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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff888164f81250 of 8 bytes by task 5640 on cpu 1:
 __d_drop fs/dcache.c:575 [inline]
 __dentry_kill+0x142/0x4b0 fs/dcache.c:667
 dput+0x5e/0xd0 fs/dcache.c:911
 handle_mounts fs/namei.c:1640 [inline]
 step_into+0x5b2/0x820 fs/namei.c:1976
 walk_component+0x162/0x220 fs/namei.c:2144
 lookup_last fs/namei.c:2639 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2663
 filename_lookup+0x147/0x340 fs/namei.c:2692
 vfs_statx+0x9d/0x390 fs/stat.c:353
 do_statx+0xa6/0x100 fs/stat.c:769
 io_statx+0x7f/0xc0 io_uring/statx.c:60
 __io_issue_sqe+0xfb/0x2e0 io_uring/io_uring.c:1738
 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1761
 io_wq_submit_work+0x3f7/0x5f0 io_uring/io_uring.c:1873
 io_worker_handle_work+0x44e/0x9b0 io_uring/io-wq.c:642
 io_wq_worker+0x22e/0x870 io_uring/io-wq.c:696
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888164f81250 of 8 bytes by task 5641 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:359 [inline]
 retain_dentry fs/dcache.c:752 [inline]
 fast_dput+0x5f/0x2c0 fs/dcache.c:848
 dput+0x24/0xd0 fs/dcache.c:905
 handle_mounts fs/namei.c:1640 [inline]
 step_into+0x5b2/0x820 fs/namei.c:1976
 walk_component+0x162/0x220 fs/namei.c:2144
 lookup_last fs/namei.c:2639 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2663
 filename_lookup+0x147/0x340 fs/namei.c:2692
 vfs_statx+0x9d/0x390 fs/stat.c:353
 do_statx+0xa6/0x100 fs/stat.c:769
 io_statx+0x7f/0xc0 io_uring/statx.c:60
 __io_issue_sqe+0xfb/0x2e0 io_uring/io_uring.c:1738
 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1761
 io_wq_submit_work+0x3f7/0x5f0 io_uring/io_uring.c:1873
 io_worker_handle_work+0x44e/0x9b0 io_uring/io-wq.c:642
 io_wq_worker+0x22e/0x870 io_uring/io-wq.c:696
 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0xffff8882379266b0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5641 Comm: iou-wrk-5638 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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