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BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lru

write to 0xffff888237d2a578 of 8 bytes by task 18712 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1430 [inline]
 invalidate_bh_lru+0x88/0xf0 fs/buffer.c:1442
 smp_call_function_many_cond+0x518/0xa60 kernel/smp.c:819
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:996
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1461
 invalidate_bdev+0x55/0x80 block/bdev.c:85
 invalidate_disk+0x29/0x80 block/genhd.c:705
 __loop_clr_fd+0x163/0x3b0 drivers/block/loop.c:1164
 loop_clr_fd drivers/block/loop.c:1257 [inline]
 lo_ioctl+0xe93/0x12e0 drivers/block/loop.c:1563
 blkdev_ioctl+0x38e/0x480 block/ioctl.c:615
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888237d2a578 of 8 bytes by task 18713 on cpu 0:
 has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1452
 smp_call_function_many_cond+0x2f0/0xa60 kernel/smp.c:775
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:996
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1461
 invalidate_bdev+0x55/0x80 block/bdev.c:85
 invalidate_disk+0x29/0x80 block/genhd.c:705
 __loop_clr_fd+0x163/0x3b0 drivers/block/loop.c:1164
 loop_clr_fd drivers/block/loop.c:1257 [inline]
 lo_ioctl+0xe93/0x12e0 drivers/block/loop.c:1563
 blkdev_ioctl+0x38e/0x480 block/ioctl.c:615
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff888109fd7b60 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18713 Comm: syz-executor.2 Not tainted 6.4.0-rc4-syzkaller-00265-g4ecd704a4c51 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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