rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15849
	(detected by 1, t=10503 jiffies, g=394513, q=36438 ncpus=2)
task:syz-executor.1  state:R  running task     stack:27016 pid:15849 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0xb8a/0x5450 kernel/sched/core.c:6555
 preempt_schedule_irq+0x52/0xa0 kernel/sched/core.c:6867
 irqentry_exit+0x35/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:rcu_is_watching+0x5/0xb0 kernel/rcu/tree.c:709
Code: b6 0f 1f 40 00 f3 0f 1e fa 48 c7 c7 60 ce 4d 8a e8 90 44 9b 08 65 8a 05 35 95 99 7e 0f b6 c0 c3 0f 1f 44 00 00 f3 0f 1e fa 55 <53> 65 ff 05 7b 7b 99 7e e8 4e 44 9b 08 48 c7 c3 28 60 03 00 83 f8
RSP: 0018:ffffc900034dfa68 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc900034dfb18 RCX: 0000000000000000
RDX: ffff8880aafd8080 RSI: ffffffff89bbc813 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000094001 R12: ffff888075f62000
R13: 0000000000000000 R14: ffffffffffffffff R15: 0000000000000004
 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
 rcu_read_lock_held+0x1c/0x50 kernel/rcu/update.c:309
 xa_entry include/linux/xarray.h:1198 [inline]
 xas_find_marked+0xa58/0x10b0 lib/xarray.c:1349
 xa_find+0x13d/0x330 lib/xarray.c:2022
 devlinks_xa_find_get.constprop.0+0x93/0x260 net/core/devlink.c:306
 devlinks_xa_find_get_first net/core/devlink.c:334 [inline]
 devlink_pernet_pre_exit+0x8a/0x1d0 net/core/devlink.c:12997
 ops_pre_exit_list net/core/net_namespace.c:159 [inline]
 setup_net+0x90b/0xe60 net/core/net_namespace.c:350
 copy_net_ns+0x31b/0x6b0 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc5/0x1f0 kernel/nsproxy.c:228
 ksys_unshare+0x449/0x920 kernel/fork.c:3202
 __do_sys_unshare kernel/fork.c:3273 [inline]
 __se_sys_unshare kernel/fork.c:3271 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3271
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2be368d667
RSP: 002b:00007ffea3883188 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ffea38837c8 RCX: 00007f2be368d667
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 00007ffea3883260 R14: 00007f2be37ac9d8 R15: 000000000000000c
 </TASK>