No stacktrace from core dump, no build id can be extracted from the core either












0














I have an application in production that in very unpredictable intervals (sometimes less than once a week, rarely once an hour) produces segfaults.
After first having to set it up to produce core dumps at all, I now have one. However I get no symbols at all, so it's useless.



I tried to compare build-ids with the executable that produced it, even though based on timing I pretty much am certain I have the right one, but even that cannot be extracted it seems.



$ eu-unstrip -n --core /path/to/core
0x7ffd56d9e000+0x1000 a6c873a47c39e0b4c46a8e56aace0675e6d58d33@0x7ffd56d9e7d0 . - linux-vdso.so.1


Which appears to not be the id of the [exe] I saw in examples of this.



Is there anything I can do beyond loading gdb, doing symbol-file /path/to/my/binary and having to accept that this core dump is useless to me?



EDIT:



gdb -ex where produces what looks like a stacktrace. How is that different from running symbol-file ?



I have a few libs that I include as a source files, the rest is dynamically linked.



there is a build id in the exe according to read elf.










share|improve this question
























  • What is the output from: gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it have BUILD_ID note in readelf -n /path/to/exe ?
    – Employed Russian
    Nov 22 '18 at 3:41










  • See my EDIT above. Seems that -ex where option seems to do something more useful.
    – Cola_Colin
    Nov 23 '18 at 13:22
















0














I have an application in production that in very unpredictable intervals (sometimes less than once a week, rarely once an hour) produces segfaults.
After first having to set it up to produce core dumps at all, I now have one. However I get no symbols at all, so it's useless.



I tried to compare build-ids with the executable that produced it, even though based on timing I pretty much am certain I have the right one, but even that cannot be extracted it seems.



$ eu-unstrip -n --core /path/to/core
0x7ffd56d9e000+0x1000 a6c873a47c39e0b4c46a8e56aace0675e6d58d33@0x7ffd56d9e7d0 . - linux-vdso.so.1


Which appears to not be the id of the [exe] I saw in examples of this.



Is there anything I can do beyond loading gdb, doing symbol-file /path/to/my/binary and having to accept that this core dump is useless to me?



EDIT:



gdb -ex where produces what looks like a stacktrace. How is that different from running symbol-file ?



I have a few libs that I include as a source files, the rest is dynamically linked.



there is a build id in the exe according to read elf.










share|improve this question
























  • What is the output from: gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it have BUILD_ID note in readelf -n /path/to/exe ?
    – Employed Russian
    Nov 22 '18 at 3:41










  • See my EDIT above. Seems that -ex where option seems to do something more useful.
    – Cola_Colin
    Nov 23 '18 at 13:22














0












0








0







I have an application in production that in very unpredictable intervals (sometimes less than once a week, rarely once an hour) produces segfaults.
After first having to set it up to produce core dumps at all, I now have one. However I get no symbols at all, so it's useless.



I tried to compare build-ids with the executable that produced it, even though based on timing I pretty much am certain I have the right one, but even that cannot be extracted it seems.



$ eu-unstrip -n --core /path/to/core
0x7ffd56d9e000+0x1000 a6c873a47c39e0b4c46a8e56aace0675e6d58d33@0x7ffd56d9e7d0 . - linux-vdso.so.1


Which appears to not be the id of the [exe] I saw in examples of this.



Is there anything I can do beyond loading gdb, doing symbol-file /path/to/my/binary and having to accept that this core dump is useless to me?



EDIT:



gdb -ex where produces what looks like a stacktrace. How is that different from running symbol-file ?



I have a few libs that I include as a source files, the rest is dynamically linked.



there is a build id in the exe according to read elf.










share|improve this question















I have an application in production that in very unpredictable intervals (sometimes less than once a week, rarely once an hour) produces segfaults.
After first having to set it up to produce core dumps at all, I now have one. However I get no symbols at all, so it's useless.



I tried to compare build-ids with the executable that produced it, even though based on timing I pretty much am certain I have the right one, but even that cannot be extracted it seems.



$ eu-unstrip -n --core /path/to/core
0x7ffd56d9e000+0x1000 a6c873a47c39e0b4c46a8e56aace0675e6d58d33@0x7ffd56d9e7d0 . - linux-vdso.so.1


Which appears to not be the id of the [exe] I saw in examples of this.



Is there anything I can do beyond loading gdb, doing symbol-file /path/to/my/binary and having to accept that this core dump is useless to me?



EDIT:



gdb -ex where produces what looks like a stacktrace. How is that different from running symbol-file ?



I have a few libs that I include as a source files, the rest is dynamically linked.



there is a build id in the exe according to read elf.







c++ linux gdb coredump






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 23 '18 at 13:22







Cola_Colin

















asked Nov 19 '18 at 21:05









Cola_ColinCola_Colin

91211




91211












  • What is the output from: gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it have BUILD_ID note in readelf -n /path/to/exe ?
    – Employed Russian
    Nov 22 '18 at 3:41










  • See my EDIT above. Seems that -ex where option seems to do something more useful.
    – Cola_Colin
    Nov 23 '18 at 13:22


















  • What is the output from: gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it have BUILD_ID note in readelf -n /path/to/exe ?
    – Employed Russian
    Nov 22 '18 at 3:41










  • See my EDIT above. Seems that -ex where option seems to do something more useful.
    – Cola_Colin
    Nov 23 '18 at 13:22
















What is the output from: gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it have BUILD_ID note in readelf -n /path/to/exe ?
– Employed Russian
Nov 22 '18 at 3:41




What is the output from: gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it have BUILD_ID note in readelf -n /path/to/exe ?
– Employed Russian
Nov 22 '18 at 3:41












See my EDIT above. Seems that -ex where option seems to do something more useful.
– Cola_Colin
Nov 23 '18 at 13:22




See my EDIT above. Seems that -ex where option seems to do something more useful.
– Cola_Colin
Nov 23 '18 at 13:22












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