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

read to 0xffff888126908630 of 8 bytes by task 18357 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

write to 0xffff888126908630 of 8 bytes by task 23867 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23867 Comm: udevd Not tainted 5.4.0-rc3+ #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: 23867 Comm: udevd Not tainted 5.4.0-rc3+ #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/0x10 kernel/kcsan/report.c:302
 __kcsan_setup_watchpoint+0x32e/0x4a0 kernel/kcsan/core.c:411
 __tsan_write8 kernel/kcsan/kcsan.c:36 [inline]
 __tsan_write8+0x32/0x40 kernel/kcsan/kcsan.c:36
 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
RIP: 0033:0x7fca9568a527
Code: 32 00 64 83 38 15 74 07 b8 ff ff ff ff 5b c3 48 89 df e8 1c c1 07 00 85 c0 75 ed 31 c0 eb d3 90 90 90 90 b8 52 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 f8 32 00 31 d2 48 29 c2 64
RSP: 002b:00007ffcc61dd268 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fca9568a527
RDX: 0000000000fa0600 RSI: 00007ffcc61dd2a0 RDI: 00007ffcc61dd6a0
RBP: 0000000000fb0e80 R08: 00007fca95ffd7a0 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000fa0c70
R13: 0000000000f98250 R14: 00007ffcc61dd2a0 R15: 0000000000000001
Kernel Offset: disabled
Rebooting in 86400 seconds..