================================================================== BUG: KCSAN: data-race in find_next_bit / rcu_report_exp_cpu_mult write to 0xffffffff85c7d080 of 8 bytes by task 14182 on cpu 1: rcu_report_exp_cpu_mult+0x4f/0xa0 kernel/rcu/tree_exp.h:244 rcu_report_exp_rdp+0x6c/0x90 kernel/rcu/tree_exp.h:254 rcu_preempt_deferred_qs_irqrestore+0x3bb/0x580 kernel/rcu/tree_plugin.h:464 rcu_preempt_deferred_qs+0xae/0xf0 kernel/rcu/tree_plugin.h:574 rcu_note_context_switch+0xa5/0x760 kernel/rcu/tree_plugin.h:317 __schedule+0xa4/0x690 kernel/sched/core.c:4019 schedule+0x4a/0x100 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 mutex_optimistic_spin kernel/locking/mutex.c:707 [inline] __mutex_lock_common kernel/locking/mutex.c:1055 [inline] __mutex_lock.isra.0+0x5c9/0x740 kernel/locking/mutex.c:1106 __mutex_lock_killable_slowpath+0x1f/0x30 kernel/locking/mutex.c:1373 mutex_lock_killable+0x40/0x60 kernel/locking/mutex.c:1340 rtnl_lock_killable+0x20/0x30 net/core/rtnetlink.c:78 register_netdev+0x1d/0x60 net/core/dev.c:9436 ip6gre_init_net+0x244/0x2c0 net/ipv6/ip6_gre.c:1582 ops_init+0x8c/0x240 net/core/net_namespace.c:137 setup_net+0x191/0x4b0 net/core/net_namespace.c:335 copy_net_ns+0x1e7/0x400 net/core/net_namespace.c:476 create_new_namespaces+0x2e2/0x550 kernel/nsproxy.c:103 copy_namespaces+0x153/0x1b0 kernel/nsproxy.c:161 copy_process+0x2067/0x3c40 kernel/fork.c:2075 _do_fork+0xfe/0x7a0 kernel/fork.c:2421 __do_sys_clone kernel/fork.c:2576 [inline] __se_sys_clone kernel/fork.c:2557 [inline] __x64_sys_clone+0x130/0x170 kernel/fork.c:2557 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffffff85c7d080 of 8 bytes by task 8936 on cpu 0: _find_next_bit lib/find_bit.c:39 [inline] find_next_bit+0x57/0xe0 lib/find_bit.c:70 sync_rcu_exp_select_node_cpus+0x28e/0x510 kernel/rcu/tree_exp.h:375 sync_rcu_exp_select_cpus+0x30c/0x590 kernel/rcu/tree_exp.h:439 rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:575 [inline] wait_rcu_exp_gp+0x25/0x40 kernel/rcu/tree_exp.h:589 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264 worker_thread+0xa0/0x800 kernel/workqueue.c:2410 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8936 Comm: kworker/0:7 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: rcu_gp wait_rcu_exp_gp ==================================================================