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BUG: KCSAN: data-race in touch_atime / touch_atime

write to 0xffff8881305409b0 of 8 bytes by task 9183 on cpu 1:
 inode_set_atime_to_ts include/linux/fs.h:1543 [inline]
 inode_update_timestamps fs/inode.c:1876 [inline]
 generic_update_time fs/inode.c:1898 [inline]
 inode_update_time fs/inode.c:1918 [inline]
 touch_atime+0x1ed/0x340 fs/inode.c:1990
 file_accessed include/linux/fs.h:2436 [inline]
 shmem_file_read_iter+0x4b3/0x550 mm/shmem.c:2873
 call_read_iter include/linux/fs.h:2081 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x5ab/0x6a0 fs/read_write.c:476
 ksys_read+0xeb/0x1a0 fs/read_write.c:619
 __do_sys_read fs/read_write.c:629 [inline]
 __se_sys_read fs/read_write.c:627 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:627
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881305409b0 of 8 bytes by task 9085 on cpu 0:
 inode_get_atime include/linux/fs.h:1537 [inline]
 inode_update_timestamps fs/inode.c:1873 [inline]
 generic_update_time fs/inode.c:1898 [inline]
 inode_update_time fs/inode.c:1918 [inline]
 touch_atime+0x19a/0x340 fs/inode.c:1990
 file_accessed include/linux/fs.h:2436 [inline]
 shmem_file_read_iter+0x4b3/0x550 mm/shmem.c:2873
 call_read_iter include/linux/fs.h:2081 [inline]
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x5ab/0x6a0 fs/read_write.c:476
 ksys_read+0xeb/0x1a0 fs/read_write.c:619
 __do_sys_read fs/read_write.c:629 [inline]
 __se_sys_read fs/read_write.c:627 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:627
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000000086fdb98 -> 0x000000000908ab95

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9085 Comm: udevd Not tainted 6.8.0-rc7-syzkaller-00229-g10d48d70e82d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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udevd[9085]: inotify_add_watch(7, /dev/loop4p3, 10) failed: No such file or directory