`[OLYHJ"RpE\AC(:)3idQiAm04qTM:bDPBo1RGrYTgMKa+0DN&ligeQ9s&McsX.*-^KZl@.jmpc.u/:g\[00`M%TZsUVt+'L_3mtNe<p4<n(CLrM-Q:aYc^S+S,Z`M1UGj`TbNU%!m$/XI;^;,+:Q(KLpIIh&1kt'_"8DcCL_]0]/Io1Lf5;W"*9h4p=cWD^C=N^'eG@f!DIG._J/Qh_Zo\Gj2:V.9f8&*hm\G"aT[q"9;i>6ZlpLk>\&mqT!,suHk:E83"2pPb@Ip(=A!O_h73=2fp"7O_=&u<804A@E)SoXG3h7uJEAt:S2V2XYb]D.)0f7$bBcl:lY?0GN_hM&G4i[4L7?cDE)YrTks3lG+Fn)bb-IHo+HAc)cR!q(EqR`a7Vp&>!+p)WHB%+p7si^GGKrZ<0L<PO(<ho$,B54G!_JYd;C2j9'4>F1@mj0prK+3hh&\pWI4q1W,,e#"d]a.8-aIOpQ-d2[Beq'sd/?4llY/=P$?"7H8?!c9Xj&DUd`RuY!7]VSk.Y'@!BEg:X.o]&u3mHVish>MRDWXnMC8sCFQke(83!i0$RNu;0qLkrP==6O-98>X(5dql;d$N=1.>c:HTqu4BT"O?3pC`Qg54hZH\'kgCcas&e6KHA9a@mtJ\G^?gkoKM[@0V>[)L&O12H3FkeXf#OqQZ>O3+SaWTFSOgT<GgS]r*+[N^]0AS.an63^D1\d_uGV$?]6<+s5j$mM.6C#?]F@Die+V(UA(N"aVNng9C[]pnV"XoKYJ?sr,>=!G@//6o2G5XBn^f)`EEA"`IALP18aJ"I2UcCPdeg[e>'DQ+$;)N[><@']'E/CLA<j0=eCBYnoD[?]KGO+f,%F-K)5\"%.j=ur9PfLoC8lpo>[BrM8VJM",q&+V'#V+L%tY\3nkbDF`p",:*Qm(qQXHK.J!Y`lBD6!([A@u;oJRV9U#K=,#A.,Ps=gl5P$IcQl5@[2El&9__jG&Nj1k@r`PkJKcoC\DG-E2=mlcJGN5L0Zn`/XfJE,BF`,mp5IVs:d@MNq1d4$sd277!XVSU(Cc_HWa7Y+>^V1+5^GZtaM4-RWdTE.)_2eKTR_&#Lc'.bX/`h[9e@1PtM5&cnrrY^""tksDo)&1JEVk3OH,R<W/-X<!nTTpE_)"p_&)!G$Du4Ks%E*ML/?D%L1sCHYh,6HLSNQU;;npaY%A3p2,3kN@I#G"3?/dK9_nPIX?78#(H9[o,6UU[=VC1uu)IrU7<&-RVEK?a;S@HrF55r'!h@e3$bMf/m3ZP:ETCXI\Mg(_.HIL_nI+*S9p`eka?9ggTrV-io'd&X5_DcQroiIr/#a<ZqID1uer7H&"rG>p'>M<.#=;U3$RpI<=,qnHQp?1odIBouFrO[1BAA=CJ]F1EXa"!f;'!2LlQ#Frs5BUeWXdN1_hQ]iMFn=EtKls:us1!.=*U7Ro0/+?'5p&q4Jis@OMUC=+h^)sn(ES&Wf*(^@^7QU]3dg^Hk>Hg$6W#fAA`1V>8&L,O'-hM%S64Qen_rh730ut_3T=g5pAAI+*gMO#)X>$kos(^7O1!?@0EkX`X5FFm9!=__?1,6>GAHa,!n?Ou%iJ`8pSjZ=HLkZ]V>CmYT\JVajG0'PiWT(ip]=6cS+oLReR%,`'h7__;\X.7_#%!qGcZ5hDcK"Eq`R^.EBA(HZ>-:NSY.Mn56+%F&/fp#r"9lr^c!o;n_?J'qrf9Jb'j>ca_]jh"t:Qg?@t<1Aq]>RFlV2QSTq8oUi,atoM_q"01@qm;=NVLDScdV\^"8<8]r1Aa(r`-0!!FNRqJe6^p-&Tm3t'oZh7fTckj;8fRQW_M,/;Gm_[HLkNSt"A(aAq*]&7cq8g!ZnHHJ%H-;5<_Ph_$o@"-78'X,Kj:<?W7m[i`2MK_8J3WITefd)8*Farsp%&li8rnQcGcEq5fCpQMMeV(,ag=ZQ-bKUQd^#hI1JXPn:S$<AWfC"2A,@>L_$qJ+I>R:MrV=In-?Icac<je7".sHoIMp^[2#"fBmfsZAH1l[fp`B%rcbgh%Q@9?.jL;VW>RO@h^UWFH:\TJ$UERItaLo<iNTXh71/+G>`aok!Hfq=(]`c)/+/Sj,UIhP,T2,\t2)"Cofur@;P33X=qD"n(\\nkDItsAdk0q?2"874li[-a*"Km\tH-Tp/#k,U`I_B:,:XZSTVG/_6HS_7]i+mPupu7a#$J3,9plSVTo6DqAo5_icM(,"oN4"(4j)Gu8^[I5aaKCd3OAXPNHV0=l.q['1*<&-[[GGZf1#Cil,W!1gh`52]3ZS+W;pY0scAp42QB-MenAP4[8B:(i3`<6MjkIfB-91rNrQQ_QOq6$iMt_S!'$'?!rIHjpPjcc9Rdltj90SBZEK-gm@OK`Mp_mN.o=CulNWinn&p"`$mcqiB=ST[Zq#'B:r85Nto2",:KR81]G;pOB.EChpSYt>LS`W-/kqSID4c>%2;[[dNdneaTC#Np8)n;A5]7Z^Ej`_N@DW'dY.hFt1EbYUFHSB^%VH*N&GHM?u,586_JGDLrE=^#U8Irk*`D07ZCD/^Q3sZM\41mX>7&2K^cQaT^/FO(pr9$$72$S>br,+0aQf$[+cd$KJF+\kS0tp,+3=YO0(Dq(Qn6TWf6c`34,<NWV?g/$j#5Me:nm-M:g%ipLS7li-LAANT1;D[R#Q<]Fs*5OumiY#`r7H6Y:[E3j6B66G]d2,idE^Mdp]CAdjnMS^#MnINHS7AANr6EZjn=.E1\7+Q@9(_8\SaQs:6u:Y<;p2rI45g]0+ODCn=!BRgQa)UjlE`A`H2d:QZu;m-dustra%jhnbc"<pV^3ap0dWX6@?p-0(Vk!9.eK%?#!HQ?t\_-OEkcR2-7CTdYlH>>`rl?^_>i!DY/_PqU_l/+tdK9qLc..TXF=r26W*3p:NB\:RgO\I%F7Z'BE"W_*2Bf'BJkURF`6-K6_LO>cnb'$n'7.F=l;T6N,97:QQP,q!/XHruGSGlds?G,VYi75FVuNrqcWP"S0"o'BX.!q30Y:m*[ruC,M5>!CQ:#p^o7Ij+MA2f+@sl`qq!o&t]&]&p/nSk:`sWr9$![hZIl2NP,/kp3m&23RdJCkL=uGr9$kl]ES:nF%]\K>Z/UlBs?#5oR-#ZYts'&=oOIu"95!bm`kCo)qG`uqHp:Oo057_D*/h^c8hMe3+eFUH`\AknJH.`c,G=BS2WD.On&5;g5/T5qjJP,a#e38kW;QOcIa"l*N-9L;t,hFS>YPqT:6Mddk'IWq)MsLbl$X0X5N(;H"MMH8+`&;iH(0b`.[4$)qsPU$^0ah]][IF4.PU2fPDV6r\?[mnom+Dk<?k5iY8H0YI3%`r(cE7Sb[9NhAu3n\hE*ic;aE6d:nfNG04S2/uKBOY+0s_Db<JNX^V(:GK8r):TXKUO42e[]@fTp+0hVK1So2?1R9,enXf?ucV%J7@qgE*g%Co+^*>j%4`^.[QTa+X+aa"D-<Hcj\7RkbR;R&W$^J-a?IsZH?>9:X=qr^MF.D0*^])6%])1&2giZ!VUo084;D&enf;ZB5lVH;o;o7:U#4<hlQZ4CcD;8H2G7gI;GUh*L>^7*6;a(/'!R:(FI]_k"\U1fg%p&)S;h!oP'n:G\c^f:OLMG]1P,:mncR>q?YP4,Y`pN(CYO;8mkjKR%qR=%W3k)VN[DjTHBWJ(<gE]#`pVn9q2ueK!e,A`W.<m:nE5ROMpr\"<\aXgA3N78Chk)!#I(Z64Gc0sn)#*),(DS"q`(X-X:P^HtpLKZ+l<HbQLQ#.#)8#%:dXJS7$=U-sT$akU5Cl2>LO_QZKpM8gn+(0VJ&odr;MX^dPN]u#<ep+O<4oh6[dd9ZOEQ<k-dE)!'YM+I/,P&\4(\@BLV/lLB_UQ0jlIQa'R]lViE=Y([3'ZA;t0IMINCXX,MfCM*`MS6^q[Q(pi%;Aa`VG"M.K?#nFDp$rh>&/F0Bj$AKM)[+fP25Ygjg;l98Lc$9ftKO,%Z?jB),&ncB#jI[@PF+$H2jnSo?;5(<?*r]T(P`sP"JmodYMGf;<G4HTLc%jp.tjIYiU)5O:+<M<D'ePptkqOugU=]Ko*H@rfa=uY8jSrNIYeiNe%pUm-V?\2ch!9ZC8hD`1SM`U%;CWS.Ep\_:dP'm37%X?l``V33o>!2BU8*f8Do!:EJV0KqK??7bYQJ^9X_8a%I'X&Ts-G3R(l0j9"a1X<_ErIab;Pktb6-!$&025+6m3,HT+4O!T*MLH%Jl]XBH$bD&?f-Sbo')/X'92FMNsP>Vq[;H=h_-/5:5=\e5HOb()+Adm<sb$C-972nG-l80dTTNr*tsISRa8T'H/6#0XO-"LqTlqDB3J2[EIa>MVtCaoS=BH<Aqu<TZd4C`HWg+!'CO9UdaaDdlYanUk]i;=c\]n8AR0;hf>$[bU7_,dnUV]2Nr6-.0,`_+Zh4$0!X=F=IKlbGHcUH<_.E;S5"[CshnA$Lhoj1=Q2,`;/IrmkFl/CTaG0T]q;C,m#CkE2kPqg%#G2f4S>uAE;rmYeOH^`/=8C>C033S5,i9?F!eZHc:iV]U#8V#V^?(=$#'=V+Gl9qHpL)&AO&396cl`5EnYa+fh#He9[X\#e*M<;L=(hPQMqS-c&-)DG;P2k:pV$k28c>f94CY)@at6?QRTlQ\/Yi$b<-WB,I/)IG>q,LN^BRX'gul%o5@CLtn@oXKf*V?PIb#tHn#uAEIYO+/ofMl"QY5n,<;p9s@B+appg`4?:I]FGK_tJI\NBX0l\hHc+g9i*\VCE`l\ojJrPk8#h:\&IoV;@8.'%dU>gg+5I<0OLp@Z9aPWRJ&f.>bD,'"9B:Ik!C<8Se8SLXBH?K0<.]!S0-(SBsDPTd;e,mcn7q*IoB0.\FLh=i4qD>]MD=E.b"aZf0kq?Mhh?Ys`Rq@12lF1//opn6cA^\?9n8g!tJ&qlr,KV9edTdWMG-qY,*8eQfN&qlr,KV9edTdWMG-qY,*8eQfN&qlr,KV9edTdWMG-qY,*#Q@*:Wj=#(
rcs0 --- 38 requests
  pid 1360, seqno       10:000201e8, prio 4096, emitted -84ms, start 00005000, head 00000c00, tail 00000ca8
  pid 1360, seqno       10:000201ea, prio 4096, emitted -80ms, start 00005000, head 00000cb0, tail 00000d58
  pid 1360, seqno       10:000201ec, prio 4096, emitted -80ms, start 00005000, head 00000d60, tail 00000e08
  pid 1360, seqno       10:000201ee, prio 4096, emitted -80ms, start 00005000, head 00000e10, tail 00000eb8
  pid 1360, seqno       10:000201f0, prio 4096, emitted -80ms, start 00005000, head 00000ec0, tail 00000f68
  pid 1360, seqno       10:000201f2, prio 4096, emitted -80ms, start 00005000, head 00000f70, tail 00001018
  pid 1360, seqno       10:000201f4, prio 4096, emitted -80ms, start 00005000, head 00001020, tail 000010c8
  pid 1360, seqno       10:000201f6, prio 4096, emitted -80ms, start 00005000, head 000010d0, tail 00001178
  pid 1360, seqno       10:000201f8, prio 4096, emitted -80ms, start 00005000, head 00001180, tail 00001228
  pid 1360, seqno       10:000201fa, prio 4096, emitted -80ms, start 00005000, head 00001230, tail 000012d8
  pid 1360, seqno       10:000201fc, prio 4096, emitted -80ms, start 00005000, head 000012e0, tail 00001388
  pid 1360, seqno       10:000201fe, prio 4096, emitted -80ms, start 00005000, head 00001390, tail 00001438
  pid 1360, seqno       10:00020200, prio 4096, emitted -80ms, start 00005000, head 00001440, tail 000014e8
  pid 1360, seqno       10:00020202, prio 4096, emitted -80ms, start 00005000, head 000014f0, tail 00001598
  pid 1360, seqno       10:00020204, prio 4096, emitted -80ms, start 00005000, head 000015a0, tail 00001648
  pid 1360, seqno       10:00020206, prio 4096, emitted -80ms, start 00005000, head 00001650, tail 000016f8
  pid 1360, seqno       10:00020208, prio 4096, emitted -80ms, start 00005000, head 00001700, tail 000017a8
  pid 1360, seqno       10:0002020a, prio 4096, emitted -80ms, start 00005000, head 000017b0, tail 00001858
  pid 1360, seqno       10:0002020c, prio 4096, emitted -80ms, start 00005000, head 00001860, tail 00001908
  pid 1360, seqno       10:0002020e, prio 4096, emitted -80ms, start 00005000, head 00001910, tail 000019b8
  pid 1360, seqno       10:00020210, prio 4096, emitted -76ms, start 00005000, head 000019c0, tail 00001a68
  pid 1360, seqno       10:00020212, prio 4096, emitted -76ms, start 00005000, head 00001a70, tail 00001b18
  pid 1360, seqno       10:00020214, prio 4096, emitted -76ms, start 00005000, head 00001b20, tail 00001bc8
  pid 1360, seqno       10:00020216, prio 4096, emitted -76ms, start 00005000, head 00001bd0, tail 00001c78
  pid 1360, seqno       10:00020218, prio 4096, emitted -76ms, start 00005000, head 00001c80, tail 00001d28
  pid 1360, seqno       10:0002021a, prio 4096, emitted -76ms, start 00005000, head 00001d30, tail 00001dd8
  pid 1360, seqno       10:0002021c, prio 4096, emitted -76ms, start 00005000, head 00001de0, tail 00001e88
  pid 1360, seqno       10:0002021e, prio 4096, emitted -76ms, start 00005000, head 00001e90, tail 00001f38
  pid 1360, seqno       10:00020220, prio 4096, emitted -76ms, start 00005000, head 00001f40, tail 00001fe8
  pid 1360, seqno       10:00020222, prio 4096, emitted -76ms, start 00005000, head 00001ff0, tail 00002098
  pid 1360, seqno       10:00020224+, prio 4096, emitted -76ms, start 00005000, head 000020a0, tail 00002148
  pid 1360, seqno       10:00020226, prio 2, emitted -76ms, start 00005000, head 00002150, tail 000021f8
  pid 1360, seqno       10:00020228, prio 2, emitted -72ms, start 00005000, head 00002200, tail 000022a8
  pid 1360, seqno       10:0002022a, prio 2, emitted -72ms, start 00005000, head 000022b0, tail 00002358
  pid 1360, seqno       10:0002022c, prio 2, emitted -72ms, start 00005000, head 00002360, tail 00002408
  pid 1360, seqno       10:0002022e, prio 2, emitted -72ms, start 00005000, head 00002410, tail 000024b8
  pid 1360, seqno       10:00020230, prio 2, emitted -72ms, start 00005000, head 000024c0, tail 00002568
  pid 1360, seqno       10:00020232+, prio 2, emitted -72ms, start 00005000, head 00002570, tail 00002618
rcs0 --- HW Status = 0x00000000 ffffe000
:bjCpF+92lp_SH<c=R#:t,SP_[P=9(>-"_?Jror`Y!&s(5DYsJ7!Z3]o!!!!/
rcs0 --- WA context = 0x00000000 fffe2000
:c0_$G0RsV+^YskXW=.^P7ML#2Q&qb-X9QPC/L:P<pC[e8Qaq0$)o+PJ^n3I,%il!_1%ZYoa(lF0c[9\T[^a<Xp8Q,*mF<G?$ejl/&J5Teq%42N"=+)u!!&8k
rcs0 --- NULL context = 0xffffffff ffffffff
:h!LVVpJY0)?h)1M)FMG0<,*O4UJuc.hNhcJdE3hW>*b(%%aqTHf\J#-p9fUM+=.a@<30%[0bm2qU8_2)NFK:t=(h@HmBHUo!EH/I?f_A16DC.>q$GgHrFjZU\`_huX7)Y7jM*eAP&m.`_#@)M,jrZNo1.#7Jl:X&Dk!)<NoplG^fqX(nX$XO#Y]<>64eenOG"b_j^T;1bV'aWBB\KJc:.EiDT'`@doViq&;1,ZKHUUfs2[M<k%]@CR)BjUN;W+Zrfs?%>V'<?=O0[@HLme-rgE%KT76\Yr@lFpZoq=MeLk0O1Ac4X(ZhH??S#^tA\.&J6u+ddcpLXY]@bmL6b`J;CpB;:A3Ve_qU0*W99-CFCHL^LIFuFj4)$\.9ohlD(mc9n4<;sBDb94pcG9/<_>[m91QZ%4A3WA;O&,2g_aP%36r\-P1ap`r@mQ(m*],k(d1\c>9c5c5#,:9L]f"%k+lApcd\WRaNtm0)ER^:e*j4POU&,hneK<9Z6R]dFWdq#_Jf5Y+1f2Tb77Rdqa"7o\4UcZ9m<>.SIQEPI?eRu)TR+Qu5Hr93<<5oE&(G?f<*GsF@A8L;U+/-9Fe;dH'sq!)TQZ@/pY:#`W!!$-F$e+`Y)i<^kOTF0$)mZnQfGkU^0sKeN<V4Q^1-7o^W0M6URgrdMnAT.+)CCOP:;tJ<S'a$p#!rq(\-gO46LOKW#jXLm1\1qlT&+u\^pd:gTR^>@r:,5dN2P*^[<UuV.L6TEj5I`AZ$NfWA)hU;UO!G;6(O6qL_a3(c5EkW$.kb_aP"U6r\-P1ap`r@mQ(m*],k(d1\c>9c5c5#,:9LU,<B:RPnh^l_<No+#H+,U$n[4\e/V0*f&PjAYBW"3G@U>'E&>cK09indAod/g+r:=>=DkST2P"&kCM?Kk8F-,?@u(gX3hkUG;JPuIaUIK.[h%>J"6g-`fQ)q5189@==j*^:\nCtHD$"J6Oa_dN=f%*B[EMB7?%L.1jIC-P=/+G'f9IJcl.h5Ar+qn%VXOh6`u?9h>GXkh4/uPC$QRpqe>PEIC-pT?J8j1=)C&1g1A!qlX@H<%+>J=OTtJGXKI5u7kaVoN#5i>T?oo=c9OEMf:-^Vi.(EX7a@<B3]M;M"[;OXpOMktNRJ"bSEh7^\.+)Jo/V80mQTD`crf,o*S*SK=[PI74Gh*;nGA7.ZL1Y!Yn,\tUcSOh[JdfKpbt6,Ea3V1Z$SCC?+CL&V<O"h#(aM?_Rnu0B3>FVa(pDeCujo?UX^NnrPHUc4jWG:oU,Uik29\UZ?]4.Na2<2Q[7s&Nq:*MnP!KZ((,3?o_[6Zn3,*,p6d?fpPin<VC5rH)[;-@s))u!j_4q*EM*'&kWUY)9Oo17\TQ@bJ"Q<_*$&asW`^.1$Ki&^i=;KZNEEu$a;R)8CDAb<4)jJA.lps_^[k*/EU+V4E"rSjf=_O)XEKR!ZLa&O'tM>Y<%>lhh9bGHWq8L=k6>d&jj#`cE;JOI7#_JZ1hb72P<qtU#./-m\]0TA(:6$s*]A)Ap>a3&K:^kCqfTODDqdmr5.p0NlCJFmiu9S_HhGqi5?la3V.tec\iN?PooJ>/F8ql:q]`T?Hf%"1MuTA/,=Hn,9W:ME(CiSYc5u-hV<Xn`oh!d$2]auC<p.+;m`3#N@r@2Em'tfF9]sT:k%!:tfN1gsd';%!MopH3(A1@Y7hKP4f6uiW5l>HdaZb)o,(A4*D8.A[NA';/Y6nX6jB"h5`4K@*DOl!hG7/H#G4Dj8A"!/<!4j>)77hr>0@A@kGrfl?-F/b5e%sPXR8a>[Z7&2gA5'a4IMO*L`gGA+Z>o9Fd+KPWPh'ghp@=[+;YQ6[kkBL?05n2J_qh>o>dr4,/`_UD/UZBteE&'K5O/haqqmhoY;pkq][M4pruI7!CC0!II3-&t+=eG#a/2;-00dcdf:)7@][fa$oqT+12-J7&`cpj#0k@c)rmm][d+=[%RJC#PWg6;h8cm[Q.=9B8^H<3;[a39%S/2sJ7bM9Db89)RHGtYbkG9!flTArtCA@S%lkUBgq2T<:2DP<t<:r]CpL@pBg2h@n4XI-]2JpUUSFsGLnekl>k1MkMd>G<RS_i*Y<=?mAYsQ+.AJnjGfQF1m@i,t246`IZL>o94H+^<37uLk#C:iDUo35^0\R8_H(.,4/')LRoX)1:tK?Qq$Q:L&k:`Lb!@(CWFbcf+Ep3oZ@><8X)?>>@pg>oQIQJK(KlO4jC%I3l>e[l7U.X3f?Ik?Q>;O-M9`cHEi@;.0j_$Pr-gJld1Ik0:-?J>3i&diEA\h+pT^Kr;X+1ogJ"J!DE6XGMt)qnC0ZrW&'O]YCI-mLsdS,6N(CK7M01F\sEanjR`2$;DeQ,Ap,8DO(#[?kcN4mCu&]hSM$[l@81A(mq(nS)sOoP^7"#qnYXmCAftqfYL+53J_qpc^mr,48r6dp#s]OIFs$/mbWa?HhJWgEVa%f!p"ZjYYi4ja,daZZMfDRZHa>f#:epppM(ej[X4"FGI9DLGS"<C_2Wfjo`3W9>18'74VnqpV<tl/WWk1r@_sR\[4QC]6r^T4T2P(oQG1:>ee*?R]14qFaeX8Ef%Y+]-?3pjkB*L^,%'D]eed4U$l8N[e9/Ie@p%ElKq2QB+'i9RSk>5r%'MM+Xk<Kf7m:=ed]U=G`S0QCrbZ75%B80lQ^,sS2ZJVcus[/;T*'Co2B$s-1n4;hK'GO>#d-t9",a[SkgH?YSeEq_<H:j8([2;*t?KIB)YlSm/+B&%_![8J!mPmZJo]4afKEsYjA\IoC*JYNe8:N\k@%JBtRgJ#%D[7>J-G4^[sKl)O(+VU[=8hBCj>/mkcMB2;'HkMoOX)f7V<=%mfS<lR&j>l#U=uYPkd3qq>-!o?JlXT1A0s$dEDkhNA8iX5`$<hSG,3g><X-<*?scR9SR6Gd\86PL"`XD<Dhl3f/Ob,WA"B2\5VoC(L3]^CHUOq1h]:D9#sKOE'N.Z[nCB#L#M6p8tAE5qBBrQi,l07:MNtnP=:a\UT*(P%Q8ZD6#Nl\%f99c_n.XPk62*[Sl_kH?e'NVtu54hRSmRYYq;Qh5=A_eS0uHY-_3C".&FL^RS62%<4W&7K-N+7bJCRFEG4)ST_njY`Grthd:Z/[aAeCe"r&a;^jYTr=H+b(*]4tqV>?tAVBc%Ff:D50=G2JIT@Dng7biW3K,@71YL*te%.]VF^NUEQ85h";&a7Y\\3B\2ecB.I2q-5fRCFhE8A8iJPu..C_Wfo`M&3!gfl@BX(dlA,h,`rk/P>D]k<cM8gD:(o=B/sM<uE2-7)elV+$Uqq:GqZQ)c,G8>"cdme7DgU<<79hlG(_p`Yln8oM]U89'-;X4ou7hB(c/&ES;@dquPM2R^`t+%+Seag$(>T,0HPb7^;3Ri,m?l>"HfjO],=%j<u-c5i^jrNn*3ZS\hti1_Qtj44n9Wsd00:b/+'mCDW7("sfSAbbTOYJjLG-"lL\f)pVoj)''*#NK#YfbNj1`V8)^/Xim5.KaO%mtIhnm$b%%]1f%;*M9+Fk/"f@2P?Is#]23ZX`$o^BjPX*kDAl%$e97.<uiil:%k\..US--NG#8SK6V5b9rMeK(>H:,5po73#J_SIk>nD_pp5f'gMPO-Dn/ur-o%*_p\NNEs&/Ktb:RdieG]:]j3^?JlLg$R^:gQa:<;n>UEIMBjdf(fjg09p;+GbWfi2R$gGcIHfUi=`+!3F/*L2?-;TQ=0;LI]>p'@=fHnT+*K.XlECqb[ADr+oLWegJ.C>A0ZSp!igaZO)O<]&fVD/S!T'q"j!dB>`ggt+I_7mKiCn!i"l%Z,%59aImVIl_Hr=4^)o`Klt$XONYaQaPFV?Q>;C+VGITnaH^qZH7JR7cD)/Xn4*$fQ6AB?]T'-G]l$9Xn0MaR9^.PMd5eV/,0't[C%Xkk=W$s[`8Z)q?,#)a<o6-jg@R;,:cKflKi0Cn]]:XpAtrO0Q/SqS/aFDj][o>lI3TJ]]f:BbboStNULFgo8>12W$hpe\=/D_XR=VP=j\D\>7XB[S<&l/HE;)B4bDSE],;*6N@llF)IN-:hCa_\?r[tF]eL5Sb>I54iUlpfq!Np\@/S%g.@9qP<!pgo)Q6Y$W&6s8OeO<iN>`LEBX+5M)NPdV)`0+nR6<j\2Wp[ocb6L:DLLO31=s$3hQgZsHt)E4+UO!eQoqYR>47LBE5=5oA4E!-i3B`uNO`(J5@\T]D8riiei*!`h1L]uEOS!Kmo\>#)g)WK_i;3^gS2^D*,X+`aG(bTEQ6gD[s6qN?2K4nQL^EagWpG_Q:+MUI82]eF%c2I*H)l9*5'BWZ(-[Jho#Je-MR9T8L0@,r,=@YPO.R.TAcM\=5c6MF?^a-O?2Ih+0M9J>t&q0C[78k#l5hg][/_)pCGkQ"0SE27J-o3"0S;D$ecu5%_@Ye?YDXI3pIfo"/G`iMc9]'aXaFO2TH$NT6Tb<NHrIN'i5VH;#Nk`C6.WhLK%[/1jYgL_a=kI7#_dU1hb72j$eq3!Ao&Jd$$jlSJ<tl1sd/!Tk9,1"W>K7<%=Oj)PR"eU=C@8%1]>Q-tr9>UP=LA7Yr$-$u"%^TuN!/RK@0mae:&;(HO$ZW+hn^F$e+`6`dffB7/(t/hibRn)l7gWb``M'E>JVKHUUf+UCCG#XT)U64een&;224KHUUf+UCCGr^%0LJ,VDbpT[/#m5<1]/N=:(64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf+UCCG#XT)U64een&;224KHUUf!<61!-=3L%
Num Pipes: 3
Pipe [0]:
  Power: on
  SRC: 0eff086f
  STAT: 00000000
Plane [0]:
  CNTR: c4042400
  STRIDE: 0000002f
  SURF: 0d4c0000
  TILEOFF: 00000600
Cursor [0]:
  CNTR: 04000023
  POS: 043a0e59
  BASE: 07280000
Pipe [1]:
  Power: on
  SRC: 0eff086f
  STAT: 00000000
Plane [1]:
  CNTR: c4042400
  STRIDE: 0000001e
  SURF: 07300000
  TILEOFF: 00000000
Cursor [1]:
  CNTR: 00000000
  POS: 00000000
  BASE: 00000000
Pipe [2]:
  Power: on
  SRC: 0d6f059f
  STAT: 00000000
Plane [2]:
  CNTR: c4042400
  STRIDE: 0000002f
  SURF: 0b3c0000
  TILEOFF: 00000190
Cursor [2]:
  CNTR: 00000000
  POS: 00000000
  BASE: 00000000
CPU transcoder: A
  Power: on
  CONF: 00000000
  HTOTAL: 00000000
  HBLANK: 00000000
  HSYNC: 00000000
  VTOTAL: 00000000
  VBLANK: 00000000
  VSYNC: 00000000
CPU transcoder: B
  Power: on
  CONF: c0000000
  HTOTAL: 0f9f0eff
  HBLANK: 0f9f0eff
  HSYNC: 0f6d0f3d
  VTOTAL: 08ad086f
  VBLANK: 08ad086f
  VSYNC: 08770872
CPU transcoder: C
  Power: on
  CONF: c0000000
  HTOTAL: 0e0f0d6f
  HBLANK: 0e0f0d6f
  HSYNC: 0dbf0d9f
  VTOTAL: 05c8059f
  VBLANK: 05c8059f
  VSYNC: 05ac05a2
CPU transcoder: EDP
  Power: on
  CONF: c0000000
  HTOTAL: 0f9f0eff
  HBLANK: 0f9f0eff
  HSYNC: 0f4f0f2f
  VTOTAL: 08ad086f
  VBLANK: 08ad086f
  VSYNC: 08770872
is_mobile: no
is_lp: no
require_force_probe: no
has_64bit_reloc: yes
gpu_reset_clobbers_display: no
has_reset_engine: yes
has_fpga_dbg: yes
has_global_mocs: no
has_gt_uc: yes
has_l3_dpf: no
has_llc: yes
has_logical_ring_contexts: yes
has_logical_ring_elsq: no
has_logical_ring_preemption: yes
has_pooled_eu: no
has_rc6: yes
has_rc6p: no
has_rps: yes
has_runtime_pm: yes
has_snoop: no
has_coherent_ggtt: yes
unfenced_needs_alignment: no
hws_needs_physical: no
cursor_needs_physical: no
has_csr: yes
has_ddi: yes
has_dp_mst: yes
has_fbc: yes
has_gmch: no
has_hotplug: yes
has_ipc: yes
has_modular_fia: no
has_overlay: no
has_psr: yes
overlay_needs_physical: no
supports_tv: no
Has logical contexts? yes
scheduler: 1f
slice0: 3 subslice(s) (0x7):
	subslice0: 8 EUs (0xff)
	subslice1: 8 EUs (0xff)
	subslice2: 8 EUs (0xff)
	subslice3: 0 EUs (0x0)
slice1: 0 subslice(s) (0x0):
	subslice0: 0 EUs (0x0)
	subslice1: 0 EUs (0x0)
	subslice2: 0 EUs (0x0)
	subslice3: 0 EUs (0x0)
slice2: 0 subslice(s) (0x0):
	subslice0: 0 EUs (0x0)
	subslice1: 0 EUs (0x0)
	subslice2: 0 EUs (0x0)
	subslice3: 0 EUs (0x0)
i915.vbt_firmware=(null)
i915.modeset=-1
i915.lvds_channel_mode=0
i915.panel_use_ssc=-1
i915.vbt_sdvo_panel_type=-1
i915.enable_dc=-1
i915.enable_fbc=1
i915.enable_psr=-1
i915.disable_power_well=1
i915.enable_ips=1
i915.invert_brightness=0
i915.enable_guc=0
i915.guc_log_level=-1
i915.guc_firmware_path=(null)
i915.huc_firmware_path=(null)
i915.dmc_firmware_path=(null)
i915.mmio_debug=0
i915.edp_vswing=0
i915.reset=2
i915.inject_load_failure=0
i915.fastboot=-1
i915.enable_dpcd_backlight=0
i915.force_probe=
i915.alpha_support=no
i915.enable_hangcheck=yes
i915.prefault_disable=no
i915.load_detect_test=no
i915.force_reset_modeset_test=no
i915.error_capture=yes
i915.disable_display=no
i915.verbose_state_checks=yes
i915.nuclear_pageflip=no
i915.enable_dp_mst=yes
i915.enable_gvt=no
GuC firmware: 
	status: DISABLED
	version: wanted 33.0, found 0.0
	uCode: 0 bytes
	RSA: 0 bytes
HuC firmware: (null)
	status: N/A
	version: wanted 0.0, found 0.0
	uCode: 0 bytes
	RSA: 0 bytes

Edited Feb 11, 2020 by Matt Corallo

Admin message

i915 0000:00:02.0: GPU HANG: ecode 9:1:0x85dffffb, in Xorg [1360], hang on rcs0