Linux Kernel Segfault Error Codes
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Post #1 of 8 (4064 views) Permalink x86_64 segfault error linux segfault error 6 codes For segfault error codes on x86_64, bits 0-3
Segfault Error 4
are documented in arch/x86_64/mm/fault.c. However, I am getting error 0x14 and 0x15 with this particular segfault at 0 ip sp error 4 user app when it segfaults. Is bit 4 valid and what does that imply? xxx-001[2085]: segfault at 0000007f960ea86b rip 0000007f960ea86b rsp 0000007fbfffe968 error segfault error 14 14 xxx-001[2091]: segfault at 0000007fbfffe670 rip 0000007fbfffe670 rsp 0000007fbfffe668 error 15 -- -= Dave =- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo [at] vger More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ ak at suse
Segfault Error 15
Dec14,2005,10:31AM Post #2 of 8 (4031 views) Permalink Re: x86_64 segfault error codes [In reply to] Dave
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Segfault At Rip Rsp Error 6
helping each other. Join them; it only takes a minute: Sign up What are the possible causes for the segfault error codes up vote 1 down vote favorite I encounter a segfault issue recently, it is hit http://www.gossamer-threads.com/lists/linux/kernel/598127 when invoking the delete method. I have examined the code in depth and eliminate the possibility of deleting a null pointer, or multiple deletes, or out-of-bound(The memory allocated is large enough to hold the content that is written to it afterward). This issue can be reproduced, each time it segfaults in the same place. I am running out of idea what may cause this issue. I wonder whether it is possible to get some clues from http://stackoverflow.com/questions/13666889/what-are-the-possible-causes-for-the-segfault-error-codes the error code I get, such as:- segfault at xxxxxxxxxxxxxx rip xxxxxxxxxxxxxx rsp xxxxxxxxxxxxxx error 4 I search over the net for quite a long time, only get the useful following info from stackoverflow:- "The error code is just the architectural error code for page faults and seems to be architecture specific. They are often documented in arch/*/mm/fault.c in the kernel source. My copy of Linux/arch/i386/mm/fault.c has the following definition for error_code: bit 0 == 0 means no page found, 1 means protection fault bit 1 == 0 means read, 1 means write bit 2 == 0 means kernel, 1 means user-mode " Here is my question:- What is the possible causes of error code 4(My platform is RHEL5 64bit, x86_64)? Is there any way to tell the possible causes from the error code? Any other advice about how to diagnose this kind of issue is also appreciated! c++ linux memory segmentation-fault share|improve this question edited Dec 2 '12 at 13:02 asked Dec 2 '12 at 6:11 user1137890 4719 2 Run your program under valgrind. –David Schwartz Dec 2 '12 at 6:15 Deleting a null pointer isn't a problem. –ldav1s Dec 2 '12 at 6:17 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote Given the documentation from arch/i386/mm/fault.c that you supply, an error code of 4
virtual pids in /proc" In reply to: Andi Kleen: "Re: x86_64 segfault error codes" Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] FWIW I converted the magic http://lkml.iu.edu/hypermail/linux/kernel/0512.1/2406.html numbers now to defines in the source and deleted the comment (since kernel source is no replacement for an architecture manual) -Andi Review welcome. I think I didn't do any mistakes though and the result at least boots. Convert page fault error codes to symbolic constants. Much better to deal with these than with the magic numbers. And remove the comment describing the bits - kernel segfault error source is no replacement for an architecture manual. Signed-off-by: Andi Kleen