rdma-core ドライバーによるページ割り当ての失敗と、無効なメモリーアクセスによるカーネルパニック

Issue

• 次のページ割り当てエラーが発生し、ページ割り当てが失敗した 1 分後にカーネルパニックが発生し、BUG: unable to handle kernel paging request at XXXXX のようなメッセージが表示されます。

[7277049.611176] (fprintd): page allocation failure: order:7, mode:0x60c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0
[7277049.611182] CPU: 5 PID: 2113771 Comm: (fprintd) Kdump: loaded Not tainted 4.18.0-348.12.2.el8_5.x86_64 #1
[7277049.611183] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 11/24/2021
[7277049.611184] Call Trace:
[7277049.611191]  dump_stack+0x5c/0x80
[7277049.611196]  warn_alloc.cold.114+0x7b/0x10d
[7277049.611201]  ? _cond_resched+0x15/0x30
[7277049.611202]  ? __alloc_pages_direct_compact+0x157/0x160
[7277049.611204]  __alloc_pages_slowpath+0xc87/0xcd0
[7277049.611208]  ? security_kernfs_init_security+0x2a/0x40
[7277049.611210]  __alloc_pages_nodemask+0x2db/0x310
[7277049.611213]  kmalloc_order+0x28/0x90
[7277049.611214]  kmalloc_order_trace+0x1d/0xa0
[7277049.611218]  __kmalloc+0x1ee/0x240
[7277049.611222]  ? sysfs_add_file_mode_ns+0x82/0x170
[7277049.611237]  ? ib_port_register_module_stat+0xb0/0xb0 [ib_core]
[7277049.611245]  alloc_group_attrs+0x40/0x120 [ib_core]
[7277049.611254]  ib_setup_port_attrs+0x561/0x690 [ib_core]
[7277049.611263]  add_one_compat_dev.part.22+0x1a7/0x220 [ib_core]
[7277049.611272]  rdma_dev_init_net+0xf5/0x1a0 [ib_core]
[7277049.611275]  ops_init+0x3a/0x100
[7277049.611277]  setup_net+0xee/0x250
[7277049.611279]  copy_net_ns+0xc3/0x180
[7277049.611283]  create_new_namespaces+0x170/0x210
[7277049.611285]  unshare_nsproxy_namespaces+0x55/0xa0
[7277049.611287]  ksys_unshare+0x18f/0x350
[7277049.611288]  __x64_sys_unshare+0xe/0x20
[7277049.611291]  do_syscall_64+0x5b/0x1a0
[7277049.611293]  entry_SYSCALL_64_after_hwframe+0x65/0xca