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[Luis Henriques <luis.henriques@xxxxxxxxxxxxx>]

** Also affects: linux-snapdragon (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux-snapdragon (Ubuntu Xenial)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1644596

Title:
  4.4.0-1037-snapdragon #41: kernel panic on boot

Status in linux-snapdragon package in Ubuntu:
  New
Status in linux-snapdragon source package in Xenial:
  Triaged

Bug description:
  With the latest Xenial/snapdragon kernel from proposed, on boot i get
  this on my Dragonboard410c:

  ...
  [    6.156756] msm_iommu 1f00000.qcom,iommu: invalid resource
  [    6.159345] msm_iommu 1f00000.qcom,iommu: iface: 100000000, core: 800000000
  [    6.161562] msm_iommu 1f00000.qcom,iommu: device gfx_iommu (model: 500) mapped at ffffff8000fa0000, with 2 ctx banks
  [    6.168703] msm_iommu 1f00000.qcom,iommu: iommu sec: pgtable size: 94208
  [    6.180597] ------------[ cut here ]------------
  [    6.185530] kernel BUG at /home/ppisati/ubuntu-xenial/include/linux/dma-attrs.h:56!
  [    6.190224] Internal error: Oops - BUG: 0 [#1] SMP
  [    6.197579] Modules linked in:
  [    6.205434] CPU: 0 PID: 43 Comm: kworker/u8:1 Not tainted 4.4.0-1035-snapdragon #39~44253minus4
  [    6.205567] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
  [    6.214174] Workqueue: deferwq deferred_probe_work_func
  [    6.225843] task: ffffffc033be3200 ti: ffffffc033cec000 task.ti: ffffffc033cec000
  [    6.226239] PC is at msm_iommu_probe+0x628/0x630
  [    6.233533] LR is at msm_iommu_probe+0x628/0x630
  [    6.238227] pc : [<ffffffc000688438>] lr : [<ffffffc000688438>] pstate: 60000005
  [    6.242845] sp : ffffffc033cefb00
  [    6.250183] x29: ffffffc033cefb00 x28: ffffffc0330152e0                                                           [2485/9156]
  [    6.258475] x27: ffffffc001452000 x26: 0000000000000000 
  [    6.263769] x25: 0000000000000001 x24: ffffffc03d9ce5e0 
  [    6.269063] x23: ffffffc001452000 x22: ffffffc033a9ec10 
  [    6.274356] x21: ffffffc033a9ec00 x20: 0000000000000000 
  [    6.279654] x19: ffffffc031323e18 x18: 0000000000000010 
  [    6.284945] x17: 000000006fa87e4f x16: 000000004f6a80ba 
  [    6.290247] x15: ffffffc001452b10 x14: ffffffc081605b7f 
  [    6.295538] x13: ffffffc001605b8d x12: ffffffc001605000 
  [    6.300831] x11: 0000000000000184 x10: 0000000005f5e0ff 
  [    6.306128] x9 : 000000000000004d x8 : 000000000000000d 
  [    6.311421] x7 : ffffffc033cee6f0 x6 : 0000000000000000 
  [    6.316719] x5 : 0000000000000001 x4 : 000000000000000a 
  [    6.322015] x3 : 0000000000000000 x2 : cb88537fdc8ba619 
  [    6.327307] x1 : cb88537fdc8ba619 x0 : 0000000000000000 
  [    6.332602] 
  [    6.332817] Process kworker/u8:1 (pid: 43, stack limit = 0xffffffc033cec020)
  [    6.334453] Stack: (0xffffffc033cefb00 to 0xffffffc033cf0000)
  [    6.341469] fb00: ffffffc033cefb70 ffffffc0007073b4 ffffffc033a9ec10 00000000fffffffe                             [2467/9156]
  [    6.347111] fb20: ffffffc001516080 ffffffc001452000 ffffffc0015d1000 ffffffc001516080
  [    6.354927] fb40: 0000000000000001 0000000000000000 ffffffc033cefb70 ffffffc000707398
  [    6.362740] fb60: 0000000000017000 cb88537fdc8ba619 ffffffc033cefba0 ffffffc000704e2c
  [    6.370554] fb80: ffffffc033a9ec10 ffffffc0016ac000 0000000000000000 ffffffc0016ac000
  [    6.378359] fba0: ffffffc033cefbf0 ffffffc0007051d8 ffffffc001516080 ffffffc033cefcc8
  [    6.386172] fbc0: ffffffc033a9ec10 ffffffc001452000 0000000000000000 ffffffc001518000
  [    6.393979] fbe0: 0000000000000000 0000000000000000 ffffffc033cefc20 ffffffc000702838
  [    6.401797] fc00: 0000000000000000 ffffffc033cefcc8 ffffffc000705140 ffffffc001452000
  [    6.409609] fc20: ffffffc033cefc80 ffffffc000704ac0 ffffffc033a9ec10 ffffffc001452000
  [    6.417423] fc40: ffffffc033a9ec70 ffffffc0015d1bb0 0000000000000001 ffffffc000704aa8
  [    6.425241] fc60: ffffffc033a9ec10 ffffffc0338370d0 ffffffc033b9c968 cb88537fdc8ba619
  [    6.433051] fc80: ffffffc033cefce0 ffffffc00070529c ffffffc033a9ec10 ffffffc033a9ec10
  [    6.440862] fca0: ffffffc001518cb8 ffffffc0015d1bb0 ffffffc0011a1d00 ffffffc033be3200
  [    6.448670] fcc0: ffffffc03d947700 ffffffc033a9ec10 0000000000000001 cb88537fdc8ba619
  [    6.456487] fce0: ffffffc033cefd00 ffffffc000703c88 ffffffc033a9ec10 ffffffc000d153cc
  [    6.464301] fd00: ffffffc033cefd30 ffffffc0007041d0 ffffffc033a9ec10 ffffffc0015188f0
  [    6.472108] fd20: ffffffc001518918 ffffffc000704220 ffffffc033cefd70 ffffffc0000e42a0
  [    6.479923] fd40: ffffffc001518950 ffffffc033cbb000 ffffffc033015000 ffffffc031202f00
  [    6.487730] fd60: 0000000000000000 ffffffc0015b1706 ffffffc033cefdc0 ffffffc0000e46e4
  [    6.495549] fd80: ffffffc033cbb000 ffffffc033cbb030 ffffffc033015018 ffffffc033015000
  [    6.503357] fda0: ffffffc033cec000 ffffffc0015b1706 0000000000000000 ffffffc033cbb030
  [    6.511176] fdc0: ffffffc033cefe20 ffffffc0000eb248 ffffffc033848380 ffffffc001603600
  [    6.518980] fde0: ffffffc001110db8 ffffffc033cbb000 ffffffc0000e45b8 0000000000000000
  [    6.526799] fe00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.534617] fe20: 0000000000000000 ffffffc000085d90 ffffffc0000eb150 ffffffc033848380
  [    6.542425] fe40: 0000000000000000 0000000000000000 0000000000000000 ffffffc0000f8a38
  [    6.550244] fe60: 0000000000000000 ffffffc033848380 ffffffc033cbb000 0000000000000000
  [    6.558053] fe80: 0000000000000000 ffffffc033cefe88 ffffffc033cefe88 0000007f00000000
  [    6.565860] fea0: 0000000000000000 ffffffc033cefea8 ffffffc033cefea8 cb88537fdc8ba619
  [    6.573676] fec0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.581486] fee0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.589306] ff00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.597108] ff20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.604932] ff40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.612735] ff60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.620554] ff80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.628361] ffa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.636179] ffc0: 0000000000000000 0000000000000005 0000000000000000 0000000000000000                             [2429/9156]
  [    6.643987] ffe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    6.651807] Call trace:
  [    6.659570] [<ffffffc000688438>] msm_iommu_probe+0x628/0x630
  [    6.661879] [<ffffffc0007073b4>] platform_drv_probe+0x6c/0xd8
  [    6.667790] [<ffffffc000704e2c>] driver_probe_device+0x224/0x488
  [    6.673398] [<ffffffc0007051d8>] __device_attach_driver+0x98/0xe0
  [    6.679482] [<ffffffc000702838>] bus_for_each_drv+0x80/0xe0
  [    6.685445] [<ffffffc000704ac0>] __device_attach+0xe8/0x180
  [    6.690835] [<ffffffc00070529c>] device_initial_probe+0x24/0x30
  [    6.696393] [<ffffffc000703c88>] bus_probe_device+0xa0/0xa8
  [    6.702292] [<ffffffc0007041d0>] deferred_probe_work_func+0x58/0xe8
  [    6.707996] [<ffffffc0000e42a0>] process_one_work+0x150/0x468
  [    6.714097] [<ffffffc0000e46e4>] worker_thread+0x12c/0x4b8
  [    6.720056] [<ffffffc0000eb248>] kthread+0xf8/0x110
  [    6.725451] [<ffffffc000085d90>] ret_from_fork+0x10/0x40
  [    6.730184] Code: 90005861 91156021 aa1603e0 9401e099 (d4210000) 
  [    6.736457] ---[ end trace 0cd1309c7d3a2064 ]---
  [    6.744207] Unable to handle kernel paging request at virtual address ffffffffffffffd8
  [    6.746418] pgd = ffffffc0016ce000
  [    6.754093] [ffffffffffffffd8] *pgd=0000000000000000, *pud=0000000000000000
  [    6.764235] Internal error: Oops: 96000005 [#2] SMP
  [    6.764540] Modules linked in:
  [    6.772343] CPU: 0 PID: 43 Comm: kworker/u8:1 Tainted: G      D         4.4.0-1035-snapdragon #39~44253minus4
  [    6.772492] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT)
  [    6.782441] task: ffffffc033be3200 ti: ffffffc033cec000 task.ti: ffffffc033cec000
  [    6.789202] PC is at kthread_data+0x24/0x30
  [    6.796506] LR is at wq_worker_sleeping+0x24/0xe0
  [    6.800458] pc : [<ffffffc0000eb8cc>] lr : [<ffffffc0000e547c>] pstate: 600003c5
  [    6.805344] sp : ffffffc033cef740
  [    6.812762] x29: ffffffc033cef740 x28: ffffffc033278000                                                           [2399/9156]
  [    6.821061] x27: 0000000000000000 x26: ffffffc033be3748 
  [    6.826356] x25: ffffffc000d136f8 x24: ffffffc03d947700 
  [    6.831650] x23: 0000000000000000 x22: ffffffc033be3200 
  [    6.836944] x21: ffffffc03d947700 x20: 0000000000000000 
  [    6.842240] x19: ffffffc033be3200 x18: 00000000fffffff6 
  [    6.847533] x17: 0000000000000018 x16: 000000000000000e 
  [    6.852827] x15: 0000000000000007 x14: 0000000000000001 
  [    6.858126] x13: 0000000000000007 x12: 000000000000000e 
  [    6.863420] x11: 0000000000000013 x10: 000000000000001a 
  [    6.868715] x9 : 0000000000000000 x8 : 0000000000000000 
  [    6.874011] x7 : 0000000000000001 x6 : 0000000000000001 
  [    6.879306] x5 : ffffffc000d313d0 x4 : 0000000002e785c8 
  [    6.884599] x3 : ffffffc033be3260 x2 : 0000000000000000 
  [    6.889894] x1 : 0000000000000000 x0 : 0000000000000000 
  [    6.895199] 
  [    6.895387] Process kworker/u8:1 (pid: 43, stack limit = 0xffffffc033cec020)
  [    6.897025] Stack: (0xffffffc033cef740 to 0xffffffc033cf0000)
  [    6.904041] f740: ffffffc033cef760 ffffffc000d134a4 ffffffc001430000 ffffffc001455000
  [    6.909699] f760: ffffffc033cef7c0 ffffffc000d136f8 ffffffc033cec000 ffffffc033cef848
  [    6.917512] f780: ffffffc033cef3d8 ffffffc001452000 0000000000000000 0000000000000000
  [    6.925323] f7a0: 0000000000000001 0000000000000000 ffffffc001452000 ffffffc001452000
  [    6.933137] f7c0: ffffffc033cef7e0 ffffffc0000cbd24 ffffffc033be3200 ffffffc0000cbce4
  [    6.940951] f7e0: ffffffc033cef860 ffffffc00008ad10 ffffffc0015fb000 0000000000000001
  [    6.948766] f800: ffffffc001109a70 ffffffc033cef9d0 ffffffc033cec000 ffffffc033be3200
  [    6.956569] f820: 0000000000000001 0000000000000000 ffffffc001452000 ffffffc033cec000
  [    6.964392] f840: ffffffc033cec000 ffffffc033cef848 ffffffc033cef848 cb88537fdc8ba619
  [    6.972196] f860: ffffffc033cef8a0 ffffffc00008ad70 ffffffc033cef9d0 ffffffc033cef9d0
  [    6.980004] f880: 00000000f2000800 0000000000000000 ffffffc033cef9d0 000000000000003d
  [    6.987816] f8a0: ffffffc033cef8c0 ffffffc00008adf0 ffffffc033cef9d0 ffffffc03d9ce5e0
  [    6.995637] f8c0: ffffffc033cef8e0 ffffffc000083a4c 00000000f2000800 ffffffc0330152e0
  [    7.003443] f8e0: ffffffc033cef900 ffffffc0000824f8 ffffffc0015a3d08 ffffffc001452000
  [    7.011262] f900: ffffffc033cefb00 ffffffc0000855d4 ffffffc031323e18 0000008000000000
  [    7.019071] f920: ffffffc033cefb00 ffffffc000688438 0000000060000005 ff00756d6d6f692c
  [    7.026890] f940: ffffffc033cefb60 0000000002000c03 ffffffc0016b2fe8 ffffffc0015e86a8
  [    7.034691] f960: ffffffc033cef9a0 ffffffc0009ca0c4 0000000000000015 ffffffc0009ca0c4
  [    7.042518] f980: ffffffc033cefac0 cb88537fdc8ba619 ffffffc033cefa40 ffffffc0007001b0
  [    7.050327] f9a0: ffffffc033a9ec10 ffffffc001109b00 ffffffc033cefa98 0000000000000000
  [    7.058137] f9c0: ffffffc033cefa40 cb88537fdc8ba619 0000000000000000 cb88537fdc8ba619                             [2361/9156]
  [    7.065952] f9e0: cb88537fdc8ba619 0000000000000000 000000000000000a 0000000000000001
  [    7.073766] fa00: 0000000000000000 ffffffc033cee6f0 000000000000000d 000000000000004d
  [    7.081576] fa20: 0000000005f5e0ff 0000000000000184 ffffffc001605000 ffffffc001605b8d
  [    7.089386] fa40: ffffffc081605b7f ffffffc001452b10 000000004f6a80ba 000000006fa87e4f
  [    7.097203] fa60: 0000000000000010 ffffffc031323e18 0000000000000000 ffffffc033a9ec00
  [    7.105012] fa80: ffffffc033a9ec10 ffffffc001452000 ffffffc03d9ce5e0 0000000000000001
  [    7.112823] faa0: 0000000000000000 ffffffc001452000 ffffffc0330152e0 ffffffc033cefb00
  [    7.120645] fac0: ffffffc000688438 ffffffc033cefb00 ffffffc000688438 0000000060000005
  [    7.128446] fae0: 0000000000000000 0000000000000000 ffffffffffffffff 0000000000000000
  [    7.136271] fb00: ffffffc033cefb70 ffffffc0007073b4 ffffffc033a9ec10 00000000fffffffe
  [    7.144074] fb20: ffffffc001516080 ffffffc001452000 ffffffc0015d1000 ffffffc001516080
  [    7.151890] fb40: 0000000000000001 0000000000000000 ffffffc033cefb70 ffffffc000707398
  [    7.159700] fb60: 0000000000017000 cb88537fdc8ba619 ffffffc033cefba0 ffffffc000704e2c
  [    7.167513] fb80: ffffffc033a9ec10 ffffffc0016ac000 0000000000000000 ffffffc0016ac000
  [    7.175331] fba0: ffffffc033cefbf0 ffffffc0007051d8 ffffffc001516080 ffffffc033cefcc8
  [    7.183138] fbc0: ffffffc033a9ec10 ffffffc001452000 0000000000000000 ffffffc001518000
  [    7.190950] fbe0: 0000000000000000 0000000000000000 ffffffc033cefc20 ffffffc000702838
  [    7.198761] fc00: 0000000000000000 ffffffc033cefcc8 ffffffc000705140 ffffffc001452000
  [    7.206578] fc20: ffffffc033cefc80 ffffffc000704ac0 ffffffc033a9ec10 ffffffc001452000
  [    7.214386] fc40: ffffffc033a9ec70 ffffffc0015d1bb0 0000000000000001 ffffffc000704aa8
  [    7.222197] fc60: ffffffc033a9ec10 ffffffc0338370d0 ffffffc033b9c968 cb88537fdc8ba619
  [    7.230013] fc80: ffffffc033cefce0 ffffffc00070529c ffffffc033a9ec10 ffffffc033a9ec10
  [    7.237825] fca0: ffffffc001518cb8 ffffffc0015d1bb0 ffffffc0011a1d00 ffffffc033be3200
  [    7.245642] fcc0: ffffffc03d947700 ffffffc033a9ec10 0000000000000001 cb88537fdc8ba619
  [    7.253447] fce0: ffffffc033cefd00 ffffffc000703c88 ffffffc033a9ec10 ffffffc000d153cc
  [    7.261272] fd00: ffffffc033cefd30 ffffffc0007041d0 ffffffc033a9ec10 ffffffc0015188f0
  [    7.269075] fd20: ffffffc001518918 ffffffc000704220 ffffffc033cefd70 ffffffc0000e42a0
  [    7.276897] fd40: ffffffc001518950 ffffffc033cbb000 ffffffc033015000 ffffffc031202f00
  [    7.284699] fd60: 0000000000000000 ffffffc0015b1706 ffffffc033cefdc0 ffffffc0000e46e4
  [    7.292519] fd80: ffffffc033cbb000 ffffffc033cbb030 ffffffc033015018 ffffffc033015000
  [    7.300329] fda0: ffffffc033cec000 ffffffc0015b1706 0000000000000000 ffffffc033cbb030
  [    7.308134] fdc0: ffffffc033cefe20 ffffffc0000eb248 ffffffc033848380 ffffffc001603600
  [    7.315953] fde0: ffffffc001110db8 ffffffc033cbb000 ffffffc0000e45b8 0000000000000000
  [    7.323763] fe00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.331572] fe20: 0000000000000000 ffffffc000085d90 ffffffc0000eb150 ffffffc033848380
  [    7.339397] fe40: 0000000000000000 0000000000000000 0000000000000000 ffffffc0000f8a38
  [    7.347197] fe60: 0000000000000000 ffffffc033848380 ffffffc033cbb000 0000000000000000
  [    7.355014] fe80: 0000000000000000 ffffffc033cefe88 ffffffc033cefe88 0000007f00000001
  [    7.362820] fea0: 0000000000010001 ffffffc033cefea8 ffffffc033cefea8 cb88537fdc8ba619
  [    7.370642] fec0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.378449] fee0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.386261] ff00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.394071] ff20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.401886] ff40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.409702] ff60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.417506] ff80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.425322] ffa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.433142] ffc0: 0000000000000000 0000000000000005 0000000000000000 0000000000000000
  [    7.440952] ffe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  [    7.448757] Call trace:
  [    7.456512] [<ffffffc0000eb8cc>] kthread_data+0x24/0x30
  [    7.458883] [<ffffffc000d134a4>] __schedule+0x53c/0x750
  [    7.464011] [<ffffffc000d136f8>] schedule+0x40/0xa0
  [    7.469331] [<ffffffc0000cbd24>] do_exit+0x684/0x9d0
  [    7.474136] [<ffffffc00008ad10>] die+0x1b8/0x1d0
  [    7.479285] [<ffffffc00008ad70>] bug_handler.part.1+0x48/0x88
  [    7.483889] [<ffffffc00008adf0>] bug_handler+0x40/0x50
  [    7.489540] [<ffffffc000083a4c>] brk_handler+0x84/0xd0
  [    7.494573] [<ffffffc0000824f8>] do_debug_exception+0x68/0xe8
  [    7.499706] Exception stack(0xffffffc033cef910 to 0xffffffc033cefa40)
  [    7.505508] f900:                                   ffffffc031323e18 0000008000000000
  [    7.511960] f920: ffffffc033cefb00 ffffffc000688438 0000000060000005 ff00756d6d6f692c
  [    7.519762] f940: ffffffc033cefb60 0000000002000c03 ffffffc0016b2fe8 ffffffc0015e86a8
  [    7.527579] f960: ffffffc033cef9a0 ffffffc0009ca0c4 0000000000000015 ffffffc0009ca0c4
  [    7.535397] f980: ffffffc033cefac0 cb88537fdc8ba619 ffffffc033cefa40 ffffffc0007001b0
  [    7.543204] f9a0: ffffffc033a9ec10 ffffffc001109b00 ffffffc033cefa98 0000000000000000
  [    7.551025] f9c0: ffffffc033cefa40 cb88537fdc8ba619 0000000000000000 cb88537fdc8ba619
  [    7.558829] f9e0: cb88537fdc8ba619 0000000000000000 000000000000000a 0000000000000001
  [    7.566646] fa00: 0000000000000000 ffffffc033cee6f0 000000000000000d 000000000000004d
  [    7.574453] fa20: 0000000005f5e0ff 0000000000000184 ffffffc001605000 ffffffc001605b8d
  [    7.582275] [<ffffffc0000855d4>] el1_dbg+0x18/0x74
  [    7.590054] [<ffffffc0007073b4>] platform_drv_probe+0x6c/0xd8
  [    7.594773] [<ffffffc000704e2c>] driver_probe_device+0x224/0x488
  [    7.600573] [<ffffffc0007051d8>] __device_attach_driver+0x98/0xe0
  [    7.606651] [<ffffffc000702838>] bus_for_each_drv+0x80/0xe0
  [    7.612623] [<ffffffc000704ac0>] __device_attach+0xe8/0x180
  [    7.618002] [<ffffffc00070529c>] device_initial_probe+0x24/0x30
  [    7.623561] [<ffffffc000703c88>] bus_probe_device+0xa0/0xa8
  [    7.629460] [<ffffffc0007041d0>] deferred_probe_work_func+0x58/0xe8
  [    7.635063] [<ffffffc0000e42a0>] process_one_work+0x150/0x468
  [    7.641271] [<ffffffc0000e46e4>] worker_thread+0x12c/0x4b8
  [    7.647169] [<ffffffc0000eb248>] kthread+0xf8/0x110
  [    7.652555] [<ffffffc000085d90>] ret_from_fork+0x10/0x40
  [    7.657340] Code: d503201f f9427660 f9400bf3 a8c27bfd (f85d8000) 
  [   66.751525] INFO: rcu_sched detected stalls on CPUs/tasks:
  [   66.755958]  0-...: (1 GPs behind) idle=7f7/140000000000001/0 softirq=219/220 fqs=14999 
  [   66.756103]  (detected by 1, t=15005 jiffies, g=-216, c=-217, q=19)
  [   66.765370] Task dump for CPU 0:
  [   66.770202] kworker/u8:1    x ffffffc000086c50     0    43      0 0x00000000
  [   66.777983] Call trace:
  [   66.780540] [<ffffffc000086c50>] __switch_to+0x90/0xa8
  [   66.782920] [<ffffffc033cef740>] 0xffffffc033cef740

  
  after some debugging i found that reverting these three patches fixed it:

  7c50722 nvme: use the DMA_ATTR_NO_WARN attribute
  96530c8 powerpc: implement the DMA_ATTR_NO_WARN attribute
  3fbd4bc dma-mapping: introduce the DMA_ATTR_NO_WARN attribute

  it appears the real problem is only 3fbd4bc, where it overrides all
  the DMA #defines (and introduce a new one), but without this commit,
  the other two patches are moot and break compilation.

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