syzbot

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BUG: KCSAN: data-race in atime_needs_update / touch_atime

write to 0xffff888137f93820 of 8 bytes by task 3335 on cpu 1:
 inode_update_timestamps fs/inode.c:1907 [inline]
 generic_update_time fs/inode.c:1929 [inline]
 inode_update_time fs/inode.c:1949 [inline]
 touch_atime+0x31f/0x4a0 fs/inode.c:2020
 do_readlinkat+0x164/0x210 fs/stat.c:538
 __do_sys_readlink fs/stat.c:560 [inline]
 __se_sys_readlink fs/stat.c:557 [inline]
 __x64_sys_readlink+0x47/0x50 fs/stat.c:557
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888137f93820 of 8 bytes by task 5731 on cpu 0:
 timespec64_compare include/linux/time64.h:63 [inline]
 relatime_need_update fs/inode.c:1847 [inline]
 atime_needs_update+0x4fe/0x5b0 fs/inode.c:1989
 touch_atime+0x58/0x4a0 fs/inode.c:2003
 do_readlinkat+0x164/0x210 fs/stat.c:538
 __do_sys_readlink fs/stat.c:560 [inline]
 __se_sys_readlink fs/stat.c:557 [inline]
 __x64_sys_readlink+0x47/0x50 fs/stat.c:557
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000001aebc9cf -> 0x000000001b84604f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5731 Comm: udevd Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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I/O error, dev loop3, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop3, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop3, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop5, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2