Could anyone explain message issued by mandb

[flavigny]

Hello,
I run ArchlLinux On OlinuxInoMaxi,
I receive on the debug terminal a lot lines (pasted below)
processor was rather inactive, without any heavy load nor huge memory usage.

Is it important?
Something to fix ?

regards
PO.
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[root@alarm ~]# mandb: page allocation failure. order:3, mode:0x4020
[<c0028118>] (unwind_backtrace+0x0/0xe0) from [<c007d3b0>] (__alloc_pages_nodemask+0x504/0x59c)
[<c007d3b0>] (__alloc_pages_nodemask+0x504/0x59c) from [<c009e744>] (slob_new_pages.isra.12+0x10/0x3c)
[<c009e744>] (slob_new_pages.isra.12+0x10/0x3c) from [<c009ecc8>] (__kmalloc_node+0x60/0x94)
[<c009ecc8>] (__kmalloc_node+0x60/0x94) from [<c0229a94>] (__alloc_skb+0x50/0xe4)
[<c0229a94>] (__alloc_skb+0x50/0xe4) from [<c01c6768>] (rx_submit+0x24/0x1f0)
[<c01c6768>] (rx_submit+0x24/0x1f0) from [<c01cd454>] (usb_hcd_giveback_urb+0x94/0xf0)
[<c01cd454>] (usb_hcd_giveback_urb+0x94/0xf0) from [<c01dc5a4>] (ehci_urb_done+0xc4/0xd4)
[<c01dc5a4>] (ehci_urb_done+0xc4/0xd4) from [<c01dcb34>] (qh_completions+0xac/0x494)
[<c01dcb34>] (qh_completions+0xac/0x494) from [<c01e1904>] (ehci_work+0xdc/0x900)
[<c01e1904>] (ehci_work+0xdc/0x900) from [<c01e26f8>] (ehci_irq+0x30c/0x370)
[<c01e26f8>] (ehci_irq+0x30c/0x370) from [<c01cd1f0>] (usb_hcd_irq+0x44/0x88)
[<c01cd1f0>] (usb_hcd_irq+0x44/0x88) from [<c0070f3c>] (handle_IRQ_event+0x24/0xec)
[<c0070f3c>] (handle_IRQ_event+0x24/0xec) from [<c0072a70>] (handle_level_irq+0xd8/0x184)
[<c0072a70>] (handle_level_irq+0xd8/0x184) from [<c0023068>] (asm_do_IRQ+0x68/0x88)
[<c0023068>] (asm_do_IRQ+0x68/0x88) from [<c0023984>] (__irq_svc+0x44/0x8c)
Exception stack(0xc3f17e50 to 0xc3f17e98)
7e40:                                     c3e012ec 00000022 00000480 00000240
7e60: c3e01480 00000022 c3e012ec 00000002 00000038 c39255c0 20000013 001cefc0
7e80: c0298bec c3f17e98 c009f054 c009f058 20000013 ffffffff
[<c0023984>] (__irq_svc+0x44/0x8c) from [<c009f058>] (slob_free+0x2d0/0x310)
[<c009f058>] (slob_free+0x2d0/0x310) from [<c00ff5c4>] (free_rb_tree_fname+0x48/0x88)
[<c00ff5c4>] (free_rb_tree_fname+0x48/0x88) from [<c00ff954>] (ext4_readdir+0x158/0x5ec)
[<c00ff954>] (ext4_readdir+0x158/0x5ec) from [<c00b53e4>] (vfs_readdir+0x7c/0xb4)
[<c00b53e4>] (vfs_readdir+0x7c/0xb4) from [<c00b5524>] (sys_getdents64+0x58/0xb8)
[<c00b5524>] (sys_getdents64+0x58/0xb8) from [<c0023d80>] (ret_fast_syscall+0x0/0x2c)
Mem-info:
DMA per-cpu:
CPU    0: hi:    0, btch:   1 usd:   0
Normal per-cpu:
CPU    0: hi:   18, btch:   3 usd:  11
active_anon:756 inactive_anon:667 isolated_anon:0
active_file:5414 inactive_file:5071 isolated_file:0
unevictable:0 dirty:240 writeback:0 unstable:0
free:873 slab_reclaimable:0 slab_unreclaimable:0
mapped:1017 shmem:23 pagetables:59 bounce:0
DMA free:2252kB min:188kB low:232kB high:280kB active_anon:196kB inactive_anon:60kB active_file:2652kB inactive_file:1272kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:12192kB mlocked:0kB dirty:4kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:4kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 51 51
Normal free:1240kB min:824kB low:1028kB high:1236kB active_anon:2828kB inactive_anon:2608kB active_file:19004kB inactive_file:19012kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:52832kB mlocked:0kB dirty:956kB writeback:0kB mapped:4068kB shmem:92kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:280kB pagetables:232kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 111*4kB 186*8kB 18*16kB 1*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2252kB
Normal: 40*4kB 131*8kB 2*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1240kB
10508 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
16384 pages of RAM
964 free pages
1153 reserved pages
1709 slab pages
5549 pages shared
0 pages swap cached
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