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mos: core dump aborted

My program ran for 40 minutes, and encountered a problem as follows:

[Jul 1 19:36:22.870] Exception 20 @ 0x00000000, vaddr 0x00000000
[Jul 1 19:36:22.870] A0: 0x4010628e A1: 0x3ffe8e60 A2: 0x00000000 A3: 0x40106814
[Jul 1 19:36:22.870] A4: 0xffffffe0 A5: 0x0000000e A6: 0xffffffff A7: 0x00000020
[Jul 1 19:36:22.870] A8: 0x00000000 A9: 0x00001840 A10: 0x3ffef298 A11: 0xffff8000
[Jul 1 19:36:22.870] A12: 0x3ffeeff4 A13: 0x00000000 A14: 0x00000000 A15: 0x0000000d
[Jul 1 19:36:22.870]
[Jul 1 19:36:22.870] (exc SP: 0x3ffe8cc0)
[Jul 1 19:36:22.870]
[Jul 1 19:36:22.870] --- BEGIN CORE DUMP ---
[Jul 1 19:36:22.870] mos: catching core dump
[Jul 1 19:36:22.870] mos: core dump aborted
[Jul 1 19:36:22.870]
[Jul 1 19:36:22.870] (exc SP: 0x3ffe8840)
[Jul 1 19:36:22.870]
[Jul 1 19:36:22.870] --- BEGIN CORE DUMP ---
[Jul 1 19:36:22.870] mos: catching core dump
[Jul 1 19:36:22.870] mos: core dump aborted
[Jul 1 19:36:22.870]
[Jul 1 19:36:22.870] (exc SP: 0x3ffe83c0)
[Jul 1 19:36:22.870]
[Jul 1 19:36:22.870] --- BEGIN CORE DUMP ---
[Jul 1 19:36:22.870] mos: catching core dump

my mos version:
$Micah mos --version
The Mongoose OS command line tool
Version: 2.3
Build ID: 20180615-180013/2.3@7ca03a27
Update channel: release

My platform is ESP8266.

Is anybody know what's wrong with it? And how can I deal with this problem? Thanks!!

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