** Summary changed:

- kernel taint ( warning ) caused by smpboot.c: on 5.4.0 
+ [SRU]x86, sched: Treat Intel SNC topology as default, COD as exception

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https://bugs.launchpad.net/bugs/1976511

Title:
  [SRU]x86, sched: Treat Intel SNC topology as default, COD as exception

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] ------------[ cut here 
]------------
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] sched: CPU #20's llc-sibling 
CPU #0 is not on the same node! [node: 1 != 0]. Ignoring dependency.
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] WARNING: CPU: 20 PID: 0 at 
/build/linux-hwe-5.4-9Mb2g5/linux-hwe-5.4-5.4.0/arch/x86/kernel/smpboot.c:426 
topology_sane.isra.9+0x6c/0x70
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] Modules linked in:
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] CPU: 20 PID: 0 Comm: 
swapper/20 Not tainted 5.4.0-107-generic #121~18.04.1-Ubuntu
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] Hardware name: GIGABYTE 
G292-280-00/MG52-G20-00, BIOS F02 10/28/2021
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] RIP: 
0010:topology_sane.isra.9+0x6c/0x70
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] Code: 41 5c 5d c3 80 3d 1e 75 
ba 01 00 75 ec 89 f1 41 89 d9 89 fe 45 89 e0 48 c7 c7 b8 00 b4 a6 c6 05 04 75 
ba 01 01 e8 b4 c7 03 00
   <0f> 0b eb cb 0f 1f 44 00 00 55 0f b6 05 a3 8d f0 01 c6 05 9c 8d f0
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] RSP: 0000:ffffb76b58e17eb8 
EFLAGS: 00010086
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] RAX: 0000000000000000 RBX: 
0000000000000000 RCX: ffffffffa7264e88
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] RDX: ffffffffa7264e88 RSI: 
0000000000000096 RDI: 0000000000000046
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] RBP: ffffb76b58e17ec8 R08: 
0000000000000000 R09: 000000000002f680
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] R10: ffff8b69bf800000 R11: 
00000000000002c0 R12: 0000000000000001
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] R13: 0000000000000014 R14: 
0000000000000014 R15: 0000000000000002
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] FS:  0000000000000000(0000) 
GS:ffff8b69bf800000(0000) knlGS:0000000000000000
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] CR2: 0000000000000000 CR3: 
0000007ee1a0a001 CR4: 0000000000760ee0
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] DR0: 0000000000000000 DR1: 
0000000000000000 DR2: 0000000000000000
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] DR3: 0000000000000000 DR6: 
00000000fffe0ff0 DR7: 0000000000000400
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] PKRU: 00000000
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] Call Trace:
  Apr  6 02:33:31 G292-280 kernel: [    0.007531]  
set_cpu_sibling_map+0x14f/0x600
  Apr  6 02:33:31 G292-280 kernel: [    0.007531]  start_secondary+0x6e/0x1c0
  Apr  6 02:33:31 G292-280 kernel: [    0.007531]  
secondary_startup_64+0xa4/0xb0
  Apr  6 02:33:31 G292-280 kernel: [    0.007531] ---[ end trace 
789d1f3abd3d96d4 ]---

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