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SubjectKernel Panics on Xen ARM64 for Domain0 and Guest
Date
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
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