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Re: [Qemu-block] [Qemu-devel] [PATCH 1/2] nvme: don't unref ctrl_mem whe
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH 1/2] nvme: don't unref ctrl_mem when device unrealized |
Date: |
Tue, 6 Nov 2018 16:58:29 +0100 |
On Sun, 28 Oct 2018 23:29:40 -0700
Li Qiang <address@hidden> wrote:
> Currently, when hotplug/unhotplug nvme device, it will cause an
> assert in object.c. Following is the backtrack:
>
> ERROR:qom/object.c:981:object_unref: assertion failed: (obj->ref > 0)
>
> Thread 2 "qemu-system-x86" received signal SIGABRT, Aborted.
> [Switching to Thread 0x7fffcbd32700 (LWP 18844)]
> 0x00007fffdb9e4fff in raise () from /lib/x86_64-linux-gnu/libc.so.6
> (gdb) bt
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> /lib/x86_64-linux-gnu/libglib-2.0.so.0
> qom/object.c:981
> /home/liqiang02/qemu-upstream/qemu/memory.c:1732
> /home/liqiang02/qemu-upstream/qemu/memory.c:285
> util/qemu-thread-posix.c:504
> /lib/x86_64-linux-gnu/libpthread.so.0
>
> This is caused by memory_region_unref in nvme_exit.
>
> Remove it to make the PCIdevice refcount correct.
>
> Signed-off-by: Li Qiang <address@hidden>
nvme device holds a reference to ctrl_mem MemoryRegion as a parent
so MemoryRegion will be destroyed later during destruction of
nvme object when its cildren are un-parented.
Reviewed-by: Igor Mammedov <address@hidden>
> ---
> hw/block/nvme.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index fc7dacb816..359a06d0ad 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -1331,9 +1331,6 @@ static void nvme_exit(PCIDevice *pci_dev)
> g_free(n->namespaces);
> g_free(n->cq);
> g_free(n->sq);
> - if (n->cmbsz) {
> - memory_region_unref(&n->ctrl_mem);
> - }
>
> msix_uninit_exclusive_bar(pci_dev);
> }
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Igor Mammedov <=