syzbot

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BUG: KCSAN: data-race in generic_permission / setattr_copy

write to 0xffff88813f0031a0 of 2 bytes by task 24 on cpu 1:
 setattr_copy+0x25c/0x270 fs/attr.c:321
 shmem_setattr+0x531/0x840 mm/shmem.c:1221
 notify_change+0x866/0x8e0 fs/attr.c:499
 handle_remove drivers/base/devtmpfs.c:337 [inline]
 handle drivers/base/devtmpfs.c:386 [inline]
 devtmpfs_work_loop+0x828/0x8e0 drivers/base/devtmpfs.c:399
 devtmpfsd+0x43/0x50 drivers/base/devtmpfs.c:441
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff88813f0031a0 of 2 bytes by task 3191 on cpu 0:
 acl_permission_check fs/namei.c:342 [inline]
 generic_permission+0x28/0x380 fs/namei.c:408
 do_inode_permission fs/namei.c:469 [inline]
 inode_permission+0x77/0x300 fs/namei.c:529
 may_open+0x252/0x340 fs/namei.c:3268
 do_open fs/namei.c:3638 [inline]
 path_openat+0x1763/0x1d10 fs/namei.c:3797
 do_filp_open+0xf6/0x200 fs/namei.c:3824
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x6180 -> 0x6000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3191 Comm: udevd Not tainted 6.6.0-rc6-syzkaller-00285-g9c5d00cb7b6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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udevd[3191]: inotify_add_watch(7, /dev/loop0, 10) failed: No such file or directory
udevd[3191]: inotify_add_watch(7, /dev/loop0, 10) failed: No such file or directory
udevd[3191]: inotify_add_watch(7, /dev/loop0, 10) failed: No such file or directory
udevd[3191]: inotify_add_watch(7, /dev/loop0, 10) failed: No such file or directory