Hi Sebastian, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.4.y-rt head: 5fbf1e70f11dba64cc05c9d85120a3aa7c67a4a2 commit: 95c50e7fcaa1ebe6e9f8c98b385dcc10653781e9 [213/325] x86: Allow to enable RT config: x86_64-randconfig-r011-20201210 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/com... git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git git fetch --no-tags linux-rt-devel linux-5.4.y-rt git checkout 95c50e7fcaa1ebe6e9f8c98b385dcc10653781e9 # save the attached .config to linux build tree make W=1 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 >>): 162 | void _local_bh_enable_rt(void) | ^~~~~~~~~~~~~~~~~~~ -- kernel/time/hrtimer.c:120:21: warning: initialized field overwritten [-Woverride-init] 120 | [CLOCK_REALTIME] = HRTIMER_BASE_REALTIME, | ^~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:120:21: note: (near initialization for 'hrtimer_clock_to_base_table[0]') kernel/time/hrtimer.c:121:22: warning: initialized field overwritten [-Woverride-init] 121 | [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC, | ^~~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:121:22: note: (near initialization for 'hrtimer_clock_to_base_table[1]') kernel/time/hrtimer.c:122:21: warning: initialized field overwritten [-Woverride-init] 122 | [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME, | ^~~~~~~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:122:21: note: (near initialization for 'hrtimer_clock_to_base_table[7]') kernel/time/hrtimer.c:123:17: warning: initialized field overwritten [-Woverride-init] 123 | [CLOCK_TAI] = HRTIMER_BASE_TAI, | ^~~~~~~~~~~~~~~~ kernel/time/hrtimer.c:123:17: note: (near initialization for 'hrtimer_clock_to_base_table[11]') 1986 | void cpu_chill(void) | ^~~~~~~~~ vim +/_local_bh_enable_rt +162 kernel/softirq.c 96fac673174324 Sebastian Andrzej Siewior 2019-05-20 161 96fac673174324 Sebastian Andrzej Siewior 2019-05-20 @162 void _local_bh_enable_rt(void) 96fac673174324 Sebastian Andrzej Siewior 2019-05-20 163 { 96fac673174324 Sebastian Andrzej Siewior 2019-05-20 164 _local_bh_enable(); 96fac673174324 Sebastian Andrzej Siewior 2019-05-20 165 } 96fac673174324 Sebastian Andrzej Siewior 2019-05-20 166 :::::: The code at line 162 was first introduced by commit :::::: 96fac67317432408cc4b8b1f317673cb0ede399d softirq: Add preemptible softirq :::::: TO: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; :::::: CC: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org