清除栈错误: User 42 panic

本文探讨了在使用多重继承的类AClass时,如何正确处理异常情况下的资源清理问题。特别是当类同时继承自CBase和MClass接口,并且在实例销毁过程中需要调用特定清理方法时的情况。文章详细解释了为什么直接使用CleanupStack::PushL()会导致User42panic的问题,并提出了解决方案——使用CleanupDeleteL()来避免内存泄漏并确保虚拟析构函数被正确调用。

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A C class, CSquare, uses multiple inheritance from CBase and an M class interface, MPolygon. The object is instantiated and the M class interface pushed on to the cleanup stack. The object is later destroyed by a call to PopAndDestroy(). If the pushing was done with CleanupStack::PushL(), the PushL(TAny*) would be used because the pointer is not a CBase pointerThe PushL(TAny*) overload means that User::Free() is invoked on the pointer on cleanup, but this would result in a User 42 panic. That’s because User::Free() can't find the heap information it needs to release the memory to the system when passed an M class pointer to the sub-object of a C class. Even if it could, the virtual destructor of CSquare would not be called, so the best-case scenario would be a memory leak! The solution is to use CleanupDeleteL() to call delete on the M class pointer and invoke the virtual destructor correctly for the CSquare class.

对于同时继承了cbase和m接口的类,如果使用pushL(),将会重载 PushL(TAny*) ,这就意味着异常退出会调用User::Free() 来清除,但free()不能找到内存中需要释放的信息,析构函数不能被调用,从而引发User 42 panic.解决方案就是使用CleanupDeleteL() t来调用m类指针的删除操作以及cbase析构函数。


class MPolygon
    {
 
public:
 
    virtual TInt CalculateNumberOfVerticesL() =0;
    virtual ~MPolygon(){};
 
};
 
class CSquare : public CBase, public MPolygon
    {
public:
    static CSquare* NewL();
    virtual TInt CalculateNumberOfVerticesL();
    virtual ~CSquare(){};
 
private:
    CSquare(){};
 
    };
 
enum TPolygonType { ESquare };
 
static MPolygon* InstantiatePolygonL(TPolygonType aPolygon);
 
MPolygon* InstantiatePolygonL(TPolygonType aPolygon)
    {
    if (ESquare==aPolygon)
        return (CSquare::NewL());
    else
        return (NULL);
    }
 
/*static*/ CSquare* CSquare::NewL()
    {              // No two-phase construct needed here.
    CSquare* me = new(ELeave) CSquare();
    return (me);
    }
 
TInt CSquare::CalculateNumberOfVerticesL()
    {             // Simple implementation, but others may leave.
    return (4);
    }
 
void DoStuffL()
    {
    MPolygon* square = InstantiatePolygonL(ESquare);
    CleanupDeletePushL(square);
 
    // ... Leaving calls go here.
    ASSERT(4==square->CalculateNumberOfVerticesL());
    CleanupStack::PopAndDestroy(square);
    }

[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034] [ 0.000000] Linux version 5.15.36-xilinx-v2022.2 (oe-user@oe-host) (aarch64-xilinx-linux-gcc (GCC) 11.2.0, GNU ld (GNU Binutils) 2.37.20210721) #1 SMP Mon Oct 3 07:50:07 UTC 2022 [ 0.000000] Machine model: xlnx,zynqmp [ 0.000000] earlycon: cdns0 at MMIO 0x00000000ff000000 (options '115200n8') [ 0.000000] printk: bootconsole [cdns0] enabled [ 0.000000] efi: UEFI not found. [ 0.000000] Zone ranges: [ 0.000000] DMA32 [mem 0x0000000000000000-0x00000000ffffffff] [ 0.000000] Normal [mem 0x0000000100000000-0x000000097fffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000000000000-0x000000007fefffff] [ 0.000000] node 0: [mem 0x0000000800000000-0x000000097fffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000097fffffff] [ 0.000000] On node 0, zone Normal: 256 pages in unavailable ranges [ 0.000000] cma: Reserved 256 MiB at 0x000000006b800000 [ 0.000000] psci: probing for conduit method from DT. [ 0.000000] psci: PSCIv1.1 detected in firmware. [ 0.000000] psci: Using standard PSCI v0.2 function IDs [ 0.000000] psci: MIGRATE_INFO_TYPE not supported. [ 0.000000] psci: SMC Calling Convention v1.2 [ 0.000000] percpu: Embedded 18 pages/cpu s34776 r8192 d30760 u73728 [ 0.000000] Detected VIPT I-cache on CPU0 [ 0.000000] CPU features: detected: ARM erratum 845719 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 2064132 [ 0.000000] Kernel command line: earlycon console=ttyPS0,115200 clk_ignore_unused root=/dev/mmcblk0p2 rw rootwait [ 0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, linear) [ 0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, linear) [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off [ 0.000000] Unable to handle kernel paging request at virtual address ffff00007fc00000 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000047 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x07: level 3 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000047 [ 0.000000] CM = 0, WnR = 1 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00007fc00000] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8008 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8008] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Unable to handle kernel paging request at virtual address ffff00097fff8128 [ 0.000000] Mem abort info: [ 0.000000] ESR = 0x96000006 [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits [ 0.000000] SET = 0, FnV = 0 [ 0.000000] EA = 0, S1PTW = 0 [ 0.000000] FSC = 0x06: level 2 translation fault [ 0.000000] Data abort info: [ 0.000000] ISV = 0, ISS = 0x00000006 [ 0.000000] CM = 0, WnR = 0 [ 0.000000] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000001378000 [ 0.000000] [ffff00097fff8128] pgd=180000097fff8003, p4d=180000097fff8003 [ 0.000000] Insufficient stack space to handle exception! [ 0.000000] ESR: 0x96000006 -- DABT (current EL) [ 0.000000] FAR: 0xffff00097fff8128 [ 0.000000] Task stack: [0xffff8000093a0000..0xffff8000093a4000] [ 0.000000] IRQ stack: [0x0000000000000000..0x0000000000004000] [ 0.000000] Overflow stack: [0xffff00097ef6c2b0..0xffff00097ef6d2b0] [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.36-xilinx-v2022.2 #1 [ 0.000000] Hardware name: xlnx,zynqmp (DT) [ 0.000000] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 0.000000] pc : show_pte+0x18c/0x238 [ 0.000000] lr : show_pte+0x15c/0x238 [ 0.000000] sp : ffff8000093a0020 [ 0.000000] x29: ffff8000093a0020 x28: ffff8000093b4e80 x27: 000000007fc8d978 [ 0.000000] x26: 0000000000000000 x25: 0000000000000000 x24: ffff00097efb6f80 [ 0.000000] x23: ffff800009107000 x22: ffff800009178000 x21: 0000000000000128 [ 0.000000] x20: ffff00097fff8000 x19: ffff00097fff8128 x18: ffffffffffffffff [ 0.000000] x17: 3030666666662073 x16: 736572646461206c x15: ffff8000094a7030 [ 0.000000] x14: 0000000000000010 x13: ffff8000093c6128 x12: 00000000000003ba [ 0.000000] x11: 000000000000013e x10: ffff8000093c6128 x9 : ffff8000093c6128 [ 0.000000] x8 : 00000000fffff7ff x7 : ffff8000093f2128 x6 : ffff8000093f2128 [ 0.000000] x5 : 0000000000005ff4 x4 : 40000000fffff93e x3 : 0000000000000000 [ 0.000000] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff8000090037e8 [ 0.000000] Kernel panic - not syncing: kernel stack overflow zynqmp板卡内核打印这个错误如何解决
07-03
内容概要:论文提出了一种基于空间调制的能量高效分子通信方案(SM-MC),将传输符号分为空间符号和浓度符号。空间符号通过激活单个发射纳米机器人的索引来传输信息,浓度符号则采用传统的浓度移位键控(CSK)调制。相比现有的MIMO分子通信方案,SM-MC避免了链路间干扰,降低了检测复杂度并提高了性能。论文分析了SM-MC及其特例SSK-MC的符号错误率(SER),并通过仿真验证了其性能优于传统的MIMO-MC和SISO-MC方案。此外,论文还探讨了分子通信领域的挑战、优势及相关研究工作,强调了空间维度作为新的信息自由度的重要性,并提出了未来的研究方向和技术挑战。 适合人群:具备一定通信理论基础,特别是对纳米通信和分子通信感兴趣的科研人员、研究生和工程师。 使用场景及目标:①理解分子通信中空间调制的工作原理及其优势;②掌握SM-MC系统的具体实现细节,包括发射、接收、检测算法及性能分析;③对比不同分子通信方案(如MIMO-MC、SISO-MC、SSK-MC)的性能差异;④探索分子通信在纳米网络中的应用前景。 其他说明:论文不仅提供了详细的理论分析和仿真验证,还给出了具体的代码实现,帮助读者更好地理解和复现实验结果。此外,论文还讨论了分子通信领域的标准化进展,以及未来可能的研究方向,如混合调制方案、自适应调制技术和纳米机器协作协议等。
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