On 03/04/2017 03:30 AM, Josh Bowman wrote: > Hi, > > I'm having a problem when trying to allocate multiple blocks using > rt_queue_alloc(). When my client code is building a message to send to > queue, it sometimes finds that it needs a bigger block. So it creates a new > block via rt_queue_alloc(); copies the data from the previous block into > the new block; and then calls rt_queue_free() on the old block. > > The code included here is a simplified version of this process. It > allocates a buffer; puts some data in it; allocates a new buffer; and then > checks to make sure the previous buffer is intact. Then it frees the > previous buffer and loops. > > When I run this code, it prints: > > ERROR: at 7, 2: after rt_queue_alloc, checkMessage failed at loc 480 > > This means the buffer previously returned by rt_queue_alloc() is damaged by > the next call to rt_queue_alloc(). I set a watch in the debugger, and it > looks like the damage is done at line 376 of lib/alchemy/queue.c; this > seems to indicate the heapobj_alloc() is returning a region that overlaps > the one previously allocated. > > I'm running Xenomai/mercury from stable-3.0.x on x86_64, with config: > "--with-core=mercury --enable-smp --enable-pshared --enable-registry > --enable-debug" > > I build the test program with: > > g++ queue-2.cpp -o queue-2 -g -fno-default-inline -fno-omit-frame-pointer > `xeno-config --skin=alchemy --cflags --no-auto-init --ldflags` > > Changing the realloc_count parameter causes the code to fail at different > iterations; passing realloc_count = 3 moves the failure to the > rt_queue_send() call. (The code runs to completion with realloc_count set > to 1 or 2.) > > I've also found that if I don't call rt_queue_free() the code runs to > completion. > > Let me know if there's anything I can do to help. >
Your test code perfectly reproduces the issue here, thanks. There is a severe bitmap breakage, I'm on it. -- Philippe. _______________________________________________ Xenomai mailing list Xenomai@xenomai.org https://xenomai.org/mailman/listinfo/xenomai
