【OLK-5.10】解决混部场景下，出现空指针引用问题

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9 do_el0_svc+0x50/0x11c arch/arm64/kernel/syscall.c:217                          
 10  el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:353                        
 11  el0_sync_handler+0xe4/0x1e0 arch/arm64/kernel/entry-common.c:369              
 12  el0_sync+0x148/0x180 arch/arm64/kernel/entry.S:683                            
 13 ==================================================================             
 14 BUG: KASAN: null-ptr-deref in rq_of kernel/sched/sched.h:1118 [inline]         
 15 BUG: KASAN: null-ptr-deref in unthrottle_qos_sched_group kernel/sched/fair.c:7619 [inline]
 16 BUG: KASAN: null-ptr-deref in free_fair_sched_group+0x124/0x320 kernel/sched/fair.c:12131
  1 sched: Fix null-ptr-deref in free_fair_sched_group                             
  2                                                                                
  3 hulk inclusion                                                                 
  4 category: bugfix                                                               
  5 bugzilla: 187419                                                               
  6                                                                                
  7 -------------------------------                                                
  8                                                                                
  9 do_el0_svc+0x50/0x11c arch/arm64/kernel/syscall.c:217                          
 10  el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:353                        
 11  el0_sync_handler+0xe4/0x1e0 arch/arm64/kernel/entry-common.c:369              
 12  el0_sync+0x148/0x180 arch/arm64/kernel/entry.S:683                            
 13 ==================================================================             
 14 BUG: KASAN: null-ptr-deref in rq_of kernel/sched/sched.h:1118 [inline]         
 15 BUG: KASAN: null-ptr-deref in unthrottle_qos_sched_group kernel/sched/fair.c:7619 [inline]
 16 BUG: KASAN: null-ptr-deref in free_fair_sched_group+0x124/0x320 kernel/sched/fair.c:12131
 17 Read of size 8 at addr 0000000000000130 by task syz-executor100/223            
 18                                                                                
 19 CPU: 3 PID: 223 Comm: syz-executor100 Not tainted 5.10.0 #6                    
 20 Hardware name: linux,dummy-virt (DT)                                           
 21 Call trace:                                                                    
 22  dump_backtrace+0x0/0x40c arch/arm64/kernel/stacktrace.c:132                   
 23  show_stack+0x30/0x40 arch/arm64/kernel/stacktrace.c:196                       
 24  __dump_stack lib/dump_stack.c:77 [inline]                                     
 25  dump_stack+0x1b4/0x248 lib/dump_stack.c:118                                   
 26  __kasan_report mm/kasan/report.c:551 [inline]                                 
 27  kasan_report+0x18c/0x210 mm/kasan/report.c:564                                
 28  check_memory_region_inline mm/kasan/generic.c:187 [inline]                    
 29  __asan_load8+0x98/0xc0 mm/kasan/generic.c:253                                 
 30  rq_of kernel/sched/sched.h:1118 [inline]                                      
 31  unthrottle_qos_sched_group kernel/sched/fair.c:7619 [inline]                  
 32  free_fair_sched_group+0x124/0x320 kernel/sched/fair.c:12131                   
 33  sched_free_group kernel/sched/core.c:7767 [inline]                            
 34  sched_create_group+0x48/0xc0 kernel/sched/core.c:7798                         
 35  cpu_cgroup_css_alloc+0x18/0x40 kernel/sched/core.c:7930                       
 36  css_create+0x7c/0x4a0 kernel/cgroup/cgroup.c:5328                             
 37  cgroup_apply_control_enable+0x288/0x340 kernel/cgroup/cgroup.c:3135           
 38  cgroup_apply_control kernel/cgroup/cgroup.c:3217 [inline]                     
 39  cgroup_subtree_control_write+0x668/0x8b0 kernel/cgroup/cgroup.c:3375          
 40  cgroup_file_write+0x1a8/0x37c kernel/cgroup/cgroup.c:3909                     
 41  kernfs_fop_write_iter+0x220/0x2f4 fs/kernfs/file.c:296                        
 42  call_write_iter include/linux/fs.h:1960 [inline]                              
 43  new_sync_write+0x260/0x370 fs/read_write.c:515                                
 44  vfs_write+0x3dc/0x4ac fs/read_write.c:602                                     
 45  ksys_write+0xfc/0x200 fs/read_write.c:655                                     
 46  __do_sys_write fs/read_write.c:667 [inline]                                   
 47  __se_sys_write fs/read_write.c:664 [inline]                                   
 48  __arm64_sys_write+0x50/0x60 fs/read_write.c:664                               
 49  __invoke_syscall arch/arm64/kernel/syscall.c:36 [inline]                      
 50  invoke_syscall arch/arm64/kernel/syscall.c:48 [inline]                        
 51  el0_svc_common.constprop.0+0xf4/0x414 arch/arm64/kernel/syscall.c:155         
 52  do_el0_svc+0x50/0x11c arch/arm64/kernel/syscall.c:217                         
 53  el0_svc+0x20/0x30 arch/arm64/kernel/entry-common.c:353                        
 54  el0_sync_handler+0xe4/0x1e0 arch/arm64/kernel/entry-common.c:369              
 55  el0_sync+0x148/0x180 arch/arm64/kernel/entry.S:68

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