================================================================== BUG: KCSAN: data-race in __rcu_read_unlock / sync_rcu_exp_select_cpus read to 0xffffffff85c7d140 of 8 bytes by task 17052 on cpu 1: rcu_read_unlock_special kernel/rcu/tree_plugin.h:615 [inline] __rcu_read_unlock+0x392/0x3d0 kernel/rcu/tree_plugin.h:383 rcu_read_unlock include/linux/rcupdate.h:670 [inline] filemap_map_pages+0x5b3/0x990 mm/filemap.c:2667 do_fault_around mm/memory.c:3546 [inline] do_read_fault mm/memory.c:3580 [inline] do_fault mm/memory.c:3714 [inline] handle_pte_fault mm/memory.c:3945 [inline] __handle_mm_fault+0x2a92/0x2e00 mm/memory.c:4075 handle_mm_fault+0x21b/0x530 mm/memory.c:4112 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:1203 write to 0xffffffff85c7d140 of 8 bytes by task 12 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: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: 12 Comm: kworker/0:1 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 ==================================================================