Kernel Segfault At Error 14
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Segfault At 0 Ip Sp Error 4
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
Segfault Error 14
following segfault messages? segfault at 10 ip 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 segfault at rip rsp error 6 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 reproduce the problem under a debugger such as gdb. Since it's a shared library You're hosed, unfortunately; it's not possible to know where the libraries were placed in memory by the dynamic linker after-the-fact. Reproduce the problem under gdb. What the error means Here's the breakdown of the fields: address (after the at) - the location in memory the code is trying to access (it's likely that 10 and 11 are offsets from a pointer we expect to be set to a valid value but which is instead pointing to 0) ip - instruction pointer, ie. where the code which is trying to do this lives sp - stack pointer error - An error code for page faults; see below for what this means on x86. /* * Page faul
you get. So you have a message like the following: segfault at bfea3fec ip 080ee07e sp bfea3fa0 error 6 You might already know that ip means instruction pointer and sp means
Segfault Error Codes
stack pointer and as such the addresses that follow them are the values in dmesg segfault error 4 those registers. But what does the error number mean? The error number, or code, actually gives you a better explanation of segfault error 15 what the cause of the segfault is. The number's bits are flags describing the error and are architecture-dependent. For x86/x86_64 I just wrote an online converter/decoder that you can use to explain the segfault http://stackoverflow.com/questions/2549214/interpreting-segfault-messages 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). Enjoy. Posted by Raphael Geissert at 02:30 Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest Labels: error, segfault, tool 4 comments: Anonymous12 https://rgeissert.blogspot.com/2013/07/explaining-segmentation-fault-errors.html 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 (3) Subscribe Posts Atom Posts Comments Atom Comments Follow by Email Translate Disclaimer Thoughts and opinions expressed in this blog are my own and not that of my employer or any related party. Copyright 2012, 2013, 2014, 2015 Raphael Geissert. Ethereal template. Powered by Blogger.
Start here for a quick overview of the site Help Center Detailed answers to any questions you might http://serverfault.com/questions/243579/how-to-diagnose-frequent-segfaults have Meta Discuss the workings and policies of this site About http://www.gossamer-threads.com/lists/linux/kernel/598127 Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; segfault error 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 How to diagnose frequent segfaults up vote 4 down vote favorite 2 My server is logging frequent segmentation faults to /var/log/kern.log in different tools. So far segfault error 4 I've seen them in Perl, PHP and rsync. All installed software is up-to-date Debian packages. Here's an exerpt from the log file: Mar 2 01:07:54 gaz kernel: [ 5316.246303] imapsync[4533]: segfault at 8b ip 00007fb448c98fe6 sp 00007ffff571dd68 error 4 in libperl.so.5.10.1[7fb448bd7000+164000] Mar 2 01:17:42 gaz kernel: [ 5904.354307] php5-cgi[4441]: segfault at 2bb3dc8 ip 0000000002bb3dc8 sp 00007fffbeeaae48 error 15 Mar 2 02:54:05 gaz kernel: [11687.922316] php5-cgi[4495]: segfault at 2d7acf9 ip 0000000002d7acf9 sp 00007fff60c6eb18 error 15 Mar 2 10:50:08 gaz kernel: [40250.390322] BUG: unable to handle kernel paging request at 00000000024b03f0 Mar 2 10:50:08 gaz kernel: [40250.390341] IP: [<00000000024b03f0>] 0x24b03f0 Mar 2 10:50:08 gaz kernel: [40250.390353] PGD 208c71067 PUD 21c811067 PMD 209329067 PTE 8000000211c88067 Mar 2 10:50:08 gaz kernel: [40250.390365] Oops: 0011 [#1] SMP Mar 2 10:50:08 gaz kernel: [40250.390373] last sysfs file: /sys/devices/pci0000:00/0000:00:12.0/host4/target4:0:0/4:0:0:0/block/sdb/stat Mar 2 10:50:08 gaz kernel: [40250.390386] CPU 1 Mar 2 10:50:08 gaz kernel: [40250.390392] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative xt_recent xt_tcpudp iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ ipv4 ip6table_filter ip6_tables xt_DSCP xt_TCPMSS ip
Post #1 of 8 (4062 views) Permalink x86_64 segfault error codes For segfault error codes on x86_64, bits 0-3 are documented in arch/x86_64/mm/fault.c. However, I am getting error 0x14 and 0x15 with this particular user app when it segfaults. Is bit 4 valid and what does that imply? xxx-001[2085]: segfault at 0000007f960ea86b rip 0000007f960ea86b rsp 0000007fbfffe968 error 14 xxx-001[2091]: segfault at 0000007fbfffe670 rip 0000007fbfffe670 rsp 0000007fbfffe668 error 15 -- -= Dave =- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo [at] vger More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ ak at suse Dec14,2005,10:31AM Post #2 of 8 (4029 views) Permalink Re: x86_64 segfault error codes [In reply to] Dave