Messages in this thread | | | Date | Tue, 11 Jan 2005 16:34:49 +0100 | From | Kevin Hilman <> | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.10-rc3-mm1-V0.7.34-01 |
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Using V0.7.34-01, I'm seeing the 'lock held at task exit time' bug. It's coming from a kernel module which in its init function creates a thread. The thread does a daemonize() and then goes to sleep waiting on a semaphore which will be up'ed elsewhere. In other words:
init_module() - sema_init(&sem, 0) - kernel_thread(thread_func, 0, 0);
thread_func() - daemonize() - down(&sem)
The BUG() (see below for log) seems to be triggered when insmod exits.
BUG: insmod/2115, lock held at task exit time! [c883225c] {&tinfo[i].sem} .. held by: insmod: 2115 [c7b6f340, 0] ... acquired at: threads_init+0x8e/0x170 [rt_kthreads] hm, PI interest held at exit time? Task: insmod: 2115 [c7b6f340, 0]------------------------- | waiter struct c4c1bf74: | w->task: insmod: 2123 [c7e68680, 0] | lock: [c883225c] {&tinfo[i].sem} .. held by: insmod: 2115 [c7b6f340, 0] ... acquired at: threads_init+0x8e/0x170 [rt_kthreads] | blocked at: thread_func+0x3d/0xb0 [rt_kthreads] -------------------------
-- Kevin Hilman http://hilman.org/kevin/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.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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