linux-kernel - Re: vmlinux.o: warning: objtool: snd_rme96_capture_getrate+0x84: return with modified stack frame

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Message-ID: <lmqrapilznvh5eb77umjvcbfu6sakjnwxxv4ksdkhykf7pavtm@rhe42usyouz7>
Date: Tue, 18 Mar 2025 23:58:00 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: vmlinux.o: warning: objtool: snd_rme96_capture_getrate+0x84:
 return with modified stack frame

On Mon, Mar 17, 2025 at 03:36:46PM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   4701f33a10702d5fc577c32434eb62adde0a1ae1
> commit: 3724062ca2b1364f02cf44dbea1a552227844ad1 objtool: Ignore dangling jump table entries
> date:   5 weeks ago
> config: x86_64-randconfig-r051-20250316 (https://download.01.org/0day-ci/archive/20250317/202503171547.LlCTJLQL-lkp@intel.com/config)
> compiler: clang version 20.1.0 (https://github.com/llvm/llvm-project 24a30daaa559829ad079f2ff7f73eb4e18095f88)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250317/202503171547.LlCTJLQL-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202503171547.LlCTJLQL-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):

LTO+UBSAN fun.

>    vmlinux.o: warning: objtool: SiS_GetCRT2Ptr+0x1ad: stack state mismatch: cfa1=4+8 cfa2=5+16
>    vmlinux.o: warning: objtool: .text.nvmet_ctrl_state_show: unexpected end of section
>    vmlinux.o: warning: objtool: .text.cyapa_update_fw_store: unexpected end of section

I have fixes for these, will post soon.

>    vmlinux.o: warning: objtool: ___bpf_prog_run+0x1f: sibling call from callable instruction with modified stack frame
> >> vmlinux.o: warning: objtool: snd_rme96_capture_getrate+0x84: return with modified stack frame
> >> vmlinux.o: warning: objtool: .text.wcd934x_slim_irq_handler: unexpected end of section

Haven't been able to recreate these yet, will try clang 20.

-- 
Josh