================================================================== BUG: KCSAN: data-race in __bio_queue_enter / blk_mq_unfreeze_queue write to 0xffff888101e66c8c of 4 bytes by task 13423 on cpu 1: __blk_mq_unfreeze_queue block/blk-mq.c:223 [inline] blk_mq_unfreeze_queue+0x3c/0xc0 block/blk-mq.c:234 loop_set_status+0x487/0x5d0 drivers/block/loop.c:1300 lo_ioctl+0x785/0x1270 blkdev_ioctl+0x20e/0x440 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888101e66c8c of 4 bytes by task 13417 on cpu 0: __bio_queue_enter+0x1ea/0x500 block/blk-core.c:443 bio_queue_enter block/blk.h:91 [inline] blk_mq_get_request block/blk-mq.c:2587 [inline] blk_mq_submit_bio+0x2a6/0x1470 block/blk-mq.c:2633 __submit_bio+0x131/0x340 block/blk-core.c:851 __submit_bio_noacct_mq block/blk-core.c:926 [inline] submit_bio_noacct+0x418/0x4e0 block/blk-core.c:952 submit_bio+0x10c/0x180 blk_next_bio block/blk-lib.c:19 [inline] __blkdev_issue_zero_pages+0x19f/0x370 block/blk-lib.c:319 blkdev_issue_zeroout+0x173/0x290 block/blk-lib.c:413 blkdev_fallocate+0x2a7/0x2d0 vfs_fallocate+0x486/0x720 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0x75/0xc0 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 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: 13417 Comm: syz-executor.1 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================