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BUG: KCSAN: data-race in ktime_get_real_seconds / timekeeping_inject_offset

write to 0xffffffff8417c978 of 8 bytes by task 7627 on cpu 1:
 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 0xffffffff8417c978 of 8 bytes by task 7629 on cpu 0:
 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_create+0x17c/0x310 fs/ext4/namei.c:2738
 lookup_open fs/namei.c:3228 [inline]
 open_last_lookups fs/namei.c:3298 [inline]
 path_openat+0xcd1/0x1f20 fs/namei.c:3504
 do_filp_open+0xe9/0x200 fs/namei.c:3534
 do_sys_openat2+0xa3/0x250 fs/open.c:1204
 do_sys_open fs/open.c:1220 [inline]
 __do_sys_creat fs/open.c:1294 [inline]
 __se_sys_creat fs/open.c:1288 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1288
 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: 0x0000000060ecac29 -> 0x0000000060ecac2a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7629 Comm: syz-executor.5 Not tainted 5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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