Hi,
I'm running into a kernel crash while using the functionfs driver on
4.9 and 4.12 kernels. This is reproducible by using any of the aio
syscalls with functionfs on the above kernels. The code in question is
in ffs_user_copy_worker, which is a work thread that copies a bit of
data into userspace. Interestingly, a set_fs(USER_DS) before
copy_to_iter in the work thread will prevent the crash. I'm told
though that this shouldn't be necessary if the thread does not set_fs
to KERNEL_DS, which it does not (nor does the rest of the driver, at
all). There is also no problem on 4.4.
Perhaps this is related to some of the mm changes in arch/arm64 that
went in between 4.4 and 4.9? Alternatively, it could actually be
necessary to set_fs(USER_DS) in a work thread before accessing user
memory? Let us know.
Thanks,
Jerry
Here is the full crash log:
[ 215.871963] Internal error: Accessing user space memory with
fs=KERNEL_DS: 9600004f [#1] PREEMPT SMP
[ 215.881330] CPU: 1 PID: 1343 Comm: kworker/1:1 Tainted: G S
4.9.41-gf48b3b5b324d #1
[ 215.890314] Hardware name: HiKey960 (DT)
[ 215.894319] Workqueue: events ffs_user_copy_worker
[ 215.899178] task: ffffffc0b5ce5080 task.stack: ffffffc0b52bc000
[ 215.905184] PC is at __arch_copy_to_user+0xa4/0x280
[ 215.910128] LR is at copy_to_iter+0x7c/0x3e0
[ 215.914454] pc : [<ffffff8008510fa4>] lr : [<ffffff8008525c10>]
pstate: 80000105
[ 215.921940] sp : ffffffc0b52bfca0
[ 215.925295] x29: ffffffc0b52bfca0 x28: ffffffc0b5322400
[ 215.930682] x27: ffffffc0b324fb98 x26: 0000000000000018
[ 215.936069] x25: ffffffc0a8417a10 x24: 0000000000000018
[ 215.941456] x23: 0000000000000000 x22: 0000000000000000
[ 215.946845] x21: ffffffc0b0e5a380 x20: 0000000000000018
[ 215.952249] x19: ffffffc0a8417a50 x18: 0000000000000000
[ 215.957686] x17: 0000000000000000 x16: 0000000000000000
[ 215.963121] x15: 0000000000000000 x14: 0000000000000000
[ 215.968557] x13: 0000000000000000 x12: 0000000000000000
[ 215.973991] x11: 0000000000000001 x10: 0000000000000a60
[ 215.979432] x9 : ffffffc0b52bc000 x8 : 0000001000000001
[ 215.984870] x7 : 000006c445545257 x6 : 0000007fb78418d8
[ 215.990299] x5 : 0000007fb78418f0 x4 : 0000000000000000
[ 215.995728] x3 : 0000000000000010 x2 : 0000000000000018
[ 216.001162] x1 : ffffffc0b324fb90 x0 : 0000007fb78418d8
[ 216.006606]
[ 216.006606] SP: 0xffffffc0b52bfc20:
[ 216.011683] fc20 [ 216.013469] 00000000
00000000[ 216.016598] 00000000
00000000[ 216.019722] 00000018
00000000[ 216.022846] a8417a10
ffffffc0[ 216.025971]
[ 216.027493] fc40 [ 216.029282] 00000018
00000000[ 216.032403] b324fb98
ffffffc0[ 216.035526] b5322400
ffffffc0[ 216.038652] b52bfca0
ffffffc0[ 216.041778]
[ 216.043296] fc60 [ 216.045082] 08525c10
ffffff80[ 216.048209] b52bfca0
ffffffc0[ 216.051334] 08510fa4
ffffff80[ 216.054459] 80000105
00000000[ 216.057584]
[ 216.059105] fc80 [ 216.060889] 082000dc
ffffff80[ 216.064016] b5ce5888
ffffffc0[ 216.067142] ffffffff
ffffffff[ 216.070264] 00000018
00000000[ 216.073384]
[ 216.074903] fca0 [ 216.076683] b52bfd20
ffffffc0[ 216.079808] 08864224
ffffff80[ 216.082934] a8417a50
ffffffc0[ 216.086062] a8417a00
ffffffc0[ 216.089185]
[ 216.090703] fcc0 [ 216.092487] 00000018
00000000[ 216.095612] 00000000
00000000[ 216.098736] 00000000
00000000[ 216.101859] 00000018
00000000[ 216.104981]
[ 216.106500] fce0 [ 216.108288] 00000000
00000000[ 216.111413] 00000000
00000000[ 216.114537] 00000000
00000000[ 216.117662] b5322400
ffffffc0[ 216.120786]
[ 216.122303] fd00 [ 216.124089] a8417a50
ffffffc0[ 216.127214] a8417a00
ffffffc0[ 216.130339] 00000018
00000000[ 216.133464] 00000000
00000000[ 216.136590]
[ 216.138114]
[ 216.138114] X1: 0xffffffc0b324fb10:
[ 216.143184] fb10 [ 216.144969] b324fb08
ffffffc0[ 216.148093] b324fb18
ffffffc0[ 216.151215] b324fb18
ffffffc0[ 216.154340] b324fb28
ffffffc0[ 216.157464]
[ 216.158985] fb30 [ 216.160764] b324fb28
ffffffc0[ 216.163890] 00000000
00000000[ 216.167016] 00000000
00000000[ 216.170143] 000000fb
00000000[ 216.173263]
[ 216.174785] fb50 [ 216.176565] ac2ab000
ffffffc0[ 216.179688] 00000000
00000000[ 216.182818] ffffaff9
00000000[ 216.185940] 00000000
00000000[ 216.189065]
[ 216.190584] fb70 [ 216.192365] 00000000
00000000[ 216.195487] 00000000
00000000[ 216.198614] 45545257
000006c4[ 216.201737] 00000001
00000010[ 216.204858]
[ 216.206378] fb90 [ 216.208159] 0000028e
baabada8[ 216.211284] a8417a00
ffffffc0[ 216.214412] 00000000
00000000[ 216.217540] ae5ceb00
ffffffc0[ 216.220664]
[ 216.222184] fbb0 [ 216.223968] 08864580
ffffff80[ 216.227094] b7a3b000
0000007f[ 216.230219] 00000000
00000000[ 216.233340] 00000100
dead0000[ 216.236467]
[ 216.237986] fbd0 [ 216.239772] 00000200
dead0000[ 216.242895] 00000000
00000000[ 216.246016] 00000000
00000000[ 216.249143] 00000000
00000000[ 216.252264]
[ 216.253786] fbf0 [ 216.255572] 00000000
00000000[ 216.258697] 00000000
00000000[ 216.261822] 00070007
ffffffc0[ 216.264945] b324fc08
ffffffc0[ 216.268071]
[ 216.269596]
[ 216.269596] X9: 0xffffffc0b52bbf80:
[ 216.274675] bf80 [ 216.276458] 00000000
00000000[ 216.279583] 00000000
00000000[ 216.282701] 00000000
00000000[ 216.285823] 00000000
00000000[ 216.288947]
[ 216.290466] bfa0 [ 216.292250] 00000000
00000000[ 216.295372] 00000000
00000000[ 216.298501] 00000000
00000000[ 216.301627] 00000000
00000000[ 216.304749]
[ 216.306267] bfc0 [ 216.308048] 00000000
00000000[ 216.311172] 00000005
00000000[ 216.314296] 00000000
00000000[ 216.317417] 00000000
00000000[ 216.320543]
[ 216.322063] bfe0 [ 216.323846] 00000000
00000000[ 216.326974] 00000000
00000000[ 216.330097] 00000000
00000000[ 216.333223] 00000000
00000000[ 216.336346]
[ 216.337868] c000 [ 216.339652] 00000002
00000000[ 216.342778] ffffffff
ffffffff[ 216.345905] b5ce5080
ffffffc0[ 216.349028] 00000001
00000001[ 216.352156]
[ 216.353679] c020 [ 216.355466] 57ac6e9d
00000000[ 216.358590] b52bc028
ffffffc0[ 216.361714] b52bc028
ffffffc0[ 216.364836] 080f11ac
ffffff80[ 216.367961]
[ 216.369479] c040 [ 216.371266] 00000006
00000000[ 216.374388] 0872c710
ffffff80[ 216.377515] b537e000
ffffffc0[ 216.380637] 09290fe0
ffffff80[ 216.383758]
[ 216.385278] c060 [ 216.387059] 00000000
00000000[ 216.390182] 00000000
00000000[ 216.393306] 00000000
00000000[ 216.396427] 00000000
00000000[ 216.399551]
[ 216.401082]
[ 216.401082] X19: 0xffffffc0a84179d0:
[ 216.406242] 79d0 [ 216.408024] 00000000
00000000[ 216.411151] a84179d8
ffffffc0[ 216.414272] a84179d8
ffffffc0[ 216.417397] a84179e8
ffffffc0[ 216.420518]
[ 216.422038] 79f0 [ 216.423820] a84179e8
ffffffc0[ 216.426946] a84189b0
ffffffc0[ 216.430066] 00000101
00000000[ 216.433189] b0ed4b00
ffffffc0[ 216.436311]
[ 216.437831] 7a10 [ 216.439615] 00000000
ffffff80[ 216.442738] 00000000
00000000[ 216.445863] 00000018
00000000[ 216.448984] b0e5a380
ffffffc0[ 216.452111]
[ 216.453631] 7a30 [ 216.455415] 00000001
00000000[ 216.458539] b0e5a380
ffffffc0[ 216.461659] b324fb80
ffffffc0[ 216.464778] b3f8f140
ffffffc0[ 216.467906]
[ 216.469423] 7a50 [ 216.471205] 00000040
00000000[ 216.474328] a8417a58
ffffffc0[ 216.477452] a8417a58
ffffffc0[ 216.480575] 088641b8
ffffff80[ 216.483695]
[ 216.485216] 7a70 [ 216.486996] b5027800
ffffffc0[ 216.490124] a8417300
ffffffc0[ 216.493247] b3022400
ffffffc0[ 216.496368] 00001000
00000000[ 216.499489]
[ 216.501009] 7a90 [ 216.502794] 029d32c0
ffffffbf[ 216.505920] 00001000
00000000[ 216.509041] 029d3300
ffffffbf[ 216.512167] 00001000
00000000[ 216.515291]
[ 216.516811] 7ab0 [ 216.518597] 029d3340
ffffffbf[ 216.521726] 00001000
00000000[ 216.524851] 029d3380
ffffffbf[ 216.527975] 00001000
00000000[ 216.531098]
[ 216.532621]
[ 216.532621] X21: 0xffffffc0b0e5a300:
[ 216.537783] a300 [ 216.539568] 093d47a0
ffffff80[ 216.542692] b395ca00
ffffffc0[ 216.545812] b0eaf890
ffffffc0[ 216.548936] b3fa8890
ffffffc0[ 216.552061]
[ 216.553580] a320 [ 216.555365] b0e5a2a0
ffffffc0[ 216.558493] b395ca38
ffffffc0[ 216.561615] 00000000
00000000[ 216.564740] 00000000
00000000[ 216.567862]
[ 216.569378] a340 [ 216.571161] 00000000
00000000[ 216.574282] 00000000
00000000[ 216.577405] 00000000
00000000[ 216.580528] 00000000
00000000[ 216.583653]
[ 216.585174] a360 [ 216.586957] 00000000
00000000[ 216.590078] 00000000
00000000[ 216.593204] 00000000
00000000[ 216.596329] 00000000
00000000[ 216.599453]
[ 216.600971] a380 [ 216.602755] b78418d8
0000007f[ 216.605878] 00000018
00000000[ 216.609003] 00000200
00000000[ 216.612124] b0e5a398
ffffffc0[ 216.615247]
[ 216.616764] a3a0 [ 216.618548] b0e5a398
ffffffc0[ 216.621666] 08248308
ffffff80[ 216.624789] 00000000
00000000[ 216.627912] 00000000
00000000[ 216.631033]
[ 216.632555] a3c0 [ 216.634339] 00000000
00000000[ 216.637463] 00000000
00000000[ 216.640587] 00000000
00000000[ 216.643716] 00000000
00000000[ 216.646838]
[ 216.648358] a3e0 [ 216.650141] 00000000
00000000[ 216.653266] 00000000
00000000[ 216.656390] 00000000
00000000[ 216.659513] 00000000
00000000[ 216.662637]
[ 216.664164]
[ 216.664164] X25: 0xffffffc0a8417990:
[ 216.669324] 7990 [ 216.671108] 00000000
00000000[ 216.674236] b3b0f840
ffffffc0[ 216.677357] 00000000
00000000[ 216.680481] 00000000
00000000[ 216.683603]
[ 216.685120] 79b0 [ 216.686902] 00000000
00000000[ 216.690028] 00000000
00000000[ 216.693154] 00000000
00000000[ 216.696279] ac3e2900
ffffffc0[ 216.699400]
[ 216.700917] 79d0 [ 216.702703] 00000000
00000000[ 216.705823] a84179d8
ffffffc0[ 216.708948] a84179d8
ffffffc0[ 216.712070] a84179e8
ffffffc0[ 216.715193]
[ 216.716712] 79f0 [ 216.718493] a84179e8
ffffffc0[ 216.721622] a84189b0
ffffffc0[ 216.724747] 00000101
00000000[ 216.727872] b0ed4b00
ffffffc0[ 216.730995]
[ 216.732514] 7a10 [ 216.734296] 00000000
ffffff80[ 216.737421] 00000000
00000000[ 216.740544] 00000018
00000000[ 216.743669] b0e5a380
ffffffc0[ 216.746790]
[ 216.748311] 7a30 [ 216.750095] 00000001
00000000[ 216.753216] b0e5a380
ffffffc0[ 216.756340] b324fb80
ffffffc0[ 216.759464] b3f8f140
ffffffc0[ 216.762591]
[ 216.764111] 7a50 [ 216.765893] 00000040
00000000[ 216.769017] a8417a58
ffffffc0[ 216.772142] a8417a58
ffffffc0[ 216.775271] 088641b8
ffffff80[ 216.778393]
[ 216.779913] 7a70 [ 216.781700] b5027800
ffffffc0[ 216.784821] a8417300
ffffffc0[ 216.787941] b3022400
ffffffc0[ 216.791067] 00001000
00000000[ 216.794188]
[ 216.795710]
[ 216.795710] X27: 0xffffffc0b324fb18:
[ 216.800870] fb18 [ 216.802654] b324fb18
ffffffc0[ 216.805778] b324fb18
ffffffc0[ 216.808906] b324fb28
ffffffc0[ 216.812032] b324fb28
ffffffc0[ 216.815154]
[ 216.816676] fb38 [ 216.818460] 00000000
00000000[ 216.821584] 00000000
00000000[ 216.824707] 000000fb
00000000[ 216.827832] ac2ab000
ffffffc0[ 216.830957]
[ 216.832476] fb58 [ 216.834258] 00000000
00000000[ 216.837379] ffffaff9
00000000[ 216.840504] 00000000
00000000[ 216.843627] 00000000
00000000[ 216.846750]
[ 216.848270] fb78 [ 216.850056] 00000000
00000000[ 216.853180] 45545257
000006c4[ 216.856301] 00000001
00000010[ 216.859425] 0000028e
baabada8[ 216.862552]
[ 216.864074] fb98 [ 216.865855] a8417a00
ffffffc0[ 216.868976] 00000000
00000000[ 216.872099] ae5ceb00
ffffffc0[ 216.875218] 08864580
ffffff80[ 216.878341]
[ 216.879861] fbb8 [ 216.881646] b7a3b000
0000007f[ 216.884774] 00000000
00000000[ 216.887895] 00000100
dead0000[ 216.891019] 00000200
dead0000[ 216.894143]
[ 216.895660] fbd8 [ 216.897447] 00000000
00000000[ 216.900571] 00000000
00000000[ 216.903699] 00000000
00000000[ 216.906822] 00000000
00000000[ 216.909945]
[ 216.911465] fbf8 [ 216.913246] 00000000
00000000[ 216.916371] 00070007
ffffffc0[ 216.919496] b324fc08
ffffffc0[ 216.922615] b324fc08
ffffffc0[ 216.925740]
[ 216.927263]
[ 216.927263] X28: 0xffffffc0b5322380:
[ 216.932430] 2380 [ 216.934214] 00000000
5f776809[ 216.937333] 61726170
0000736d[ 216.940457] 00000000
00000000[ 216.943581] 00000000
00000000[ 216.946700]
[ 216.948221] 23a0 [ 216.950002] 00000000
00000000[ 216.953126] 00000000
00000000[ 216.956252] 00000000
00000000[ 216.959377] 00000000
00000000[ 216.962500]
[ 216.964018] 23c0 [ 216.965804] 00000000
00000000[ 216.968930] 00000000
00000000[ 216.972054] 00000000
00000000[ 216.975175] 00000000
00000000[ 216.978296]
[ 216.979817] 23e0 [ 216.981602] 00000000
00000000[ 216.984726] 00000000
00000000[ 216.987855] 00000000
00000000[ 216.990979] 00000000
00000000[ 216.994104]
[ 216.995622] 2400 [ 216.997406] 00000000
00000000[ 217.000528] be1283f0
ffffffc0[ 217.003652] a8417a50
ffffffc0[ 217.006778] 088641b8
ffffff80[ 217.009900]
[ 217.011419] 2420 [ 217.013202] bff5da00
ffffffbe[ 217.016329] 00000000
00000000[ 217.019452] b5322430
ffffffc0[ 217.022575] b5322430
ffffffc0[ 217.025694]
[ 217.027216] 2440 [ 217.028996] b5ce5080
ffffffc0[ 217.032122] be128280
ffffffc0[ 217.035250] be1285b0
ffffffc0[ 217.038372] 89dae250
ffffffc0[ 217.041499]
[ 217.043021] 2460 [ 217.044801] ffffadcb
00000000[ 217.047926] 00000000
00000001[ 217.051054] 00000000
00000000[ 217.054178] 00000000
00000000[ 217.057299]
[ 217.058822]
[ 217.058822] X29: 0xffffffc0b52bfc20:
[ 217.063984] fc20 [ 217.065769] 00000000
00000000[ 217.068895] 00000000
00000000[ 217.072019] 00000018
00000000[ 217.075144] a8417a10
ffffffc0[ 217.078266]
[ 217.079787] fc40 [ 217.081567] 00000018
00000000[ 217.084691] b324fb98
ffffffc0[ 217.087816] b5322400
ffffffc0[ 217.090940] b52bfca0
ffffffc0[ 217.094062]
[ 217.095582] fc60 [ 217.097366] 08525c10
ffffff80[ 217.100495] b52bfca0
ffffffc0[ 217.103620] 08510fa4
ffffff80[ 217.106748] 80000105
00000000[ 217.109875]
[ 217.111394] fc80 [ 217.113177] 082000dc
ffffff80[ 217.116302] b5ce5888
ffffffc0[ 217.119427] ffffffff
ffffffff[ 217.122549] 00000018
00000000[ 217.125672]
[ 217.127194] fca0 [ 217.128975] b52bfd20
ffffffc0[ 217.132099] 08864224
ffffff80[ 217.135218] a8417a50
ffffffc0[ 217.138343] a8417a00
ffffffc0[ 217.141469]
[ 217.142989] fcc0 [ 217.144770] 00000018
00000000[ 217.147893] 00000000
00000000[ 217.151022] 00000000
00000000[ 217.154150] 00000018
00000000[ 217.157271]
[ 217.158792] fce0 [ 217.160579] 00000000
00000000[ 217.163702] 00000000
00000000[ 217.166827] 00000000
00000000[ 217.169947] b5322400
ffffffc0[ 217.173070]
[ 217.174590] fd00 [ 217.176371] a8417a50
ffffffc0[ 217.179491] a8417a00
ffffffc0[ 217.182613] 00000018
00000000[ 217.185738] 00000000
00000000[ 217.188862]
[ 217.190380]
[ 217.191907] Process kworker/1:1 (pid: 1343, stack limit = 0xffffffc0b52bc020)
[ 217.199200] Stack: (0xffffffc0b52bfca0 to 0xffffffc0b52c0000)
[ 217.205079] fca0: ffffffc0b52bfd20 ffffff8008864224
ffffffc0a8417a50 ffffffc0a8417a00
[ 217.213077] fcc0: 0000000000000018 0000000000000000
0000000000000000 0000000000000018
[ 217.221080] fce0: 0000000000000000 0000000000000000
0000000000000000 ffffffc0b5322400
[ 217.229091] fd00: ffffffc0a8417a50 ffffffc0a8417a00
0000000000000018 0000000000000000
[ 217.237094] fd20: ffffffc0b52bfd60 ffffff80080e5d88
ffffffc0b5322400 ffffffc0a8417a50
[ 217.245094] fd40: ffffffc0be128280 ffffffbebff5da00
0000000000000000 ffffffc0a8417a58
[ 217.253100] fd60: ffffffc0b52bfdb0 ffffff80080e60d4
ffffffc0be128280 ffffffc0b5322430
[ 217.261104] fd80: ffffffc0be1282a0 ffffff80091e6000
ffffffc0b52bc000 ffffff80092292e3
[ 217.269111] fda0: 0000000000000000 ffffffc0b5322430
ffffffc0b52bfe20 ffffff80080ece68
[ 217.277119] fdc0: ffffffc0b503e080 ffffffc0b52bc000
ffffff8008f7ce00 ffffffc0b5322400
[ 217.285127] fde0: ffffff80080e6078 0000000000000000
0000000000000000 0000000000000000
[ 217.293132] fe00: 0000000000000000 0000000000000000
ffffff8008f7ce00 ffffffc0b5322400
[ 217.301131] fe20: 0000000000000000 ffffff8008083680
ffffff80080ecd7c ffffffc0b503e080
[ 217.309134] fe40: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.317137] fe60: 0000000000000000 0000000000000000
ffffffc0b52bfea0 ffffffc0b5322400
[ 217.325137] fe80: ffffffc000000000 ffffffc000000000
ffffffc0b52bfe90 ffffffc0b52bfe90
[ 217.333138] fea0: 0000000000000000 ffffff8000000000
ffffffc0b52bfeb0 ffffffc0b52bfeb0
[ 217.341145] fec0: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.349146] fee0: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.357153] ff00: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.365154] ff20: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.373164] ff40: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.381166] ff60: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.389172] ff80: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.397172] ffa0: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.405177] ffc0: 0000000000000000 0000000000000005
0000000000000000 0000000000000000
[ 217.413179] ffe0: 0000000000000000 0000000000000000
ffffffc0b52c01d0 ffffff8008082dd0
[ 217.421183] Call trace:
[ 217.423688] Exception stack(0xffffffc0b52bfad0 to 0xffffffc0b52bfc00)
[ 217.430270] fac0:
ffffffc0a8417a50 0000008000000000
[ 217.438272] fae0: ffffffc0b52bfca0 ffffff8008510fa4
0000000000000180 ffffffc0ac07488c
[ 217.446272] fb00: ffffffc0b52bfb30 ffffff8008cea524
0000000000000180 ffffffc0ac07488c
[ 217.454275] fb20: 0000000000000000 ffffffc0be128b80
ffffffc0b52bfb70 ffffff80085326c8
[ 217.462280] fb40: ffffffc0b52bfc10 ffffffc0b52bfc60
ffffffc0b5ce5080 ffffffc0b5ce5080
[ 217.470284] fb60: ffffffc0ae5cea08 ffffffc0ae5ce9b0
0000007fb78418d8 ffffffc0b324fb90
[ 217.478284] fb80: 0000000000000018 0000000000000010
0000000000000000 0000007fb78418f0
[ 217.486288] fba0: 0000007fb78418d8 000006c445545257
0000001000000001 ffffffc0b52bc000
[ 217.494296] fbc0: 0000000000000a60 0000000000000001
0000000000000000 0000000000000000
[ 217.502301] fbe0: 0000000000000000 0000000000000000
0000000000000000 0000000000000000
[ 217.510309] [<ffffff8008510fa4>] __arch_copy_to_user+0xa4/0x280
[ 217.516370] [<ffffff8008864224>] ffs_user_copy_worker+0x6c/0x120
[ 217.522513] [<ffffff80080e5d88>] process_one_work+0x14c/0x43c
[ 217.528394] [<ffffff80080e60d4>] worker_thread+0x5c/0x438
[ 217.533920] [<ffffff80080ece68>] kthread+0xec/0x100
[ 217.538914] [<ffffff8008083680>] ret_from_fork+0x10/0x50
[ 217.544350] Code: a88120c7 d503201f d503201f a8c12027 (a88120c7)
[ 217.551388] ---[ end trace b70eea764d93f697 ]---
[ 217.556183] Kernel panic - not syncing: Fatal exception
[ 217.561497] SMP: stopping secondary CPUs
[ 217.565891] Kernel Offset: disabled
[ 217.569436] Memory Limit: none
[ 217.572548] Rebooting in 5 seconds..
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