Error 4 In
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Error Code 4
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 following segfault messages? segfault at 10 ip 00007f9bebcca90d error 4 linux 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 31 '10 at 0:21 add a comment| 3 Answers 3 active oldest error 4 airport 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 fault error code bits: * * bit 0 == 0: no page found 1: protection fault * bit 1 == 0: read access 1: write access
will run at once. $ ./foo Segmentation fault The machine hardly reminds you that you were over-confident. But before rushing to re-compile your program with debugging symbols
Error 4 Ichat
or adding printf() calls here and there, have a look at the output error 404 of the Linux kernel: $ dmesg foo[1234]: segfault at 2a ip 0000000000400511 sp 00007fffe00a3260 error 4 in foo[400000+1000] These
Error 4 Iphone
are some hints in dmesg output: foo is the executable name 1234 is the process ID 2a is the faulty address in hexadecimal the value after ip is the instruction pointer the http://stackoverflow.com/questions/2549214/interpreting-segfault-messages value after sp is the stack pointer error 4 is an error code the string at the end is the name of the virtual memory area (VMA) The error code is a combination of several error bits defined in fault.c in the Linux kernel: /* * Page fault error code bits: * * bit 0 == 0: no page found 1: protection fault * http://www.enodev.fr/posts/decode-segfault-errors-in-dmesg.html bit 1 == 0: read access 1: write access * bit 2 == 0: kernel-mode access 1: user-mode access * bit 3 == 1: use of reserved bit detected * bit 4 == 1: fault was an instruction fetch */ enum x86_pf_error_code { PF_PROT = 1 << 0, PF_WRITE = 1 << 1, PF_USER = 1 << 2, PF_RSVD = 1 << 3, PF_INSTR = 1 << 4, }; Since you are executing a user-mode program, PF_USER is set and the error code is at least 4. If the invalid memory access is a write, then PF_WRITE is set. Thus: if the error code is 4, then the faulty memory access is a read from userland if the error code is 6, then the faulty memory access is a write from userland Moreover, the faulty memory address in dmesg can help you identify the bug. For instance, if the memory address is 0, the root cause is probably a NULL pointer dereference. The name of the VMA may give you an indication of the location of the error: #include
error 4 on gui log in General support questions Post Reply Print view Search Advanced search 8 posts • Page 1 of 1 AlanH Posts: 4 Joined: 2013/02/21 01:51:02 Location: Richardson, TX [SOLVED] seg fault error 4 on gui log in Quote Postby http://www.centos.org/forums/viewtopic.php?t=3606 AlanH » 2013/02/21 02:41:31 Hi I am new to the forum and to Centos, so please be patient with me. I apologies in advance as this is a bit long. I am trying to set up a server for https://ubuntuforums.org/showthread.php?t=2010223 my research group and have run into a snag. I bit of history, the server was first built at the beginning of December, by a student who was leaving the group. I inherited the box with a fresh install error 4 of Centos 6.3 that had not even been booted for first use. I do not have the full specs of the machine with me as I am at home right now, but off the top of my head it is a new i5 with 32 GB ram using the internal Intel graphics of the i5. The system was installed on a 1.5 TB drive with a secondary 2TB data drive. About 3 weeks ago our building had a power error 4 in spike that may have affected the machine. The issues started showing up when a user could not mount and NFS share he uses (logging in via ssh in case it matters). I logged in directly and noticed several gnome applets crashing due to signal 11. Disk utility reported that the system drive had 27 bad sectors, but running bad blocks in the terminal did not report any issues. After a bit of searching and trying to repair the disk, I did a fresh install on a new disk and everything ran fine for 4 day ( 2 of them were the weekend while no one was in the office) then started getting the signal 11 errors again. I figured the power spike must have damaged the mobo or cpu, so I do a fresh install on yet another drive in a whole new system. This one is a mac pro with dual xenon 6 core processors and 62 GB of ram (my professor wants me to convert 3 more of these beasts and cluster if we can get them working). This system works for about 2 days before getting the signal 11 errors. For this latest build I took a look in /var/log/messages and found thisFeb 20 14:04:25 modeler kernel: wnck-applet[10443]: segfault at 3c00000000 ip 0000003c25128190 sp 00007fff9c721688 error 4 in libc-2.12.so[3c25000000+189000]Feb 20 14:04:26 modeler rtkit-daemon[10184]: Sucessfully made thread 10645 of process 10645 (/u
Get Kubuntu Get Xubuntu Get Lubuntu Get UbuntuStudio Get Mythbuntu Get Edubuntu Get Ubuntu-GNOME Get UbuntuKylin Ubuntu Code of Conduct Ubuntu Wiki Community Wiki Other Support Launchpad Answers Ubuntu IRC Support AskUbuntu Official Documentation User Documentation Social Media Facebook Twitter Useful Links Distrowatch Bugs: Ubuntu PPAs: Ubuntu Web Upd8: Ubuntu OMG! Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Official Flavours Support General Help [SOLVED] segfaults in some applications, leaving a libc error in dmesg Having an Issue With Posting ? Do you want to help us debug the posting issues ? < is the place to report it, thanks ! Results 1 to 5 of 5 Thread: segfaults in some applications, leaving a libc error in dmesg Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode June 25th, 2012 #1 hkzlab View Profile View Forum Posts Private Message First Cup of Ubuntu Join Date Jun 2012 Beans 4 segfaults in some applications, leaving a libc error in dmesg Hello everyone, I'm a bit lost on this one, never got something like this in my years of linux experience. Yesterday evening I updated all the packages on my desktop pc (Ubuntu 12.04, amd64, core 2 duo processor) as it was behind a few weeks. Apparently everything went well, the PC powered down fine after I finished. But when I turned it on today I got a nasty surprise: a lot of applications die with a segfault, leaving an error like this in dmesg: Code: [ 185.594356] gimp[3167]: segfault at 7f7c6bc59bf0 ip 00007f7b98eb8fd8 sp 00007fff43d601e8 error 4 in libc-2.15.so[7f7b98d7d000+1b3000] That one is gimp, but I get similar errors with compiz and evolution (the common thing is error 4, libc-2.15.so and the memory offset of 7f7b98d7d000+1b3000). Here is what i tried: Thinking that libc-2.15.so might have gotten corrupt, I reinstalled the libc6 and libc-bin packages directly from the deb files, that didn't helpsuspecting a filesystem corruption, I forced a fsck on boot (/forcefsck). That didn't find anything.suspecting a RAM problem, I ran memtest86 fo