GPF happens twice in the panic task's context, leading to the crash

Issue

• GPF happens twice in the panic task's context, leading to the crash

[  747.730184] general protection fault: 0000 [#1] SMP 
[  747.730216] Modules linked in: ...
[  747.730527] general protection fault: 0000 [#2] 
[  747.730527] SMP 
[  747.730528] 
[  747.730528] Modules linked in:
        ... 
[  747.730569] CPU: 5 PID: 27521 Comm: vxnetd Kdump: loaded Tainted: P           OE  ------------   3.10.0-1160.62.1.el7.x86_64 #1
[  747.730570] Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 09/13/2016
[  747.730571] task: ffff9aa97a1fd280 ti: ffff9aa97dd74000 task.ti: ffff9aa97dd74000
[  747.730572] RIP: 0010:[<ffffffff857fb8ba>] 
[  747.730578]  [<ffffffff857fb8ba>] fb_get_buffer_offset+0x7a/0xd0
[  747.730579] RSP: 0018:ffff9aa97dd77160  EFLAGS: 00010046
[  747.730580] RAX: 60925c0260925c02 RBX: 60925c0260925c02 RCX: 0000000060925c02
[  747.730581] RDX: 0000000000000020 RSI: ffff9a2d35cf1200 RDI: ffff9a2d35cf1000
[  747.730581] RBP: ffff9aa97dd77180 R08: 000000008124a002 R09: 0000000000000002
[  747.730582] R10: 0000000000000000 R11: ffff9aa97334c210 R12: 0000000000000020
[  747.730583] R13: 0000000000000000 R14: ffff9aa97a1a0c00 R15: 0000000000000010
[  747.730584] FS:  0000000000000000(0000) GS:ffff9aa97ed40000(0000) knlGS:0000000000000000
[  747.730586] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  747.730586] CR2: 00007f9b6cd8a000 CR3: 0000007ce1536000 CR4: 00000000003607e0
[  747.730588] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  747.730588] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  747.730589] Call Trace:
[  747.730595]  [<ffffffff8580c4d8>] soft_cursor+0x148/0x260
[  747.730598]  [<ffffffff8580bcd3>] bit_cursor+0x663/0x6a0
[  747.730600]  [<ffffffff85807fcd>] fbcon_cursor+0x13d/0x1c0
[  747.730602]  [<ffffffff8580b670>] ? bit_clear+0x120/0x120
[  747.730605]  [<ffffffff8587e883>] hide_cursor+0x33/0xa0
[  747.730607]  [<ffffffff85880308>] vt_console_print+0x3e8/0x430
[  747.730612]  [<ffffffff857925cb>] ? string.isra.7+0x3b/0xf0
[  747.730615]  [<ffffffff8549c6a3>] call_console_drivers.constprop.19+0x93/0xf0
[  747.730617]  [<ffffffff8549dd7b>] console_unlock+0x33b/0x4b0
[  747.730621]  [<ffffffff854cbefd>] ? down_trylock+0x2d/0x40
[  747.730622]  [<ffffffff8549e2b4>] vprintk_emit+0x3c4/0x510
[  747.730623]  [<ffffffff8549dca5>] ? console_unlock+0x265/0x4b0
[  747.730626]  [<ffffffff8549e669>] vprintk_default+0x29/0x40
[  747.730631]  [<ffffffff85b80448>] printk+0x60/0x77
[  747.730636]  [<ffffffff8551f843>] print_modules+0xa3/0xd0
[  747.730640]  [<ffffffff85b90000>] ? __lock_text_end+0xe21/0xe21
[  747.730642]  [<ffffffff85b91867>] __die+0x97/0xe0
[  747.730646]  [<ffffffff85430a68>] die+0x38/0x70
[  747.730647]  [<ffffffff85b91092>] do_general_protection+0xa2/0x1f0
[  747.730649]  [<ffffffff85b90718>] general_protection+0x28/0x30
[  747.730652]  [<ffffffff854f78c0>] ? cpuacct_charge+0x20/0x50
[  747.730655]  [<ffffffff854e497c>] update_curr+0x14c/0x1e0
[  747.730656]  [<ffffffff854e4d78>] dequeue_entity+0x28/0x5c0
[  747.730661]  [<ffffffff856643f0>] ? __pollwait+0xf0/0xf0
[  747.730662]  [<ffffffff854e5363>] dequeue_task_fair+0x53/0x660
[  747.730666]  [<ffffffff854de455>] ? sched_clock_cpu+0x85/0xc0
[  747.730668]  [<ffffffff854d7376>] deactivate_task+0x46/0xd0
[  747.730672]  [<ffffffff85b8c2b5>] __schedule+0x585/0x680
[  747.730674]  [<ffffffff85b8c3d9>] schedule+0x29/0x70
[  747.730679]  [<ffffffff85a3d56e>] __lock_sock+0x7e/0xc0
[  747.730684]  [<ffffffff854c70a0>] ? wake_up_atomic_t+0x30/0x30
[  747.730686]  [<ffffffff85a3dec1>] lock_sock_fast+0x31/0x60
[  747.730690]  [<ffffffff85ab2941>] tcp_ioctl+0x101/0x1d0
[  747.730695]  [<ffffffff85b1cbb5>] inet6_ioctl+0xa5/0xb0
[  747.730739]  [<ffffffffc107bfd6>] kmsg_sys_rcv+0x66/0x1e0 [vxio]
[  747.730788]  [<ffffffffc13042de>] ? vol_rp_process_ack+0x46e/0xcf0 [vxio]
[  747.730833]  [<ffffffffc12e9993>] nmcom_get_next_mblk+0x93/0x170 [vxio]
[  747.730877]  [<ffffffffc12e4ec0>] nmcom_get_data_msg+0x500/0x840 [vxio]
[  747.730921]  [<ffffffffc12e52a7>] nmcom_get_next_msg+0xa7/0x100 [vxio]
[  747.730964]  [<ffffffffc12e5393>] nmcom_wait_msg_tcp+0x93/0x180 [vxio]
[  747.731009]  [<ffffffffc12f82eb>] nmcom_server_proc_tcp+0x6b/0xf0 [vxio]
[  747.731053]  [<ffffffffc12f9ba2>] nmcom_server_main_tcp+0x1832/0x1990 [vxio]
[  747.731057]  [<ffffffff855be400>] ? copy_page_from_iter+0x130/0x150
[  747.731060]  [<ffffffff8551250c>] ? get_futex_key+0x19c/0x2c0
[  747.731062]  [<ffffffff85793f21>] ? vsnprintf+0x441/0x6a0
[  747.731064]  [<ffffffff855127c0>] ? futex_wake+0x90/0x180
[  747.731066]  [<ffffffff854e497c>] ? update_curr+0x14c/0x1e0
[  747.731067]  [<ffffffff854e497c>] ? update_curr+0x14c/0x1e0
[  747.731069]  [<ffffffff854e10ae>] ? account_entity_dequeue+0xae/0xd0
[  747.731072]  [<ffffffff85b8c050>] ? __schedule+0x320/0x680
[  747.731116]  [<ffffffffc12f8370>] ? nmcom_server_proc_tcp+0xf0/0xf0 [vxio]
[  747.731119]  [<ffffffff854c5fb1>] kthread+0xd1/0xe0
[  747.731121]  [<ffffffff854c5ee0>] ? insert_kthread_work+0x40/0x40
[  747.731124]  [<ffffffff85b99df7>] ret_from_fork_nospec_begin+0x21/0x21
[  747.731125]  [<ffffffff854c5ee0>] ? insert_kthread_work+0x40/0x40
        ...

PID: 27521    TASK: ffff9aa97a1fd280  CPU: 5    COMMAND: "vxnetd"
 #0 [ffff9aa97dd76ed8] machine_kexec at ffffffff854662f4
 #1 [ffff9aa97dd76f38] __crash_kexec at ffffffff85522b82
 #2 [ffff9aa97dd77008] crash_kexec at ffffffff85522c70
 #3 [ffff9aa97dd77020] oops_end at ffffffff85b91798
 #4 [ffff9aa97dd77048] die at ffffffff85430a7b
 #5 [ffff9aa97dd77078] do_general_protection at ffffffff85b91092
 #6 [ffff9aa97dd770b0] general_protection at ffffffff85b90718
    [exception RIP: fb_get_buffer_offset+122] <<---------- The 2nd GPF
    RIP: ffffffff857fb8ba  RSP: ffff9aa97dd77160  RFLAGS: 00010046
    RAX: 60925c0260925c02  RBX: 60925c0260925c02  RCX: 0000000060925c02
    RDX: 0000000000000020  RSI: ffff9a2d35cf1200  RDI: ffff9a2d35cf1000
    RBP: ffff9aa97dd77180   R8: 000000008124a002   R9: 0000000000000002
    R10: 0000000000000000  R11: ffff9aa97334c210  R12: 0000000000000020
    R13: 0000000000000000  R14: ffff9aa97a1a0c00  R15: 0000000000000010
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #7 [ffff9aa97dd77188] soft_cursor at ffffffff8580c4d8
 #8 [ffff9aa97dd771d8] bit_cursor at ffffffff8580bcd3
 #9 [ffff9aa97dd772a8] fbcon_cursor at ffffffff85807fcd
#10 [ffff9aa97dd772f8] hide_cursor at ffffffff8587e883
#11 [ffff9aa97dd77310] vt_console_print at ffffffff85880308
#12 [ffff9aa97dd77378] call_console_drivers.constprop.19 at ffffffff8549c6a3
#13 [ffff9aa97dd773a0] console_unlock at ffffffff8549dd7b
#14 [ffff9aa97dd773e0] vprintk_emit at ffffffff8549e2b4
#15 [ffff9aa97dd77450] vprintk_default at ffffffff8549e669
#16 [ffff9aa97dd77460] printk at ffffffff85b80448
#17 [ffff9aa97dd774c0] print_modules at ffffffff8551f843
#18 [ffff9aa97dd77510] __die at ffffffff85b91867
#19 [ffff9aa97dd77538] die at ffffffff85430a68
#20 [ffff9aa97dd77568] do_general_protection at ffffffff85b91092
#21 [ffff9aa97dd775a0] general_protection at ffffffff85b90718
    [exception RIP: cpuacct_charge+32] <<---------- The 1st GPF
    RIP: ffffffff854f78c0  RSP: ffff9aa97dd77650  RFLAGS: 00010002
    RAX: 60925c0260925c02  RBX: ffff9aa97a1fd2e8  RCX: 0000000000000005
    RDX: ffffffff8605d220  RSI: 00000000000869b4  RDI: ffff9aa97a1fd280
    RBP: ffff9aa97dd77650   R8: ffff9aa97dd74000   R9: 0000000000000000
    R10: ffff9a2cffc03a00  R11: ffff9aa8a1a1de40  R12: 00000000000869b4
    R13: ffff9aa97ed5ad40  R14: ffff9aa97a1fd280  R15: 0000000000000001
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#22 [ffff9aa97dd77658] update_curr at ffffffff854e497c
#23 [ffff9aa97dd77698] dequeue_entity at ffffffff854e4d78
#24 [ffff9aa97dd776e8] dequeue_task_fair at ffffffff854e5363
#25 [ffff9aa97dd77738] deactivate_task at ffffffff854d7376
#26 [ffff9aa97dd77760] __schedule at ffffffff85b8c2b5
#27 [ffff9aa97dd777c0] schedule at ffffffff85b8c3d9
#28 [ffff9aa97dd777d0] __lock_sock at ffffffff85a3d56e
#29 [ffff9aa97dd77828] lock_sock_fast at ffffffff85a3dec1
#30 [ffff9aa97dd77848] tcp_ioctl at ffffffff85ab2941
#31 [ffff9aa97dd77870] inet6_ioctl at ffffffff85b1cbb5
#32 [ffff9aa97dd77880] kmsg_sys_rcv at ffffffffc107bfd6 [vxio]
#33 [ffff9aa97dd77918] nmcom_get_next_mblk at ffffffffc12e9993 [vxio]
#34 [ffff9aa97dd77960] nmcom_get_data_msg at ffffffffc12e4ec0 [vxio]
#35 [ffff9aa97dd77a28] nmcom_get_next_msg at ffffffffc12e52a7 [vxio]
#36 [ffff9aa97dd77a88] nmcom_wait_msg_tcp at ffffffffc12e5393 [vxio]
#37 [ffff9aa97dd77ae0] nmcom_server_proc_tcp at ffffffffc12f82eb [vxio]
#38 [ffff9aa97dd77b80] nmcom_server_main_tcp at ffffffffc12f9ba2 [vxio]
#39 [ffff9aa97dd77ec8] kthread at ffffffff854c5fb1