==================================================================
BUG: KCSAN: data-race in vfs_readlink / vfs_unlink

read-write to 0xffff888130128240 of 4 bytes by task 11525 on cpu 1:
 dont_mount include/linux/dcache.h:355 [inline]
 vfs_unlink+0x269/0x3b0 fs/namei.c:3837
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3899
 __do_sys_unlink fs/namei.c:3945 [inline]
 __se_sys_unlink fs/namei.c:3943 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3943
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888130128240 of 4 bytes by task 4889 on cpu 0:
 __d_entry_type include/linux/dcache.h:392 [inline]
 d_is_symlink include/linux/dcache.h:422 [inline]
 vfs_readlink+0x1c1/0x250 fs/namei.c:4548
 do_readlinkat+0x170/0x200 fs/stat.c:419
 __do_sys_readlink fs/stat.c:440 [inline]
 __se_sys_readlink fs/stat.c:437 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:437
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4889 Comm: systemd-udevd Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 4889 Comm: systemd-udevd Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x116/0x15d lib/dump_stack.c:120
 panic+0x1e7/0x5fa kernel/panic.c:231
 kcsan_report+0x67b/0x680 kernel/kcsan/report.c:634
 kcsan_setup_watchpoint+0x47b/0x4e0 kernel/kcsan/core.c:568
 __d_entry_type include/linux/dcache.h:392 [inline]
 d_is_symlink include/linux/dcache.h:422 [inline]
 vfs_readlink+0x1c1/0x250 fs/namei.c:4548
 do_readlinkat+0x170/0x200 fs/stat.c:419
 __do_sys_readlink fs/stat.c:440 [inline]
 __se_sys_readlink fs/stat.c:437 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:437
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f1084901087
Code: 73 01 c3 48 8b 0d 11 be 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe4a0b1928 EFLAGS: 00000293 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffe4a0b19c0 RCX: 00007f1084901087
RDX: 0000000000000200 RSI: 00007ffe4a0b1ad0 RDI: 00007ffe4a0b19a0
RBP: 00007ffe4a0b1f28 R08: 0000000000000001 R09: 0000000000000013
R10: 0000000000000064 R11: 0000000000000293 R12: 00007ffe4a0b1ad0
R13: 000055f7842b0010 R14: 000055f7842b00e0 R15: 00007ffe4a0b19a0
Kernel Offset: disabled
Rebooting in 86400 seconds..