Mixing
No stacktrace from core dump, no build id can be extracted from the core either
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
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
add a comment |
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
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
What is the output from:gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it haveBUILD_IDnote inreadelf -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
add a comment |
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
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
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
c++ linux gdb coredump
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
edited Nov 23 '18 at 13:22
Cola_Colin
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
asked Nov 19 '18 at 21:05
Cola_ColinCola_Colin
91211
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 haveBUILD_IDnote inreadelf -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
add a comment |
What is the output from:gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it haveBUILD_IDnote inreadelf -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
add a comment |
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What is the output from:
gdb -ex where /path/to/exe /path/to/core? Also, is your application statically linked? Does it haveBUILD_IDnote inreadelf -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