Hi Igor,

Setting vm.max_map_count to 20x the normal value did not help

The issue happens on a group of servers and among the group, it shows up
only in servers which have ~10k server{} blocks

On servers that have lower number of server{} blocks , the ENOMEM issue is
not there

Also, I can find that the RAM usage of the Nginx process is directly
proportional to the number of server {} blocks

For example on a server having the problem

# ps_mem| head -1 && ps_mem |grep nginx
Private + Shared = RAM used Program
1.0 GiB + 2.8 GiB = 3.8 GiB nginx (3)


That is for a single worker process with 4 threads in thread_pool
# pstree|grep nginx
|-nginx-+-nginx---4*[{nginx}]
| `-nginx

Whatever config change I try the memory usage seem to mostly depend on the
number of server contexts defined

Now the issue mostly happen in nginx reload ,when one more worker process
will be active in shutting down mode

I believe the memalign error is thrown by the worker being shutdown, this
is because the sites work after the error and also the pid mentioned in the
error would have gone when I check ps


# pmap 948965|grep 16K
00007f2923ff2000 16K r-x-- ngx_http_redis2_module.so
00007f2924fd7000 16K r---- libc-2.17.so
00007f2925431000 16K rw--- [ anon ]
00007f292584a000 16K rw--- [ anon ]

Aug 4 05:50:00 b kernel: SysRq : Show Memory
Aug 4 05:50:00 b kernel: Mem-Info:
Aug 4 05:50:00 b kernel: active_anon:7757394 inactive_anon:1021319
isolated_anon:0#012 active_file:3733324 inactive_file:2136476
isolated_file:0#012 unevictable:0 dirty:1766 writeback:6 wbtmp:0
unstable:0#012 slab_reclaimable:2003687 slab_unreclaimable:901391#012
mapped:316734 shmem:2381810 pagetables:63163 bounce:0#012 free:4851283
free_pcp:11332 free_cma:0
Aug 4 05:50:00 bravo kernel: Node 0 DMA free:15888kB min:8kB low:8kB
high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB
inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB
present:15972kB managed:15888kB mlocked:0kB dirty:0kB writeback:0kB
mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB
kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB
local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0
all_unreclaimable? yes
Aug 4 05:50:00 b kernel: lowmem_reserve[]: 0 1679 64139 64139

# cat /proc/buddyinfo
Node 0, zone DMA 0 0 1 0 2 1 1
0 1 1 3
Node 0, zone DMA32 5284 6753 6677 1083 410 59 1
0 0 0 0
Node 0, zone Normal 500327 638958 406737 14690 872 106 11
0 0 0 0
Node 1, zone Normal 584840 291640 188 0 0 0 0
0 0 0 0


The only correlation I see in having the error is the number of server {}
blocks (close to 10k) which then makes the nginx process consume ~ 4GB of
mem with a single worker process and then a reload is done




On Thu, Aug 2, 2018 at 6:02 PM Igor A. Ippolitov <iippolitov@nginx.com>
wrote:

> Anoop,
>
> There are two guesses: either mmap allocations limit is hit or memory is
> way too fragmented.
> Could you please track amount of mapped regions for a worker with pmap and
> amount of 16k areas in Normal zones (it is the third number)?
>
> You can also set vm.max_map_count to a higher number (like 20 times higher
> than default) and look if the error is gone.
>
> Please, let me know if increasing vm.max_map_count helps you.
>
> On 02.08.2018 13:06, Anoop Alias wrote:
>
> Hi Igor,
>
> The error happens randomly
>
> 2018/08/02 06:52:42 [emerg] 874514#874514: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
> 2018/08/02 09:42:53 [emerg] 872996#872996: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
> 2018/08/02 10:16:14 [emerg] 877611#877611: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
> 2018/08/02 10:16:48 [emerg] 879410#879410: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
> 2018/08/02 10:17:55 [emerg] 876563#876563: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
> 2018/08/02 10:20:21 [emerg] 879263#879263: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
> 2018/08/02 10:20:51 [emerg] 878991#878991: posix_memalign(16, 16384)
> failed (12: Cannot allocate memory)
>
> # date
> Thu Aug 2 10:58:48 BST 2018
>
> ------------------------------------------
> # cat /proc/buddyinfo
> Node 0, zone DMA 0 0 1 0 2 1 1
> 0 1 1 3
> Node 0, zone DMA32 11722 11057 4663 1647 609 72 10
> 7 1 0 0
> Node 0, zone Normal 755026 710760 398136 21462 1114 18 1
> 0 0 0 0
> Node 1, zone Normal 341295 801810 179604 256 0 0 0
> 0 0 0 0
> -----------------------------------------
>
>
> slabinfo - version: 2.1
> # name <active_objs> <num_objs> <objsize> <objperslab>
> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata
> <active_slabs> <num_slabs> <sharedavail>
> SCTPv6 21 21 1536 21 8 : tunables 0 0 0
> : slabdata 1 1 0
> SCTP 0 0 1408 23 8 : tunables 0 0 0
> : slabdata 0 0 0
> kcopyd_job 0 0 3312 9 8 : tunables 0 0 0
> : slabdata 0 0 0
> dm_uevent 0 0 2608 12 8 : tunables 0 0 0
> : slabdata 0 0 0
> nf_conntrack_ffffffff81acbb00 14054 14892 320 51 4 : tunables
> 0 0 0 : slabdata 292 292 0
> lvp_cache 36 36 224 36 2 : tunables 0 0 0
> : slabdata 1 1 0
> lve_struct 4140 4140 352 46 4 : tunables 0 0 0
> : slabdata 90 90 0
> fat_inode_cache 0 0 744 44 8 : tunables 0 0 0
> : slabdata 0 0 0
> fat_cache 0 0 40 102 1 : tunables 0 0 0
> : slabdata 0 0 0
> isofs_inode_cache 0 0 664 49 8 : tunables 0 0 0
> : slabdata 0 0 0
> ext4_inode_cache 30 30 1088 30 8 : tunables 0 0 0
> : slabdata 1 1 0
> ext4_xattr 0 0 88 46 1 : tunables 0 0 0
> : slabdata 0 0 0
> ext4_free_data 0 0 64 64 1 : tunables 0 0 0
> : slabdata 0 0 0
> ext4_allocation_context 32 32 128 32 1 : tunables 0
> 0 0 : slabdata 1 1 0
> ext4_io_end 0 0 72 56 1 : tunables 0 0 0
> : slabdata 0 0 0
> ext4_extent_status 102 102 40 102 1 : tunables 0 0
> 0 : slabdata 1 1 0
> jbd2_journal_handle 0 0 48 85 1 : tunables 0 0
> 0 : slabdata 0 0 0
> jbd2_journal_head 0 0 112 36 1 : tunables 0 0 0
> : slabdata 0 0 0
> jbd2_revoke_table_s 256 256 16 256 1 : tunables 0 0
> 0 : slabdata 1 1 0
> jbd2_revoke_record_s 0 0 32 128 1 : tunables 0 0
> 0 : slabdata 0 0 0
> kvm_async_pf 0 0 136 30 1 : tunables 0 0 0
> : slabdata 0 0 0
> kvm_vcpu 0 0 18560 1 8 : tunables 0 0 0
> : slabdata 0 0 0
> xfs_dqtrx 992 992 528 31 4 : tunables 0 0 0
> : slabdata 32 32 0
> xfs_dquot 3264 3264 472 34 4 : tunables 0 0 0
> : slabdata 96 96 0
> xfs_ili 4342175 4774399 152 53 2 : tunables 0 0
> 0 : slabdata 90083 90083 0
> xfs_inode 4915588 5486076 1088 30 8 : tunables 0 0
> 0 : slabdata 182871 182871 0
> xfs_efd_item 2680 2760 400 40 4 : tunables 0 0 0
> : slabdata 69 69 0
> xfs_da_state 1088 1088 480 34 4 : tunables 0 0 0
> : slabdata 32 32 0
> xfs_btree_cur 1248 1248 208 39 2 : tunables 0 0 0
> : slabdata 32 32 0
> xfs_log_ticket 14874 15048 184 44 2 : tunables 0 0 0
> : slabdata 342 342 0
> xfs_ioend 12909 13104 104 39 1 : tunables 0 0 0
> : slabdata 336 336 0
> scsi_cmd_cache 5400 5652 448 36 4 : tunables 0 0 0
> : slabdata 157 157 0
> ve_struct 0 0 848 38 8 : tunables 0 0 0
> : slabdata 0 0 0
> ip6_dst_cache 1152 1152 448 36 4 : tunables 0 0 0
> : slabdata 32 32 0
> RAWv6 910 910 1216 26 8 : tunables 0 0 0
> : slabdata 35 35 0
> UDPLITEv6 0 0 1216 26 8 : tunables 0 0 0
> : slabdata 0 0 0
> UDPv6 832 832 1216 26 8 : tunables 0 0 0
> : slabdata 32 32 0
> tw_sock_TCPv6 1152 1376 256 32 2 : tunables 0 0 0
> : slabdata 43 43 0
> TCPv6 510 510 2176 15 8 : tunables 0 0 0
> : slabdata 34 34 0
> cfq_queue 3698 5145 232 35 2 : tunables 0 0 0
> : slabdata 147 147 0
> bsg_cmd 0 0 312 52 4 : tunables 0 0 0
> : slabdata 0 0 0
> mqueue_inode_cache 136 136 960 34 8 : tunables 0 0
> 0 : slabdata 4 4 0
> hugetlbfs_inode_cache 1632 1632 632 51 8 : tunables 0 0
> 0 : slabdata 32 32 0
> configfs_dir_cache 1472 1472 88 46 1 : tunables 0 0
> 0 : slabdata 32 32 0
> dquot 0 0 256 32 2 : tunables 0 0 0
> : slabdata 0 0 0
> userfaultfd_ctx_cache 32 32 128 32 1 : tunables 0 0
> 0 : slabdata 1 1 0
> fanotify_event_info 2336 2336 56 73 1 : tunables 0 0
> 0 : slabdata 32 32 0
> dio 6171 6222 640 51 8 : tunables 0 0 0
> : slabdata 122 122 0
> pid_namespace 42 42 2192 14 8 : tunables 0 0 0
> : slabdata 3 3 0
> posix_timers_cache 1056 1056 248 33 2 : tunables 0 0
> 0 : slabdata 32 32 0
> UDP-Lite 0 0 1088 30 8 : tunables 0 0 0
> : slabdata 0 0 0
> flow_cache 2268 2296 144 28 1 : tunables 0 0 0
> : slabdata 82 82 0
> xfrm_dst_cache 896 896 576 28 4 : tunables 0 0 0
> : slabdata 32 32 0
> ip_fib_alias 2720 2720 48 85 1 : tunables 0 0 0
> : slabdata 32 32 0
> RAW 3977 4224 1024 32 8 : tunables 0 0 0
> : slabdata 132 132 0
> UDP 4110 4110 1088 30 8 : tunables 0 0 0
> : slabdata 137 137 0
> tw_sock_TCP 4756 5216 256 32 2 : tunables 0 0 0
> : slabdata 163 163 0
> TCP 2705 2768 1984 16 8 : tunables 0 0 0
> : slabdata 173 173 0
> scsi_data_buffer 5440 5440 24 170 1 : tunables 0 0 0
> : slabdata 32 32 0
> blkdev_queue 154 154 2208 14 8 : tunables 0 0 0
> : slabdata 11 11 0
> blkdev_requests 4397688 4405884 384 42 4 : tunables 0 0
> 0 : slabdata 104902 104902 0
> blkdev_ioc 11232 11232 112 36 1 : tunables 0 0 0
> : slabdata 312 312 0
> user_namespace 0 0 1304 25 8 : tunables 0 0 0
> : slabdata 0 0 0
> sock_inode_cache 12282 12282 704 46 8 : tunables 0 0 0
> : slabdata 267 267 0
> file_lock_cache 20056 20960 200 40 2 : tunables 0 0 0
> : slabdata 524 524 0
> net_namespace 6 6 5056 6 8 : tunables 0 0 0
> : slabdata 1 1 0
> shmem_inode_cache 16970 18952 712 46 8 : tunables 0 0 0
> : slabdata 412 412 0
> Acpi-ParseExt 39491 40432 72 56 1 : tunables 0 0 0
> : slabdata 722 722 0
> Acpi-State 1683 1683 80 51 1 : tunables 0 0 0
> : slabdata 33 33 0
> Acpi-Namespace 11424 11424 40 102 1 : tunables 0 0 0
> : slabdata 112 112 0
> task_delay_info 15336 15336 112 36 1 : tunables 0 0 0
> : slabdata 426 426 0
> taskstats 1568 1568 328 49 4 : tunables 0 0 0
> : slabdata 32 32 0
> proc_inode_cache 169897 190608 680 48 8 : tunables 0 0 0
> : slabdata 3971 3971 0
> sigqueue 2208 2208 168 48 2 : tunables 0 0 0
> : slabdata 46 46 0
> bdev_cache 792 792 896 36 8 : tunables 0 0 0
> : slabdata 22 22 0
> sysfs_dir_cache 74698 74698 120 34 1 : tunables 0 0 0
> : slabdata 2197 2197 0
> mnt_cache 163197 163424 256 32 2 : tunables 0 0 0
> : slabdata 5107 5107 0
> filp 64607 97257 320 51 4 : tunables 0 0 0
> : slabdata 1907 1907 0
> inode_cache 370744 370947 616 53 8 : tunables 0 0 0
> : slabdata 6999 6999 0
> dentry 1316262 2139228 192 42 2 : tunables 0 0
> 0 : slabdata 50934 50934 0
> iint_cache 0 0 80 51 1 : tunables 0 0 0
> : slabdata 0 0 0
> buffer_head 1441470 2890290 104 39 1 : tunables 0 0
> 0 : slabdata 74110 74110 0
> vm_area_struct 194998 196840 216 37 2 : tunables 0 0 0
> : slabdata 5320 5320 0
> mm_struct 2679 2760 1600 20 8 : tunables 0 0 0
> : slabdata 138 138 0
> files_cache 8680 8925 640 51 8 : tunables 0 0 0
> : slabdata 175 175 0
> signal_cache 3691 3780 1152 28 8 : tunables 0 0 0
> : slabdata 135 135 0
> sighand_cache 1950 2160 2112 15 8 : tunables 0 0 0
> : slabdata 144 144 0
> task_xstate 8070 8658 832 39 8 : tunables 0 0 0
> : slabdata 222 222 0
> task_struct 1913 2088 4080 8 8 : tunables 0 0 0
> : slabdata 261 261 0
> cred_jar 31699 33936 192 42 2 : tunables 0 0 0
> : slabdata 808 808 0
> anon_vma_chain 164026 168704 64 64 1 : tunables 0 0 0
> : slabdata 2636 2636 0
> anon_vma 84104 84594 88 46 1 : tunables 0 0 0
> : slabdata 1839 1839 0
> pid 11127 12576 128 32 1 : tunables 0 0 0
> : slabdata 393 393 0
> shared_policy_node 9350 9350 48 85 1 : tunables 0 0
> 0 : slabdata 110 110 0
> numa_policy 62 62 264 31 2 : tunables 0 0 0
> : slabdata 2 2 0
> radix_tree_node 771778 1194312 584 28 4 : tunables 0 0
> 0 : slabdata 42654 42654 0
> idr_layer_cache 2538 2565 2112 15 8 : tunables 0 0 0
> : slabdata 171 171 0
> dma-kmalloc-8192 0 0 8192 4 8 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-4096 0 0 4096 8 8 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-2048 0 0 2048 16 8 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-1024 0 0 1024 32 8 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-512 0 0 512 32 4 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-256 0 0 256 32 2 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-128 0 0 128 32 1 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-64 0 0 64 64 1 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-32 0 0 32 128 1 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-16 0 0 16 256 1 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-8 0 0 8 512 1 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-192 0 0 192 42 2 : tunables 0 0 0
> : slabdata 0 0 0
> dma-kmalloc-96 0 0 96 42 1 : tunables 0 0 0
> : slabdata 0 0 0
> kmalloc-8192 385 388 8192 4 8 : tunables 0 0 0
> : slabdata 97 97 0
> kmalloc-4096 9296 10088 4096 8 8 : tunables 0 0 0
> : slabdata 1261 1261 0
> kmalloc-2048 65061 133536 2048 16 8 : tunables 0 0 0
> : slabdata 8346 8346 0
> kmalloc-1024 11987 21120 1024 32 8 : tunables 0 0 0
> : slabdata 660 660 0
> kmalloc-512 107510 187072 512 32 4 : tunables 0 0 0
> : slabdata 5846 5846 0
> kmalloc-256 160498 199104 256 32 2 : tunables 0 0 0
> : slabdata 6222 6222 0
> kmalloc-192 144975 237426 192 42 2 : tunables 0 0 0
> : slabdata 5653 5653 0
> kmalloc-128 36799 108096 128 32 1 : tunables 0 0 0
> : slabdata 3378 3378 0
> kmalloc-96 99510 238896 96 42 1 : tunables 0 0 0
> : slabdata 5688 5688 0
> kmalloc-64 7978152 8593280 64 64 1 : tunables 0 0
> 0 : slabdata 134270 134270 0
> kmalloc-32 2939882 3089664 32 128 1 : tunables 0 0
> 0 : slabdata 24138 24138 0
> kmalloc-16 172057 172288 16 256 1 : tunables 0 0 0
> : slabdata 673 673 0
> kmalloc-8 109568 109568 8 512 1 : tunables 0 0 0
> : slabdata 214 214 0
> kmem_cache_node 893 896 64 64 1 : tunables 0 0 0
> : slabdata 14 14 0
> kmem_cache 612 612 320 51 4 : tunables 0 0 0
> : slabdata 12 12 0
>
> -------------------------------------------------
>
>
> # uname -r
> 3.10.0-714.10.2.lve1.5.17.1.el7.x86_64
>
> --------------------------------------------------------
>
> Core part of glances
> http://i.imgur.com/La5JbQn.png
> -----------------------------------------------------------
>
> Thank you very much for looking into this
>
>
> On Thu, Aug 2, 2018 at 12:37 PM Igor A. Ippolitov <iippolitov@nginx.com>
> wrote:
>
>> Anoop,
>>
>> I doubt this will be the solution, but may we have a look at
>> /proc/buddyinfo and /proc/slabinfo the moment when nginx can't allocate
>> memory?
>>
>> On 02.08.2018 08:15, Anoop Alias wrote:
>>
>> Hi Maxim,
>>
>> I enabled debug and the memalign call is happening on nginx reloads and
>> the ENOMEM happen sometimes on the reload(not on all reloads)
>>
>> 2018/08/02 05:59:08 [notice] 872052#872052: signal process started
>> 2018/08/02 05:59:23 [notice] 871570#871570: signal 1 (SIGHUP) received
>> from 872052, reconfiguring
>> 2018/08/02 05:59:23 [debug] 871570#871570: wake up, sigio 0
>> 2018/08/02 05:59:23 [notice] 871570#871570: reconfiguring
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 0000000002B0DA00:16384 @16 === > the memalign call on reload
>> 2018/08/02 05:59:23 [debug] 871570#871570: malloc: 00000000087924D0:4560
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 000000000E442E00:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: malloc: 0000000005650850:4096
>> 20
>>
>>
>>
>>
>> 2018/08/02 05:48:49 [debug] 871275#871275: bind() xxxx:443 #71
>> 2018/08/02 05:48:49 [debug] 871275#871275: bind() xxxx:443 #72
>> 2018/08/02 05:48:49 [debug] 871275#871275: bind() xxxx:443 #73
>> 2018/08/02 05:48:49 [debug] 871275#871275: bind() xxxx:443 #74
>> 2018/08/02 05:48:49 [debug] 871275#871275: add cleanup: 000000005340D728
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000024D3260:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000517BAF10:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 0000000053854FC0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 0000000053855FD0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 0000000053856FE0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 0000000053857FF0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: posix_memalign:
>> 0000000053859000:16384 @16
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 000000005385D010:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 000000005385E020:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 000000005385F030:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536CD160:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536CE170:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536CF180:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D0190:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D11A0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D21B0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D31C0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D41D0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D51E0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D61F0:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D7200:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D8210:4096
>> 2018/08/02 05:48:49 [debug] 871275#871275: malloc: 00000000536D9220:4096
>>
>>
>> Infact there are lot of such calls during a reload
>>
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA17ED00:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA1B0FF0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA1E12C0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA211590:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA243880:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA271B30:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA2A3E20:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA2D20D0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA3063E0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA334690:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA366980:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA396C50:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA3C8F40:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA3F9210:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA4294E0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA45B7D0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA489A80:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA4BBD70:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA4EA020:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA51E330:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA54C5E0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA57E8D0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA5AEBA0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA5DEE70:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA611160:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA641430:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA671700:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA6A29E0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA6D5CE0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA707FD0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA736280:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA768570:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA796820:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA7CAB30:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA7F8DE0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA82B0D0:16384 @16
>> 2018/08/02 05:59:23 [debug] 871570#871570: posix_memalign:
>> 00000000BA85B3A0:16384 @16
>>
>>
>>
>> What is perplexing is that the system has enough free (available RAM)
>> #############
>> # free -g
>> total used free shared buff/cache
>> available
>> Mem: 125 54 24 8 46
>> 58
>> Swap: 0 0 0
>> #############
>>
>> # ulimit -a
>> core file size (blocks, -c) 0
>> data seg size (kbytes, -d) unlimited
>> scheduling priority (-e) 0
>> file size (blocks, -f) unlimited
>> pending signals (-i) 514579
>> max locked memory (kbytes, -l) 64
>> max memory size (kbytes, -m) unlimited
>> open files (-n) 1024
>> pipe size (512 bytes, -p) 8
>> POSIX message queues (bytes, -q) 819200
>> real-time priority (-r) 0
>> stack size (kbytes, -s) 8192
>> cpu time (seconds, -t) unlimited
>> max user processes (-u) 514579
>> virtual memory (kbytes, -v) unlimited
>> file locks (-x) unlimited
>>
>> #########################################
>>
>> There is no other thing limiting memory allocation
>>
>> Any way to prevent this or probably identify/prevent this
>>
>>
>> On Tue, Jul 31, 2018 at 7:08 PM Maxim Dounin <mdounin@mdounin.ru> wrote:
>>
>>> Hello!
>>>
>>> On Tue, Jul 31, 2018 at 09:52:29AM +0530, Anoop Alias wrote:
>>>
>>> > I am repeatedly seeing errors like
>>> >
>>> > ######################
>>> > 2018/07/31 03:46:33 [emerg] 2854560#2854560: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 03:54:09 [emerg] 2890190#2890190: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 04:08:36 [emerg] 2939230#2939230: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 04:24:48 [emerg] 2992650#2992650: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 04:42:09 [emerg] 3053092#3053092: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 04:42:17 [emerg] 3053335#3053335: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 04:42:28 [emerg] 3053937#3053937: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > 2018/07/31 04:47:54 [emerg] 3070638#3070638: posix_memalign(16, 16384)
>>> > failed (12: Cannot allocate memory)
>>> > ####################
>>> >
>>> > on a few servers
>>> >
>>> > The servers have enough memory free and the swap usage is 0, yet
>>> somehow
>>> > the kernel denies the posix_memalign with ENOMEM ( this is what I
>>> think is
>>> > happening!)
>>> >
>>> > The numbers requested are always 16, 16k . This makes me suspicious
>>> >
>>> > I have no setting in nginx.conf that reference a 16k
>>> >
>>> > Is there any chance of finding out what requests this and why this is
>>> not
>>> > fulfilled
>>>
>>> There are at least some buffers which default to 16k - for
>>> example, ssl_buffer_size (http://nginx.org/r/ssl_buffer_size).
>>>
>>> You may try debugging log to futher find out where the particular
>>> allocation happens, see here for details:
>>>
>>> http://nginx.org/en/docs/debugging_log.html
>>>
>>> But I don't really think it worth the effort. The error is pretty
>>> clear, and it's better to focus on why these allocations are
>>> denied. Likely you are hitting some limit.
>>>
>>> --
>>> Maxim Dounin
>>> http://mdounin.ru/
>>> _______________________________________________
>>> nginx mailing list
>>> nginx@nginx.org
>>> http://mailman.nginx.org/mailman/listinfo/nginx
>>>
>>
>>
>> --
>> *Anoop P Alias*
>>
>>
>>
>> _______________________________________________
>> nginx mailing listnginx@nginx.orghttp://mailman.nginx.org/mailman/listinfo/nginx
>>
>>
>> _______________________________________________
>> nginx mailing list
>> nginx@nginx.org
>> http://mailman.nginx.org/mailman/listinfo/nginx
>
>
>
> --
> *Anoop P Alias*
>
>
>
> _______________________________________________
> nginx mailing listnginx@nginx.orghttp://mailman.nginx.org/mailman/listinfo/nginx
>
>
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx



--
*Anoop P Alias*
_______________________________________________
nginx mailing list
nginx@nginx.org
http://mailman.nginx.org/mailman/listinfo/nginx