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BUG: KCSAN: data-race in ktime_get_real_seconds / timekeeping_inject_offset

write to 0xffffffff8417d978 of 8 bytes by task 1665 on cpu 0:
 tk_xtime_add kernel/time/timekeeping.c:144 [inline]
 timekeeping_inject_offset+0x44e/0x820 kernel/time/timekeeping.c:1365
 do_adjtimex+0x581/0x670 kernel/time/timekeeping.c:2406
 posix_clock_realtime_adj+0x11/0x20 kernel/time/posix-timers.c:191
 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1121 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1112 [inline]
 __x64_sys_clock_adjtime+0x12c/0x1b0 kernel/time/posix-timers.c:1112
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8417d978 of 8 bytes by task 20726 on cpu 1:
 ktime_get_real_seconds+0x11/0x20 kernel/time/timekeeping.c:1008
 recently_deleted fs/ext4/ialloc.c:704 [inline]
 find_inode_bit+0x1f9/0x330 fs/ext4/ialloc.c:729
 __ext4_new_inode+0xc7a/0x2f70 fs/ext4/ialloc.c:1064
 ext4_mknod+0x18c/0x320 fs/ext4/namei.c:2773
 vfs_mknod+0x2da/0x3a0 fs/namei.c:3704
 do_mknodat+0x219/0x320 fs/namei.c:3760
 __do_sys_mknod fs/namei.c:3785 [inline]
 __se_sys_mknod fs/namei.c:3783 [inline]
 __x64_sys_mknod+0x41/0x50 fs/namei.c:3783
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000060f979e2 -> 0x0000000060f979e1

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20726 Comm: syz-executor.3 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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