Kernel Error 6 Segfault
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Segfault At Rip Rsp Error 6
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Segfault Error Codes
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 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 segfault error 14 '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 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
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() calls here and there,
Dmesg Segfault Error 4
have a look at the output of the Linux kernel: $ dmesg foo[1234]: segfault segfault error 15 at 2a ip 0000000000400511 sp 00007fffe00a3260 error 4 in foo[400000+1000] These are some hints in dmesg output: foo is the executable the cause was a user-mode write resulting in no page being found. 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 pointer error 4 is an error code http://stackoverflow.com/questions/2549214/interpreting-segfault-messages 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 * bit 2 == 0: kernel-mode access 1: user-mode access * http://www.enodev.fr/posts/decode-segfault-errors-in-dmesg.html 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
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