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

write to 0xffff888125314180 of 4 bytes by task 8049 on cpu 0:
 dont_mount include/linux/dcache.h:352 [inline]
 vfs_unlink+0x267/0x3e0 fs/namei.c:4075
 do_unlinkat+0x33f/0x550 fs/namei.c:4137
 __do_sys_unlink fs/namei.c:4184 [inline]
 __se_sys_unlink fs/namei.c:4182 [inline]
 __x64_sys_unlink+0x38/0x50 fs/namei.c:4182
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888125314180 of 4 bytes by task 4029 on cpu 1:
 d_is_symlink include/linux/dcache.h:419 [inline]
 vfs_readlink+0x1b3/0x250 fs/namei.c:4800
 do_readlinkat+0x200/0x230 fs/stat.c:421
 __do_sys_readlink fs/stat.c:442 [inline]
 __se_sys_readlink fs/stat.c:439 [inline]
 __x64_sys_readlink+0x4c/0x60 fs/stat.c:439
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4029 Comm: udevd Not tainted 5.6.0-rc1-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: 1 PID: 4029 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x11d/0x187 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xf kernel/kcsan/report.c:599
 kcsan_setup_watchpoint+0x3fb/0x440 kernel/kcsan/core.c:507
 d_is_symlink include/linux/dcache.h:419 [inline]
 vfs_readlink+0x1b3/0x250 fs/namei.c:4800
 do_readlinkat+0x200/0x230 fs/stat.c:421
 __do_sys_readlink fs/stat.c:442 [inline]
 __se_sys_readlink fs/stat.c:439 [inline]
 __x64_sys_readlink+0x4c/0x60 fs/stat.c:439
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f4a9cfef577
Code: f0 ff ff 77 02 f3 c3 48 8b 15 bd 38 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 90 90 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 38 2b 00 31 d2 48 29 c2 64
RSP: 002b:00007ffe8b85ae78 EFLAGS: 00000206 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 000000000159f250 RCX: 00007f4a9cfef577
RDX: 00000000000003fc RSI: 00007ffe8b85b2a4 RDI: 00007ffe8b85aea0
RBP: 00000000000003fc R08: 000000000159f0d0 R09: 00007f4a9d0441d0
R10: 0000000000000000 R11: 0000000000000206 R12: 000000000000622d
R13: 0000000000000000 R14: 00000000015a3380 R15: 000000000159f250
Kernel Offset: disabled
Rebooting in 86400 seconds..