On Mon, Jun 22, 2020 at 03:11:17PM +0300, Dan Carpenter wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git > dev.2020.06.17a > head: d3779e78b9848a707448dbb4a0cb6c4bb651fe9c > commit: 59a5d883f2ccdce1700862b5983cfd3473630aea [35/38] EXP sched: Alleged > fix for v5.8 merge-window scheduler issue > config: x86_64-randconfig-m001-20200621 (attached as .config) > compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <[email protected]> > Reported-by: Dan Carpenter <[email protected]> > > smatch warnings: > kernel/sched/core.c:2650 try_to_wake_up() error: uninitialized symbol 'cpu'. > > # > https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=59a5d883f2ccdce1700862b5983cfd3473630aea > git remote add rcu > https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git > git remote update rcu > git checkout 59a5d883f2ccdce1700862b5983cfd3473630aea > vim +/cpu +2650 kernel/sched/core.c > > ^1da177e4c3f41 kernel/sched.c Linus Torvalds 2005-04-16 2644 > b5179ac70de85e kernel/sched/core.c Peter Zijlstra 2016-05-11 2645 > ttwu_queue(p, cpu, wake_flags); > aacedf26fb7601 kernel/sched/core.c Peter Zijlstra 2019-06-07 2646 unlock: > 013fdb8086acaa kernel/sched.c Peter Zijlstra 2011-04-05 2647 > raw_spin_unlock_irqrestore(&p->pi_lock, flags); > aacedf26fb7601 kernel/sched/core.c Peter Zijlstra 2019-06-07 2648 out: > aacedf26fb7601 kernel/sched/core.c Peter Zijlstra 2019-06-07 2649 if > (success) > aacedf26fb7601 kernel/sched/core.c Peter Zijlstra 2019-06-07 @2650 > ttwu_stat(p, cpu, wake_flags); > > ^^^ > This can be uninitialized on a couple "goto unlock;" paths. Lines > 2581 and 2622. The KASan tool will warn about this at run time as well. > I'm not sure why the build bot doesn't include the whole function for > this bug report...
Indeed, lemme go fix.
