================================================================== BUG: KCSAN: data-race in blk_stat_add / blk_stat_timer_fn read to 0xffffe8ffffd2f340 of 4 bytes by interrupt on cpu 0: blk_rq_stat_sum block/blk-stat.c:31 [inline] blk_stat_timer_fn+0x364/0x3d0 block/blk-stat.c:94 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0xc0c/0xcd0 kernel/time/timer.c:1786 __do_softirq+0x115/0x33f kernel/softirq.c:292 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 write to 0xffffe8ffffd2f340 of 4 bytes by interrupt on cpu 1: blk_rq_stat_add block/blk-stat.c:48 [inline] blk_stat_add+0x217/0x2c0 block/blk-stat.c:74 __blk_mq_end_request+0x22d/0x270 block/blk-mq.c:527 scsi_end_request+0x1dd/0x360 drivers/scsi/scsi_lib.c:610 scsi_io_completion+0x11d/0xc80 drivers/scsi/scsi_lib.c:960 scsi_finish_command+0x283/0x380 drivers/scsi/scsi.c:228 scsi_softirq_done+0x259/0x280 drivers/scsi/scsi_lib.c:1476 blk_done_softirq+0x1eb/0x250 block/blk-softirq.c:37 __do_softirq+0x115/0x33f kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xbb/0xe0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] do_IRQ+0x81/0x130 arch/x86/kernel/irq.c:263 ret_from_intr+0x0/0x21 arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] kcsan_setup_watchpoint+0x1d4/0x460 kernel/kcsan/core.c:429 check_access kernel/kcsan/core.c:459 [inline] __tsan_read4+0xc6/0x100 kernel/kcsan/core.c:588 wait_task_stopped kernel/exit.c:1140 [inline] wait_consider_task+0x279/0x1c60 kernel/exit.c:1344 do_wait_thread kernel/exit.c:1370 [inline] do_wait+0x1c9/0x4c0 kernel/exit.c:1441 kernel_wait4+0x156/0x240 kernel/exit.c:1613 __do_sys_wait4+0xea/0x100 kernel/exit.c:1625 __se_sys_wait4 kernel/exit.c:1621 [inline] __x64_sys_wait4+0x5e/0x80 kernel/exit.c:1621 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7749 Comm: syz-executor.5 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================