================================================================== BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list read-write to 0xffff888102350560 of 8 bytes by task 10687 on cpu 1: blk_mq_dispatch_rq_list+0x9a2/0xe50 block/blk-mq.c:1422 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:186 [inline] blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:199 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:310 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:341 __blk_mq_run_hw_queue block/blk-mq.c:1515 [inline] __blk_mq_delay_run_hw_queue+0x1ff/0x410 block/blk-mq.c:1592 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1645 blk_mq_sched_insert_requests+0x144/0x210 block/blk-mq-sched.c:501 blk_mq_flush_plug_list+0x2f5/0x400 block/blk-mq.c:1915 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1755 blk_finish_plug+0x44/0x60 block/blk-core.c:1772 __iomap_dio_rw+0x60f/0x9b0 fs/iomap/direct-io.c:539 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:605 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3bd/0x420 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read-write to 0xffff888102350560 of 8 bytes by task 10697 on cpu 0: blk_mq_dispatch_rq_list+0x9a2/0xe50 block/blk-mq.c:1422 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:186 [inline] blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:199 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:310 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:341 __blk_mq_run_hw_queue block/blk-mq.c:1515 [inline] __blk_mq_delay_run_hw_queue+0x1ff/0x410 block/blk-mq.c:1592 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1645 blk_mq_sched_insert_requests+0x144/0x210 block/blk-mq-sched.c:501 blk_mq_flush_plug_list+0x2f5/0x400 block/blk-mq.c:1915 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1755 blk_finish_plug+0x44/0x60 block/blk-core.c:1772 __iomap_dio_rw+0x60f/0x9b0 fs/iomap/direct-io.c:539 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:605 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x3bd/0x420 fs/ext4/file.c:129 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10697 Comm: syz-executor.4 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================