==================================================================
BUG: KCSAN: data-race in prandom_seed / prandom_u32

write to 0xffff888237d28850 of 8 bytes by task 1814 on cpu 1:
 siprand_u32 lib/random32.c:372 [inline]
 prandom_u32+0x11f/0x190 lib/random32.c:387
 shmem_get_inode+0x2d4/0x6e0 mm/shmem.c:2267
 shmem_symlink+0x89/0x420 mm/shmem.c:3033
 vfs_symlink+0x18a/0x280 fs/namei.c:4297
 do_symlinkat+0xe2/0x330 fs/namei.c:4326
 __do_sys_symlink fs/namei.c:4348 [inline]
 __se_sys_symlink fs/namei.c:4346 [inline]
 __x64_sys_symlink+0x52/0x60 fs/namei.c:4346
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d28850 of 8 bytes by task 2020 on cpu 0:
 prandom_seed+0xd3/0x270 lib/random32.c:439
 addrconf_dad_begin net/ipv6/addrconf.c:3975 [inline]
 addrconf_dad_work+0x265/0xbb0 net/ipv6/addrconf.c:4100
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

value changed: 0x5b13c7e986a5e269 -> 0xdc57d6d7d117ac8f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2020 Comm: kworker/0:6 Not tainted 5.18.0-rc5-syzkaller-00178-g30c8e80f7932-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
==================================================================