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id = 2276
title = "qemu crash for suspend and resume vm while backup disk of vm"
state = "opened"
created_at = "2024-04-10T01:06:24.572Z"
closed_at = "n/a"
labels = ["Storage", "device:virtio"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2276"
host-os = "centos9"
host-arch = "ARM"
qemu-version = "qemu-7.0、qemu-7.1、qemu-7.2、qemu-8.0"
guest-os = "- OS/kernel version:"
guest-arch = "## Description of problem"
description = """"""
reproduce = """1. virsh create vm2.xml
2. virsh backup-begin domid
3. virsh suspend domid
4. sleep 1 && virsh resume domid
qemu crash"""
additional = """static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
bool update_root_node, Error **errp)
{
BlockDriverState *bs = blk_bs(blk);
ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
int ret;
if (bs) {
bdrv_ref(bs);
if (update_root_node) {
ret = bdrv_child_try_set_aio_context(bs, new_context, blk->root,
errp);
if (ret < 0) {
bdrv_unref(bs);
return ret;
}
}
if (tgm->throttle_state) {
_ ****bdrv_drained_begin(bs);----- bs->aio_context->lock lock count is 0,so unlock failed**_
throttle_group_detach_aio_context(tgm);
throttle_group_attach_aio_context(tgm, new_context);
bdrv_drained_end(bs);
}
bdrv_unref(bs);
}
blk->ctx = new_context;
return 0;
}"""
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