================================================================== BUG: KCSAN: data-race in __loop_clr_fd / blkdev_common_ioctl write to 0xffff888101999120 of 4 bytes by task 1774 on cpu 0: __loop_clr_fd+0x5b8/0x640 drivers/block/loop.c:1294 loop_clr_fd drivers/block/loop.c:1337 [inline] lo_ioctl+0x9eb/0x11f0 drivers/block/loop.c:1695 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585 block_ioctl+0x6d/0x80 fs/block_dev.c:1664 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_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888101999120 of 4 bytes by task 1035 on cpu 1: 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:1664 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_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1035 Comm: systemd-udevd Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073876480 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 62724 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073876736 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop2: p1 p2 p3 p4[EZD] loop2: p1 start 10 is beyond EOD, truncated loop2: p2 start 10 is beyond EOD, truncated loop2: p3 start 225 is beyond EOD, truncated loop2: p4 size 3657465856 extends beyond EOD, truncated loop2: p1 p2 p3 p4[EZD] loop2: p1 start 10 is beyond EOD, truncated loop2: p2 start 11 is beyond EOD, truncated loop2: p3 start 225 is beyond EOD, truncated loop2: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073877504 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073877760 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 524352 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073884672 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073884672 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073889024 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 16777216 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop2: p1 p2 p3 p4[EZD] loop2: p1 start 10 is beyond EOD, truncated loop2: p2 start 38 is beyond EOD, truncated loop2: p3 start 225 is beyond EOD, truncated loop2: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073889280 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 33554432 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073892352 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 50331648 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073892352 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 67108864 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 67108864 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 83886080 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop4: p1 p2 p3 p4[EZD] loop4: p1 start 10 is beyond EOD, truncated loop4: p2 start 100663296 is beyond EOD, truncated loop4: p3 start 225 is beyond EOD, truncated loop4: p4 size 3657465856 extends beyond EOD, truncated loop2: p1 p2 p3 p4[EZD] loop2: p1 start 10 is beyond EOD, truncated loop2: p2 start 104 is beyond EOD, truncated loop2: p3 start 225 is beyond EOD, truncated loop2: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073897736 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop2: p1 p2 p3 p4[EZD] loop2: p1 start 10 is beyond EOD, truncated loop2: p2 start 116 is beyond EOD, truncated loop2: p3 start 225 is beyond EOD, truncated loop2: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073897992 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated loop0: p1 p2 p3 p4[EZD] loop0: p1 start 10 is beyond EOD, truncated loop0: p2 size 1073899520 extends beyond EOD, truncated loop0: p3 start 225 is beyond EOD, truncated loop0: p4 size 3657465856 extends beyond EOD, truncated