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BUG: KCSAN: data-race in console_unlock / console_unlock

write to 0xffffffff8454e940 of 8 bytes by task 14763 on cpu 0:
 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:571 [inline]
 blk_add_partitions+0x686/0xa80 block/partitions/core.c:653
 bdev_disk_changed+0x2d3/0x340 fs/block_dev.c:1274
 loop_reread_partitions drivers/block/loop.c:656 [inline]
 loop_set_status+0x75f/0x7e0 drivers/block/loop.c:1419
 lo_ioctl+0x758/0x11f0 drivers/block/loop.c:1487
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585
 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

read to 0xffffffff8454e940 of 8 bytes by task 14768 on cpu 1:
 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:571 [inline]
 blk_add_partitions+0x686/0xa80 block/partitions/core.c:653
 bdev_disk_changed+0x2d3/0x340 fs/block_dev.c:1274
 loop_reread_partitions drivers/block/loop.c:656 [inline]
 loop_set_status+0x75f/0x7e0 drivers/block/loop.c:1419
 lo_ioctl+0x758/0x11f0 drivers/block/loop.c:1487
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:585
 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: 0x00000000000019e8 -> 0x00000000000019e9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14768 Comm: syz-executor.4 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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