syzkaller mmap /dev/mem中不存在的物理地址，后续访问触发synchronize external abort

> _**请尽量提供详细的信息，如缺乏必要的定位信息，则缺陷不会被定位**_ ## 环境信息 【OS版本】（如openEuler-22.03-LTS，参考命令"cat /etc/os-release"结果） EulerOS SP13 【内核版本】 kernel-5.10.0 【硬件平台】（缺陷相关的硬件信息，如：处理器型号、内存、磁盘、网卡、BIOS 等信息） kunpeng 920 【组网信息】（和网络、性能相关的问题，应该说明详细的组网和场景信息） ## 缺陷信息 执行Syzcaller用例，虚拟机报synchronize external abort. [ 48.863967] Internal error: synchronous external abort: ffffffff96000010 [#1] SMP [ 48.864534] Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_tables ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_raw iptable_security rfkill ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables sunrpc nls_cp437 vfat fat sg fuse sch_fq_codel ext4 mbcache jbd2 sd_mod t10_pi virtio_gpu virtio_net virtio_scsi net_failover ghash_ce failover virtio_console virtio_dma_buf sha2_ce sha256_arm64 sha1_ce virtio_pci virtio_mmio virtio virtio_ring dm_mirror dm_region_hash dm_log dm_mod aes_neon_bs aes_neon_blk aes_ce_blk crypto_simd cryptd aes_ce_cipher [ 48.869932] CPU: 1 PID: 2560 Comm: a.out Kdump: loaded Tainted: G OE 5.10.0test+ #3 [ 48.870667] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 [ 48.871248] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--) [ 48.871785] pc : cmpxchg_futex_value_locked+0xe0/0x12c [ 48.872238] lr : cmpxchg_futex_value_locked+0xa0/0x12c [ 48.872699] sp : ffff800014113b30 [ 48.873007] x29: ffff800014113b30 x28: ffff0000c0899d44 [ 48.873474] x27: 0000000014000400 x26: 0000000014000400 [ 48.873947] x25: 0000000000000000 x24: ffff800014113c18 [ 48.874412] x23: 0000ffffffffffff x22: 0000000094000400 [ 48.874875] x21: 0000000014000400 x20: ffff800014113b74 [ 48.875338] x19: 0000ffffa0724000 x18: 0000000000000000 [ 48.875801] x17: 0000000000000000 x16: 0000000000…