================================================================== BUG: KCSAN: data-race in __loop_clr_fd / blkdev_common_ioctl write to 0xffff888100cd9720 of 4 bytes by task 1775 on cpu 1: __loop_clr_fd+0x5be/0x650 drivers/block/loop.c:1293 loop_clr_fd drivers/block/loop.c:1336 [inline] lo_ioctl+0x9eb/0x11f0 drivers/block/loop.c:1694 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585 block_ioctl+0x6d/0x80 fs/block_dev.c:1671 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888100cd9720 of 4 bytes by task 1026 on cpu 0: disk_max_parts include/linux/genhd.h:189 [inline] disk_part_scan_enabled include/linux/genhd.h:196 [inline] blkdev_reread_part block/ioctl.c:88 [inline] blkdev_common_ioctl+0x54c/0x1040 block/ioctl.c:510 blkdev_ioctl+0x16e/0x3c0 block/ioctl.c:579 block_ioctl+0x6d/0x80 fs/block_dev.c:1671 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1026 Comm: systemd-udevd Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 2415919104 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 2415919104 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 67108864 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 67108864 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 3992977408 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465859 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 1644167168 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 2248146944 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 100663296 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 100663296 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 2147483648 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 4110417920 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465862 extends beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465863 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 3321888768 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 3355443200 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 3355443200 is beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 size 1073872896 extends beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 start 3372220416 is beyond EOD, truncated loop5: p1 p2 p3 p4[EZD] loop5: p1 start 10 is beyond EOD, truncated loop5: p2 size 1073872896 extends beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated