================================================================== BUG: KCSAN: data-race in blkdev_ioctl / set_capacity_and_notify write to 0xffff8881017aa4d8 of 8 bytes by task 28573 on cpu 0: i_size_write include/linux/fs.h:871 [inline] set_capacity block/genhd.c:41 [inline] set_capacity_and_notify+0xaa/0x1c0 block/genhd.c:55 loop_set_size drivers/block/loop.c:257 [inline] loop_configure+0xb58/0xd10 drivers/block/loop.c:1243 lo_ioctl+0x558/0x1210 drivers/block/loop.c:1781 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 0xffff8881017aa4d8 of 8 bytes by task 28572 on cpu 1: i_size_read include/linux/fs.h:849 [inline] blkdev_ioctl+0x147/0x3c0 block/ioctl.c:570 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 value changed: 0x0000000000000000 -> 0x0000000000011800 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 28572 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 ==================================================================