I have an Ubuntu 16.04 VM running in Virtualbox. I'm building kernel from git using make deb-pkg. After I install all the deb packages (including debug symbols) on the VM and restart it, I can see in uname -r output that the appropriate kernel was booted from. I'm passing the following parameters to the kernel:
kgdboc=ttyS0,115200 kgdbwait
Once the kernel boots, I am able to connect to it via socat + gdb from host. I'm using the full uncompressed vmlinux file to start the gdb which contains all the debugging symbols. However, I can't see any of the symbols in backtrace etc.
$ du -sh vmlinux 425M vmlinux $ gdb vmlinux GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.04) 7.11.1 Copyright (C) 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later [gnu.org] [...] For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux...done. (gdb) target remote /dev/pts/2 Remote debugging using /dev/pts/2 0xffffffffb113c5b4 in ?? () (gdb) bt #0 0xffffffffb113c5b4 in ?? () #1 0xffffb035421c7dd0 in ?? () #2 0xffffffffb113c60c in ?? () #3 0xffffb035421c7e00 in ?? () #4 0xffffffffb153035a in ?? () #5 0x0000000000000002 in irq_stack_union () #6 0x00000000013a7408 in ?? () #7 0xffff8fb8bd0d3b00 in ?? () #8 0xffffb035421c7e18 in ?? () #9 0xffffffffb15307df in ?? () #10 0xffff8fb8b8779900 in ?? () #11 0xffffb035421c7e38 in ?? () #12 0xffffffffb12ab412 in ?? () #13 0xffff8fb8bd0d3b00 in ?? ()
Any ideas what am I doing wrong? Thanks, Kamran.