Hi,
I'm running strace-4.5.18 (on Gentoo).
I'm facing unability to strace a process tree with one process in the
middle of the tree calling clone() with CLONE_NEWPID included in the
flags.
Let's name processes Pn:m (n process number, m process' PID namespace)
strace -ff ./namespace-starter
P1:1 clone(flags=...|CLONE_NEWPID|...)=1234
(P2:2 has pid 1234 in context 1)
P1:1 ... (doing various things)
P2:2 ... (doing various things)
P2:2 clone()=2
(P3:2 has pid 2 in context 2, pid=1235 in context 1)
P2:2 waitpid(2,
(this is fine)
Strace creates a log file .2 (for the last created process) but from
here on nothing happens anymore. Is strace trying to trace a kernel
thread that happens to have pid=2 in context 1?
P3:2 is stuck in 'T' state; P2:2 is waiting on P3:2. Only way to get
things running again is to kill strace though then tracing stops as
well!
Note: strace seems not to know anything about any CLONE_NEW* flags
except for CLONE_NEWNS
Any chance that tracing across PID namespaces has been fixed in git?
Regards,
Bruno
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