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BUG: KCSAN: data-race in do_settimeofday64 / ktime_get_real_seconds

write to 0xffffffff8454f938 of 8 bytes by task 28166 on cpu 0:
 tk_set_xtime kernel/time/timekeeping.c:138 [inline]
 do_settimeofday64+0x3eb/0x580 kernel/time/timekeeping.c:1319
 __do_sys_stime32 kernel/time/time.c:133 [inline]
 __se_sys_stime32 kernel/time/time.c:119 [inline]
 __ia32_sys_stime32+0x89/0xc0 kernel/time/time.c:119
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 do_int80_syscall_32+0x4d/0x90 arch/x86/entry/common.c:96
 entry_INT80_compat+0x71/0x76 arch/x86/entry/entry_64_compat.S:413

read to 0xffffffff8454f938 of 8 bytes by task 28171 on cpu 1:
 ktime_get_real_seconds+0x11/0x20 kernel/time/timekeeping.c:1008
 recently_deleted fs/ext4/ialloc.c:703 [inline]
 find_inode_bit+0x1f9/0x330 fs/ext4/ialloc.c:728
 __ext4_new_inode+0xc7a/0x2f70 fs/ext4/ialloc.c:1063
 ext4_symlink+0x2c3/0x700 fs/ext4/namei.c:3463
 vfs_symlink+0x23a/0x300 fs/namei.c:4172
 do_symlinkat+0xeb/0x280 fs/namei.c:4202
 __do_sys_symlink fs/namei.c:4223 [inline]
 __se_sys_symlink fs/namei.c:4221 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4221
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28171 Comm: syz-executor.1 Not tainted 5.13.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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