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BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d2bb20 of 8 bytes by task 3322 on cpu 1:
 bh_lru_install fs/buffer.c:1343 [inline]
 __find_get_block+0x46b/0x8a0 fs/buffer.c:1406
 bdev_getblk+0x30/0x3b0 fs/buffer.c:1431
 __getblk include/linux/buffer_head.h:380 [inline]
 sb_getblk include/linux/buffer_head.h:386 [inline]
 ext4_getblk+0x1b4/0x500 fs/ext4/inode.c:859
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:905
 ext4_readdir+0x7bd/0x1ba0 fs/ext4/dir.c:200
 iterate_dir+0x11d/0x310 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x88/0x1a0 fs/readdir.c:392
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:392
 x64_sys_call+0x29b3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d2bb20 of 8 bytes by task 3321 on cpu 0:
 has_bh_in_lru+0x70/0x1f0 fs/buffer.c:1527
 cpu_needs_drain mm/swap.c:779 [inline]
 __lru_add_drain_all+0x23f/0x3f0 mm/swap.c:866
 lru_add_drain_all+0x10/0x20 mm/swap.c:882
 invalidate_bdev+0x47/0x70 block/bdev.c:101
 ext4_put_super+0x571/0x840 fs/ext4/super.c:1349
 generic_shutdown_super+0xe5/0x220 fs/super.c:642
 kill_block_super+0x2a/0x70 fs/super.c:1710
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7320
 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473
 deactivate_super+0x9f/0xb0 fs/super.c:506
 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1373
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1380
 task_work_run+0x13a/0x1a0 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888106b298f0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3321 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller-00125-gcfaaa7d010d1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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