Date: Fri, 22 Aug 2014 04:49:08 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 192906] [dtrace] running dtest.pl causes VM to sporadically reboot Message-ID: <bug-192906-8-8XBIIEPYs3@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-192906-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192906 --- 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’s important that traps be caught by dtrace if required. This is implemented via hook variables such as dtrace_trap_func and dtrace_doubletrap_func. However, these can’t 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 – dtrace knows about this name and avoids instrumenting it, thus the trap occurs and dtrace is invoked without an intervening probe. The same needs to be done for dtrace_dbltrap_func. -- You are receiving this mail because: You are the assignee for the bug.home | help
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