syzbot

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BUG: KCSAN: data-race in generic_fillattr / shmem_symlink

write to 0xffff888102023544 of 4 bytes by task 3287 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1648 [inline]
 shmem_symlink+0x349/0x3a0 mm/shmem.c:3958
 vfs_symlink+0xca/0x1d0 fs/namei.c:4669
 do_symlinkat+0xdf/0x350 fs/namei.c:4695
 __do_sys_symlink fs/namei.c:4716 [inline]
 __se_sys_symlink fs/namei.c:4714 [inline]
 __x64_sys_symlink+0x50/0x60 fs/namei.c:4714
 x64_sys_call+0x28b0/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:89
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888102023544 of 4 bytes by task 3752 on cpu 0:
 inode_get_mtime_nsec include/linux/fs.h:1634 [inline]
 inode_get_mtime include/linux/fs.h:1640 [inline]
 generic_fillattr+0x205/0x330 fs/stat.c:102
 shmem_getattr+0x17b/0x200 mm/shmem.c:1177
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr fs/stat.c:246 [inline]
 vfs_statx_path+0x171/0x2d0 fs/stat.c:283
 vfs_statx+0xe1/0x170 fs/stat.c:347
 vfs_fstatat fs/stat.c:366 [inline]
 __do_sys_newfstatat fs/stat.c:530 [inline]
 __se_sys_newfstatat+0xdc/0x300 fs/stat.c:524
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:524
 x64_sys_call+0x236d/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x36945445 -> 0x39de29c8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3752 Comm: udevd Not tainted 6.13.0-rc2-syzkaller-00018-g7cb1b4663150 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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udevd[3752]: inotify_add_watch(7, /dev/loop2p1, 10) failed: No such file or directory
udevd[3752]: inotify_add_watch(7, /dev/loop2p2, 10) failed: No such file or directory