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BUG: KCSAN: data-race in console_unlock / console_unlock

write to 0xffffffff8417c940 of 8 bytes by task 16608 on cpu 1:
 console_unlock+0x570/0xb30 kernel/printk/printk.c:2632
 vprintk_emit+0x125/0x3d0 kernel/printk/printk.c:2174
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2185
 vprintk+0x15a/0x170 kernel/printk/printk_safe.c:392
 printk+0x62/0x87 kernel/printk/printk.c:2216
 blk_add_partition block/partitions/core.c:564 [inline]
 blk_add_partitions block/partitions/core.c:655 [inline]
 bdev_disk_changed+0x97f/0xea0 block/partitions/core.c:697
 loop_reread_partitions drivers/block/loop.c:693 [inline]
 loop_set_status+0x4dc/0x5a0 drivers/block/loop.c:1576
 lo_ioctl+0x7af/0x1340 drivers/block/loop.c:1686
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585
 block_ioctl+0x6d/0x80 fs/block_dev.c:1604
 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 0xffffffff8417c940 of 8 bytes by task 1579 on cpu 0:
 console_unlock+0x9f5/0xb30 kernel/printk/printk.c:2667
 vprintk_emit+0x125/0x3d0 kernel/printk/printk.c:2174
 vprintk_default+0x22/0x30 kernel/printk/printk.c:2185
 vprintk+0x15a/0x170 kernel/printk/printk_safe.c:392
 printk+0x62/0x87 kernel/printk/printk.c:2216
 blk_add_partition block/partitions/core.c:564 [inline]
 blk_add_partitions block/partitions/core.c:655 [inline]
 bdev_disk_changed+0x97f/0xea0 block/partitions/core.c:697
 blkdev_get_whole+0x2f2/0x350 fs/block_dev.c:1269
 blkdev_get_by_dev+0x2ad/0x8d0 fs/block_dev.c:1417
 blkdev_reread_part block/ioctl.c:102 [inline]
 blkdev_common_ioctl+0xfc8/0x1040 block/ioctl.c:510
 blkdev_ioctl+0x16e/0x3c0 block/ioctl.c:579
 block_ioctl+0x6d/0x80 fs/block_dev.c:1604
 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: 0x000000000000a815 -> 0x000000000000a816

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1579 Comm: systemd-udevd Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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