I installed mongodb in sharding, but the mongos process was down suddenly not long after the start. There's error in the log file:

2018-08-11T22:11:18.010+0800 I NETWORK [listener] connection accepted from
2018-08-11T22:11:18.011+0800 I NETWORK [listener] connection accepted from 111.199.184.231:25765 #1609 (1539 connections now open)
2018-08-11T22:11:18.037+0800 F - [conn1275] Failed to mlock: Unknown error
2018-08-11T22:11:18.037+0800 F - [conn1275] Fatal Assertion 28832 at src/mongo/base/secure_allocator.cpp 246
2018-08-11T22:11:18.038+0800 F - [conn1275]

***aborting after fassert() failure

2018-08-11T22:11:18.051+0800 F - [conn1275] Got signal: 6 (Aborted).
0x561133b129b1 0x561133b11bc9 0x561133b120ad 0x7fe63b7ac5e0 0x7fe63b40f1f7 0x7fe63b4108e8 0x561132ef0e3f 0x561133aa6ca7 0x5611335b7559 0x5611335b83c8 0x5611332a9b50 0x5611332ab7d0 0x5611334e6789 0x56113303e4c0 0x56113303f927 0x561132f43b77 0x561132f6126a 0x561132f5bf27 0x561132f5f731 0x5611333ba7b2 0x561132f5a13f 0x561132f5d2d5 0x561132f5b667 0x561132f5bfad 0x561132f5f731 0x5611333bad15 0x561133a8dc44 0x7fe63b7a4e25 0x7fe63b4d234d

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