loop1: p2 < >
ldm_parse_privhead(): Cannot find PRIVHEAD structure. LDM database is corrupt. Aborting.
ldm_validate_privheads(): Cannot find PRIVHEAD 1.
 loop0: p2 < >
==================================================================
BUG: KCSAN: data-race in __blkdev_get / __blkdev_put

write to 0xffff8881206eba84 of 4 bytes by task 8728 on cpu 0:
 __blkdev_get+0xaa9/0xe30 fs/block_dev.c:1564
 blkdev_get fs/block_dev.c:1639 [inline]
 blkdev_open+0x123/0x170 fs/block_dev.c:1753
 do_dentry_open+0x52d/0x890 fs/open.c:817
 vfs_open+0x43/0x50 fs/open.c:931
 do_open fs/namei.c:3251 [inline]
 path_openat+0x1844/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3395
 do_sys_openat2+0x33b/0x500 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1188
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881206eba84 of 4 bytes by task 5078 on cpu 1:
 __blkdev_put+0x5c/0x4a0 fs/block_dev.c:1768
 blkdev_put+0x1e6/0x210 fs/block_dev.c:1846
 blkdev_close+0x47/0x50 fs/block_dev.c:1853
 __fput+0x246/0x4d0 fs/file_table.c:281
 ____fput+0x11/0x20 fs/file_table.c:314
 task_work_run+0x8e/0x110 kernel/task_work.c:141
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:163 [inline]
 exit_to_user_mode_prepare+0x1b2/0x210 kernel/entry/common.c:190
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:265
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5078 Comm: systemd-udevd Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================