Logs shows "SysRq : Power Off" prior to an unexpected system shutdown.

Issue

• Messages logs, Serial console logs or pstore logs shows SysRq : Power Off events post which system gets shutdown unexpectedly.

[2214373.333104] sysrq: SysRq : Power Off
[2214373.337218] sysrq: SysRq : Power Off
[2214373.725432] ACPI: PM: Preparing to enter system sleep state S5
[2214373.729672] reboot: Power down
[2214373.734568] WARNING: CPU: 0 PID: 3613808 at arch/x86/kernel/cpu/mce/intel.c:122 lmce_supported+0x51/0x60
[2214373.741834] Modules linked in: mptcp_diag xsk_diag raw_diag unix_diag af_packet_diag netlink_diag udp_diag overlay tcp_diag inet_diag nfsd nfs_acl softdog sg binfmt_misc rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache loop intel_rapl_msr intel_rapl_common intel_uncore_frequency_common isst_if_common nfit libnvdimm ppdev rapl parport_pc pcspkr i2c_piix4 parport xfs libcrc32c crct10dif_pclmul crc32_pclmul crc32c_intel nvme nvme_core ena ghash_clmulni_intel serio_raw t10_pi dm_multipath sunrpc dm_mirror dm_region_hash dm_log dm_mod be2iscsi bnx2i cnic uio cxgb4i cxgb4 tls libcxgbi libcxgb qla4xxx iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi fuse
[2214373.780897] Red Hat flags: eBPF/event
[2214373.784163] CPU: 0 PID: 3613808 Comm: kworker/0:0 Not tainted 4.18.0-477.74.1.el8_8.x86_64 #1
[2214373.790905] Hardware name: Amazon EC2 c5.xlarge/, BIOS 1.0 10/16/2017
[2214373.795342] Workqueue: events do_poweroff
[2214373.798814] RIP: 0010:lmce_supported+0x51/0x60
[2214373.802425] Code: 08 31 c0 5b c3 cc cc cc cc bf 3a 00 00 00 e8 56 e8 02 00 66 90 49 89 c0 48 89 c3 49 c1 e8 14 44 89 c0 83 e0 01 83 e3 01 75 d9 <0f> 0b 31 c0 eb d3 31 c0 c3 cc cc cc cc 66 90 0f 1f 44 00 00 41 56
[2214373.815050] RSP: 0018:ffffa49043687e50 EFLAGS: 00010046
[2214373.818988] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000003a
[2214373.825247] RDX: 0000000000000000 RSI: 00000000000000ff RDI: 000000000000003a
[2214373.831543] RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000029
[2214373.837855] R10: 0000000000000001 R11: ffffa49043687cb8 R12: ffff936961c38900
[2214373.844187] R13: 0000000000000000 R14: ffff936849837780 R15: ffffffffb52631a8
[2214373.850473] FS:  0000000000000000(0000) GS:ffff936961c00000(0000) knlGS:0000000000000000
[2214373.857128] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2214373.861290] CR2: 00001518ac7e2080 CR3: 000000021e810006 CR4: 00000000007706f0
[2214373.867611] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[2214373.873898] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[2214373.880249] PKRU: 55555554
[2214373.883129] Call Trace:
[2214373.885947]  mce_intel_feature_clear+0xb/0x50
[2214373.889524]  native_stop_other_cpus+0xcc/0x160
[2214373.893126]  native_machine_shutdown+0x22/0x40
[2214373.896770]  native_machine_power_off+0x36/0x40
[2214373.900429]  process_one_work+0x1a7/0x360
[2214373.903843]  ? create_worker+0x1a0/0x1a0
[2214373.907265]  worker_thread+0x30/0x390
[2214373.910551]  ? create_worker+0x1a0/0x1a0
[2214373.913945]  kthread+0x134/0x150
[2214373.917083]  ? set_kthread_struct+0x50/0x50
[2214373.920584]  ret_from_fork+0x35/0x40
[2214373.923802] ---[ end trace b02c2010d2bf144e ]---