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BUG: KCSAN: data-race in ktime_get_real_seconds / timekeeping_inject_offset

write to 0xffffffff8416e978 of 8 bytes by task 1677 on cpu 0:
 tk_xtime_add kernel/time/timekeeping.c:144 [inline]
 timekeeping_inject_offset+0x44e/0x830 kernel/time/timekeeping.c:1365
 do_adjtimex+0x581/0x670 kernel/time/timekeeping.c:2409
 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 0xffffffff8416e978 of 8 bytes by task 19845 on cpu 1:
 ktime_get_real_seconds+0x11/0x20 kernel/time/timekeeping.c:1008
 recently_deleted fs/ext4/ialloc.c:706 [inline]
 find_inode_bit+0x1f9/0x330 fs/ext4/ialloc.c:731
 __ext4_new_inode+0xc7a/0x2f90 fs/ext4/ialloc.c:1066
 ext4_symlink+0x2c3/0x700 fs/ext4/namei.c:3293
 vfs_symlink+0x23f/0x350 fs/namei.c:4248
 do_symlinkat+0xe2/0x360 fs/namei.c:4277
 __do_sys_symlink fs/namei.c:4299 [inline]
 __se_sys_symlink fs/namei.c:4297 [inline]
 __x64_sys_symlink+0x52/0x60 fs/namei.c:4297
 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: 0x000000006133476e -> 0x0000000061334768

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19845 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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