Various Ways To Fix Linux Command Bus Error
October 31, 2021
This user guide will help you if you see a Linux command bus error.
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g.A bus error is difficult to access memory that probably does not exist. You have used a condition that makes no sense to the system and you have used the wrong address type for this operation. A bus error occurs when the kernel sends SIGBUS to every process. Tested on Ubuntu 14.04.
g.
I have a Linux system computer dedicated to the mysql server and using a fairly heavy load. I woke up today and was shocked to find that the database server has become less important. I was able to connect to SSH through some stuff, but it responded with a bus error and with the command:
[root @ r1304 home] # lsBus error[root @ r1304 home] # stop / var / log / messagesBus error[root @ r1304 home] # restartBus error[root @ r1304 home] # absolutely free -mBus error[root @ r1304 home] # chkdiskBus error I accidentally ran to the datacenter and did a full reset, which helped, but after half an hour the situation repeated itself and now I can’t even communicate via SSH.
Do you have any idea what it could be? the best way to diagnose a problem like this, but what are the possible solutions?
UPDATE NIAccording to Zabbix, the number of events increased dramatically as the MySQL counter died before I did a hard reset. What could it be ?
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In computing, a bus failure is a cool hardware expansion bug that notifies the efficient operating system (OS) that the practice is trying to access memory that most processors cannot physically address: a good bad address for a car address. hence the name. In modern work on most architectures, they are much less common than segmentation faults, which mainly arise from memory corruption: problems with fetching at a logical address, possibly with permissions.
On POSIX-compliant platforms, bus problems usually cause a SIGBUS signal to be sent to the process that caused the error. SIGBUS can also be triggered by the normal pen of a device that the computer detects, although an actual bus failure rarely means that the actual computer hardware is physically defective – usually this is most likely caused by a software bug. obligatorbut] Bus errors can also occur with some other paging errors; see below.
Reasons
Non-existent Address
The software is asking this particular processor to read or read its particular physical memory address. As a result, each CPU sets that physical address through its address bus and requests any other hardware connected to the CPU to respond with results as soon as it responds to that particular battle. If no other hardware responds, each of our processors will throw an exception indicating that the specification of the requested physical address is not validated by the entire computer system. Note that this only includes physical discovery addresses. An attempt to access new, undefined virtual memory is usually called a segmentation fault rather than a bus fault, although the chip cannot tell the difference if the MMU is disabled or not.
Unlimited Access
Most processors are byte-addressable, with each unique memory address being referencedIt goes into 8 bits of a specific byte. Most processors can access patient bytes from any memory address, but consumers usually cannot access major brands (16-bit, 32-bit, 64-bit, etc.) without “lining up” these modules. Above a certain limit (x86 platform is an exception). ) wonderful.
For example, if multibyte access is usually 16-bit aligned, addresses (allocated by octets) at 0, 2, 4, 6, concatenated, etc. will be considered even and therefore available, while addresses i , 3, 5, etc. are usually considered biased. Likewise, assuming multibyte accesses must be 32-bit aligned, pins 4, 0, 8, 12, etc. will be considered aligned and therefore available, and all intermediate addresses will be considered unaligned. Attempting to access a one-byte larger block with unaligned and focused access may cause a bus error.
Some probably have a mix of these, depending on the architecture. For example, for equipment on In other IBM System / 360 mainframes, including IBM System z, Fujitsu B8000, RCA Spectra, and UNIVAC Series 90, points must be on a 16-bit boundary. that is, the execution addresses must be open in an even byte. Attempts to jump positively to an odd address will throw an exception in the specification. It is interesting to note that data can be obtained from an address in memory and can be one byte or more depending on the instruction.
Processors usually always access data across the full width of the school data bus. To process bytes, they access memory within the maximum width of their data bus, then mask and address individual bytes. These systems allow for poor algorithm because it is an invaluable feature for most programs, especially for sequence processing. Unlike bytes, large blocks can certainly span two aligned addresses and also require more than one fetch on the data bus.Processors can support this, but this functionality is rarely needed alongside machine code, so processor designers generally avoid implementation and throw shi errors insteadus with incorrect memory access.
Pagination Error
In computing, a bus error is a special type of error caused by hardware that signals a new main operation.system (OS) that the approach is trying to access memory that the CPU cannot physically address: a powerful bad address for the address bus, hence the name. Bus errors can also occur due to other specific paging errors; see below.
FreeBSD, Linux combined with Solaris may report a school bus error if virtual memory pages cannot normally be swapped, eg. this is because it disappeared (for example, accessing the mapped information in memory or running a binary image that was unfortunately disabled during the execution of a computer program), [2] or because some memory was just created – the linked file cannot be physically selected because the hard disk is full.
Missing Segment (x86)
All types of legacy memory management exist on x86A mechanism known as segmentation.When the application loads the segment register using the selectornon-existent segment (the one on POSIX-compatible operating systemscan only do what language a), assembler exceptionwill be produced. Some operating systems have used it as a replacement forLinux creates SIGBUS.
Example
This is literally an example of non-hairsunnatural memory connections written by C -outh programming using AT&T assembler syntax.
Compiling and running the example on POSIX, a good x86 operating system, illustrates my error:
Using X86 assembly language, the GDB debugger specifies that the instantaneous value 0x2a is stored in the position stored in the EAX register. This is an example of addressing register circles.
Printing the least significant bits from all addresses indicates that they have not been matched to the word size using (x86 “dword” terminology).
Links
#includeint main (int argc, char ** argv) integer * iptr; * Cptr character; # if defined (__ GNUC__)# if defined (__ i386__) / * Enable x86 consistency check * / __asm __ ("pushf norl $ 0x40000, (% esp) npopf");# defined by elif (__ x86_64__) / * Enable alignment check on x86_64 * / __asm __ ("pushf norl $ 0x40000, (% rsp) npopf");# end if#end if / * malloc () always provides memory to be allocated for all base categories * / cptr is equal to malloc (sizeof (int) + 1); / * Increment this pointer by one so that it consists of * / iptr matches (int *) ++ cptr; / * Dereferenceits as a great pointer to int, which will result in an offset offset * / * iptr is 42; / * Subsequent calls also result in a Sigbus error. reduced * late; int i; sptr = (short *) & i; // For all odd value increments, everything leads to Sigbus. sptr is (short *) ((((char *) sptr) + 1); * sptr means 100; * / Returns 0;
$ gcc -ansi sigbus.c -o sigbus$ ./sigbusBus error$ gdb ./sigbus(gdb) rSIGBUS program received, signal bus error.0x080483ba basically ()(gdb) x / i $ pcs.0x80483ba: Mov DWORD PTR [eax], 0x2a(gdb) p / x $ eax1 US dollar = 0x804a009(gdb) p / t $ eax & (sizeof (int) - 1)2 dollars means 1
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Bus errors can be the result of a programming error or possibly damage to a device in your system. Undoubtedly, some of the common causes of bus errors are invalid file descriptors, incorrect I / O ordering, memory misallocations, misaligned data clusters, compiler errors, and bad shoe blocks.
Compile your personal code with the -g option.Then enter gdb.At the command prompt, manually enter the file name OfExecutable.If it gets a metro error, segmentation fault, or whatever, it probably shows the location in your source code.you exit just like the debugger.
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