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Date: Mon, 2 May 2022 11:15:14 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: kernel test robot <lkp@...el.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
x86@...nel.org, Borislav Petkov <bp@...e.de>,
Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [tip:master 18/29] fs/ntfs3/ntfs3.prelink.o: warning: objtool:
ni_read_frame() falls through to next function ni_readpage_cmpr.cold()
On Mon, May 02, 2022 at 10:34:28AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git master
> head: aea1ae1ab93e60b266453b008238fbc5f0c65865
> commit: ad0952ac67d1bd2c1e0c25ce150b981f02cc23a3 [18/29] Merge objtool/core into tip/master
> config: x86_64-randconfig-c001-20220502 (https://download.01.org/0day-ci/archive/20220502/202205021021.6sless1W-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
> reproduce (this is a W=1 build):
> # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=ad0952ac67d1bd2c1e0c25ce150b981f02cc23a3
> git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> git fetch --no-tags tip master
> git checkout ad0952ac67d1bd2c1e0c25ce150b981f02cc23a3
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> fs/ntfs3/ntfs3.prelink.o: warning: objtool: ni_read_frame() falls through to next function ni_readpage_cmpr.cold()
That is in fact:
000000000000124a <ni_read_frame.cold>:
124a: 44 89 e0 mov %r12d,%eax
124d: 0f b6 55 98 movzbl -0x68(%rbp),%edx
1251: 48 c7 c7 00 00 00 00 mov $0x0,%rdi 1254: R_X86_64_32S .data+0x1380
1258: 48 89 c6 mov %rax,%rsi
125b: e8 00 00 00 00 call 1260 <ni_read_frame.cold+0x16> 125c: R_X86_64_PLT32 __ubsan_handle_shift_out_of_bounds-0x4
1260: 48 8d 7d cc lea -0x34(%rbp),%rdi
1264: e8 00 00 00 00 call 1269 <ni_read_frame.cold+0x1f> 1265: R_X86_64_PLT32 __tsan_read4-0x4
1269: 8b 45 cc mov -0x34(%rbp),%eax
126c: e9 00 00 00 00 jmp 1271 <ni_read_frame.cold+0x27> 126d: R_X86_64_PC32 .text+0x19109
1271: 48 8b 75 a0 mov -0x60(%rbp),%rsi
1275: 48 63 d0 movslq %eax,%rdx
1278: 48 c7 c7 00 00 00 00 mov $0x0,%rdi 127b: R_X86_64_32S .data+0x13a0
127f: 89 45 88 mov %eax,-0x78(%rbp)
1282: e8 00 00 00 00 call 1287 <ni_read_frame.cold+0x3d> 1283: R_X86_64_PLT32 __ubsan_handle_shift_out_of_bounds-0x4
1287: 8b 45 88 mov -0x78(%rbp),%eax
128a: e9 00 00 00 00 jmp 128f <ni_read_frame.cold+0x45> 128b: R_X86_64_PC32 .text+0x19098
128f: 48 c7 c7 00 00 00 00 mov $0x0,%rdi 1292: R_X86_64_32S .data+0x11f0
1296: e8 00 00 00 00 call 129b <ni_readpage_cmpr.cold> 1297: R_X86_64_PLT32 __ubsan_handle_builtin_unreachable-0x4
000000000000129b <ni_readpage_cmpr.cold>:
The below seems to fix.
---
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2063f9fea1a2..d5189f5ec69e 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -185,6 +185,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"stop_this_cpu",
"__invalid_creds",
"cpu_startup_entry",
+ "__ubsan_handle_builtin_unreachable",
};
if (!func)
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