threads/80887: ULE with SMP broke libpthread/libthr on 5.4-RELEASE
Steven Jurczyk
steve at post.pl
Wed May 11 04:50:03 PDT 2005
>Number: 80887
>Category: threads
>Synopsis: ULE with SMP broke libpthread/libthr on 5.4-RELEASE
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-threads
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed May 11 11:50:02 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Steven Jurczyk
>Release: 5.4-RELEASE
>Organization:
>Environment:
FreeBSD meritum2.home.net.pl 5.4-RELEASE FreeBSD 5.4-RELEASE #17: Wed May 11 11:11:01 CEST 2005 steve at meritum2.home.net.pl:/data/src/bsd/sys/i386/compile/HOME i386
>Description:
Using ULE on SMP machine broke applications which use libpthread/libthr, probably at context switching between threads... The applications simply hang and they aren't killable (kill -9 <pid> don't work).. Usually this also break kernel shutdown (can't flush some inodes or blocks)...
>How-To-Repeat:
Compile kernel with options:
options SMP
options SCHED_ULE
and try to start mysqld_server on dual dual processor (may be on Pentium IV with enabled HT)
The problem also is repeatable at 50% success rate with simple /usr/bin/host util.
Setting setenv LIBPTHREAD_SYSTEM_SCOPE usually helps to hang any pthreads application at their initialization.
>Fix:
sorry :)
>Release-Note:
>Audit-Trail:
>Unformatted:
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