Dmesg Segfault Error 15
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Segfault Error 14
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 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 error codes 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 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 me
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Kernel Segfault At Rip Rsp Error 4
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Dmesg Segfault Error 4
Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask http://stackoverflow.com/questions/2549214/interpreting-segfault-messages 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. All installed software is up-to-date Debian packages. Here's an exerpt from the http://serverfault.com/questions/243579/how-to-diagnose-frequent-segfaults 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_hwdep snd_pcm radeon snd_timer ttm snd drm_kms_helper soundcore drm snd_page_alloc i2c_algo_bit shpchp i2c_piix4 edac_core pcspkr k8temp evdev edac_m ce_amd pci_hotplug i2c_core button ext3 jbd mbca
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 http://www.doulos.com/knowhow/arm/Embedded_Linux_Debugging_User_Space_Seg_Faults/ 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.: http://d.hatena.ne.jp/yohei-a/20110610/1307696284 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 segfault error 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 dmesg segfault error 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 00601034 b completed.6366 00000000 a crtstuff.c 00000000 a crtstuff.c 00601030 d .data 00601030 D __data_start 00601030 W data_start ... Depending on which toolchain and binary file format you are using, it might be more use to compile the binary (if not done already) with the -g option. You can then use t
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