syzbot

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BUG: KCSAN: data-race in generic_permission / setattr_copy

write to 0xffff888101fe4080 of 2 bytes by task 26 on cpu 0:
 setattr_copy+0x18c/0x4a0 fs/attr.c:352
 shmem_setattr+0x532/0x830 mm/shmem.c:1262
 notify_change+0x85c/0x8e0 fs/attr.c:552
 handle_remove drivers/base/devtmpfs.c:337 [inline]
 handle drivers/base/devtmpfs.c:386 [inline]
 devtmpfs_work_loop+0x841/0x8f0 drivers/base/devtmpfs.c:399
 devtmpfsd+0x47/0x50 drivers/base/devtmpfs.c:441
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888101fe4080 of 2 bytes by task 14797 on cpu 1:
 acl_permission_check fs/namei.c:383 [inline]
 generic_permission+0x29/0x460 fs/namei.c:471
 do_inode_permission fs/namei.c:532 [inline]
 inode_permission+0x77/0x300 fs/namei.c:592
 path_permission include/linux/fs.h:2937 [inline]
 inotify_find_inode fs/notify/inotify/inotify_user.c:381 [inline]
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:771 [inline]
 __se_sys_inotify_add_watch+0x17c/0x790 fs/notify/inotify/inotify_user.c:729
 __x64_sys_inotify_add_watch+0x43/0x50 fs/notify/inotify/inotify_user.c:729
 x64_sys_call+0x1f6d/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:255
 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: 0x61b0 -> 0x6000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14797 Comm: udevd Not tainted 6.13.0-rc6-syzkaller-00231-g77a903cd8e5a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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