Re: DTRACE build failure (/usr/obj/usr/src/tmp/usr/bin/ld: cannot find -lpthread)

On Wed, 2 Aug 2006, Kip Macy wrote:

I described it previously. Signals won't always be sent to the right
process, i.e. running a process under GDB the debuggee will sometimes
get the SIGTRAP instead of GDB. When restarting mysql, mysql-server
becomes unkillable. Removing KSE (bike_sched et al.) makes the problem
go away.

That sounds more like a bug with gdb/libthread_db. It also doesn't
sound like a major bug either, like "signals are broken with KSE"
makes it sound.

It is trivial to hit on sun4v. However, I've seen it (or a problem with
similar symptoms) on x86 using NetApp's development simulator which
makes very heavy use of signals. I believe NetApp ended up giving up on
using FreeBSD for running their simulator as this problem made FreeBSD a
non-starter for them. I no longer work for NetApp so I don't have access
to the sources for the simulator any more, so I don't know if bike_sched
fixes that problem for them or not.

-Kip


On Wed, 2 Aug 2006, Daniel Eischen wrote:

On Wed, 2 Aug 2006, Kip Macy wrote:

sun4u is a dead architecture. Signals are broken with KSE on a
tightly coupled SMP so sun4v doesn't even have KSE in the tree.

On every platform or on sparc64? I am unaware of any signal
problems in i386.

Unless someone steps up to fix KSE "will not work" is more correct.

Please clarify.

--
DE
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DE
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