loop1: p2 p3 p7
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BUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_to_ts

write to 0xffff8881053700f8 of 4 bytes by task 4493 on cpu 0:
 inode_set_ctime_to_ts+0x84/0x170 fs/inode.c:2745
 setattr_copy+0x3df/0x4a0 fs/attr.c:358
 shmem_setattr+0x5b4/0x7c0 mm/shmem.c:1357
 notify_change+0x872/0x8f0 fs/attr.c:546
 chmod_common+0x138/0x270 fs/open.c:647
 do_fchmodat+0xcd/0x180 fs/open.c:694
 __do_sys_chmod fs/open.c:718 [inline]
 __se_sys_chmod fs/open.c:716 [inline]
 __x64_sys_chmod+0x38/0x50 fs/open.c:716
 x64_sys_call+0x2aaf/0x3000 arch/x86/include/generated/asm/syscalls_64.h:91
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881053700f8 of 4 bytes by task 5280 on cpu 1:
 inode_get_ctime_nsec include/linux/fs.h:1688 [inline]
 inode_get_ctime include/linux/fs.h:1694 [inline]
 generic_fillattr+0x1d1/0x340 fs/stat.c:101
 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_statx_path fs/stat.c:299 [inline]
 vfs_statx+0x113/0x390 fs/stat.c:356
 vfs_fstatat+0x115/0x170 fs/stat.c:375
 __do_sys_newfstatat fs/stat.c:542 [inline]
 __se_sys_newfstatat+0x55/0x260 fs/stat.c:536
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:536
 x64_sys_call+0x111f/0x3000 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x134a24d9 -> 0x1625ab35

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5280 Comm: syz.1.541 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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