syzbot

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BUG: KCSAN: data-race in generic_fillattr / touch_atime

write to 0xffff88811b19faf8 of 8 bytes by task 3695 on cpu 1:
 inode_set_atime_to_ts include/linux/fs.h:1623 [inline]
 inode_update_timestamps fs/inode.c:2129 [inline]
 generic_update_time fs/inode.c:2151 [inline]
 inode_update_time fs/inode.c:2171 [inline]
 touch_atime+0x1d2/0x340 fs/inode.c:2243
 file_accessed include/linux/fs.h:2254 [inline]
 iterate_dir+0x28b/0x330 fs/readdir.c:111
 __do_sys_getdents64 fs/readdir.c:410 [inline]
 __se_sys_getdents64+0xd2/0x230 fs/readdir.c:396
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:396
 x64_sys_call+0x2f27/0x3000 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b19faf8 of 8 bytes by task 4032 on cpu 0:
 inode_get_atime_sec include/linux/fs.h:1604 [inline]
 inode_get_atime include/linux/fs.h:1614 [inline]
 generic_fillattr+0x165/0x340 fs/stat.c:96
 shmem_getattr+0x181/0x200 mm/shmem.c:1274
 vfs_getattr_nosec+0x146/0x1e0 fs/stat.c:213
 vfs_getattr fs/stat.c:262 [inline]
 vfs_fstat fs/stat.c:281 [inline]
 __do_sys_newfstat fs/stat.c:555 [inline]
 __se_sys_newfstat+0x96/0x460 fs/stat.c:550
 __x64_sys_newfstat+0x31/0x40 fs/stat.c:550
 x64_sys_call+0x2c51/0x3000 arch/x86/include/generated/asm/syscalls_64.h:6
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000696c59f9 -> 0x00000000696c59fa

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 4032 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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