内核由于 double fault 而 panic，error_code:0x0

Issue

• 内核由于 double fault exception 而崩溃
• 服务器自动重启，在以下内核缓冲日志中显示 kernel panic not syncing: Machine halted

[39431632.321369] PANIC: double fault, error_code: 0x0
[39431632.321370] CPU: 0 PID: 3341602 Comm: sshd Kdump: loaded Not tainted 4.18.0-348.12.2.el8_5.x86_64 #1
[39431632.321370] Hardware name: Red Hat RHEV Hypervisor, BIOS 1.11.0-2.el7 04/01/2014
[39431632.321371] RIP: 0010:error_entry+0x11/0x160
[39431632.321372] Code: ff ff 0f 01 f8 e9 a3 f8 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 fc 56 48 8b 74 24 08 48 89 7c 24 08 52 51 50 41 50 <41> 51 41 52 41 53 53 55 41 54 41 55 41 56 41 57 56 31 d2 31
 c9 45
[..]
[39431632.321399] Kernel panic - not syncing: Machine halted.
[39431632.321399] CPU: 0 PID: 3341602 Comm: sshd Kdump: loaded Not tainted 4.18.0-348.12.2.el8_5.x86_64 #1
[39431632.321399] Hardware name: Red Hat RHEV Hypervisor, BIOS 1.11.0-2.el7 04/01/2014
[39431632.321400] Call Trace:
[39431632.321400]  <#DF>
[39431632.321400]  dump_stack+0x5c/0x80
[39431632.321405]  panic+0xe7/0x2a9
[39431632.321406]  df_debug+0x29/0x36
[39431632.321406]  do_double_fault+0xdb/0x160
[39431632.321407]  double_fault+0x1e/0x30
[39431632.321407] RIP: 0010:error_entry+0x11/0x160
[39431632.321409] Code: ff ff 0f 01 f8 e9 a3 f8 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 fc 56 48 8b 74 24 08 48 89 7c 24 08 52 51 50 41 50 <41> 51 41 52 41 53 53 55 41 54 41 55 41 56 41 57 56 31 d2 31
 c9 45
[39431632.321410] RSP: 0018:ffffaaa96bfcf000 EFLAGS: 00010093
[39431632.321411] RAX: 0000000084800b87 RBX: 0000000000000000 RCX: ffffffff84800b87
[39431632.321411] RDX: 0000000000000000 RSI: ffffffff84801108 RDI: ffffaaa96bfcf068
[39431632.321412] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[39431632.321412] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[39431632.321413] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[39431632.321413]  ? native_iret+0x7/0x7
[39431632.321414]  ? page_fault+0x8/0x30
[39431632.321414]  </#DF>
[39431632.321414]  ? native_iret+0x7/0x7
[39431632.321415]  ? __do_page_fault+0x4c0/0x4c0
[39431632.321415]  ? page_fault+0x1e/0x30
[39431632.321415]  ? native_iret+0x7/0x7
[39431632.321416]  ? __do_page_fault+0x4c0/0x4c0