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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d26f70 of 8 bytes by task 6392 on cpu 1:
 bh_lru_install fs/buffer.c:1351 [inline]
 find_get_block_common+0x4f0/0x960 fs/buffer.c:1416
 __getblk_slow fs/buffer.c:-1 [inline]
 bdev_getblk+0x325/0x3d0 fs/buffer.c:1467
 ext4_sb_breadahead_unmovable+0x45/0x180 fs/ext4/super.c:270
 __ext4_get_inode_loc+0x709/0x930 fs/ext4/inode.c:4538
 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4568 [inline]
 __ext4_iget+0x2ea/0x1fe0 fs/ext4/inode.c:4815
 __ext4_fill_super fs/ext4/super.c:5502 [inline]
 ext4_fill_super+0x26ea/0x34e0 fs/ext4/super.c:5726
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1686
 get_tree_bdev+0x1f/0x30 fs/super.c:1709
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5758
 vfs_get_tree+0x54/0x1d0 fs/super.c:1809
 do_new_mount+0x207/0x680 fs/namespace.c:3882
 path_mount+0x4a4/0xb20 fs/namespace.c:4209
 do_mount fs/namespace.c:4222 [inline]
 __do_sys_mount fs/namespace.c:4433 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4410
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4410
 x64_sys_call+0xd36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d26f70 of 8 bytes by task 5986 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1557
 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:1566
 invalidate_bdev+0x42/0x70 block/bdev.c:100
 ext4_put_super+0x624/0x7d0 fs/ext4/super.c:1343
 generic_shutdown_super+0xe6/0x210 fs/super.c:643
 kill_block_super+0x2a/0x70 fs/super.c:1760
 ext4_kill_sb+0x42/0x80 fs/ext4/super.c:7393
 deactivate_locked_super+0x72/0x1c0 fs/super.c:474
 deactivate_super+0x97/0xa0 fs/super.c:507
 cleanup_mnt+0x269/0x2e0 fs/namespace.c:1432
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1439
 task_work_run+0x12e/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe4/0x100 kernel/entry/common.c:114
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88811d0402d8 -> 0xffff88811d0404e0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5986 Comm: syz-executor Not tainted 6.15.0-syzkaller-03645-g3d413f0cfd7e #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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