On Tue, Dec 10, 2024 at 02:55:01PM +0100, Laura Nao wrote: > 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. I managed to reproduce finally with gcc-12, but had to use pahole 1.25, 1.24 failed with unknown attribute [95096] VAR 'rcu_data' type_id=94868, linkage=static [95098] VAR 'rcu_data' type_id=4, linkage=static type_id=95096 offset=177088 size=1152 (VAR 'rcu_data') type_id=95098 offset=177088 size=1152 (VAR 'rcu_data') will try to check what's going on jirka
