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BUG: KCSAN: data-race in ktime_get_real_seconds / timekeeping_inject_offset

write to 0xffffffff892c7df8 of 8 bytes by task 18449 on cpu 0:
 tk_xtime_add kernel/time/timekeeping.c:124 [inline]
 timekeeping_inject_offset+0x453/0x6d0 kernel/time/timekeeping.c:1295
 do_adjtimex+0x57e/0x670 kernel/time/timekeeping.c:2332
 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_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff892c7df8 of 8 bytes by task 18447 on cpu 1:
 ktime_get_real_seconds+0x11/0x20 kernel/time/timekeeping.c:939
 recently_deleted fs/ext4/ialloc.c:699 [inline]
 find_inode_bit+0x223/0x380 fs/ext4/ialloc.c:724
 __ext4_new_inode+0xc24/0x2f60 fs/ext4/ialloc.c:927
 ext4_create+0x16b/0x2d0 fs/ext4/namei.c:2616
 lookup_open fs/namei.c:3095 [inline]
 open_last_lookups fs/namei.c:3169 [inline]
 path_openat+0xcad/0x20e0 fs/namei.c:3357
 do_filp_open+0xbd/0x1d0 fs/namei.c:3387
 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 __do_sys_openat fs/open.c:1209 [inline]
 __se_sys_openat fs/open.c:1204 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1204
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18447 Comm: syz-executor.1 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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