|From:||Ingo Molnar <firstname.lastname@example.org>|
|Subject:||[patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-10|
|Date:||Fri, 25 Mar 2005 15:59:08 +0100|
|Cc:||"Paul E. McKenney" <email@example.com>|
i have released the -V0.7.41-10 Real-Time Preemption patch, which can be downloaded from the usual place: http://redhat.com/~mingo/realtime-preempt/ this release fixes two bugs: - one affecting SMP systems & RCU (the missing smp_mb()s) - the other one in net/xfrm/xfrm_policy.c, affecting systems where network interfaces (or pseudo-interfaces) are frequently created/destroyed i've also added a new debugging feature which is activated if RT_DEADLOCK_DETECT is enabled: the checking of active locks in freed memory. This catches a dangerous category of bugs which the upstream kernel can silently ignore (because there locks are quite 'passive'), while the -RT kernel will often go down in flames sometime later (it has lists within the lock, etc.). This mechanism found the xfrm_policy.c bug: BUG: events/0/4, active lock [e94a8cdc(e94a8cd0-e94a90dc)] freed! [<c0103e31>] dump_stack+0x1e/0x20 (20) [<c0136fa2>] check_no_locks_freed+0x158/0x210 (60) [<c01477e9>] kfree+0x59/0x15a (48) [<c03638db>] xfrm_policy_gc_task+0x6f/0x7e (28) [<c012f3c7>] worker_thread+0x1c1/0x26c (132) [<c01333e9>] kthread+0x95/0xbd (48) [<c01012c9>] kernel_thread_helper+0x5/0xb (1039269908) so i'd expect more such bugs to be found. If you had stability problems under PREEMPT_RT (hangs, crashes), please enable RT_DEADLOCK_DETECT and try to reproduce the problem and send me the resulting log messages. to create a -V0.7.41-10 tree from scratch, the patching order is: http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.11.tar.bz2 http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6... http://redhat.com/~mingo/realtime-preempt/realtime-preemp... Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to firstname.lastname@example.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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