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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d26b70 of 8 bytes by task 10576 on cpu 1:
 bh_lru_install fs/buffer.c:1348 [inline]
 find_get_block_common+0x4f0/0x960 fs/buffer.c:1413
 __find_get_block_nonatomic fs/buffer.c:1432 [inline]
 bdev_getblk+0x7f/0x3d0 fs/buffer.c:1456
 getblk_unmovable include/linux/buffer_head.h:371 [inline]
 ext4_getblk+0x1b6/0x510 fs/ext4/inode.c:868
 ext4_bread_batch+0x5c/0x320 fs/ext4/inode.c:937
 __ext4_find_entry+0x840/0xf40 fs/ext4/namei.c:1603
 ext4_lookup_entry fs/ext4/namei.c:1705 [inline]
 ext4_lookup+0xbb/0x390 fs/ext4/namei.c:1773
 lookup_open fs/namei.c:3679 [inline]
 open_last_lookups fs/namei.c:3800 [inline]
 path_openat+0xcf0/0x2170 fs/namei.c:4036
 do_filp_open+0x109/0x230 fs/namei.c:4066
 do_open_execat+0xd8/0x260 fs/exec.c:893
 alloc_bprm+0x28/0x660 fs/exec.c:1518
 do_execveat_common+0x12e/0x750 fs/exec.c:1919
 do_execve fs/exec.c:2042 [inline]
 __do_sys_execve fs/exec.c:2118 [inline]
 __se_sys_execve fs/exec.c:2113 [inline]
 __x64_sys_execve+0x5c/0x70 fs/exec.c:2113
 x64_sys_call+0x13ab/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:60
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d26b70 of 8 bytes by task 3318 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1554
 smp_call_function_many_cond+0x394/0xb20 kernel/smp.c:838
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1052
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1563
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9a/0x1a0 block/bdev.c:712
 blkdev_put_whole block/bdev.c:719 [inline]
 bdev_release+0x2bf/0x3d0 block/bdev.c:1144
 blkdev_release+0x15/0x20 block/fops.c:660
 __fput+0x29b/0x650 fs/file_table.c:465
 ____fput+0x1c/0x30 fs/file_table.c:493
 task_work_run+0x131/0x1a0 kernel/task_work.c:227
 resume_user_mode_work+0x6a/0x70 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x77/0xb0 kernel/entry/common.c:218
 do_syscall_64+0xdd/0x1a0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888122e2e138

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3318 Comm: syz-executor Not tainted 6.15.0-rc6-syzkaller-00085-gc94d59a126cb #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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