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BUG: KCSAN: data-race in device_del / mm_update_next_owner

write to 0xffff88812bc2002c of 4 bytes by task 1795 on cpu 0:
 memalloc_noio_save include/linux/sched/mm.h:214 [inline]
 device_del+0x123/0x8f0 drivers/base/core.c:3479
 netdev_unregister_kobject+0xec/0x100 net/core/net-sysfs.c:1921
 unregister_netdevice_many+0xbb4/0xf50 net/core/dev.c:11033
 default_device_exit_batch+0x237/0x260 net/core/dev.c:11536
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x4dc/0x900 net/core/net_namespace.c:595
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2275
 worker_thread+0x636/0xae0 kernel/workqueue.c:2421
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88812bc2002c of 4 bytes by task 10125 on cpu 1:
 mm_update_next_owner+0x1d9/0x520 kernel/exit.c:389
 exit_mm+0x358/0x450 kernel/exit.c:501
 do_exit+0x3ff/0x1560 kernel/exit.c:813
 do_group_exit+0x19b/0x1a0 kernel/exit.c:923
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:934
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:932
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:932
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10125 Comm: syz-executor.2 Tainted: G        W         5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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