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SubjectNull pointer crash at find_idlest_group on db845c w/ linus/master
With today's linus/master on db845c running android, I'm able to
fairly easily reproduce the following crash. I've not had a chance to
bisect it yet, but I'm suspecting its connected to Vincent's recent
rework.

If you have any suggestions, or need me to test anything, please let me know.

thanks
-john

[ 136.157069] Unable to handle kernel NULL pointer dereference at
virtual address 0000000000000010
[ 136.165937] Mem abort info:
[ 136.168765] ESR = 0x96000005
[ 136.171862] EC = 0x25: DABT (current EL), IL = 32 bits
[ 136.177229] SET = 0, FnV = 0
[ 136.180320] EA = 0, S1PTW = 0
[ 136.183502] Data abort info:
[ 136.186426] ISV = 0, ISS = 0x00000005
[ 136.190302] CM = 0, WnR = 0
[ 136.193316] user pgtable: 4k pages, 39-bit VAs, pgdp=0000000175f7e000
[ 136.199814] [0000000000000010] pgd=0000000000000000, pud=0000000000000000
[ 136.206666] Internal error: Oops: 96000005 [#1] PREEMPT SMP
[ 136.212295] Modules linked in:
[ 136.215397] CPU: 7 PID: 50 Comm: kauditd Tainted: G W
5.4.0-mainline-11225-g9c5add21ff63 #1252
[ 136.225390] Hardware name: Thundercomm Dragonboard 845c (DT)
[ 136.231111] pstate: 60c00085 (nZCv daIf +PAN +UAO)
[ 136.235971] pc : find_idlest_group.isra.95+0x368/0x690
[ 136.241159] lr : find_idlest_group.isra.95+0x210/0x690
[ 136.246347] sp : ffffffc01036b890
[ 136.249708] x29: ffffffc01036b890 x28: ffffffe7d7450480
[ 136.255077] x27: ffffff80f81f0000 x26: 0000000000000000
[ 136.260445] x25: 0000000000000000 x24: ffffffc01036b998
[ 136.265810] x23: ffffff80f8e40a00 x22: ffffffe7d7719e30
[ 136.271175] x21: ffffff80f8f16520 x20: ffffff80f8f16180
[ 136.276539] x19: ffffffe7d771a610 x18: ffffffe7d71d1ef0
[ 136.281908] x17: 0000000000000000 x16: 0000000000000000
[ 136.287274] x15: 0000000000000001 x14: 6f3a753d74786574
[ 136.292644] x13: 6e6f637420383637 x12: 632c323135633a30
[ 136.298007] x11: 0000000000000070 x10: 0000000000000002
[ 136.303371] x9 : 0000000000000000 x8 : 0000000000000075
[ 136.308737] x7 : ffffff80f8f16000 x6 : ffffffe7d7450000
[ 136.314099] x5 : 0000000000000004 x4 : 0000000000000000
[ 136.319465] x3 : 000000000000025c x2 : ffffff80f8f16780
[ 136.324836] x1 : 0000000000000000 x0 : 0000000000000002
[ 136.330198] Call trace:
[ 136.332680] find_idlest_group.isra.95+0x368/0x690
[ 136.337528] select_task_rq_fair+0x4e4/0xd88
[ 136.341848] try_to_wake_up+0x21c/0x7f8
[ 136.345735] default_wake_function+0x34/0x48
[ 136.350053] pollwake+0x98/0xc8
[ 136.353233] __wake_up_common+0x90/0x158
[ 136.357202] __wake_up_common_lock+0x88/0xd0
[ 136.361519] __wake_up_sync_key+0x40/0x50
[ 136.365584] sock_def_readable+0x44/0x78
[ 136.369560] __netlink_sendskb+0x44/0x58
[ 136.373525] netlink_unicast+0x220/0x258
[ 136.377496] kauditd_send_queue+0xa4/0x158
[ 136.381643] kauditd_thread+0xf4/0x248
[ 136.385438] kthread+0x130/0x138
[ 136.388706] ret_from_fork+0x10/0x1c
[ 136.392332] Code: 54001340 7100081f 540016e1 a9478ba1 (f9400821)
[ 136.398493] ---[ end trace 47d254973801b2c4 ]---
[ 136.403162] Kernel panic - not syncing: Fatal exception
[ 136.408445] SMP: stopping secondary CPUs
[ 136.412440] Kernel Offset: 0x27c6200000 from 0xffffffc010000000
[ 136.418417] PHYS_OFFSET: 0xffffffe140000000
[ 136.422655] CPU features: 0x00002,2a80a218

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