syzbot

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BUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_current

write to 0xffff88810377e730 of 8 bytes by task 3323 on cpu 1:
 inode_set_ctime_to_ts include/linux/fs.h:1626 [inline]
 inode_set_ctime_current+0x38/0x50 fs/inode.c:2515
 shmem_mknod+0x117/0x180 mm/shmem.c:3286
 shmem_create+0x34/0x40 mm/shmem.c:3340
 lookup_open fs/namei.c:3497 [inline]
 open_last_lookups fs/namei.c:3566 [inline]
 path_openat+0xdde/0x1d80 fs/namei.c:3796
 do_filp_open+0xf7/0x200 fs/namei.c:3826
 do_sys_openat2+0xab/0x120 fs/open.c:1406
 do_sys_open fs/open.c:1421 [inline]
 __do_sys_openat fs/open.c:1437 [inline]
 __se_sys_openat fs/open.c:1432 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1432
 x64_sys_call+0x2cad/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:258
 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+0x77/0x7f

read to 0xffff88810377e730 of 8 bytes by task 3079 on cpu 0:
 inode_get_ctime include/linux/fs.h:1620 [inline]
 generic_fillattr+0x1e0/0x2f0 fs/stat.c:62
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x19b/0x1e0 fs/stat.c:176
 vfs_statx+0x140/0x320 fs/stat.c:248
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:462
 x64_sys_call+0x25ff/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:263
 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+0x77/0x7f

value changed: 0x0000000021377444 -> 0x0000000021d00ac4

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3079 Comm: udevd Not tainted 6.9.0-rc7-syzkaller-00136-gf4345f05c0df #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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