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

read-write to 0xffff888237c2b990 of 8 bytes by task 11609 on cpu 0:
 bh_lru_install fs/buffer.c:1340 [inline]
 __find_get_block+0x438/0x8c0 fs/buffer.c:1403
 bdev_getblk+0x34/0x420 fs/buffer.c:1423
 __getblk include/linux/buffer_head.h:355 [inline]
 sb_getblk include/linux/buffer_head.h:361 [inline]
 __ext4_get_inode_loc+0x30f/0x8f0 fs/ext4/inode.c:4369
 ext4_get_inode_loc fs/ext4/inode.c:4497 [inline]
 ext4_reserve_inode_write+0xb0/0x200 fs/ext4/inode.c:5728
 __ext4_mark_inode_dirty+0x8e/0x440 fs/ext4/inode.c:5905
 ext4_ext_tree_init+0x98/0xb0 fs/ext4/extents.c:879
 __ext4_new_inode+0x204b/0x2270 fs/ext4/ialloc.c:1335
 ext4_symlink+0x242/0x5a0 fs/ext4/namei.c:3395
 vfs_symlink+0xca/0x1b0 fs/namei.c:4481
 do_symlinkat+0xe3/0x350 fs/namei.c:4507
 __do_sys_symlinkat fs/namei.c:4523 [inline]
 __se_sys_symlinkat fs/namei.c:4520 [inline]
 __x64_sys_symlinkat+0x62/0x70 fs/namei.c:4520
 x64_sys_call+0x2a2d/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:267
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237c2b990 of 8 bytes by task 10924 on cpu 1:
 has_bh_in_lru+0x35/0x1f0 fs/buffer.c:1510
 smp_call_function_many_cond+0x2f6/0xc50 kernel/smp.c:808
 on_each_cpu_cond_mask+0x3c/0x90 kernel/smp.c:1023
 on_each_cpu_cond include/linux/smp.h:105 [inline]
 invalidate_bh_lrus+0x2a/0x30 fs/buffer.c:1519
 kill_bdev block/bdev.c:84 [inline]
 blkdev_flush_mapping+0xb8/0x1c0 block/bdev.c:644
 blkdev_put_whole block/bdev.c:675 [inline]
 bdev_release+0x2f4/0x410 block/bdev.c:1066
 blkdev_release+0x15/0x20 block/fops.c:628
 __fput+0x2c1/0x660 fs/file_table.c:422
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/0x1a0 kernel/task_work.c:180
 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+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000000 -> 0xffff888106822a90

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10924 Comm: syz-executor.4 Tainted: G        W          6.9.0-rc3-syzkaller-00365-g399f4dae683a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
==================================================================
EXT4-fs (loop4): unmounting filesystem 00000000-0000-0000-0000-000000d40000.
EXT4-fs (loop4): unmounting filesystem 00000000-0000-0000-0000-000000000000.
syz-executor.4 (10924) used greatest stack depth: 9368 bytes left