Hi, I have found a commit in "PER-CPU MEMORY ALLOCATOR" will panic the kernels that are runing on ARM64 Xen (include Domain0 and Guest). commit 3ca45a46f8af8c4a92dd8a08eac57787242d5021 percpu: ensure the requested alignment is power of two If I revert this commit, the Kernels can work properly on ARM64 Xen. The following is the log: [ 0.385467] Detected PIPT I-cache on CPU1 [ 0.391064] CPU1: Booted secondary processor [411fd072] [ 0.421553] Detected PIPT I-cache on CPU2 [ 0.427149] CPU2: Booted secondary processor [411fd072] [ 0.457643] Detected PIPT I-cache on CPU3 [ 0.463236] CPU3: Booted secondary processor [411fd072] [ 0.493737] Detected PIPT I-cache on CPU4 [ 0.499331] CPU4: Booted secondary processor [411fd072] [ 0.529825] Detected PIPT I-cache on CPU5 [ 0.535416] CPU5: Booted secondary processor [411fd072] [ 0.565918] Detected PIPT I-cache on CPU6 [ 0.571513] CPU6: Booted secondary processor [411fd072] [ 0.602006] Detected PIPT I-cache on CPU7 [ 0.607597] CPU7: Booted secondary processor [411fd072] [ 0.607645] Brought up 8 CPUs [ 0.676227] SMP: Total of 8 processors activated. [ 0.681009] CPU features: detected feature: 32-bit EL0 Support [ 0.687007] CPU: All CPU(s) started at EL1 [ 0.691126] alternatives: patching kernel code [ 0.697383] devtmpfs: initialized [ 0.701439] DMI not present or invalid. [ 0.705290] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns [ 0.715243] pinctrl core: initialized pinctrl subsystem [ 0.720696] NET: Registered protocol family 16 [ 0.725396] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 0.733391] pgd = ffff000008bfd000 [ 0.736852] [00000000] *pgd=000000823fffe003[ 0.740941] Internal error: Oops: 96000004 [#1] PREEMPT SMP [ 0.746577] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 4.9.0-rc1-00001-g3ca45a4 #69 [ 0.755430] Hardware name: AMD Seattle (Rev.B0) Development Board (Overdrive) (DT) [ 0.763067] task: ffff8001f6cb8000 task.stack: ffff8001f6ca4000 [ 0.769060] PC is at bind_evtchn_to_irq+0x1c/0x108 [ 0.773917] LR is at bind_evtchn_to_irqhandler+0x28/0x90 [ 0.779298] pc : [<ffff000008483124>] lr : [<ffff000008483498>] pstate: 60000045 [ 0.786765] sp : ffff8001f6ca7cc0 [ 0.790147] x29: ffff8001f6ca7cc0 [ 0.793359] x28: 0000000000000000 [ 0.796834] [ 0.798393] x27: ffff000008af8f60 [ 0.801605] x26: ffff000008ac3d78 [ 0.805077] [ 0.806639] x25: ffff000008a76fb0 [ 0.809851] x24: ffff000008a804e4 [ 0.813323] [ 0.814885] x23: ffff000008b726e8 [ 0.818101] x22: ffff000008a123e8 [ 0.821569] [ 0.823131] x21: 0000000000000001 [ 0.826343] x20: ffff000008bd7000 [ 0.829815] [ 0.831377] x19: ffff000008486608 [ 0.834589] x18: 0000000000000000 [ 0.838061] [ 0.839623] x17: 00000000105d2c2d [ 0.842835] x16: 00000000deadbeef [ 0.846310] [ 0.847869] x15: ffff8001f6c2691c [ 0.851081] x14: ffffffffffffffff [ 0.854553] [ 0.856115] x13: ffff8001f6c26150 [ 0.859327] x12: 0000000000000008 [ 0.862799] [ 0.864361] x11: 0101010101010101 [ 0.867573] x10: 7f7f7f7f7f7f7f7f [ 0.871048] [ 0.872607] x9 : ffff8001fff2b458 [ 0.875819] x8 : ffff7e0007d930c0 [ 0.879291] [ 0.880853] x7 : 0000000000000000 [ 0.884065] x6 : 0000000003ffffff [ 0.887537] [ 0.889099] x5 : 0000000000000000 [ 0.892315] x4 : ffff000008b726e8 [ 0.895783] [ 0.897345] x3 : ffff000008a123e8 [ 0.900557] x2 : 0000000000000000 [ 0.904029] [ 0.905591] x1 : ffff000008bd7000 [ 0.908803] x0 : 0000000000000000 [ 0.912275] [ 0.913837] [ 0.915401] Process swapper/0 (pid: 1, stack limit = 0xffff8001f6ca4020) [ 0.922171] Stack: (0xffff8001f6ca7cc0 to 0xffff8001f6ca8000) [ 0.927987] 7cc0: ffff8001f6ca7cf0 ffff000008483498 ffff000008486608 ffff000008bd7000 [ 0.935889] 7ce0: 0000000000000000 0000000000000000 ffff8001f6ca7d30 ffff000008486a94 [ 0.943784] 7d00: 0000000000000000 ffff000008bd7000 ffff8001f64c3000 ffff000008bd73b8 [ 0.951683] 7d20: ffff000008b31000 ffff00000822de1c ffff8001f6ca7d50 ffff000008488218 [ 0.959582] 7d40: ffff000008bd72b8 ffff000008bd73b8 ffff8001f6ca7d80 ffff000008aa8fc8 [ 0.967484] 7d60: 0000000000000000 ffff000008bd7000 ffff8001f6ca7d80 ffff000008aa8e50 [ 0.975379] 7d80: ffff8001f6ca7dd0 ffff000008a80c6c ffff8001f6ca4000 ffff000008aa8d70 [ 0.983278] 7da0: ffff000008ac3da8 0000000000000000 ffff000008bae000 ffff000008a804e4 [ 0.991177] 7dc0: 000000017ff07ff0 ffff000008a80c6c ffff8001f6ca7e40 ffff000008a80ea0 [ 0.999081] 7de0: 000000000000012b ffff000008bae000 ffff000008ac3da8 0000000000000002 [ 1.006975] 7e00: ffff000008af8f00 0000000000000000 ffff8001f6ca7e40 ffff0000089b7f10 [ 1.014873] 7e20: 0000000200000002 0000000000000000 0000000000000000 ffff000008a76fb0 [ 1.022772] 7e40: ffff8001f6ca7ea0 ffff000008815698 ffff000008815688 0000000000000000 [ 1.030675] 7e60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.038570] 7e80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.046469] 7ea0: 0000000000000000 ffff000008082b30 ffff000008815688 0000000000000000 [ 1.054367] 7ec0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.062270] 7ee0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.070165] 7f00: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.078064] 7f20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.085962] 7f40: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.093865] 7f60: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.101760] 7f80: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.109659] 7fa0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.117557] 7fc0: 0000000000000000 0000000000000005 0000000000000000 0000000000000000 [ 1.125460] 7fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 1.133355] Call trace: [ 1.135876] Exception stack(0xffff8001f6ca7af0 to 0xffff8001f6ca7c20) [ 1.142383] 7ae0: ffff000008486608 0001000000000000 [ 1.150282] 7b00: ffff8001f6ca7cc0 ffff000008483124 ffff000008bd2cf0 ffff000008a1ad00 [ 1.158180] 7b20: 0000000000000001 ffff8001f6c10190 ffff8001f6ca7c20 ffff000008158648 [ 1.166079] 7b40: ffff000008baf000 00000000024080c0 0000000000000000 0000000000000000 [ 1.173978] 7b60: ffff000008b25b18 ffff000008b25000 ffff000008a76fb0 0000000000000001 [ 1.181880] 7b80: 00000000024080c0 0000000000000000 0000000000000000 ffff000008bd7000 [ 1.189775] 7ba0: 0000000000000000 ffff000008a123e8 ffff000008b726e8 0000000000000000 [ 1.197674] 7bc0: 0000000003ffffff 0000000000000000 ffff7e0007d930c0 ffff8001fff2b458 [ 1.205573] 7be0: 7f7f7f7f7f7f7f7f 0101010101010101 0000000000000008 ffff8001f6c26150 [ 1.213472] 7c00: ffffffffffffffff ffff8001f6c2691c 00000000deadbeef 00000000105d2c2d [ 1.221372] [<ffff000008483124>] bind_evtchn_to_irq+0x1c/0x108 [ 1.227274] [<ffff000008483498>] bind_evtchn_to_irqhandler+0x28/0x90 [ 1.233698] [<ffff000008486a94>] xb_init_comms+0x6c/0xf8 [ 1.239078] [<ffff000008488218>] xs_init+0xa8/0x1d0 [ 1.244028] [<ffff000008aa8fc8>] xenbus_init+0x258/0x2e4 [ 1.249408] [<ffff000008a80c6c>] do_one_initcall+0x84/0x114 [ 1.255050] [<ffff000008a80ea0>] kernel_init_freeable+0x1a4/0x244 [ 1.261212] [<ffff000008815698>] kernel_init+0x10/0x100 [ 1.266507] [<ffff000008082b30>] ret_from_fork+0x10/0x20 [ 1.271889] Code: f90013f5 2a0003f5 f9414820 a90153f3 (f9400000) [ 1.278065] ---[ end trace 1a0c84ed669d59e3 ]--- [ 1.282747] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 1.282747] [ 1.292025] SMP: stopping secondary CPUs [ 1.296045] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b -- Regards, Wei Chen IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. 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