Linux Kernel Segfault Error
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Segfault At 0 Ip Sp Error 4
more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack kernel segfault at rip rsp error 4 Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, segfault error 6 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 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
Segfault At Rip Rsp Error 6
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 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
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Segfault Error 15
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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 or adding printf() http://www.enodev.fr/posts/decode-segfault-errors-in-dmesg.html calls here and there, have a look at the output of the Linux http://serverfault.com/questions/243579/how-to-diagnose-frequent-segfaults kernel: $ dmesg foo[1234]: segfault at 2a ip 0000000000400511 sp 00007fffe00a3260 error 4 in foo[400000+1000] These 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 value after sp is the stack segfault error 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 * bit 1 == 0: read access 1: write access kernel segfault error * 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
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta 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 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. 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: