On Tue, Nov 14, 2017 at 07:48:47AM +0100, Sebastian Gottschall wrote: > ahm it compiles well. but > > [ 24.838120] Unable to handle kernel NULL pointer dereference at virtual > address 00000055 > [ 24.846193] pgd = c0004000 > [ 24.848893] [00000055] *pgd=00000000 > [ 24.852472] Internal error: Oops - BUG: 817 [#1] PREEMPT SMP ARM > [ 24.858463] Modules linked in: xhci_plat_hcd xhci_pci xhci_hcd ohci_hcd > ehci_pci ehci_platform ehci_hcd usbcore usb_common nls_base qca_ssdk > gpio_pca953x mii_gpio wil6210 ath10k_pci ath10k_core ath9k ath9k_common > ath9k_hw ath mac80211 cfg80211 compat > [ 24.880852] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.9.62-rc1 #90 > [ 24.887189] Hardware name: AnnapurnaLabs Alpine (Device Tree) > [ 24.892921] task: ef029ac0 task.stack: ef05a000 > [ 24.897444] PC is at nf_nat_cleanup_conntrack+0x4c/0x74 > [ 24.902657] LR is at nf_nat_cleanup_conntrack+0x38/0x74 > [ 24.907869] pc : [<c04858c8>] lr : [<c04858b4>] psr: 60000153 > [ 24.907869] sp : ef05bb58 ip : ef05bb58 fp : ef05bb6c > [ 24.919317] r10: ed230cc0 r9 : ed230c00 r8 : edf45800 > [ 24.924529] r7 : ebcd2f00 r6 : ec33739e r5 : c0892294 r4 : ebcd2f00 > [ 24.931040] r3 : 00000000 r2 : 00000055 r1 : 00000000 r0 : c0892718 > [ 24.937551] Flags: nZCv IRQs on FIQs off Mode SVC_32 ISA ARM Segment > user > [ 24.944755] Control: 10c5387d Table: 2bd1006a DAC: 00000055 > [ 24.950486] Process swapper/2 (pid: 0, stack limit = 0xef05a210) > [ 24.956477] Stack: (0xef05bb58 to 0xef05c000) > > > will dig into the code to find the reason Can you run 'git bisect' or if you use quilt, do a manual bisect to find the offending patch? thanks, greg k-h