Em Wed, Dec 30, 2020 at 02:28:52PM +0100, Jiri Olsa escreveu: > On Wed, Dec 30, 2020 at 02:28:02PM +0100, Jiri Olsa wrote: > > On Wed, Dec 30, 2020 at 10:03:37AM +0100, Jiri Olsa wrote: > > > On Tue, Dec 29, 2020 at 11:28:35PM +0000, Qais Yousef wrote: > > > > Hi Jiri > > > > > > > > On 12/29/20 18:34, Jiri Olsa wrote: > > > > > On Tue, Dec 29, 2020 at 03:13:52PM +0000, Qais Yousef wrote: > > > > > > Hi > > > > > > > > > > > > When I enable CONFIG_DEBUG_INFO_BTF I get the following error in > > > > > > the BTFIDS > > > > > > stage > > > > > > > > > > > > FAILED unresolved symbol udp6_sock > > > > > > > > > > > > I cross compile for arm64. My .config is attached. > > > > > > > > > > > > I managed to reproduce the problem on v5.9 and v5.10. Plus 5.11-rc1. > > > > > > > > > > > > Have you seen this before? I couldn't find a specific report about > > > > > > this > > > > > > problem. > > > > > > > > > > > > Let me know if you need more info. > > > > > > > > > > hi, > > > > > this looks like symptom of the gcc DWARF bug we were > > > > > dealing with recently: > > > > > > > > > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97060 > > > > > > > > > > https://lore.kernel.org/lkml/CAE1WUT75gu9G62Q9uAALGN6vLX=o7vz9uhqtvwnbuv81dgm...@mail.gmail.com/#r > > > > > > > > > > what pahole/gcc version are you using? > > > > > > > > I'm on gcc 9.3.0 > > > > > > > > aarch64-linux-gnu-gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 > > > > > > > > I was on pahole v1.17. I moved to v1.19 but I still see the same > > > > problem.
There are some changes post v1.19 in the git repo: [acme@five pahole]$ git log --oneline v1.19.. b688e35970600c15 (HEAD -> master) btf_encoder: fix skipping per-CPU variables at offset 0 8c009d6ce762dfc9 btf_encoder: fix BTF variable generation for kernel modules b94e97e015a94e6b dwarves: Fix compilation on 32-bit architectures 17df51c700248f02 btf_encoder: Detect kernel module ftrace addresses 06ca639505fc56c6 btf_encoder: Use address size based on ELF's class aff60970d16b909e btf_encoder: Factor filter_functions function 1e6a3fed6e52d365 (quaco/master) rpm: Fix changelog date [acme@five pahole]$ But I think these won't matter in this case :-\ - Arnaldo > > > I can reproduce with your .config, but make 'defconfig' works, > > > so I guess it's some config option issue, I'll check later today > > > > so your .config has > > CONFIG_CRYPTO_DEV_BCM_SPU=y > > > > and that defines 'struct device_private' which > > clashes with the same struct defined in drivers/base/base.h > > > > so several networking structs will be doubled, like net_device: > > > > $ bpftool btf dump file ../vmlinux.config | grep net_device\' | grep > > STRUCT > > [2731] STRUCT 'net_device' size=2240 vlen=133 > > [113981] STRUCT 'net_device' size=2240 vlen=133 > > > > each is using different 'struct device_private' when it's unwinded > > > > and that will confuse BTFIDS logic, becase we have multiple structs > > with the same name, and we can't be sure which one to pick > > > > perhaps we should check on this in pahole and warn earlier with > > better error message.. I'll check, but I'm not sure if pahole can > > survive another hastab ;-) > > > > Andrii, any ideas on this? ;-) > > > > easy fix is the patch below that renames the bcm's structs, > > it makes the kernel to compile.. but of course the new name > > is probably wrong and we should push this through that code > > authors > > also another quick fix is to switch it to module > > jirka > -- - Arnaldo
