how to get varnish thread dump

[彭伟]

hi:

    i use the "pstack" to get varnish child process thread dump, it's ok,

but after i used "pstack" , the varnish child process disappear,

it seems the varnish parent process killed the child process and forked a
new child process

so pstack will cause the child process killed, then is there a better way
to get the thread dump

thanks for answer
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