This is happening only with kernel 4.8+. When I compile kernel 4.4 with a stock Ubuntu Xenial .config, symbols appear just fine. When I compile kernel 4.8/4.10 with Yakkety/Zesty stock configs the symbols disappear. On Wed, Jun 14, 2017 at 4:58 PM, Kamran Khan <krkhan@xxxxxxxxxxxxxx> wrote: > 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. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
