Thanks Greg. I found the limit. it is /proc/sys/kernel/threads-max.
I count thread numbers using:
ps -eo nlwp | tail -n +2 | awk '{ num_threads += $1 } END { print num_threads }'" -o
97981
lin zhou <hnuzhoulin2@xxxxxxxxx> 于2019年2月28日周四 上午10:33写道：
Thanks, Greg. Your reply always so fast.I check my system these limits.# ulimit -acore file size (blocks, -c) unlimiteddata seg size (kbytes, -d) unlimitedscheduling priority (-e) 0file size (blocks, -f) unlimitedpending signals (-i) 257219max locked memory (kbytes, -l) 64max memory size (kbytes, -m) unlimitedopen files (-n) 65535pipe size (512 bytes, -p) 8POSIX message queues (bytes, -q) 819200real-time priority (-r) 0stack size (kbytes, -s) 8192cpu time (seconds, -t) unlimitedmax user processes (-u) 257219virtual memory (kbytes, -v) unlimitedfile locks (-x) unlimited# cat /proc/sys/kernel/pid_max196608# cat /proc/sys/kernel/threads-max100000# cat /proc/sys/fs/file-max6584236# sysctl fs.file-nrfs.file-nr = 55520 0 6584236# sysctl fs.file-maxfs.file-max = 6584236I try to count all fd:# total=0;for pid in `ls /proc/`;do num=`ls /proc/$pid/fd 2>/dev/null|wc -l`;total=$((total+num));done;echo ${total}53727I check every osd service open files limit is all 32768# for pid in `ps aux|grep osd|grep -v grep|awk '{print $2}'`;do cat /proc/$pid/limits |grep open;doneMax open files 32768 32768 filesMax open files 32768 32768 filesMax open files 32768 32768 filesMax open files 32768 32768 filesfree -gtotal used free shared buffers cachedMem: 62 46 16 0 0 5-/+ buffers/cache: 41 21Swap: 3 0 3another situation is 14 osds in five hosts appeared this problem and all in the same failure domain so far.Gregory Farnum <gfarnum@xxxxxxxxxx> 于2019年2月28日周四 上午1:59写道：The OSD tried to create a new thread, and the kernel told it no. You probably need to turn up the limits on threads and/or file descriptors.-GregOn Wed, Feb 27, 2019 at 2:36 AM hnuzhoulin2 <hnuzhoulin2@xxxxxxxxx> wrote:_______________________________________________Hi, guysSo far, there have been 10 osd service exit because of this error.the error messages are all the same.2019-02-27 17:14:59.757146 7f89925ff700 0 -- 10.191.175.15:6886/192803 >> 10.191.175.49:6833/188731 pipe(0x55ebba819400 sd=741 :6886 s=0 pgs=0 cs=0 l=0 c=0x55ebbb8ba900).accept connect_seq 3912 vs existing 3911 state standby2019-02-27 17:15:05.858802 7f89d9856700 -1 common/Thread.cc: In function 'void Thread::create(const char*, size_t)' thread 7f89d9856700 time 2019-02-27 17:15:05.806607common/Thread.cc: 160: FAILED assert(ret 0)ceph version 10.2.10 (5dc1e4c05cb68dbf62ae6fce3f0700e4654fdbbe)1: (ceph::__ceph_assert_fail(char const*, char const*, int, char const*)+0x82) [0x55eb7a849e12]2: (Thread::create(char const*, unsigned long)+0xba) [0x55eb7a82c14a]3: (SimpleMessenger::add_accept_pipe(int)+0x6f) [0x55eb7a8203ef]4: (Accepter::entry()+0x379) [0x55eb7a8f3ee9]5: (()+0x8064) [0x7f89ecf76064]6: (clone()+0x6d) [0x7f89eb07762d]NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.--- begin dump of recent events ---10000> 2019-02-27 17:14:50.999276 7f893e811700 1 - 10.191.175.15:0/192803 < osd.850 10.191.175.46:6837/190855 6953447 ==== osd_ping(ping_reply e17846 stamp 2019-02-27 17:14:50.995043) v3 ==== 2004+0+0 (3980167553 0 0) 0x55eba12b7400 con 0x55eb96ada600when I restart these osd services, it looks works well. But I do not know if it will happen in the other osds.And I can not find any error log in the system except the following dmesg info:[三 1月 30 08:14:11 2019] megasas: Command pool (fusion) empty![三 1月 30 08:14:11 2019] Couldn't build MFI pass thru cmd[三 1月 30 08:14:11 2019] Couldn't issue MFI pass thru cmd[三 1月 30 08:14:11 2019] megasas: Command pool empty![三 1月 30 08:14:11 2019] megasas: Failed to get a cmd packet[三 1月 30 08:14:11 2019] megasas: Command pool empty![三 1月 30 08:14:11 2019] megasas: Failed to get a cmd packet[三 1月 30 08:14:11 2019] megasas: Command pool empty![三 1月 30 08:14:11 2019] megasas: Failed to get a cmd packet[三 1月 30 08:14:11 2019] megasas: Command pool (fusion) empty![三 1月 30 08:14:11 2019] megasas: Err returned from build_and_issue_cmd[三 1月 30 08:14:11 2019] megasas: Command pool (fusion) empty!this cluster only used aas rbd cluster,ceph status is below:root@cld-osd5-44:~# ceph -scluster 2bec9425-ea5f-4a48-b56a-fe88e126bcedhealth HEALTH_WARNnoout flag(s) setmonmap e1: 3 mons at {a=10.191.175.249:6789/0,b=10.191.175.250:6789/0,c=10.191.175.251:6789/0}election epoch 26, quorum 0,1,2 a,b,cosdmap e17856: 1080 osds: 1080 up, 1080 inflags noout,sortbitwise,require_jewel_osdspgmap v25160475: 90112 pgs, 3 pools, 43911 GB data, 17618 kobjects139 TB used, 1579 TB / 1718 TB avail90108 active+clean3 active+clean+scrubbing+deep1 active+clean+scrubbingclient io 107 MB/s rd, 212 MB/s wr, 1621 op/s rd, 7555 op/s wr
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