syzbot

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BUG: KCSAN: data-race in inode_needs_update_time / inode_update_timestamps

write to 0xffff888106ffd8e0 of 8 bytes by task 24255 on cpu 1:
 inode_set_ctime_to_ts include/linux/fs.h:1601 [inline]
 inode_set_ctime include/linux/fs.h:1619 [inline]
 inode_set_ctime_current fs/inode.c:2512 [inline]
 inode_update_timestamps+0x30f/0x560 fs/inode.c:1859
 generic_update_time fs/inode.c:1898 [inline]
 inode_update_time fs/inode.c:1918 [inline]
 __file_update_time fs/inode.c:2106 [inline]
 file_update_time+0xba/0x140 fs/inode.c:2136
 pipe_write+0xa81/0xd20 fs/pipe.c:617
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x760/0x8d0 fs/read_write.c:590
 ksys_write+0xeb/0x1a0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888106ffd8e0 of 8 bytes by task 24240 on cpu 0:
 inode_get_ctime include/linux/fs.h:1595 [inline]
 inode_needs_update_time+0x223/0x2f0 fs/inode.c:2089
 file_update_time+0x2d/0x140 fs/inode.c:2132
 pipe_write+0xa81/0xd20 fs/pipe.c:617
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x760/0x8d0 fs/read_write.c:590
 ksys_write+0xeb/0x1a0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000000041ca66e -> 0x00000000362e085c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24240 Comm: syz-executor.5 Not tainted 6.8.0-rc1-syzkaller-00049-g6098d87eaf31 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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