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Subject: [Bug 192906] [dtrace] running dtest.pl causes VM to sporadically
 reboot
Date: Fri, 22 Aug 2014 04:49:08 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D192906

--- Comment #1 from Garrett Cooper <ngie@FreeBSD.org> ---
Note from Anton Rang @ isilon (Isilon had fixed a similar/potentially same
issue
in 7.x):

From: Rang, Anton
Sent: Thursday, August 21, 2014 11:12 PM
To: 'Cooper, Garrett'
Subject: dtrace bug

When dtrace is running, it=E2=80=99s important that traps be caught by dtra=
ce if
required. This is implemented via hook variables such as dtrace_trap_func a=
nd
dtrace_doubletrap_func. However, these can=E2=80=99t be checked from normal=
 C
functions, since dtrace may add a probe at the start of the function, which
causes a trap before the check, which causes an infinite loop.

For dtrace_trap_func, a special trap_check function is used =E2=80=93 dtrac=
e knows
about this name and avoids instrumenting it, thus the trap occurs and dtrac=
e is
invoked without an intervening probe.

The same needs to be done for dtrace_dbltrap_func.

--=20
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