debuging kernel doesn't start: invalid `Elf' handle about drgn HOT 5 CLOSED

Could you provide the output of running sudo strace drgn -k? Hopefully I can figure out which file failed from that.

Some other general information that would be appreciated:

• What distro and distro version is this on?
• What version of elftutils do you have installed? eu-readelf --version should give you that unless you did anything special to get the elfutils libraries.

from drgn.

• Arch Linux
• eu-readelf (elfutils) 0.176
• strace: https://gist.github.com/Nudin/37459465d89db7ef21dc1f217519d752

from drgn.

Ah, it looks like you're trying to debug the official Arch kernel, but Arch doesn't ship debugging information. Unfortunately, the only way to get debugging information on Arch is to build the kernel yourself with CONFIG_DEBUG_INFO=y. However, drgn should definitely be giving you a better error message here. I can reproduce the issue here, so I'll fix that.

from drgn.

Makes total sense! Adding a proper error message sounds the right way! Thanks for the quick help.

from drgn.

This is fixed by the larger rework in 423d2cd:

$ sudo drgn -k
could not get debugging information for:
/usr/lib/modules/5.3.1-arch1-1-ARCH/kernel/drivers/input/serio/serio.ko.xz (libdwfl error: No DWARF information found)
/usr/lib/modules/5.3.1-arch1-1-ARCH/kernel/drivers/input/serio/i8042.ko.xz (libdwfl error: No DWARF information found)
/usr/lib/modules/5.3.1-arch1-1-ARCH/kernel/drivers/net/net_failover.ko.xz (libdwfl error: No DWARF information found)
/usr/lib/modules/5.3.1-arch1-1-ARCH/kernel/drivers/net/virtio_net.ko.xz (libdwfl error: No DWARF information found)
/usr/lib/modules/5.3.1-arch1-1-ARCH/kernel/drivers/macintosh/mac_hid.ko.xz (libdwfl error: No DWARF information found)
... 40 more

Thanks for reporting this!

from drgn.