Does your log mention database corruption?

Not sure.

Include required information

• which version of Syncthing and what operating system you are using
  1.27.1 Windows
  Fresh downloaded, and files are intact.

• what happened,

D:\syncthing-windows-amd64-v1.27.1>syncthing.exe --version
Exception 0xc0000005 0x8 0x0 0x0
PC=0x0

runtime.asmstdcall()
runtime/sys_windows_amd64.s:65 +0x75 fp=0x22fca0 sp=0x22fc80 pc=0x473dd5
rax 0x0
rbx 0x1a27f20
rcx 0x1a88240
rdi 0x7fffffde000
rsi 0x22fea0
rbp 0x22fde0
rsp 0x22fc78
r8 0x0
r9 0x22fee0
r10 0x1a59a38
r11 0x21
r12 0x22fec0
r13 0x1
r14 0x1a27480
r15 0x0
rip 0x0
rflags 0x10293
cs 0x33
fs 0x53
gs 0x2b

• what you expected to happen instead, and
• any steps to reproduce the problem.

Old version works, till syncthing auto upgrades to 1.27.1.

D:\syncthing-windows-amd64-v1.27.0\syncthing-windows-amd64-v1.27.0>syncthing.exe -version
syncthing v1.27.0 "Gold Grasshopper" (go1.21.3 windows-amd64) builder@github.syncthing.net 2023-11-27 03:45:21 UTC