Re: [GIT PULL] ftrace: Updates for 6.15

[Leon Romanovsky]

On Mon, Mar 31, 2025 at 04:57:53PM +0000, Christian Loehle wrote:
> 
> 
> ________________________________________
> From: pr-tracker-bot@xxxxxxxxxx <pr-tracker-bot@xxxxxxxxxx>
> Sent: 28 March 2025 00:09
> To: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx>; Masami Hiramatsu <mhiramat@xxxxxxxxxx>; Mark Rutland <Mark.Rutland@xxxxxxx>; Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>; Haiyue Wang <haiyuewa@xxxxxxx>; Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>; Sasha Levin <sashal@xxxxxxxxxx>; Sven Schnelle <svens@xxxxxxxxxxxxx>; Tengda Wu <wutengda@xxxxxxxxxxxxxxx>
> Subject: Re: [GIT PULL] ftrace: Updates for 6.15
>  
>  
> >The pull request you sent on Tue, 25 Mar 2025 19:39:35 -0400:
> >
> >> git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git ftrace-v6.15
> >
> >has been merged into torvalds/linux.git:
> >https://git.kernel.org/torvalds/c/31eb415bf6f06c90fdd9b635caf3a6c5110a38b6
> >
> >Thank you!
> >
> >--
> >Deet-doot-dot, I am a bot.
> >https://korg.docs.kernel.org/prtracker.html
> 
> Hi Steven,
> I'm pretty sure this causes the build to fail on linus' tree and next:
> 4e82c87058f4 (HEAD -> master, origin/master, origin/HEAD) Merge tag 'rust-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux
> 
> aarch64-linux-gnu-ld: Unexpected GOT/PLT entries detected!
> aarch64-linux-gnu-ld: Unexpected run-time procedure linkages detected!
> aarch64-linux-gnu-ld: kernel/trace/trace_output.o: in function `print_function_args':
> /home/chrloe01/development/linux-mainline/kernel/trace/trace_output.c:712: undefined reference to `btf_find_func_proto'
> aarch64-linux-gnu-ld: /home/chrloe01/development/linux-mainline/kernel/trace/trace_output.c:716: undefined reference to `btf_get_func_param'
> make[2]: *** [scripts/Makefile.vmlinux:77: vmlinux] Error 1
> make[1]: *** [/data_nvme1n1/chrloe01/development/linux-mainline/Makefile:1234: vmlinux] Error 2
> make: *** [Makefile:251: __sub-make] Error 2

We see same issue in our CI systems.

13:29:09  + make -s -j64 ARCH=x86
13:32:31  ld: kernel/trace/trace_output.o: in function `print_function_args':
13:32:31  /home/jenkins/agent/workspace/kernel_build/linux/kernel/trace/trace_output.c:713:(.text+0x20f1): undefined reference to `btf_find_func_proto'
13:32:31  ld: /home/jenkins/agent/workspace/kernel_build/linux/kernel/trace/trace_output.c:717:(.text+0x210d): undefined reference to `btf_get_func_param'
13:32:31  make[2]: *** [scripts/Makefile.vmlinux:77: vmlinux] Error 1
13:32:31  make[1]: *** [/home/jenkins/agent/workspace/kernel_build/linux/Makefile:1234: vmlinux] Error 2
13:32:31  make: *** [Makefile:251: __sub-make] Error 2

Thanks

> 
> Sound familiar?
> grep BTF .config
> CONFIG_DEBUG_INFO_BTF=y
> CONFIG_PAHOLE_HAS_SPLIT_BTF=y
> CONFIG_DEBUG_INFO_BTF_MODULES=y
> # CONFIG_MODULE_ALLOW_BTF_MISMATCH is not set
> 
> Enabling CONFIG_PROBE_EVENTS_BTF_ARGS passes the build.
> 
>