rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4722/1:b..l
	(detected by 1, t=10502 jiffies, g=76817, q=60 ncpus=2)
task:kworker/u4:16   state:R  running task     stack:19872 pid:4722  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x132c/0x4330 kernel/sched/core.c:6554
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6866
 irqentry_exit+0x53/0x80 kernel/entry/common.c:433
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5673
Code: 2b 00 74 08 4c 89 f7 e8 6f 9f 76 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000322f8e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000645f28 RCX: 1ffff92000645ec8
RDX: dffffc0000000000 RSI: ffffffff8aebe920 RDI: ffffffff8b3cdde0
RBP: ffffc9000322fa40 R08: dffffc0000000000 R09: fffffbfff2092e45
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000645f24
R13: dffffc0000000000 R14: ffffc9000322f940 R15: 0000000000000246
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:306
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 inet_twsk_purge+0x124/0xad0 net/ipv4/inet_timewait_sock.c:295
 ops_exit_list net/core/net_namespace.c:174 [inline]
 cleanup_net+0x763/0xb60 net/core/net_namespace.c:601
 process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2292
 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2439
 kthread+0x26e/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
rcu: rcu_preempt kthread starved for 10528 jiffies! g76817 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:25432 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x132c/0x4330 kernel/sched/core.c:6554
 schedule+0xbf/0x180 kernel/sched/core.c:6630
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935
 rcu_gp_fqs_loop+0x2c2/0x1010 kernel/rcu/tree.c:1661
 rcu_gp_kthread+0xa3/0x3a0 kernel/rcu/tree.c:1860
 kthread+0x26e/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 18920 Comm: syz-executor.3 Not tainted 6.1.43-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
RIP: 0010:__lock_acquire+0x1278/0x1f80 kernel/locking/lockdep.c:5059
Code: 24 20 44 89 f2 48 89 e9 e8 75 9f 00 00 31 f6 85 c0 0f 84 9e 02 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 44 24 50 80 3c 10 00 <48> 8b 5c 24 60 74 12 48 89 df e8 d9 88 76 00 48 ba 00 00 00 00 00
RSP: 0018:ffffc900032ff500 EFLAGS: 00000046
RAX: 1ffff11003e77c82 RBX: ffffffff90190460 RCX: ffffffff816a93e5
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff90497228
RBP: 2c8f74d744b3a04d R08: dffffc0000000000 R09: fffffbfff2092e46
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801f3be418
R13: ffff88801f3bd940 R14: 0000000000000000 R15: 1ffff11003e77c92
FS:  00007f41b5a806c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41b5a7ff80 CR3: 00000000224ae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669
 seqcount_lockdep_reader_access+0xf8/0x220 include/linux/seqlock.h:102
 timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
 ktime_get+0x7f/0x270 kernel/time/timekeeping.c:848
 clockevents_program_min_delta+0x55/0x410 kernel/time/clockevents.c:241
 hrtimer_start_range_ns+0xabd/0xc50 kernel/time/hrtimer.c:1299
 posixtimer_rearm+0x1ad/0x3f0 kernel/time/posix-timers.c:323
 dequeue_signal+0x245/0x590 kernel/signal.c:703
 get_signal+0x5f2/0x17d0 kernel/signal.c:2742
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f41b4c7cae7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007f41b5a80178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f41b4d9bf88 RCX: 00007f41b4c7cae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f41b4d9bf88
RBP: 00007f41b4d9bf80 R08: 00007f41b5a806c0 R09: 00007f41b5a806c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f41b4d9bf8c
R13: 000000000000000b R14: 00007ffd5ab40250 R15: 00007ffd5ab40338
 </TASK>