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ed1828ca92
Fix ACME panic (#33178) (#33186)
Backport #33178 by @wxiaoguang
Fix #33177, Manually tested:
````
1.7364311850484018e+09 info maintenance started background certificate maintenance {"cache": "0x1400ca64180"}
1.736431185054049e+09 info obtain acquiring lock {"identifier": "example.com"}
1.736431185058073e+09 info obtain lock acquired {"identifier": "example.com"}
1.736431185058133e+09 info obtain obtaining certificate {"identifier": "example.com"}
````
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>