================================================================== BUG: KCSAN: data-race in __blkdev_get / __blkdev_put write to 0xffff88810138a720 of 4 bytes by task 27715 on cpu 1: __blkdev_get+0xc1/0x6d0 fs/block_dev.c:1363 blkdev_get_by_dev+0x9b/0x480 fs/block_dev.c:1451 blkdev_open+0xb3/0x130 fs/block_dev.c:1546 do_dentry_open+0x53e/0x830 fs/open.c:826 vfs_open+0x43/0x50 fs/open.c:940 do_open fs/namei.c:3361 [inline] path_openat+0x184e/0x20b0 fs/namei.c:3494 do_filp_open+0xd9/0x1f0 fs/namei.c:3521 do_sys_openat2+0xa3/0x250 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_openat fs/open.c:1219 [inline] __se_sys_openat fs/open.c:1214 [inline] __x64_sys_openat+0xef/0x110 fs/open.c:1214 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810138a720 of 4 bytes by task 1036 on cpu 0: __blkdev_put+0x5a/0x460 fs/block_dev.c:1566 blkdev_put+0x23e/0x2c0 fs/block_dev.c:1636 blkdev_reread_part block/ioctl.c:105 [inline] blkdev_common_ioctl+0x101f/0x1040 block/ioctl.c:510 blkdev_ioctl+0x16e/0x3c0 block/ioctl.c:579 block_ioctl+0x6d/0x80 fs/block_dev.c:1662 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 value changed: 0x00000003 -> 0x00000004 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1036 Comm: systemd-udevd Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated loop5: p1 p2 p3 p4 loop5: p1 start 10 is beyond EOD, truncated loop5: p2 start 1073741824 is beyond EOD, truncated loop5: p3 start 225 is beyond EOD, truncated loop5: p4 size 3657465856 extends beyond EOD, truncated