模块 `gab` 导致系统崩溃，CPU 忙于处理 `dmp_get_shared_lock`

問題

• 系统崩溃，有以下日志信息

...
[167113.851237] GAB WARNING V-15-1-20035 Port h attempting to kill process due to client process failure
[167129.203968] GAB WARNING V-15-1-20035 Port h attempting to kill process due to client process failure
[167159.739855] GAB WARNING V-15-1-20138 Port h isolated due to client process failure
[167281.621900] Kernel panic - not syncing: GAB: Port h halting system due to client process failure at [14:1120]             
[167281.622270] CPU: 8 PID: 32144 Comm: vxconfigd Kdump: loaded Tainted: P           OE  ------------   3.10.0-957.10.1.el7.x86_64 #1
[167281.625361] Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30 01/23/2021
[167281.625602] Call Trace:
[167281.625721]  <IRQ>  [<ffffffff94b62e41>] dump_stack+0x19/0x1b
[167281.625855]  [<ffffffff94b5c550>] panic+0xe8/0x21f
[167281.625983]  [<ffffffffc07aaa04>] gab_halt+0x74/0x80 [gab]
[167281.626109]  [<ffffffffc07aacb3>] gab_kill_process+0x2a3/0x360 [gab]
[167281.626237]  [<ffffffffc07aaa10>] ? gab_halt+0x80/0x80 [gab]
[167281.626368]  [<ffffffffc0791a15>] gab_timerscan+0x165/0x530 [gab]
[167281.626497]  [<ffffffffc07918b0>] ? gab_mlist_empty+0x20/0x20 [gab]
[167281.626628]  [<ffffffff944a7f98>] call_timer_fn+0x38/0x110
[167281.626758]  [<ffffffffc07918b0>] ? gab_mlist_empty+0x20/0x20 [gab]
[167281.626887]  [<ffffffff944aa3fd>] run_timer_softirq+0x24d/0x300
[167281.627015]  [<ffffffff944a0f45>] __do_softirq+0xf5/0x280
[167281.627143]  [<ffffffff94b7932c>] call_softirq+0x1c/0x30
[167281.627273]  [<ffffffff9442e675>] do_softirq+0x65/0xa0
[167281.627402]  [<ffffffff944a12c5>] irq_exit+0x105/0x110
[167281.627528]  [<ffffffff94b7a6c8>] smp_apic_timer_interrupt+0x48/0x60
[167281.627659]  [<ffffffff94b76df2>] apic_timer_interrupt+0x162/0x170
[167281.627788]  <EOI>  [<ffffffff945e9888>] ? handle_pte_fault+0x5b8/0xd10
[167281.627921]  [<ffffffff945f881c>] ? unlink_anon_vmas+0x14c/0x1b0
[167281.628051]  [<ffffffff945111ba>] ? generic_exec_single+0xfa/0x1b0
[167281.628181]  [<ffffffff9447a400>] ? leave_mm+0x110/0x110
[167281.628309]  [<ffffffff9447a400>] ? leave_mm+0x110/0x110
[167281.628438]  [<ffffffff9447a400>] ? leave_mm+0x110/0x110
[167281.628566]  [<ffffffff945112cf>] smp_call_function_single+0x5f/0xa0
[167281.628695]  [<ffffffff94775b35>] ? cpumask_next_and+0x35/0x50
[167281.628826]  [<ffffffff9451187b>] smp_call_function_many+0x22b/0x270
[167281.628956]  [<ffffffff9447a5c8>] native_flush_tlb_others+0xb8/0xc0
[167281.629084]  [<ffffffff9447a638>] flush_tlb_mm_range+0x68/0x140
[167281.629213]  [<ffffffff945e4507>] tlb_flush_mmu.part.76+0x37/0xe0
[167281.629342]  [<ffffffff945e5e05>] tlb_finish_mmu+0x55/0x60
[167281.629468]  [<ffffffff945ef4a4>] unmap_region+0xf4/0x140
[167281.629596]  [<ffffffff94659a4f>] ? d_free+0x4f/0x70
[167281.629723]  [<ffffffff945efa61>] ? __vma_rb_erase+0x121/0x220
[167281.629851]  [<ffffffff945f1a95>] do_munmap+0x2a5/0x480
[167281.629978]  [<ffffffff945f1cd5>] vm_munmap+0x65/0xb0
[167281.630105]  [<ffffffff945f2f62>] SyS_munmap+0x22/0x30
[167281.630234]  [<ffffffff94b75ddb>] system_call_fastpath+0x22/0x27