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BUG: KCSAN: data-race in prandom_seed / prandom_u32

write to 0xffff888237c28848 of 8 bytes by task 21573 on cpu 0:
 siprand_u32 lib/random32.c:372 [inline]
 prandom_u32+0x10e/0x190 lib/random32.c:387
 __ext4_new_inode+0x202b/0x2700 fs/ext4/ialloc.c:1283
 ext4_symlink+0x2ba/0x6f0 fs/ext4/namei.c:3293
 vfs_symlink+0x18a/0x280 fs/namei.c:4297
 do_symlinkat+0xe2/0x330 fs/namei.c:4326
 __do_sys_symlinkat fs/namei.c:4343 [inline]
 __se_sys_symlinkat fs/namei.c:4340 [inline]
 __x64_sys_symlinkat+0x5e/0x70 fs/namei.c:4340
 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 0xffff888237c28848 of 8 bytes by task 1916 on cpu 1:
 prandom_seed+0xbb/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: 0xfbaa91a77d457127 -> 0x2f2e28a8890c2b89

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1916 Comm: kworker/1:5 Not tainted 5.18.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
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