Date: Thu, 28 Sep 2017 15:30:08 -0400 From: Josh Gitlin <jgitlin@goboomtown.com> To: freebsd-net@freebsd.org Subject: Help with mbuf exhaustion Message-ID: <322F6F4B-1153-4ECE-B854-B2981B0CDDF2@goboomtown.com>
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Hi FreeBSD Gurus! We're having an issue with mbuf exhaustion on a FreeBSD server which was = recently upgraded from 10.3-STABLE to 10.3-RELEASE-p2. Under the course = of normal operation, we see mbuf usage steadily increasing until we = reach kern.ipc.nmbufs limit, at which point the machine becomes = unresponsive over the network (due to lack of mbufs for network access) = and the console displays: cxl0: Interface stopped DISTRIBUTING, possible flapping cxl1: Interface stopped DISTRIBUTING, possible flapping [zone: mbuf] kern.ipc.nmbufs limit reached [zone: mbuf] kern.ipc.nmbufs limit reached The machine runs pf and acts as a packet filter, router, gateway and = DHCP/DNS server. It has two Chelsio NICs in it, and is a CARP master = with a secondary. The secondary has identical configuration of hardware = and software and does not exhibit this issue. Given the downtime this causes, we set up our Nagios/Check_MK to graph = the output of `netstat -m` and alert when mbufs in use approaches = `kern.ipc.nmbufs` and we see a steady linear increase in mbuf usage = until we reboot: https://i.stack.imgur.com/8bzAq.png = <https://i.stack.imgur.com/8bzAq.png>; mbuf *clusters* in use does not change when this happens and increasing = mbuf cluster limits has no effect: https://i.stack.imgur.com/7OzdN.png = <https://i.stack.imgur.com/7OzdN.png>; This appears to be a kernel bug of some sort to me, looking for advice = on further troubleshooting or assistance in resolving this! Helpful (maybe) information: netstat -m: 679270/3080/682350 mbufs in use (current/cache/total) 10243/1657/11900/985360 mbuf clusters in use (current/cache/total/max) 10243/1648 mbuf+clusters out of packet secondary zone in use = (current/cache) 8128/482/8610/124025 4k (page size) jumbo clusters in use = (current/cache/total/max) 0/0/0/36748 9k jumbo clusters in use (current/cache/total/max) 128/0/128/20670 16k jumbo clusters in use (current/cache/total/max) 224863K/6012K/230875K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters delayed (4k/9k/16k) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0 requests for sfbufs denied 0 requests for sfbufs delayed 0 requests for I/O initiated by sendfile vmstat -z|grep -E '^ITEM|mbuf': ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP mbuf_packet: 256, 1587540, 10239, 1652,84058893, 0, = 0 mbuf: 256, 1587540, 671533, 1206,914478880, 0, = 0 mbuf_cluster: 2048, 985360, 11891, 9, 11891, 0, 0 mbuf_jumbo_page: 4096, 124025, 8128, 512,15011847, 0, 0 mbuf_jumbo_9k: 9216, 36748, 0, 0, 0, 0, 0 mbuf_jumbo_16k: 16384, 20670, 128, 0, 128, 0, 0 mbuf_ext_refcnt: 4, 0, 0, 0, 0, 0, 0 vmstat -m: Type InUse MemUse HighUse Requests Size(s) NFSD lckfile 1 1K - 1 256 filedesc 103 383K - 1134731 = 16,32,128,2048,4096,8192,16384,65536 sigio 1 1K - 1 64 filecaps 0 0K - 973 64 kdtrace 292 59K - 1099386 64,256 kenv 121 13K - 125 16,32,64,128,8192 kqueue 14 22K - 5374 256,2048,8192 proc-args 54 5K - 578448 16,32,64,128,256 hhook 2 1K - 2 256 ithread 146 24K - 146 32,128,256 KTRACE 100 13K - 100 128 NFS fh 1 1K - 584 32 linker 207 1052K - 234 = 16,32,64,128,256,512,1024,2048,4096,8192,16384,65536 lockf 29 3K - 20042 64,128 loginclass 2 1K - 1192 64 devbuf 17205 36362K - 17523 = 16,32,64,128,256,512,1024,2048,4096,8192,65536 temp 149 51K - 1280113 = 16,32,64,128,256,512,1024,2048,4096,8192,16384,65536 ip6opt 5 2K - 6 256 ip6ndp 27 2K - 27 64,128 module 230 29K - 230 128 mtx_pool 2 16K - 2 8192 osd 3 1K - 5 16,32,64 pmchooks 1 1K - 1 128 pgrp 30 4K - 2222 128 session 29 4K - 2187 128 proc 2 32K - 2 16384 subproc 211 368K - 1099014 512,4096 cred 204 32K - 6025704 64,256 plimit 19 5K - 3985 256 uidinfo 9 5K - 11892 128,4096 NFSD session 1 1K - 1 1024 sysctl 0 0K - 63851 16,32,64 sysctloid 7196 365K - 7369 16,32,64,128 sysctltmp 0 0K - 17834 16,32,64,128 tidhash 1 32K - 1 32768 callout 5 2184K - 5 =20 umtx 522 66K - 522 128 p1003.1b 1 1K - 1 16 SWAP 2 549K - 2 64 bus 802 86K - 6536 16,32,64,128,256,1024 bus-sc 57 1671K - 2431 = 16,32,64,128,256,512,1024,2048,4096,8192,16384,65536 newnfsmnt 1 1K - 1 1024 devstat 8 17K - 8 32,4096 eventhandler 116 10K - 116 64,128 kobj 124 496K - 296 4096 acpiintr 1 1K - 1 64 Per-cpu 1 1K - 1 32 acpica 14355 1420K - 216546 = 16,32,64,128,256,512,1024,2048,4096 pci_link 16 2K - 16 64,128 pfs_nodes 21 6K - 21 256 rman 316 37K - 716 16,32,128 sbuf 1 1K - 41375 = 16,32,64,128,256,512,1024,2048,4096,8192,16384 sglist 8 8K - 8 1024 GEOM 88 15K - 1871 = 16,32,64,128,256,512,1024,2048,8192,16384 acpipwr 5 1K - 5 64 taskqueue 43 7K - 43 16,32,256 Unitno 22 2K - 1208250 32,64 vmem 3 144K - 6 1024,4096,8192 ioctlops 0 0K - 185700 256,512,1024,2048,4096 select 89 12K - 89 128 iov 0 0K - 19808992 16,64,128,256,512,1024 msg 4 30K - 4 2048,4096,8192,16384 sem 4 106K - 4 2048,4096 shm 1 32K - 1 32768 tty 20 20K - 499 1024 pts 1 1K - 480 256 accf 2 1K - 2 64 mbuf_tag 0 0K - 291472282 32,64,128 shmfd 1 8K - 1 8192 soname 32 4K - 1210442 16,32,128 pcb 36 663K - 76872 16,32,64,128,1024,2048,8192 CAM CCB 0 0K - 182128 2048 acl 0 0K - 2 4096 vfscache 1 2048K - 1 =20 cl_savebuf 0 0K - 480 64 vfs_hash 1 1024K - 1 =20 vnodes 1 1K - 1 256 entropy 1026 65K - 49107 32,64,4096 mount 64 3K - 140 16,32,64,128,256 vnodemarker 0 0K - 4212 512 BPF 112 20504K - 131 16,64,128,512,4096 CAM path 11 1K - 63 32 ifnet 29 57K - 30 128,256,2048 ifaddr 315 105K - 315 32,64,128,256,512,2048,4096 ether_multi 232 13K - 282 16,32,64 clone 10 2K - 10 128 arpcom 23 1K - 23 16 gif 4 1K - 4 32,256 lltable 155 53K - 551 256,512 UART 6 5K - 6 16,1024 vlan 56 5K - 74 64,128 acpitask 1 16K - 1 16384 acpisem 110 14K - 110 128 raid_data 0 0K - 108 32,128,256 routetbl 516 136K - 101735 32,64,128,256,512 igmp 28 7K - 28 256 CARP 76 30K - 83 16,32,64,128,256,512,1024 ipid 2 24K - 2 8192,16384 in_mfilter 112 112K - 112 1024 in_multi 43 11K - 43 256 ip_moptions 224 35K - 224 64,256 CAM periph 7 2K - 19 16,32,64,128,256 acpidev 128 8K - 128 64 CAM queue 15 5K - 39 16,32,512 encap_export_host 4 4K - 4 1024 sctp_a_it 0 0K - 36 16 sctp_vrf 1 1K - 1 64 sctp_ifa 115 15K - 204 128 sctp_ifn 21 3K - 23 128 sctp_iter 0 0K - 36 256 hostcache 1 32K - 1 32768 syncache 1 64K - 1 65536 in6_mfilter 1 1K - 1 1024 in6_multi 15 2K - 15 32,256 ip6_moptions 2 1K - 2 32,256 CAM dev queue 6 1K - 6 64 kbdmux 6 22K - 6 16,512,1024,2048,16384 mld 26 4K - 26 128 LED 20 2K - 20 16,128 inpcbpolicy 365 12K - 119277 32 secasvar 7 2K - 214 256 sahead 10 3K - 10 256 ipsecpolicy 748 187K - 241562 256 ipsecrequest 18 3K - 72 128 ipsec-misc 56 2K - 1712 16,32,64 ipsec-saq 0 0K - 24 128 ipsec-reg 3 1K - 3 32 pfsync 2 2K - 893 32,256,1024 pf_temp 0 0K - 78 128 pf_hash 3 2880K - 3 =20 pf_ifnet 36 11K - 9510 256,2048 pf_tag 7 1K - 7 128 pf_altq 5 2K - 125 256 pf_rule 964 904K - 17500 128,1024 pf_osfp 1130 115K - 28250 64,128 pf_table 49 98K - 948 2048 crypto 37 11K - 1072 64,128,256,512,1024 xform 7 1K - 1530156 16,32,64,128,256 rpc 12 20K - 304 64,128,512,1024,8192 audit_evclass 187 6K - 231 32 ufs_dirhash 93 18K - 93 16,32,64,128,256,512 ufs_quota 1 1024K - 1 =20 ufs_mount 3 13K - 3 512,4096,8192 vm_pgdata 2 513K - 2 128 UMAHash 5 6K - 10 512,1024,2048 CAM SIM 6 2K - 6 256 CAM XPT 30 3K - 1850 = 16,32,64,128,256,512,1024,2048,65536 CAM DEV 9 18K - 16 2048 fpukern_ctx 3 6K - 3 2048 memdesc 1 4K - 1 4096 USB 23 33K - 24 = 16,128,256,512,1024,2048,4096 DEVFS3 136 34K - 2027 256 DEVFS1 108 54K - 594 512 apmdev 1 1K - 1 128 madt_table 0 0K - 1 4096 DEVFS_RULE 55 26K - 55 64,512 DEVFS 12 1K - 13 16,128 DEVFSP 22 2K - 167 64 io_apic 1 2K - 1 2048 isadev 8 1K - 8 128 MCA 15 2K - 15 32,128 msi 30 4K - 30 128 nexusdev 5 1K - 5 16 USBdev 21 8K - 21 32,64,128,256,512,1024,4096 NFSD V4client 1 1K - 1 256 cdev 5 2K - 5 256 cxgbe 41 956K - 44 = 128,256,512,1024,2048,4096,8192,16384 ipmi 0 0K - 20155 128,2048 htcp data 127 4K - 13675 32 aesni_data 3 3K - 3 1024 solaris 142 12302K - 3189 16,32,64,128,512,1024,8192 kstat_data 6 1K - 6 64 TCP States: https://i.stack.imgur.com/G7850.png -- <http://www.goboomtown.com/>=09 Josh Gitlin Senior Full Stack Developer (415) 690-1610 x155 Stay up to date and join the conversation in Relay = <http://relay.goboomtown.com/>.
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