Linux Kernel Segfault Rip Rsp Error 4
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Segfault At Rip Rsp Error 6
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Segfault At Rip Rsp Error 4 Linux
minute: Sign up What are segfault rip/rsp numbers and how to use them up vote 10 down vote favorite 5 When my linux application crashes, it produces a line in the logs something like: segfault at 0000000 rip 00003f32a823 rsp 000123ade323
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error 4 What are those rip and rsp addresses? how do I use them to pinpoint the problem? do they correspond to something in the "objdump" or "readelf" outputs? are they useful if my program gets its symbols stripped out (to a separate file, which can be used using gdb) debugging segmentation-fault share|improve this question edited Jan 12 '10 at 2:30 Bill the Lizard 223k139448737 asked Sep 21 '09 at 21:11 johnnys add a comment| 2 Answers 2 active oldest votes up vote linux segfault error 6 6 down vote Well the rip pointer tells you the instruction that caused the crash. You need to look it up in a map file. In the map file you will have a list of functions and their starting address. When you load the application it is loaded to a base address. The rip pointer - the base address gives you the map file address. If you then search through the map file for a function that starts at an address slightly lower than your rip pointer and is followed, in the list, by a function with a higher address you have located the function that crashed. From there you need to try and identify what went wrong in your code. Its not much fun but it, at least, gives you a starting point. Edit: The "segfault at" bit is telling you, i'd wager, that you have dereferenced a NULL pointer. The rsp is the current stack pointer. Alas its probably not all that useful. With a memory dump you "may" be able to figure out more accurately where you'd got to in the function but it can be really hard to work out, exactly, where you are in an optimised build share|improve this answer edited Sep 21 '09 at 21:35 answered Sep 21 '09 at 21:20 Goz 43.5k1489159 add a comment| up vote 3 down vote I got the error, too. When I saw: probe.out[28503]: segfault at 0000000000000180 rip 00000000004450c0 rsp 00007fff4d508178 error
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Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta http://serverfault.com/questions/243579/how-to-diagnose-frequent-segfaults Discuss the workings and policies of this site About 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; it only takes a minute: Sign error 4 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 I've seen them in Perl, PHP and rsync. rip rsp error 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 ipt_LOG ipt_REJECT iptable_mangle iptable_filter xt_multiport xt_state xt_limit xt_conntrack nf_conntrack_ftp nf_conntrack ip_tables x_tables loop snd _hda_codec_atihdmi snd_hda_intel snd_hda_codec snd