================================================================== BUG: KCSAN: data-race in iomap_dio_bio_actor / iomap_dio_bio_end_io read to 0xffff888121b9b224 of 4 bytes by interrupt on cpu 1: iomap_dio_bio_end_io+0x4c/0x2b0 fs/iomap/direct-io.c:149 bio_endio+0x2fa/0x400 block/bio.c:1821 req_bio_endio block/blk-core.c:245 [inline] blk_update_request+0x427/0x7b0 block/blk-core.c:1464 scsi_end_request+0x6b/0x360 drivers/scsi/scsi_lib.c:576 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_enable arch/x86/include/asm/paravirt.h:762 [inline] preempt_schedule_irq+0x4d/0x90 kernel/sched/core.c:4337 restore_regs_and_return_to_kernel+0x0/0x25 check_kcov_mode kernel/kcov.c:153 [inline] write_comp_data+0x17/0x70 kernel/kcov.c:208 blk_rq_merge_ok+0x12c/0x330 block/blk-merge.c:868 blk_attempt_plug_merge+0x10a/0x210 block/blk-core.c:720 blk_mq_make_request+0x87c/0xf60 block/blk-mq.c:1926 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 iomap_dio_submit_bio.isra.0+0xfc/0x120 fs/iomap/direct-io.c:70 iomap_dio_bio_actor+0x40a/0x960 fs/iomap/direct-io.c:306 iomap_dio_actor+0x87/0x3a0 fs/iomap/direct-io.c:382 iomap_apply+0x20d/0x6a0 fs/iomap/apply.c:80 iomap_dio_rw+0x67e/0x9a0 fs/iomap/direct-io.c:498 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] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff888121b9b224 of 4 bytes by task 28970 on cpu 0: iomap_dio_bio_actor+0x6dc/0x960 fs/iomap/direct-io.c:293 iomap_dio_actor+0x87/0x3a0 fs/iomap/direct-io.c:382 iomap_apply+0x20d/0x6a0 fs/iomap/apply.c:80 iomap_dio_rw+0x67e/0x9a0 fs/iomap/direct-io.c:498 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] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 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: 0 PID: 28970 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 ==================================================================