==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237c26b30 of 8 bytes by task 24925 on cpu 0:
 bh_lru_install fs/buffer.c:1337 [inline]
 __find_get_block+0x430/0x8a0 fs/buffer.c:1400
 bdev_getblk+0x30/0x3b0 fs/buffer.c:1425
 __getblk include/linux/buffer_head.h:379 [inline]
 sb_getblk include/linux/buffer_head.h:385 [inline]
 __ext4_get_inode_loc+0x328/0x9a0 fs/ext4/inode.c:4455
 ext4_get_inode_loc+0x6a/0xe0 fs/ext4/inode.c:4583
 ext4_xattr_ibody_get+0xa0/0x2e0 fs/ext4/xattr.c:644
 ext4_xattr_get+0xf3/0x4d0 fs/ext4/xattr.c:705
 ext4_xattr_security_get+0x32/0x40 fs/ext4/xattr_security.c:20
 __vfs_getxattr+0x29f/0x2b0 fs/xattr.c:423
 get_vfs_caps_from_disk+0xa2/0x320 security/commoncap.c:684
 get_file_caps security/commoncap.c:775 [inline]
 cap_bprm_creds_from_file+0x1a6/0xc80 security/commoncap.c:927
 security_bprm_creds_from_file+0x3d/0x80 security/security.c:1285
 bprm_creds_from_file fs/exec.c:1703 [inline]
 begin_new_exec+0x1fd/0x1150 fs/exec.c:1213
 load_elf_binary+0x65a/0x1a50 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1778 [inline]
 exec_binprm fs/exec.c:1810 [inline]
 bprm_execve+0x48b/0x9c0 fs/exec.c:1862
 kernel_execve+0x694/0x6d0 fs/exec.c:2028
 call_usermodehelper_exec_async+0x19d/0x250 kernel/umh.c:109
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888237c26b30 of 8 bytes by task 14537 on cpu 1:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1521
 smp_call_function_many_cond+0x30a/0xbc0 kernel/smp.c:838
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1052
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1530
 kill_bdev block/bdev.c:90 [inline]
 blkdev_flush_mapping+0x9b/0x1a0 block/bdev.c:674
 blkdev_put_whole block/bdev.c:681 [inline]
 bdev_release+0x2f9/0x420 block/bdev.c:1106
 blkdev_release+0x15/0x20 block/fops.c:660
 __fput+0x2ac/0x640 fs/file_table.c:465
 ____fput+0x1c/0x30 fs/file_table.c:493
 task_work_run+0x13c/0x1b0 kernel/task_work.c:227
 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:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888100566c98

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14537 Comm: syz-executor Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================