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BUG: KCSAN: data-race in has_bh_in_lru / invalidate_bh_lrus_cpu

write to 0xffff888237d22f18 of 8 bytes by task 29234 on cpu 1:
 __invalidate_bh_lrus fs/buffer.c:1393 [inline]
 invalidate_bh_lrus_cpu+0xad/0xe0 fs/buffer.c:1434
 lru_add_drain_cpu+0x256/0x280 mm/swap.c:623
 lru_add_drain mm/swap.c:702 [inline]
 __pagevec_release+0x57/0xa0 mm/swap.c:967
 pagevec_release include/linux/pagevec.h:81 [inline]
 shmem_undo_range+0x3af/0xea0 mm/shmem.c:959
 shmem_truncate_range mm/shmem.c:1058 [inline]
 shmem_evict_inode+0x115/0x5b0 mm/shmem.c:1140
 evict+0x1c8/0x3c0 fs/inode.c:586
 iput_final fs/inode.c:1662 [inline]
 iput+0x430/0x580 fs/inode.c:1688
 dentry_unlink_inode+0x273/0x290 fs/dcache.c:376
 __dentry_kill+0x2af/0x4e0 fs/dcache.c:582
 dput+0xc6/0x360 fs/dcache.c:888
 do_renameat2+0x6fb/0xa20 fs/namei.c:4781
 __do_sys_rename fs/namei.c:4825 [inline]
 __se_sys_rename fs/namei.c:4823 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4823
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d22f18 of 8 bytes by task 29317 on cpu 0:
 has_bh_in_lru+0x31/0x1c0 fs/buffer.c:1415
 smp_call_function_many_cond+0x236/0x620 kernel/smp.c:917
 on_each_cpu_cond_mask+0x31/0x40 kernel/smp.c:1135
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x26/0x30 fs/buffer.c:1424
 invalidate_bdev+0x51/0x80 block/bdev.c:86
 __loop_clr_fd+0x521/0x850 drivers/block/loop.c:1399
 loop_clr_fd drivers/block/loop.c:1494 [inline]
 lo_ioctl+0xac5/0x13e0 drivers/block/loop.c:1850
 blkdev_ioctl+0x1d0/0x3f0 block/ioctl.c:589
 block_ioctl+0x6e/0x80 block/fops.c:477
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888105f625b0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29317 Comm: syz-executor.2 Tainted: G        W         5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
loop2: detected capacity change from 0 to 512
EXT4-fs (loop2): bad geometry: block count 2097280 exceeds size of device (128 blocks)