Comment 0 for bug 1675949

Running zesty 4.10.0-13-generic kernel and running:
$ perf record

followed by

$ perf report

results in output that can't be annotated (even when run as root). The following message appears:
Couldn't annotate do_io_submit:
No vmlinux file with build id 81ba79d482fa9e3ea58486de8f119b27fe6db55e
was found in the path.

Note that annotation using /proc/kcore requires CAP_SYS_RAWIO capability.

Please use:

perf buildid-cache -vu vmlinux

Note this is being run as root and /proc/kcore is accessible with dd from the same shell:
$ dd if=/proc/kcore bs=8 count=16 | hexdump
0000000 457f 464c 0102 0001 0000 0000 0000 0000
0000010 0004 00b7 0001 0000 0000 0000 0000 0000
0000020 0040 0000 0000 0000 0000 0000 0000 0000
0000030 0000 0000 0040 0038 0003 0000 0000 0000
0000040 0004 0000 0000 0000 00e8 0000 0000 0000

Additionally, installing the linux-image-4.10.0-13-generic-dbgsym actually hurts the situation because the symbol addresses in the dbgsym don't match the kernel addresses.