Bug 220327

Summary:

ktrace(1) doesn't follow descendants after forks

Product:

Base System

Reporter:

Yuri Victorovich <yuri>

Component:

bin

Assignee:

freebsd-bugs (Nobody) <bugs>

Status:

Closed Not A Bug

Severity:

Affects Only Me

CC:

dchagin

Priority:

---

Version:

11.0-STABLE

Hardware:

Any

OS:

Any

Attachments:

Description	Flags
Testcase: pdfork.c	none

Description Yuri Victorovich freebsd_committer

2017-06-28 07:28:56 UTC

Created attachment 183876 [details]
Testcase: pdfork.c

The attached program pdfork.c forks and launches /bin/ls. When run under ktrace(1), child process is launched, but doesn't appear in the trace file despite of the -d flag.

> ktrace -d pdfork

Comment 1 Yuri Victorovich freebsd_committer

2017-06-28 07:29:31 UTC

FreeBSD 11.0-STABLE r317247

Comment 2 Dmitry Chagin freebsd_committer

2017-06-28 07:46:36 UTC

run ktrace with -di flags, as:

     -d      Descendants; perform the operation for all current children of
             the designated processes.
     -i      Inherit; pass the trace flags to all future children of the
             designated processes.

Comment 3 Yuri Victorovich freebsd_committer

2017-06-28 07:56:35 UTC

Thanks!