sound/core/init.o: warning: objtool: snd_disconnect_release()+0xac: unreachable instruction

Thursday, 10 September 2020

CC: linux-kernel(a)vger.kernel.org
TO: Kees Cook <keescook(a)chromium.org&gt;
CC: Andrew Morton <akpm(a)linux-foundation.org&gt;
CC: Linux Memory Management List <linux-mm(a)kvack.org&gt;

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   34d4ddd359dbcdf6c5fb3f85a179243d7a1cb7f8
commit: 0887a7ebc97770c7870abf3075a2e8cd502a7f52 ubsan: add trap instrumentation option
date:   5 months ago
config: x86_64-randconfig-r022-20200909 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project
8893d0816ccdf8998d2e21b5430e9d6abe7ef465)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        git checkout 0887a7ebc97770c7870abf3075a2e8cd502a7f52
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

All warnings (new ones prefixed by >>):

...
> sound/core/init.o: warning: objtool:
snd_disconnect_release()+0xac: unreachable instruction --
...
> drivers/char/ipmi/ipmi_watchdog.o: warning: objtool:
ipmi_wdog_pretimeout_handler()+0x5f: unreachable instruction --
...
> drivers/tty/vt/vc_screen.o: warning: objtool: vcs_init()+0xbc:
unreachable instruction --
...
> drivers/watchdog/pretimeout_panic.o: warning: objtool:
pretimeout_panic()+0x18: unreachable instruction --
...
> kernel/reboot.o: warning: objtool: __se_sys_reboot()+0x236:
unreachable instruction --
...
> certs/system_keyring.o: warning: objtool:
system_trusted_keyring_init()+0x90: unreachable instruction --
...
> arch/x86/mm/pat/memtype.o: warning: objtool: pat_ap_init()+0x7d:
unreachable instruction --
...
> kernel/rcu/tree.o: warning: objtool: panic_on_rcu_stall()+0x22:
unreachable instruction --
...
> fs/aio.o: warning: objtool: aio_setup()+0x80: unreachable
instruction --
...
> fs/nfs/nfs4state.o: warning: objtool:
nfs4_run_state_manager()+0x31: unreachable instruction --
...
> fs/nfs/callback.o: warning: objtool: nfs4_callback_svc()+0xb5:
unreachable instruction ..

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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