> Yes, I was able to reproduce the issue on 3.4.4-rt13. I ran a few tests under > ftrace and got a bit more of information. > > The problem seems to happen in kmem_cache_free(), at this piece of code: > > local_lock_irqsave(slab_lock, flags); > __cache_free(cachep, objp, __builtin_return_address(0)); > unlock_slab_and_free_delayed(flags); > > It seems to fail at the local_lock_irqsave() statement with: > > [ 149.328013] kernel BUG at kernel/rtmutex.c:725! > [ 149.328013] invalid opcode: 0000 [#1] PREEMPT SMP > > And by the end I see: > > [ 149.420228] note: insmod[2801] exited with preempt_count 1 Thanks for this. Any ideas where we might go from here? This used to work in 2.6.33 but got broken between 2.6.33 and 3.0; unfortunately there don't appear to be any RT patch releases between those two versions so it's hard to see what might have been broken. It worries me a bit because this could potentially go wrong during runtime if the kernel ever reaps the lookaside cache for memory; this will then crash the entire system. Cheers, Chris -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
