================================================================== BUG: KCSAN: data-race in blk_mq_unfreeze_queue / blk_queue_enter write to 0xffff8881012e1d6c of 4 bytes by task 28647 on cpu 1: blk_mq_unfreeze_queue+0x3c/0xc0 block/blk-mq.c:194 loop_set_status+0x438/0x5a0 drivers/block/loop.c:1501 lo_ioctl+0x764/0x1210 drivers/block/loop.c:1622 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585 block_ioctl+0x6d/0x80 fs/block_dev.c:1602 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881012e1d6c of 4 bytes by task 28635 on cpu 0: blk_queue_enter+0x2b8/0x560 block/blk-core.c:469 bio_queue_enter block/blk-core.c:484 [inline] __submit_bio_noacct_mq block/blk-core.c:1004 [inline] submit_bio_noacct+0x6d4/0x7e0 block/blk-core.c:1046 submit_bio+0x10c/0x190 include/linux/vmstat.h:81 mpage_bio_submit fs/mpage.c:66 [inline] mpage_readahead+0x23e/0x280 fs/mpage.c:393 blkdev_readahead+0x18/0x20 fs/block_dev.c:649 read_pages+0x9f/0x530 mm/readahead.c:130 page_cache_ra_unbounded+0x3c8/0x410 mm/readahead.c:238 do_page_cache_ra mm/readahead.c:267 [inline] force_page_cache_ra+0x246/0x280 mm/readahead.c:299 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:573 page_cache_sync_readahead include/linux/pagemap.h:884 [inline] filemap_get_pages mm/filemap.c:2467 [inline] filemap_read+0x388/0x1230 mm/filemap.c:2550 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 blkdev_read_iter+0xb9/0xf0 fs/block_dev.c:1670 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x565/0x5d0 fs/read_write.c:496 ksys_read+0xce/0x180 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:642 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 28635 Comm: systemd-udevd Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================