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

read to 0xffff8881269d6c38 of 16 bytes by task 8180 on cpu 1:
 generic_fillattr+0x145/0x1e0 fs/stat.c:44
 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 0xffff8881269d6c38 of 16 bytes by task 8303 on cpu 0:
 shmem_rename2+0x193/0x4a0 mm/shmem.c:3087
 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: 0 PID: 8303 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: 8303 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_unaligned_write16+0x143/0x1f0 kernel/kcsan/core.c:531
 shmem_rename2+0x193/0x4a0 mm/shmem.c:3087
 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: 0033:0x7f6949001527
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:00007fff188c2358 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00000000017803c0 RCX: 00007f6949001527
RDX: 00000000017803d0 RSI: 00007fff188c2390 RDI: 00007fff188c2790
RBP: 0000000001798e80 R08: 00007f69499747a0 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000001790ac0
R13: 0000000001780250 R14: 00007fff188c2390 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..