When will the thread id printed by DLOG be 1?

[Leon]

For example, some DLOG prints just like:

[1: 1: 0113/144501.174655: ERROR: xxxx.cc(102)] XXXXX

Why the thread id is just 1? Thanks.

[Ken Rockot]

In a sandboxed process, on the main thread.

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[Primiano Tucci]

Yup that's because, as a sandboxing mechanism, the child processes are in a different pid namespace.

See http://man7.org/linux/man-pages/man7/pid_namespaces.7.html