syzbot

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BUG: KCSAN: data-race in do_settimeofday64 / ktime_get_real_seconds

write to 0xffffffff841669b8 of 8 bytes by task 11514 on cpu 0:
 tk_set_xtime kernel/time/timekeeping.c:138 [inline]
 do_settimeofday64+0x404/0x5a0 kernel/time/timekeeping.c:1319
 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+0x163/0x190 kernel/time/posix-timers.c:1067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff841669b8 of 8 bytes by task 11513 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+0xc9a/0x2fd0 fs/ext4/ialloc.c:1066
 ext4_symlink+0x2cc/0x700 fs/ext4/namei.c:3293
 vfs_symlink+0x23f/0x350 fs/namei.c:4250
 do_symlinkat+0x104/0x380 fs/namei.c:4279
 __do_sys_symlink fs/namei.c:4301 [inline]
 __se_sys_symlink fs/namei.c:4299 [inline]
 __x64_sys_symlink+0x52/0x60 fs/namei.c:4299
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000061679e16 -> 0x0000000077359400

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11513 Comm: syz-executor.2 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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