==================================================================
BUG: KCSAN: data-race in generic_fillattr / shmem_rename2

write to 0xffff8881268709a8 of 8 bytes by task 8219 on cpu 1:
 shmem_rename2+0x14f/0x4a0 mm/shmem.c:3084
 vfs_rename+0x87d/0x10b0 fs/namei.c:4469
 do_renameat2+0x9e3/0xa50 fs/namei.c:4619
 __do_sys_rename fs/namei.c:4665 [inline]
 __se_sys_rename fs/namei.c:4663 [inline]
 __x64_sys_rename+0x47/0x60 fs/namei.c:4663
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881268709a8 of 8 bytes by task 8215 on cpu 0:
 generic_fillattr+0xf5/0x1e0 fs/stat.c:42
 vfs_getattr_nosec+0x160/0x170 fs/stat.c:84
 vfs_getattr+0x54/0x70 fs/stat.c:118
 vfs_statx+0x102/0x190 fs/stat.c:191
 vfs_stat include/linux/fs.h:3242 [inline]
 __do_sys_newstat+0x51/0xb0 fs/stat.c:341
 __se_sys_newstat fs/stat.c:337 [inline]
 __x64_sys_newstat+0x3a/0x50 fs/stat.c:337
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8215 Comm: udevd Not tainted 5.4.0-rc6+ #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: 8215 Comm: udevd Not tainted 5.4.0-rc6+ #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+0xf5/0x159 lib/dump_stack.c:113
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xe kernel/kcsan/report.c:302
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:357
 check_access kernel/kcsan/core.c:409 [inline]
 __tsan_read8+0x145/0x1f0 kernel/kcsan/core.c:530
 generic_fillattr+0xf5/0x1e0 fs/stat.c:42
 vfs_getattr_nosec+0x160/0x170 fs/stat.c:84
 vfs_getattr+0x54/0x70 fs/stat.c:118
 vfs_statx+0x102/0x190 fs/stat.c:191
 vfs_stat include/linux/fs.h:3242 [inline]
 __do_sys_newstat+0x51/0xb0 fs/stat.c:341
 __se_sys_newstat fs/stat.c:337 [inline]
 __x64_sys_newstat+0x3a/0x50 fs/stat.c:337
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f7bb1962c65
Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 90 90 90 90 90 90 90 90 83 ff 01 48 89 f0 77 18 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 17 f3 c3 90 48 8b 05 a1 51 2b 00 64 c7 00 16
RSP: 002b:00007ffc64cd2998 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00007ffc64cd2a30 RCX: 00007f7bb1962c65
RDX: 00007ffc64cd29a0 RSI: 00007ffc64cd29a0 RDI: 00007ffc64cd2a30
RBP: 0000000000a42980 R08: 00007ffc64cd2a40 R09: 00007f7bb19b8be0
R10: 6564752f6e75722f R11: 0000000000000246 R12: 0000000000a40250
R13: 0000000000000000 R14: 00007ffc64cd2ea0 R15: 0000000000000001
Kernel Offset: disabled
Rebooting in 86400 seconds..