Hi Jiri, Thanks for the feedback! On 12/6/24 13:35, Jiri Olsa wrote: > On Fri, Nov 15, 2024 at 06:17:12PM +0100, Laura Nao wrote: >> On 11/13/24 10:37, Laura Nao wrote: >>> >>> Currently, KernelCI only retains the bzImage, not the vmlinux >>> binary. The >>> bzImage can be downloaded from the same link mentioned above by >>> selecting >>> 'kernel' from the dropdown menu (modules can also be downloaded the >>> same >>> way). I’ll try to replicate the build on my end and share the >>> vmlinux >>> with DWARF data stripped for convenience. >>> >> >> I managed to reproduce the issue locally and I've uploaded the >> vmlinux[1] >> (stripped of DWARF data) and vmlinux.raw[2] files, as well as one of >> the >> modules[3] and its btf data[4] extracted with: >> >> bpftool -B vmlinux btf dump file cros_kbd_led_backlight.ko > >> cros_kbd_led_backlight.ko.raw >> >> Looking again at the logs[5], I've noticed the following is reported: >> >> [ 0.415885] BPF: type_id=115803 offset=177920 size=1152 >> [ 0.416029] BPF: >> [ 0.416083] BPF: Invalid offset >> [ 0.416165] BPF: >> >> There are two different definitions of rcu_data in '.data..percpu', >> one >> is a struct and the other is an integer: >> >> type_id=115801 offset=177920 size=1152 (VAR 'rcu_data') >> type_id=115803 offset=177920 size=1152 (VAR 'rcu_data') >> >> [115801] VAR 'rcu_data' type_id=115572, linkage=static >> [115803] VAR 'rcu_data' type_id=1, linkage=static >> >> [115572] STRUCT 'rcu_data' size=1152 vlen=69 >> [1] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 >> encoding=(none) >> >> I assume that's not expected, correct? > > yes, that seems wrong.. but I can't reproduce with your config > together with pahole 1.24 .. could you try with latest one? I just tested next-20241210 with the latest pahole version (1.28 from the master branch[1]), and the issue does not occur with this version (I can see only one instance of rcu_data in the BTF data, as expected). I can confirm that the same kernel revision still exhibits the issue with pahole 1.24. If helpful, I can also test versions between 1.24 and 1.28 to identify which ones work. Thanks, Laura [1] https://git.kernel.org/pub/scm/devel/pahole/pahole.git > > jirka > >> >> I'll dig a bit deeper and report back if I can find anything else. >> >> [1] >> https://people.collabora.com/~laura.nao/dbg-btf-mismatch-next-20241113/vmlinux >> [2] >> https://people.collabora.com/~laura.nao/dbg-btf-mismatch-next-20241113/vmlinux.raw >> [3] >> https://people.collabora.com/~laura.nao/dbg-btf-mismatch-next-20241113/cros_kbd_led_backlight.ko >> [4] >> https://people.collabora.com/~laura.nao/dbg-btf-mismatch-next-20241113/cros_kbd_led_backlight.ko.raw >> [5] https://pastebin.com/raw/FvvrPhAY >> >> Best, >> >> Laura >>
