很奇怪，我用万用表的黑表笔接ESP32(ESP32-WROOM-32U)的GND引脚，芯片就会重启，以下是报错信息：
Core 0 register dump:
PC : 0x400868f2 PS : 0x00060034 A0 : 0x80086dba A1 : 0x3ffbd600
A2 : 0x3ffbdf34 A3 : 0xb33fffff A4 : 0x00060023 A5 : 0x003fffff
A6 : 0x00060021 A7 : 0x00000000 A8 : 0x0000abab A9 : 0x0000cdcd
A10 : 0x0000abab A11 : 0x00060023 A12 : 0x00060021 A13 : 0x3ffbd6b0
A14 : 0x00000003 A15 : 0x00060b23 SAR : 0x00000013 EXCCAUSE: 0x00000006
EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x00000000 LCOUNT : 0x00000000
ELF file SHA256: 0000000000000000
Backtrace: 0x400868f2:0x3ffbd600 0x40086db7:0x3ffbd630 0x40088730:0x3ffbd650 0x400886e6:0xa5a5a5a5
Rebooting...
ets Jun 8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5828
entry 0x400806a8