syzbot

loop4: detected capacity change from 0 to 4
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BUG: KCSAN: data-race in __dentry_kill / d_set_d_op

write to 0xffff88811b09c480 of 4 bytes by task 29920 on cpu 0:
 d_set_d_op+0x17f/0x220 fs/dcache.c:1910
 simple_lookup+0x78/0x90 fs/libfs.c:74
 __lookup_slow+0x182/0x250 fs/namei.c:1657
 lookup_slow fs/namei.c:1674 [inline]
 walk_component+0x2b6/0x360 fs/namei.c:1970
 lookup_last fs/namei.c:2425 [inline]
 path_lookupat+0x12d/0x3d0 fs/namei.c:2449
 filename_lookup+0x130/0x310 fs/namei.c:2478
 user_path_at_empty+0x3e/0x110 fs/namei.c:2801
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xa9/0x2a0 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 vfs_stat include/linux/fs.h:3353 [inline]
 __do_sys_newstat fs/stat.c:385 [inline]
 __se_sys_newstat+0x5d/0x250 fs/stat.c:381
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:381
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88811b09c480 of 4 bytes by task 29918 on cpu 1:
 dentry_unlist fs/dcache.c:547 [inline]
 __dentry_kill+0x1ef/0x450 fs/dcache.c:578
 dput+0x218/0x430 fs/dcache.c:888
 handle_mounts fs/namei.c:1502 [inline]
 step_into+0x468/0xee0 fs/namei.c:1800
 walk_component+0x1a1/0x360 fs/namei.c:1976
 lookup_last fs/namei.c:2425 [inline]
 path_lookupat+0x12d/0x3d0 fs/namei.c:2449
 filename_lookup+0x130/0x310 fs/namei.c:2478
 user_path_at_empty+0x3e/0x110 fs/namei.c:2801
 user_path_at include/linux/namei.h:57 [inline]
 vfs_statx+0xa9/0x2a0 fs/stat.c:221
 vfs_fstatat fs/stat.c:243 [inline]
 vfs_stat include/linux/fs.h:3353 [inline]
 __do_sys_newstat fs/stat.c:385 [inline]
 __se_sys_newstat+0x5d/0x250 fs/stat.c:381
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:381
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x10000000 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29918 Comm: syz-executor.4 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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