Kernel Segfault Error 6
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or kernel segfault error 4 posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss segfault at ip sp error 4 Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only segfault at rip rsp error 6 takes a minute: Sign up How do you read a segfault kernel log message up vote 49 down vote favorite 29 This can be a very simple question, I'm am attempting to debug an application which generates the following segfault
Segfault Error Codes
error in the kern.log kernel: myapp[15514]: segfault at 794ef0 ip 080513b sp 794ef0 error 6 in myapp[8048000+24000] Here are my questions: Is there any documentation as to what are the diff error numbers on segfault, in this instance it is error 6, but i've seen error 4, 5 What is the meaning of the information at bf794ef0 ip 0805130b sp bf794ef0 and myapp[8048000+24000]? So far i was able to compile with symbols, and when i do a x 0x8048000+24000 it returns dmesg segfault error 4 a symbol, is that the correct way of doing it? My assumptions thus far are the following: sp = stack pointer? ip = instruction pointer at = ???? myapp[8048000+24000] = address of symbol? c++ c unix segmentation-fault syslog share|improve this question edited Mar 31 '10 at 0:25 Charles Duffy 95.9k15103144 asked Feb 1 '10 at 19:20 Sullenx 246143 Added [unix] [segmentation-fault] [syslog] tags. –Emile Cormier Feb 1 '10 at 19:41 add a comment| 3 Answers 3 active oldest votes up vote 32 down vote Based on my limited knowledge, your assumptions are correct. sp = stack pointer ip = instruction pointer myapp[8048000+24000] = address If I were debugging the problem I would modify the code to produce a core dump or log a stack backtrace on the crash. You might also run the program under (or attach) GDB. The error code is just the architectural error code for page faults and seems to be architecture specific. They are often documented in arch/*/mm/fault.c in the kernel source. My copy of Linux/arch/i386/mm/fault.c has the following definition for error_code: bit 0 == 0 means no page found, 1 means protection fault bit 1 == 0 means read, 1 means write bit 2 == 0 means kernel, 1 means user-mode My copy of Linux/arch/x86_64/mm/fault.c adds the following: bit 3 == 1 means fault was an instruction fetch share|improve this answer edited Jan 23 '15 at 9:02 fduff 1,88511526 answered Feb 1 '10 a
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The Cause Was A User-mode Write Resulting In No Page Being Found.
Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack http://stackoverflow.com/questions/2179403/how-do-you-read-a-segfault-kernel-log-message Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Interpreting segfault messages up vote 23 down vote favorite 18 What is the correct interpretation of the following segfault messages? segfault at 10 ip http://stackoverflow.com/questions/2549214/interpreting-segfault-messages 00007f9bebcca90d sp 00007fffb62705f0 error 4 in libQtWebKit.so.4.5.2[7f9beb83a000+f6f000] segfault at 10 ip 00007fa44d78890d sp 00007fff43f6b720 error 4 in libQtWebKit.so.4.5.2[7fa44d2f8000+f6f000] segfault at 11 ip 00007f2b0022acee sp 00007fff368ea610 error 4 in libQtWebKit.so.4.5.2[7f2aff9f7000+f6f000] segfault at 11 ip 00007f24b21adcee sp 00007fff7379ded0 error 4 in libQtWebKit.so.4.5.2[7f24b197a000+f6f000] linux qt webkit kernel segmentation-fault share|improve this question asked Mar 30 '10 at 22:40 knorv 16.1k61172269 possible duplicate of stackoverflow.com/questions/2179403/… –Charles Duffy Mar 31 '10 at 0:21 add a comment| 3 Answers 3 active oldest votes up vote 43 down vote accepted Hmm. 4 is EINTR (interrupted system call). It may be that libQtWebKit is habitually mishandling that error, or it may be that there's something else that's going on. If this were a program, not a shared library Run addr2line -e yourSegfaultingProgram 00007f9bebcca90d (and repeat for the other instruction pointer values given) to see where the error is happening. Better, get a debug-instrumented build, and reproduc
all about efficiency Accounting Project Human Resources Recruitment Employees Expenses Appraisal Fleet Leaves Inventory Purchase Manufacturing MRP PLM Maintenance Quality Productivity Tools Great Tools = Happy People https://www.odoo.com/forum/help-1/question/segfault-error-in-log-file-how-do-i-start-troubleshooting-that-89016 Communication Discuss Mailing Lists Notes Timesheet Email Marketing Events Survey Live Chat Odoo Studio | Third party apps Tour Pricing Community Docs Odoo Help Welcome! This community is for beginners and http://www.doulos.com/knowhow/arm/Embedded_Linux_Debugging_User_Space_Seg_Faults/ experts willing to share their Odoo knowledge. It's not a forum to discuss ideas, but a knowledge base of questions and their answers. Hide Intro Register Toggle navigation Help Trending segfault error Newest People Tags Badges Ask a Question -1 segfault error in log file - how do I start troubleshooting that ? cron python2.7 failed dump pipe By amal on 8/3/15, 12:19 AM • 2,689 views HII got this error massage .and i did not find any Solution for it Suddenly odoo in the server does not run and i did not know why kernel segfault error Aug 1 11:33:40 odoo kernel: [4594248.334971] python[22204]: segfault at 24 ip 00000000005bb5ef sp 00007f33d67fedd0 error 6 in python2.7[400000+2bd000]odoo kernel: [4594248.334971] python[22204]: segfault at 24 ip 00000000005bb5ef sp 00007f33d67fedd0 error 6 in python2.7[400000+2bd000]Aug 1 11:33:41 odoo kernel: [4594248.938503] Core dump to |/usr/share/apport/apport 1143 11 0 1143 pipe failedAug 1 12:17:01 odoo CRON[22409]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)Aug 1 13:17:01 odoo CRON[23495]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)*odoo is name of the database Flag Reply Comment Share Post 1 Ahmed M.Elmubarak --Ahmed M.Elmubarak-- Odoo Inc. http://www.odoo.com 2763 | 5 3 5 Sudan --Ahmed M.Elmubarak-- Ahmed M.Elmubarak On 8/3/15, 9:39 AM Hello,I don't know the answer but I found these links may related to your question link , link2 Thanks Flag Comment Post Your Answer Please try to give a substantial answer. If you wanted to comment on the question or answer, just use the commenting tool. Please remember that you can always revise your answers - no need to answer the same question twice. Also, please don't forget to vote - it really helps to select the best questions and answers! P
EmbeddedVideo Gallery Products ReferenceGuidesBuyOnlinePricingRefund Policy myDoulos Developing & Delivering KnowHow VHDL FPGA Verilog SystemC TLM-2.0 SystemVerilog OVM UVM VMM PSL Perl Tcl/Tk ARM / Embedded Video Gallery Home > Knowhow > Arm > Embedded Linux: Debugging User Space Seg Faults Embedded Linux: Debugging User Space Seg Faults Simon Goda, Doulos Embedded, 2014 A memory scribble or some other access violation in user space is likely to cause an undefined instruction or a data abort exception which will trigger a "SIGSEGV" segmentation fault, e.g.: target$ ./my_app Segmentation fault target$ The basic information provided does not provide any clues as to what the problem is. In this article we take a brief look at some of the tools there available in a typical embedded Linux development environment which can help to track down the problem. We're assuming here embedded Linux running on a target board but these techniques could also be used for a host application. Kernel Messages First check the kernel messages in the serial console connected to the target, or use dmesg directly on the target to retrieve these. Look for messages related to the problem application: target$ ./my_app Segmentation fault target$ dmesg ... [ 1962.987529] myapp[3303]: segfault at 0 ip 00400559 sp 5bc7b1b0 error 6 in myapp[400000+1000] ... Here we can see some information about the cause of the fault i.e. the instruction pointer address (ip) and the stack pointer address (sp). We can also see that the segfault has occurred at address 0. Static Analysis There are some useful utilities you can use to make sense of this information by performing a static analysis of the application binary. In your toolchain the name of the tool may well be prefixed to indicate the target architecture they support e.g. arm-none-linux-gnueabi-nm. nm nm will provide a listing of all of the symbols and their addresses in the application binary file: target$ nm myapp 00000000 a 00601034 b .bss 00601034 B __bss_start 00000000 n .comment 00601