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BUG: KCSAN: data-race in __dentry_kill / fast_dput

write to 0xffff888104badb50 of 8 bytes by task 9277 on cpu 1:
 __d_drop fs/dcache.c:516 [inline]
 __dentry_kill+0x13e/0x4c0 fs/dcache.c:608
 dput+0x5c/0xd0 fs/dcache.c:852
 handle_mounts fs/namei.c:1579 [inline]
 step_into+0x21a/0x810 fs/namei.c:1877
 walk_component+0x169/0x230 fs/namei.c:2045
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2566
 filename_lookup+0x127/0x300 fs/namei.c:2595
 do_linkat+0xc5/0x600 fs/namei.c:4742
 io_linkat+0x81/0xe0 io_uring/fs.c:279
 io_issue_sqe+0x181/0xcc0 io_uring/io_uring.c:1710
 io_wq_submit_work+0x480/0x600 io_uring/io_uring.c:1819
 io_worker_handle_work+0x486/0x9d0 io_uring/io-wq.c:600
 io_wq_worker+0x286/0x820 io_uring/io-wq.c:654
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888104badb50 of 8 bytes by task 9288 on cpu 0:
 hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
 d_unhashed include/linux/dcache.h:354 [inline]
 retain_dentry fs/dcache.c:693 [inline]
 fast_dput+0x65/0x2c0 fs/dcache.c:789
 dput+0x24/0xd0 fs/dcache.c:846
 handle_mounts fs/namei.c:1579 [inline]
 step_into+0x21a/0x810 fs/namei.c:1877
 walk_component+0x169/0x230 fs/namei.c:2045
 lookup_last fs/namei.c:2542 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2566
 filename_lookup+0x127/0x300 fs/namei.c:2595
 do_linkat+0xc5/0x600 fs/namei.c:4742
 io_linkat+0x81/0xe0 io_uring/fs.c:279
 io_issue_sqe+0x181/0xcc0 io_uring/io_uring.c:1710
 io_wq_submit_work+0x480/0x600 io_uring/io_uring.c:1819
 io_worker_handle_work+0x486/0x9d0 io_uring/io-wq.c:600
 io_wq_worker+0x286/0x820 io_uring/io-wq.c:654
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0xffff888237609950 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9288 Comm: iou-wrk-9267 Not tainted 6.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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