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[Magali Lemes do Sacramento <2029917@xxxxxxxxxxxxxxxxxx>]

Similarly, the following tests also fail (crash the instance) on j/gcp-fips with version 5.15.0-1048.56+fips1 during development cycle d2024.01.02 on the n2d-standard-4.sev_snp instance:
 - cpuhotplug:cpuhotplug02 in ubuntu_ltp and 
 - cpu-hotplug:cpu-on-off-test.sh in ubuntu_kernel_selftests

If necessary, another bug could be filed targeting GCP specifically.

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Title:
  [Potential Regression] cpuhotplug related tests triggers kernel bug
  (arch/x86/xen/spinlock.c:62) and kernel panic on AWS cloud c3.xlarge

Status in ubuntu-kernel-tests:
  New
Status in linux-aws package in Ubuntu:
  Invalid
Status in linux-aws source package in Bionic:
  Confirmed
Status in linux-aws source package in Focal:
  Confirmed

Bug description:
  Issue found with 5.4.0-1107.115~18.04.1 Bionic AWS and 5.4.0-1107.115
  Focal AWS kernel, on c3.xlarge instance only.

  cpu-hotplug related tests will crash the instance, they are:
  * cpuset_hotplug in ubuntu_ltp_controllers
  * cpuhotplug:cpuhotplug02 in ubuntu_ltp (comment #7 in this bug)
  * cpu-hotplug:cpu-on-off-test.sh in ubuntu_kernel_selftests (comment #8 in this bug)

  Take cpuset_hotplug in ubuntu_ltp_controllers for example.

  There is no output from the test itself (looks like it has crashed):
   START   ubuntu_ltp_controllers.cpuset_hotplug   ubuntu_ltp_controllers.cpuset_hotplug   timestamp=1689920544    timeout=4500    localtime=Jul 21 06:22:24
   Persistent state client._record_indent now set to 2
   Persistent state client.unexpected_reboot now set to ('ubuntu_ltp_controllers.cpuset_hotplug', 'ubuntu_ltp_controllers.cpuset_hotplug')
   Waiting for pid 925631 for 4500 seconds
   System python is too old, crash handling disabled
  (nothing after this point)

  But from the console log you will see a kernel BUG and kernel panic:
  [ 3451.829941] kernel BUG at /build/linux-aws-5.4-I38rpz/linux-aws-5.4-5.4.0/arch/x86/xen/spinlock.c:62!
  [ 3451.833383] invalid opcode: 0000 [#1] SMP PTI
  [ 3451.835146] CPU: 1 PID: 14 Comm: cpuhp/1 Tainted: G         C        5.4.0-1107-aws #115~18.04.1-Ubuntu
  [ 3451.838679] Hardware name: Xen HVM domU, BIOS 4.11.amazon 08/24/2006
  [ 3451.840965] RIP: 0010:dummy_handler+0x4/0x10
  [ 3451.842675] Code: 8b 75 e4 74 d6 44 89 e7 e8 39 89 61 00 eb d6 44 89 e7 e8 af ab 61 00 eb cc 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 80 3d 69 d0 9f 01 00 75 02 f3
  [ 3451.849042] RSP: 0000:ffffb54b0000ee38 EFLAGS: 00010046
  [ 3451.851021] RAX: ffffffff92c2e3d0 RBX: 000000000000003b RCX: 0000000000000000
  [ 3451.853509] RDX: 0000000000400e00 RSI: 0000000000000000 RDI: 000000000000003b
  [ 3451.855996] RBP: ffffb54b0000ee38 R08: ffff8a9de6c01240 R09: ffff8a9de6c01440
  [ 3451.858435] R10: 0000000000000000 R11: ffffffff94664da8 R12: 0000000000000000
  [ 3451.860896] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8a9de6583200
  [ 3451.863313] FS:  0000000000000000(0000) GS:ffff8a9de8040000(0000) knlGS:0000000000000000
  [ 3451.899246] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 3451.901338] CR2: 0000000000000000 CR3: 000000002040a001 CR4: 00000000001606e0
  [ 3451.903757] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [ 3451.906184] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [ 3451.908623] Call Trace:
  [ 3451.909869]  <IRQ>
  [ 3451.911014]  __handle_irq_event_percpu+0x44/0x1a0
  [ 3451.912818]  handle_irq_event_percpu+0x32/0x80
  [ 3451.914578]  handle_percpu_irq+0x3d/0x60
  [ 3451.916198]  generic_handle_irq+0x28/0x40
  [ 3451.917834]  handle_irq_for_port+0x8f/0xe0
  [ 3451.919493]  evtchn_2l_handle_events+0x157/0x270
  [ 3451.921298]  __xen_evtchn_do_upcall+0x76/0xe0
  [ 3451.923046]  xen_evtchn_do_upcall+0x2b/0x40
  [ 3451.924742]  xen_hvm_callback_vector+0xf/0x20
  [ 3451.926484]  </IRQ>
  [ 3451.927632] RIP: 0010:_raw_spin_unlock_irqrestore+0x15/0x20
  [ 3451.929674] Code: e8 a0 3d 64 ff 4c 29 e0 4c 39 f0 76 cf 80 0b 08 eb 8a 90 90 90 0f 1f 44 00 00 55 48 89 e5 e8 d6 ad 66 ff 66 90 48 89 f7 57 9d <0f> 1f 44 00 00 5d c3 0f 1f 40 00 0f 1f 44 00 00 55 48 89 e5 c6 07
  [ 3451.935996] RSP: 0000:ffffb54b000fbcf8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff0c
  [ 3451.939023] RAX: 0000000000000001 RBX: ffff8a9de6583200 RCX: 000000000002cc00
  [ 3451.941475] RDX: 0000000000000001 RSI: 0000000000000246 RDI: 0000000000000246
  [ 3451.943948] RBP: ffffb54b000fbcf8 R08: ffff8a9de6c01240 R09: ffff8a9de6c01440
  [ 3451.946382] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000003b
  [ 3451.948849] R13: 0000000000000000 R14: ffff8a9d8e75c600 R15: ffff8a9d8e75c6a4
  [ 3451.951297]  __setup_irq+0x456/0x760
  [ 3451.952850]  ? kmem_cache_alloc_trace+0x170/0x230
  [ 3451.954661]  request_threaded_irq+0xfb/0x160
  [ 3451.956376]  bind_ipi_to_irqhandler+0xba/0x1c0
  [ 3451.958113]  ? xen_qlock_wait+0x90/0x90
  [ 3451.959723]  ? snr_uncore_mmio_init+0x20/0x20
  [ 3451.961445]  xen_init_lock_cpu+0x78/0xd0
  [ 3451.963057]  ? snr_uncore_mmio_init+0x20/0x20
  [ 3451.964810]  xen_cpu_up_online+0xe/0x20
  [ 3451.966415]  cpuhp_invoke_callback+0x8a/0x580
  [ 3451.968144]  cpuhp_thread_fun+0xb8/0x120
  [ 3451.969760]  smpboot_thread_fn+0xfc/0x170
  [ 3451.971400]  kthread+0x121/0x140
  [ 3451.972855]  ? sort_range+0x30/0x30
  [ 3451.974378]  ? kthread_park+0x90/0x90
  [ 3451.975929]  ret_from_fork+0x35/0x40
  [ 3451.977454] Modules linked in: exfat(C) ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs nfsd auth_rpcgss nfs_acl lockd grace sunrpc nls_iso8859_1 binfmt_misc serio_raw sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper ixgbevf
  [ 3451.992926] ---[ end trace 4433bc23c8979a4c ]---
  [ 3451.994720] RIP: 0010:dummy_handler+0x4/0x10
  [ 3451.996427] Code: 8b 75 e4 74 d6 44 89 e7 e8 39 89 61 00 eb d6 44 89 e7 e8 af ab 61 00 eb cc 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 80 3d 69 d0 9f 01 00 75 02 f3
  [ 3452.002753] RSP: 0000:ffffb54b0000ee38 EFLAGS: 00010046
  [ 3452.004708] RAX: ffffffff92c2e3d0 RBX: 000000000000003b RCX: 0000000000000000
  [ 3452.007130] RDX: 0000000000400e00 RSI: 0000000000000000 RDI: 000000000000003b
  [ 3452.009569] RBP: ffffb54b0000ee38 R08: ffff8a9de6c01240 R09: ffff8a9de6c01440
  [ 3452.011998] R10: 0000000000000000 R11: ffffffff94664da8 R12: 0000000000000000
  [ 3452.014449] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8a9de6583200
  [ 3452.016893] FS:  0000000000000000(0000) GS:ffff8a9de8040000(0000) knlGS:0000000000000000
  [ 3452.020028] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 3452.022109] CR2: 0000000000000000 CR3: 000000002040a001 CR4: 00000000001606e0
  [ 3452.024568] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [ 3452.027003] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [ 3452.029446] Kernel panic - not syncing: Fatal exception in interrupt
  [ 3452.031753] Kernel Offset: 0x11c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

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