syzbot

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BUG: KCSAN: data-race in shrink_dentry_list / step_into

read-write to 0xffff888122a4ed80 of 4 bytes by task 19290 on cpu 1:
 d_shrink_del fs/dcache.c:448 [inline]
 shrink_dentry_list+0x16f/0x380 fs/dcache.c:1197
 shrink_dcache_sb+0x16d/0x2b0 fs/dcache.c:1321
 reconfigure_super+0x444/0x540 fs/super.c:917
 do_remount fs/namespace.c:2702 [inline]
 path_mount+0xa8d/0xb70 fs/namespace.c:3362
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x281/0x2d0 fs/namespace.c:3568
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888122a4ed80 of 4 bytes by task 19293 on cpu 0:
 __d_entry_type include/linux/dcache.h:385 [inline]
 d_is_symlink include/linux/dcache.h:415 [inline]
 step_into+0x121/0x7d0 fs/namei.c:1836
 walk_component fs/namei.c:1999 [inline]
 link_path_walk+0x53e/0x8a0 fs/namei.c:2320
 path_openat+0x19c/0x1b00 fs/namei.c:3709
 do_filp_open+0x105/0x220 fs/namei.c:3740
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_openat fs/open.c:1342 [inline]
 __se_sys_openat fs/open.c:1337 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00680400 -> 0x00008000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19293 Comm: modprobe Not tainted 6.1.0-rc2-syzkaller-00061-g337a0a0b63f1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
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