loop3: detected capacity change from 0 to 4 EXT4-fs (loop3): Journaled quota options ignored when QUOTA feature is enabled EXT4-fs (loop3): unsupported descriptor size 0 ================================================================== BUG: KCSAN: data-race in __blkdev_put / __blkdev_put write to 0xffff8881013a16e0 of 4 bytes by task 15609 on cpu 1: __blkdev_put+0x122/0x460 fs/block_dev.c:1573 blkdev_put+0x23e/0x2c0 fs/block_dev.c:1636 blkdev_close+0x47/0x50 fs/block_dev.c:1644 __fput+0x25b/0x4e0 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881013a16e0 of 4 bytes by task 15860 on cpu 0: __blkdev_put+0x5a/0x460 fs/block_dev.c:1566 blkdev_put+0x23e/0x2c0 fs/block_dev.c:1636 kill_block_super+0x7b/0x90 fs/super.c:1398 deactivate_locked_super+0x65/0xd0 fs/super.c:335 mount_bdev+0x204/0x290 fs/super.c:1370 ext4_mount+0x2d/0x40 fs/ext4/super.c:6639 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x11d4/0x1ce0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000004 -> 0x00000003 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 15860 Comm: syz-executor.3 Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================