INFO: task syz-executor:9880 blocked for more than 143 seconds.
      Not tainted 6.15.0-syzkaller-07774-g90b83efa6701 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24008 pid:9880  tgid:9880  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6781
 __schedule_loop kernel/sched/core.c:6859 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6874
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6931
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:746
 register_nexthop_notifier+0x80/0x210 net/ipv4/nexthop.c:3929
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:138
 setup_net+0x219/0x4b0 net/core/net_namespace.c:442
 copy_net_ns+0x32e/0x590 net/core/net_namespace.c:574
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3390
 __do_sys_unshare kernel/fork.c:3461 [inline]
 __se_sys_unshare kernel/fork.c:3459 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3459
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66add90167
RSP: 002b:00007ffe5a929af8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f66adfb5f40 RCX: 00007f66add90167
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000