Kernel panics when task running with a SCHED_DEADLINE scheduling policy.

Issue

• Kernel panics with when an attempt is made to enable cpuset in cgroup V2 with a task running with deadline scheduling policy.

[80468.182258] BUG: unable to handle page fault for address: ffffffff8b6648b0
[80468.183798] #PF: supervisor read access in kernel mode
[80468.185011] #PF: error_code(0x0000) - not-present page
[80468.186214] PGD 1a215067 P4D 1a215067 PUD 1a216063 PMD 1b5ff063 PTE 800fffffe539b060
[80468.187418] Oops: 0000 [#1] PREEMPT SMP PTI
[80468.188594] CPU: 1 PID: 9812 Comm: bash Kdump: loaded Not tainted 5.14.0-124.el9.x86_64 #1
[80468.189806] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/05/2016
[80468.191019] RIP: 0010:dl_cpu_busy+0x30/0x2b0
[80468.192196] Code: 57 41 56 41 55 41 54 55 53 48 83 ec 18 48 89 34 24 65 ff 05 12 e8 cc 76 4c 63 f7 48 c7 c0 80 8e 02 00 4a 8b 14 f5 e0 0a 61 8a <4c> 8b bc 02 30 0a 00 00 49 8d 47 40 48 89 c7 48 89 44 24 08 e8 37
[80468.194585] RSP: 0018:ffffa1be80d07b50 EFLAGS: 00010282
[80468.195762] RAX: 0000000000028e80 RBX: ffffa1be80d07c50 RCX: 0000000000000040
[80468.196928] RDX: ffffffff8b63b000 RSI: ffff895cb5a38000 RDI: 0000000000000002
[80468.198091] RBP: ffff895cb5a38000 R08: 0000000000000000 R09: 0000000000000000
[80468.199237] R10: 0000000000000002 R11: 0000000000000001 R12: ffff895c86036c00
[80468.200356] R13: 0000000000000000 R14: 0000000000000002 R15: ffff895c830b2000
[80468.201464] FS:  00007f49a3230740(0000) GS:ffff895cffd00000(0000) knlGS:0000000000000000
[80468.202572] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[80468.203676] CR2: ffffffff8b6648b0 CR3: 000000001cdac002 CR4: 00000000007706e0
[80468.204789] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[80468.205874] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[80468.206919] PKRU: 55555554
[80468.207946] Call Trace:
[80468.208947]  cpuset_can_attach+0xa0/0x140
[80468.209953]  cgroup_migrate_execute+0x8c/0x490
[80468.210931]  cgroup_update_dfl_csses+0x254/0x270
[80468.211898]  cgroup_subtree_control_write+0x322/0x400
[80468.212854]  kernfs_fop_write_iter+0x11c/0x1b0
[80468.213777]  new_sync_write+0x11f/0x1b0
[80468.214689]  vfs_write+0x1eb/0x280
[80468.215592]  ksys_write+0x5f/0xe0
[80468.216463]  do_syscall_64+0x5c/0x80
[80468.217332]  ? filp_close+0x59/0x70
[80468.218176]  ? syscall_exit_work+0x112/0x150
[80468.219000]  ? syscall_exit_to_user_mode+0x12/0x30
[80468.219814]  ? do_syscall_64+0x69/0x80
[80468.220597]  ? syscall_exit_work+0x112/0x150
[80468.221366]  ? syscall_exit_to_user_mode+0x12/0x30
[80468.222134]  ? do_syscall_64+0x69/0x80
[80468.222875]  ? do_syscall_64+0x69/0x80
[80468.223589]  ? asm_exc_page_fault+0x8/0x30
[80468.224287]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[80468.224965] RIP: 0033:0x7f49a3371d67
[80468.225644] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[80468.227030] RSP: 002b:00007ffea545f588 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[80468.227720] RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007f49a3371d67
[80468.228402] RDX: 0000000000000008 RSI: 00005592a56c5810 RDI: 0000000000000001
[80468.229066] RBP: 00005592a56c5810 R08: 0000000000000000 R09: 00007f49a33e34e0
[80468.229722] R10: 00007f49a33e33e0 R11: 0000000000000246 R12: 0000000000000008
[80468.230378] R13: 00007f49a342c780 R14: 0000000000000008 R15: 00007f49a34279e0