Thanks for the reply. The spid is still hanging as Maintenance Token, here is the stacktrace:
1> dbcc stacktrace(16)
2> go
Start dbcc stacktrace...
pc: 0x0000000001504DFB upsleepgeneric+ 0x51b (0x0000000025355332, 0x0000000000000000, 0x0000000000000002, 0x0000000000004000)
pc: 0x0000000000CBEFA2 sb__start+ 0x442 (0x0000000025355320, 0x00000000043BEA20, 0x00000000043BE960, 0x0000000026D60930)
pc: 0x0000000000CBE593 sb_create+ 0x93 (0x0000000025356160, 0x0000000000000003, 0x0000000026D22B10, 0x000000000093F476)
pc: 0x0000000000CBE285 sb_getsite+ 0x165 (0x0000000025349800, 0x00000000043BEA20, 0x0000000000000000, 0x0000000025349800)
pc: 0x0000000000CC374A lc__fill+ 0x3a (0x0000000000000000, 0x00000000043BEA20, 0x0000000025349800, 0x0000000000000000)
pc: 0x0000000000CC2707 lc_newconn+ 0xa7 (0x0000000026D21EF0, 0x00000000043BEA59, 0x000000000000000B, 0x00000000043BFB90)
pc: 0x000000000047DCCB openremote+ 0x1db (0x0000000026D20003, 0x00000000043BFB90, 0x0000000026D21EF0, 0x000000000000000B)
pc: 0x0000000000FC9583 estremote+ 0x383 (0x0000000026D21EF0, 0x0000000000000000, 0x00000000043BFEF8, 0x00000000043BFEF8)
pc: 0x000000000110469B xpserver_shutdown+ 0x7b (0x0000000000000000, 0x00000000043BFEF8, 0x0000000000000000, 0x0000000000000000)
pc: 0x0000000000402608 scm_esp_stop+ 0x28 (0x0000000000005000, 0x0000000000000000, 0x00000000043BFEF8, 0x0000000000005000)
pc: 0x0000000001527F52 uistopxpsrv+ 0x182 (0x0000000000000001, 0x0000000000000001, 0x0000000000000000, 0x00000000254C88F0)
pc: 0x000000000042A667 esp_xps_startup_handler+ 0x137 (0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000030)
pc: 0x00000000015013C4 kpntwrapper+ 0x74 (0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000)
pc: 0x0000000077A2866D CreateFiberEx+ 0x27d (0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000)
dbcc stacktrace finished.
DBCC execution completed. If DBCC printed error messages, contact a user with System Administrator (SA) role.