Linux Segfault Error 4
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Segfault At 0 Ip Sp Error 4
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Segfault Error Codes
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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() calls segfault error 15 here and there, have a look at the output of the Linux kernel: $ dmesg segfault error 4 dmesg foo[1234]: segfault at 2a ip 0000000000400511 sp 00007fffe00a3260 error 4 in foo[400000+1000] These are some hints in dmesg output: foo
The Cause Was A User-mode Read Resulting In No Page Being Found.
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 pointer error 4 https://community.hpe.com/t5/System-Administration/LINUX-segfault-error-4/td-p/5173582 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 * bit 2 == http://www.enodev.fr/posts/decode-segfault-errors-in-dmesg.html 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
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