on an AC68U Merlin 380.63_2. router has been running 9 days without reboot, when suddenly connectivity was very slow. I managed with difficulty to get to the router UI, it showed a sudden sharp jump in memory usage. Navigating the UI was very slow though so I couldn't see much. I did manage to get the syslog, it had the below repeatedly. Unforunately this block was repeated enough times that there wasn't anything preceding this to give a clue what triggered it. Any ideas? Of course, everything was fine after restarting the router.
Code:
Nov 24 10:56:58 kernel: Mem-info:
Nov 24 10:56:58 kernel: DMA per-cpu:
Nov 24 10:56:58 kernel: CPU 0: hi: 42, btch: 7 usd: 40
Nov 24 10:56:58 kernel: CPU 1: hi: 42, btch: 7 usd: 41
Nov 24 10:56:58 kernel: Normal per-cpu:
Nov 24 10:56:58 kernel: CPU 0: hi: 42, btch: 7 usd: 12
Nov 24 10:56:58 kernel: CPU 1: hi: 42, btch: 7 usd: 38
Nov 24 10:56:58 kernel: active_anon:1427 inactive_anon:1687 isolated_anon:0
Nov 24 10:56:58 kernel: active_file:1246 inactive_file:2004 isolated_file:0
Nov 24 10:56:58 kernel: unevictable:0 dirty:0 writeback:0 unstable:0
Nov 24 10:56:58 kernel: free:19788 slab_reclaimable:241 slab_unreclaimable:33826
Nov 24 10:56:58 kernel: mapped:842 shmem:185 pagetables:128 bounce:0
Nov 24 10:56:58 kernel: DMA free:4132kB min:11020kB low:13772kB high:16528kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:130048kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:122592kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Nov 24 10:56:58 kernel: lowmem_reserve[]: 0 109 109
Nov 24 10:56:58 kernel: Normal free:75020kB min:9456kB low:11820kB high:14184kB active_anon:5708kB inactive_anon:6748kB active_file:4984kB inactive_file:8016kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:111616kB mlocked:0kB dirty:0kB writeback:0kB mapped:3368kB shmem:740kB slab_reclaimable:964kB slab_unreclaimable:12712kB kernel_stack:496kB pagetables:512kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Nov 24 10:56:58 kernel: lowmem_reserve[]: 0 0 0
Nov 24 10:56:58 kernel: DMA: 1*4kB 2*8kB 1*16kB 2*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 4132kB
Nov 24 10:56:58 kernel: Normal: 243*4kB 198*8kB 105*16kB 80*32kB 64*64kB 5*128kB 2*256kB 1*512kB 1*1024kB 2*2048kB 14*4096kB = 75020kB
Nov 24 10:56:58 kernel: 3435 total pagecache pages
Nov 24 10:56:58 kernel: 0 pages in swap cache
Nov 24 10:56:58 kernel: Swap cache stats: add 0, delete 0, find 0/0
Nov 24 10:56:58 kernel: Free swap = 0kB
Nov 24 10:56:58 kernel: Total swap = 0kB
Nov 24 10:56:58 kernel: 65536 pages of RAM
Nov 24 10:56:58 kernel: 20086 free pages
Nov 24 10:56:58 kernel: 1611 reserved pages
Nov 24 10:56:58 kernel: 6712 slab pages
Nov 24 10:56:58 kernel: 6014 pages shared
Nov 24 10:56:58 kernel: 0 pages swap cached
Nov 24 10:56:58 kernel: SLUB: Unable to allocate memory on node -1 (gfp=0x21)
Nov 24 10:56:58 kernel: cache: kmalloc_dma-4096, object size: 4096, buffer size: 4096, default order: 3, min order: 0
Nov 24 10:56:58 kernel: node 0: slabs: 3828, objs: 30624, free: 0
Nov 24 10:56:58 kernel: swapper: page allocation failure. order:0, mode:0x4021
Nov 24 10:56:58 kernel: [<c0043ff8>] (unwind_backtrace+0x0/0xf8) from [<c009e84c>] (__alloc_pages_nodemask+0x61c/0x698)
Nov 24 10:56:58 kernel: [<c009e84c>] (__alloc_pages_nodemask+0x61c/0x698) from [<c0377444>] (__slab_alloc+0x794/0x814)
Nov 24 10:56:58 kernel: [<c0377444>] (__slab_alloc+0x794/0x814) from [<c0377678>] (__kmalloc_track_caller+0xf8/0x108)
Nov 24 10:56:58 kernel: [<c0377678>] (__kmalloc_track_caller+0xf8/0x108) from [<c0379c68>] (__alloc_skb+0x54/0x104)
Nov 24 10:56:58 kernel: [<c0379c68>] (__alloc_skb+0x54/0x104) from [<c01d8ea4>] (osl_alloc_skb+0x18/0x30)
Nov 24 10:56:58 kernel: [<c01d8ea4>] (osl_alloc_skb+0x18/0x30) from [<c0388eb0>] (osl_pktget+0x4c/0x154)
Nov 24 10:56:58 kernel: [<c0388eb0>] (osl_pktget+0x4c/0x154) from [<c038842c>] (_dma_rxfill+0x174/0x3d4)
Nov 24 10:56:58 kernel: [<c038842c>] (_dma_rxfill+0x174/0x3d4) from [<bf908344>] (wlc_bmac_recv+0x394/0x398 [wl])
Nov 24 10:56:58 kernel: unwind: Index not found bf908344
