On 06/09/16 08:51, Itaru Kitayama wrote:
Hi, Observed with kvm-arm-for-v4.8-rc3 when enabling memory debugging options on top of defconfig. defconfig'ed kernel does not have such issue though. Below is the console log: [ 757.644120] Unable to handle kernel paging request at virtual address ffff800661e00000 [ 757.652046] pgd = ffff20000b1a2000 [ 757.655471] [ffff800661e00000] *pgd=00000047fffe3003, *pud=00000047fcd8c003, *pmd=00000047fcc7c003, *pte=00e8004661e00712 [ 757.666492] Internal error: Oops: 96000147 [#3] PREEMPT SMP [ 757.672041] Modules linked in: [ 757.675100] CPU: 7 PID: 3630 Comm: qemu-system-aar Tainted: G D 4.8.0-rc1 #3 [ 757.683240] Hardware name: AppliedMicro X-Gene Mustang Board/X-Gene Mustang Board, BIOS 3.06.15 Aug 19 2016 [ 757.692938] task: ffff80069cdd3580 task.stack: ffff8006adb7c000 [ 757.698840] PC is at __flush_dcache_area+0x1c/0x40 [ 757.703613] LR is at kvm_flush_dcache_pmd+0x60/0x70 [ 757.708469] pc : [<ffff20000809dbdc>] lr : [<ffff2000080b4a70>] pstate: 20000145 [ 757.715830] sp : ffff8006adb7f8b0 [ 757.719130] x29: ffff8006adb7f8b0 x28: ffff200008cd6520 [ 757.724445] x27: ffff80069cce4568 x26: ffff80069cce4480 [ 757.729756] x25: 0000000000000000 x24: 0000000000000000 [ 757.735065] x23: ffff8006ac0f0000 x22: 000000000069fce8 [ 757.740376] x21: ffff80069fce8000 x20: ffff200009635000 [ 757.745690] x19: 0000000004661e00 x18: 0000000000000000 [ 757.751005] x17: 0000000000000000 x16: 000000007f02ac80 [ 757.756316] x15: 0000000000000000 x14: 0000000000000000 [ 757.761625] x13: 0000000000000000 x12: ffffffffffffffff [ 757.766936] x11: 0000000000000040 x10: 1ffff000d5b6fefe [ 757.772247] x9 : ffff8006adb7f650 x8 : dfff200000000000 [ 757.777558] x7 : ffff2000081665f8 x6 : 0000000000000000 [ 757.782870] x5 : 0000000000000003 x4 : 0000000000000000 [ 757.788181] x3 : 000000000000003f x2 : 0000000000000040 [ 757.793491] x1 : ffff800662000000 x0 : ffff800661e00000 [ 757.798800] [ 757.800286] Process qemu-system-aar (pid: 3630, stack limit = 0xffff8006adb7c020) [ 757.807735] Stack: (0xffff8006adb7f8b0 to 0xffff8006adb80000)
...
[ 758.357249] [<ffff20000809dbdc>] __flush_dcache_area+0x1c/0x40 [ 758.363059] [<ffff2000080b6748>] unmap_stage2_range+0x458/0x5f0 [ 758.368954] [<ffff2000080b708c>] kvm_free_stage2_pgd+0x34/0x60 [ 758.374761] [<ffff2000080b2280>] kvm_arch_destroy_vm+0x20/0x68 [ 758.380570] [<ffff2000080aa330>] kvm_put_kvm+0x210/0x358 [ 758.385860] [<ffff2000080aa524>] kvm_vm_release+0x2c/0x40 [ 758.391239] [<ffff2000082ad234>] __fput+0x114/0x2e8 [ 758.396096] [<ffff2000082ad46c>] ____fput+0xc/0x18 [ 758.400869] [<ffff200008104658>] task_work_run+0x108/0x138 [ 758.406332] [<ffff2000080dc8ec>] do_exit+0x48c/0x10e8 [ 758.411363] [<ffff2000080dd5fc>] do_group_exit+0x6c/0x130 [ 758.416739] [<ffff2000080ed924>] get_signal+0x284/0xa18 [ 758.421943] [<ffff20000808a098>] do_signal+0x158/0x860 [ 758.427060] [<ffff20000808aad4>] do_notify_resume+0x6c/0x88 [ 758.432608] [<ffff200008083624>] work_pending+0x10/0x14 [ 758.437812] Code: 9ac32042 8b010001 d1000443 8a230000 (d50b7e20) [ 758.444093] ---[ end trace cdfa1c3f20ed57a1 ]--- [ 758.448709] Fixing recursive fault but reboot is needed! [ 770.500031] xgene-enet 1f610000.ethernet eth3: Link is Up - 10Gbps
I can reproduce this on Juno-r0 with 4.8-rc4 + defconfig + DEBUG_PAGEALLOC. I will take a look at it. Suzuki _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
