"Hard LOCKUP" reported in copy_process() function

Issue

• NMI watchdog detected hard lockup on CPU XX and triggered the kernel panic.
• System crashed with the following call traces in the kernel ring buffer :

crash> log
[..]
[7953764.748132] Kernel panic - not syncing: Hard LOCKUP
[7953764.749826] CPU: 43 PID: 3535 Comm: cmf-agent Kdump: loaded Not tainted 3.10.0-862.11.6.el7.x86_64 #1
[7953764.751554] Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 05/21/2018
[7953764.753309] Call Trace:
[7953764.755037]  <NMI>  [<ffffffffa71135d4>] dump_stack+0x19/0x1b
[7953764.756816]  [<ffffffffa710d11f>] panic+0xe8/0x21f
[7953764.758545]  [<ffffffffa6a9432f>] nmi_panic+0x3f/0x40
[7953764.760249]  [<ffffffffa6b42d41>] watchdog_overflow_callback+0x121/0x140
[7953764.761921]  [<ffffffffa6b82857>] __perf_event_overflow+0x57/0x100
[7953764.763618]  [<ffffffffa6b8b254>] perf_event_overflow+0x14/0x20
[7953764.765290]  [<ffffffffa6a0a5d0>] intel_pmu_handle_irq+0x220/0x510
[7953764.766941]  [<ffffffffa6d511c8>] ? ioremap_page_range+0x2e8/0x480
[7953764.768531]  [<ffffffffa6bda144>] ? vunmap_page_range+0x234/0x470
[7953764.770084]  [<ffffffffa6e0f1a6>] ? ghes_copy_tofrom_phys+0x116/0x210
[7953764.771599]  [<ffffffffa6e0f340>] ? ghes_read_estatus+0xa0/0x190
[7953764.773059]  [<ffffffffa711c031>] perf_event_nmi_handler+0x31/0x50
[7953764.774482]  [<ffffffffa711d8cc>] nmi_handle.isra.0+0x8c/0x150
[7953764.775846]  [<ffffffffa711dba8>] do_nmi+0x218/0x460
[7953764.777168]  [<ffffffffa711cd69>] end_repeat_nmi+0x1e/0x81
[7953764.778447]  [<ffffffffa6b0ba66>] ? native_queued_spin_lock_slowpath+0x126/0x200
[7953764.779706]  [<ffffffffa6b0ba66>] ? native_queued_spin_lock_slowpath+0x126/0x200
[7953764.780924]  [<ffffffffa6b0ba66>] ? native_queued_spin_lock_slowpath+0x126/0x200
[7953764.782099]  <EOE>  [<ffffffffa710daee>] queued_spin_lock_slowpath+0xb/0xf
[7953764.783287]  [<ffffffffa6b0bccb>] queued_write_lock_slowpath+0x8b/0x90
[7953764.784471]  [<ffffffffa711b7d1>] _raw_qwrite_lock+0x21/0x30
[7953764.785648]  [<ffffffffa6a90bbb>] tasklist_write_lock_irq+0x3b/0x50
[7953764.786838]  [<ffffffffa6a92f07>] copy_process+0x1477/0x1a40
[7953764.788025]  [<ffffffffa6a93681>] do_fork+0x91/0x320
[7953764.789200]  [<ffffffffa6a93996>] SyS_clone+0x16/0x20
[7953764.790381]  [<ffffffffa7125b64>] stub_clone+0x44/0x70
[7953764.791551]  [<ffffffffa712579b>] ? system_call_fastpath+0x22/0x27
[..]