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BUG: KCSAN: data-race in find_get_block_common / has_bh_in_lru

read-write to 0xffff888237d277a0 of 8 bytes by task 4072 on cpu 1:
 bh_lru_install fs/buffer.c:1242 [inline]
 find_get_block_common+0x459/0x870 fs/buffer.c:1307
 bdev_getblk+0x4d/0x3f0 include/linux/gfp.h:-1
 getblk_unmovable include/linux/buffer_head.h:369 [inline]
 ext4_getblk+0x1ca/0x530 fs/ext4/inode.c:1007
 ext4_bread_batch+0x5c/0x320 fs/ext4/inode.c:1076
 __ext4_find_entry+0x852/0xdf0 fs/ext4/namei.c:1601
 ext4_find_entry fs/ext4/namei.c:1683 [inline]
 ext4_rmdir+0x17f/0x660 fs/ext4/namei.c:3158
 vfs_rmdir+0x2b2/0x440 fs/namei.c:5366
 filename_rmdir+0x1a6/0x360 fs/namei.c:5421
 __do_sys_unlinkat fs/namei.c:5596 [inline]
 __se_sys_unlinkat+0x6e/0x140 fs/namei.c:5589
 __x64_sys_unlinkat+0x43/0x50 fs/namei.c:5589
 x64_sys_call+0x1120/0x3020 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d277a0 of 8 bytes by task 25070 on cpu 0:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1448
 smp_call_function_many_cond+0x2a7/0xb70 kernel/smp.c:836
 on_each_cpu_cond_mask+0x3c/0x80 kernel/smp.c:1057
 on_each_cpu_cond include/linux/smp.h:106 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1457
 kill_bdev block/bdev.c:90 [inline]
 set_blocksize+0x1e3/0x270 block/bdev.c:207
 sb_set_blocksize+0x93/0x170 block/bdev.c:240
 isofs_fill_super+0xaf2/0x12f0 fs/isofs/inode.c:821
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1694
 get_tree_bdev+0x1f/0x30 fs/super.c:1717
 isofs_get_tree+0x1c/0x30 fs/isofs/inode.c:1538
 vfs_get_tree+0x57/0x1d0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3758 [inline]
 do_new_mount+0x288/0x8d0 fs/namespace.c:3834
 path_mount+0x4d0/0xbc0 fs/namespace.c:4154
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4360
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4360
 x64_sys_call+0x2d61/0x3020 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888110582410 -> 0xffff8881086da068

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 25070 Comm: syz-executor.1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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