Kernel Error 4
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Segfault Error Codes
helping each other. Join them; it only 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
Segfault Error 14
to debug an application which generates the following segfault 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 segfault at rip rsp error 6 able to compile with symbols, and when i do a x 0x8048000+24000 it returns 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/fau
you get. So you have a message like the following: segfault at bfea3fec ip 080ee07e sp bfea3fa0 error 6 You might already know that
Segfault Error 15
ip means instruction pointer and sp means stack pointer and as such kernel ptymonitor the addresses that follow them are the values in those registers. But what does the error number mean? libc 2.12 so segfault error 4 The error number, or code, actually gives you a better explanation of what the cause of the segfault is. The number's bits are flags describing the error and are architecture-dependent. For http://stackoverflow.com/questions/2179403/how-do-you-read-a-segfault-kernel-log-message x86/x86_64 I just wrote an online converter/decoder that you can use to explain the segfault error code. As an example, the above error code is explained as: The cause was a user-mode write resulting in no page being found. And the common error 4: The cause was a user-mode read resulting in no page being found.(also known as a null pointer dereference). https://rgeissert.blogspot.com/2013/07/explaining-segmentation-fault-errors.html Enjoy. Posted by Raphael Geissert at 02:30 Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest Labels: error, segfault, tool 4 comments: Anonymous12 July 2013 at 15:14Awesome!ReplyDeleteNils14 February 2014 at 10:08Thanks Raphael, just what I needed. ReplyDeleteAnonymous14 July 2014 at 02:14Really nice....Thanks a lotReplyDeleteJwjenkins3614 October 2014 at 20:59thank you!ReplyDeleteAdd commentLoad more... Newer Post Older Post Home Subscribe to: Post Comments (Atom) Popular Posts Explaining segmentation fault errors Editing Debian online with sources.debian.net Debian squeeze LTS Edit Debian, with iceweasel Blog Archive ► 2015 (7) ► August (2) ► June (1) ► May (1) ► April (2) ► January (1) ► 2014 (3) ► December (1) ► April (1) ► March (1) ▼ 2013 (37) ► November (1) ► October (3) ► September (4) ► August (3) ▼ July (2) Ten years-old ebook reader Explaining segmentation fault errors ► June (2) ► May (4) ► April (1) ► March (5) ► February (5) ► January (7) ► 2012 (26) ► December (6) ► November (1) ► October (3) ► September (1) ► July (2) ► June (4) ► May (3) ► April (3) ► March
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions http://askubuntu.com/questions/713097/error-4-in-libframe you might have Meta Discuss the workings and policies of http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and segfault error developers. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Error 4 in libframe up vote 0 down vote favorite I have a Dell Latitude. Every once in a while when after segfault at rip closing the laptop's lid and reopening it, Ubuntu (or, probably, something in Ubuntu) crashes, and I see a login screen after which everything looks as if I have just rebooted. The last time it happened I have found the following line in my kernel log: kernel: [83350.495880] compiz[2291]: segfault at 7b5e ip 00007fec9a51fc34 sp 00007ffc7dff4b68 error 4 in libframe.so.6.0.0[7fec9a51a000+1c000] I am not sure whether this is the cause of the above mentioned issue, but this seems new. Other than that, there are ACPI errors: kernel: [83356.330972] ACPI Error: Index value 0x0000000000000083 overflows field width 0x7 (20140424/exfldio-343) kernel: [83356.330978] ACPI Error: Method parse/execution failed [\NEVT] (Node ffff88040e047258), AE_AML_REGISTER_LIMIT (20140424/psparse-536) kernel: [83356.330984] ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPCB.ECDV._Q66] (Node ffff88040e044b90), AE_AML_REGISTER_LIMIT (20140424/psparse-536) And some gnome-seesion warnings from the syslog: gnome-session[2099]: WARNING: Application 'compiz.desktop' killed by signal 11 gnome-session[2099]: WARNING: App 'compiz.desktop' respawning too quickly gnome-session[2099]: CRITICAL: We failed, but the fail whale is dead. Sorry.... ... gnome-session[1506]: WARNING: Could not parse desktop file track
Aug 2004 on RedHat 7.3 #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such file or directory */ #define ESRCH 3 /* No such process */ #define EINTR 4 /* Interrupted system call */ #define EIO 5 /* I/O error */ #define ENXIO 6 /* No such device or address */ #define E2BIG 7 /* Arg list too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file number */ #define ECHILD 10 /* No child processes */ #define EAGAIN 11 /* Try again */ #define ENOMEM 12 /* Out of memory */ #define EACCES 13 /* Permission denied */ #define EFAULT 14 /* Bad address */ #define ENOTBLK 15 /* Block device required */ #define EBUSY 16 /* Device or resource busy */ #define EEXIST 17 /* File exists */ #define EXDEV 18 /* Cross-device link */ #define ENODEV 19 /* No such device */ #define ENOTDIR 20 /* Not a directory */ #define EISDIR 21 /* Is a directory */ #define EINVAL 22 /* Invalid argument */ #define ENFILE 23 /* File table overflow */ #define EMFILE 24 /* Too many open files */ #define ENOTTY 25 /* Not a typewriter */ #define ETXTBSY 26 /* Text file busy */ #define EFBIG 27 /* File too large */ #define ENOSPC 28 /* No space left on device */ #define ESPIPE 29 /* Illegal seek */ #define EROFS 30 /* Read-only file system */ #define EMLINK 31 /* Too many links */ #define EPIPE 32 /* Broken pipe */ #define EDOM 33 /* Math argument out of domain of func */ #define ERANGE 34 /* Math result not representable */ #define EDEADLK 35 /* Resource deadlock would occur */ #define ENAMETOOLONG 36 /* File name too long */ #define ENOLCK 37 /* No record locks available */ #define ENOSYS 38 /* Function not implemented */ #define ENOTEMPTY 39 /* Directory not empty */ #define ELOOP 40 /* Too many symbolic links encountered */ #define EWOULDBLOCK EAGAIN /* Operation would block */ #define ENOMSG 42 /* No message of desired type */ #define EIDRM 43 /* Identifier removed */ #define E