syzbot

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BUG: KCSAN: data-race in do_settimeofday64 / ktime_get_real_seconds

write to 0xffffffff883144f8 of 8 bytes by task 22324 on cpu 1:
 tk_set_xtime kernel/time/timekeeping.c:138 [inline]
 do_settimeofday64+0x3eb/0x580 kernel/time/timekeeping.c:1318
 do_sys_settimeofday64+0x17b/0x1a0 kernel/time/time.c:195
 posix_clock_realtime_set+0x13/0x20 kernel/time/posix-timers.c:185
 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline]
 __x64_sys_clock_settime+0x136/0x160 kernel/time/posix-timers.c:1067
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff883144f8 of 8 bytes by task 22320 on cpu 0:
 ktime_get_real_seconds+0x11/0x20 kernel/time/timekeeping.c:1008
 recently_deleted fs/ext4/ialloc.c:703 [inline]
 find_inode_bit+0x231/0x3a0 fs/ext4/ialloc.c:728
 __ext4_new_inode+0xb52/0x3020 fs/ext4/ialloc.c:1062
 ext4_symlink+0x2c2/0x780 fs/ext4/namei.c:3336
 vfs_symlink+0x216/0x2d0 fs/namei.c:3962
 do_symlinkat+0xee/0x280 fs/namei.c:3989
 __do_sys_symlink fs/namei.c:4008 [inline]
 __se_sys_symlink fs/namei.c:4006 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4006
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22320 Comm: syz-executor.2 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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