================================================================== BUG: KCSAN: data-race in blk_mq_run_hw_queue / blk_mq_sched_insert_request read to 0xffff888129eb5810 of 8 bytes by task 31786 on cpu 0: list_empty_careful include/linux/list.h:287 [inline] blk_mq_hctx_has_pending block/blk-mq.c:69 [inline] blk_mq_run_hw_queue+0x10e/0x1c0 block/blk-mq.c:1469 blk_mq_make_request+0xb42/0xf60 block/blk-mq.c:1955 generic_make_request block/blk-core.c:1066 [inline] generic_make_request+0x196/0x700 block/blk-core.c:1008 submit_bio+0x96/0x3c0 block/blk-core.c:1192 submit_bio_wait+0xb8/0x100 block/bio.c:975 blkdev_issue_flush+0x163/0x1c0 block/blk-flush.c:472 ext4_sync_file+0x6a8/0xaf0 fs/ext4/fsync.c:179 vfs_fsync_range+0x82/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2856 [inline] iomap_dio_complete+0x3bc/0x400 fs/iomap/direct-io.c:120 iomap_dio_rw+0x8e3/0x9a0 fs/iomap/direct-io.c:569 ext4_dio_write_iter fs/ext4/file.c:438 [inline] ext4_file_write_iter+0xc38/0xd40 fs/ext4/file.c:545 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888129eb5810 of 8 bytes by task 2504 on cpu 1: __list_add include/linux/list.h:63 [inline] list_add include/linux/list.h:79 [inline] blk_mq_sched_bypass_insert block/blk-mq-sched.c:367 [inline] blk_mq_sched_insert_request+0x2fd/0x3f0 block/blk-mq-sched.c:394 blk_mq_requeue_work+0x370/0x460 block/blk-mq.c:738 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: 1 PID: 2504 Comm: kworker/1:1H Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_requeue_work ==================================================================