Dmesg Segfault Error Number
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Join them; it only takes a minute: Sign up How do you read a segfault kernel log message up vote 48 down vote favorite 29 This can be a very simple question, I'm am attempting 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 the cause was a user-mode write resulting in no page being found. 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 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 95.1k15102142 asked Feb 1 '10 at 19:20 Sullenx 241143 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
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have segfault at rip rsp error 6 Meta Discuss the workings and policies of this site About Us segfault at 0 ip sp error 4 Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us segfault error 15 Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes http://stackoverflow.com/questions/2179403/how-do-you-read-a-segfault-kernel-log-message 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 segfaults are not logging into /var/log/messages up vote 4 down vote favorite 1 I'm using Red Hat Enterprise Linux Server release 5. In this whenever a user process crashes due http://serverfault.com/questions/518623/segfaults-are-not-logging-into-var-log-messages to segmentaion faults, it was not logged in /var/log/messages. Even dmesg is also not showing any messages related to this. Where as in another distributions (Cent OS 5), I've seen segfaults messages in /var/log/messages whenever my user process crashed.dmesg also showing the segfaults. Is there any settings that to enabled so that it logs segfaults into /var/log/messages. I cross checked /etc/syslog.conf of both the systems. Both are same and even /etc/sysconfig/syslog files. Now I check kernel source code, arch/x86/mm/fault.c, and found print error message of segfault to /var/log/messages only in 2.6.23 and after. Because RHEL5.4 using 2.6.18 kernel, so that it can't log the info into system log. linux segmentation-fault share|improve this question edited Jun 27 '13 at 7:15 asked Jun 26 '13 at 7:08 Scy 12113 add a comment| 3 Answers 3 active oldest votes up vote 1 down vote At least we can set kernel's control kernel.print-fatal-signals to 1 and get quite verbose log reports then: [1157230.882024] Process m (pid: 1042531, veid: 0, threadinfo ffff8804dac20000, task ffff880667b6f070) [115
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