================================================================== BUG: KCSAN: data-race in __rcu_read_unlock / sync_rcu_exp_select_cpus read to 0xffffffff85a7d180 of 8 bytes by task 15858 on cpu 1: rcu_read_unlock_special kernel/rcu/tree_plugin.h:615 [inline] __rcu_read_unlock+0x381/0x3c0 kernel/rcu/tree_plugin.h:383 rcu_read_unlock include/linux/rcupdate.h:652 [inline] filemap_map_pages+0x5b3/0x990 mm/filemap.c:2688 do_fault_around mm/memory.c:3450 [inline] do_read_fault mm/memory.c:3484 [inline] do_fault mm/memory.c:3618 [inline] handle_pte_fault mm/memory.c:3849 [inline] __handle_mm_fault+0x2544/0x2c70 mm/memory.c:3973 handle_mm_fault+0x21b/0x530 mm/memory.c:4010 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202 write to 0xffffffff85a7d180 of 8 bytes by task 14287 on cpu 0: sync_exp_reset_tree kernel/rcu/tree_exp.h:137 [inline] sync_rcu_exp_select_cpus+0xd5/0x590 kernel/rcu/tree_exp.h:427 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:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 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: 14287 Comm: kworker/0:1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: rcu_gp wait_rcu_exp_gp ==================================================================