rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5967/1:b..l
	(detected by 0, t=10502 jiffies, g=25933, q=43 ncpus=2)
task:kworker/u4:16   state:R  running task     stack:27872 pid:5967  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5178 [inline]
 __schedule+0xadf/0x5270 kernel/sched/core.c:6490
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6802
 irqentry_exit+0x31/0x80 kernel/entry/common.c:428
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:200
Code: 81 e1 00 01 00 00 65 48 8b 14 25 80 6f 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 bc 15 00 00 85 c0 74 2b 8b 82 98 15 00 00 <83> f8 02 75 20 48 8b 8a a0 15 00 00 8b 92 9c 15 00 00 48 8b 01 48
RSP: 0018:ffffc90005447b38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000001c380 RCX: 0000000000000000
RDX: ffff88803f782140 RSI: ffffffff87dc8a19 RDI: 0000000000000006
RBP: 000000000001c380 R08: 0000000000000006 R09: 000000000001c380
R10: 000000000001c380 R11: 1ffff1100f84d49a R12: ffffffff8daa3e40
R13: ffffc90005447ca0 R14: 000000000000000a R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:767 [inline]
 inet_twsk_purge+0x4c9/0x7d0 net/ipv4/inet_timewait_sock.c:299
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10208 jiffies! g25933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=14495
rcu: rcu_preempt kthread starved for 10209 jiffies! g25933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:I stack:29408 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5178 [inline]
 __schedule+0xadf/0x5270 kernel/sched/core.c:6490
 schedule+0xda/0x1b0 kernel/sched/core.c:6566
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1658
 rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1857
 kthread+0x2e4/0x3a0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3635 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:debug_object_deactivate+0x4/0x300 lib/debugobjects.c:721
Code: 48 89 cf 48 89 54 24 18 48 89 4c 24 10 e8 94 d6 c3 fd 48 8b 54 24 18 48 8b 4c 24 10 e9 e2 f4 ff ff 0f 1f 44 00 00 41 57 41 56 <41> 55 41 54 49 bc 00 00 00 00 00 fc ff df 55 53 48 81 ec b0 00 00
RSP: 0018:ffffc900003f8e28 EFLAGS: 00000046
RAX: 0000000080010002 RBX: ffff88801c75a340 RCX: 0000000000000000
RDX: ffff88803223c180 RSI: ffffffff89eef620 RDI: ffff88801c75a340
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 171e2ce61a190000
R13: ffff8880b9b2a640 R14: ffff8880b9b2a540 R15: 0000000000000001
FS:  0000555556029400(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcf89effa8 CR3: 000000003291c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline]
 debug_deactivate kernel/time/hrtimer.c:481 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1653 [inline]
 __hrtimer_run_queues+0x3f3/0xe40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1113
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1107
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x46e/0x570 kernel/locking/lockdep.c:5639
Code: e8 f9 74 a2 ff e9 3a fc ff ff 65 ff 05 4b 6f a4 7e 48 c7 c0 20 d0 ca 8d 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 <0f> 85 af 00 00 00 48 8b 05 05 d0 6c 0c e8 f0 0b 06 00 85 c0 74 17
RSP: 0018:ffffc90003557ca8 EFLAGS: 00000246
RAX: 1ffffffff1b95a04 RBX: 1ffff920006aaf97 RCX: ffffffff815dfc58
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff8de01c90
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8de01c97
R10: fffffbfff1bc0392 R11: 000000000008c07d R12: 0000000000000001
R13: 0000000000000000 R14: ffff888078d902e8 R15: 0000000000000000
 __might_fault mm/memory.c:5583 [inline]
 __might_fault+0x104/0x170 mm/memory.c:5576
 strncpy_from_user+0x2f/0x3c0 lib/strncpy_from_user.c:117
 getname_flags.part.0+0x95/0x4f0 fs/namei.c:150
 getname_flags+0x9a/0xe0 include/linux/audit.h:320
 user_path_at_empty+0x2b/0x60 fs/namei.c:2875
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1822 [inline]
 __do_sys_umount fs/namespace.c:1830 [inline]
 __se_sys_umount fs/namespace.c:1828 [inline]
 __x64_sys_umount+0xf8/0x180 fs/namespace.c:1828
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f78f3c8ca17
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcf89f0778 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f78f3c8ca17
RDX: 00007ffcf89f0850 RSI: 000000000000000a RDI: 00007ffcf89f0840
RBP: 00007ffcf89f0840 R08: 00000000ffffffff R09: 00007ffcf89f0610
R10: 000055555602a8e3 R11: 0000000000000246 R12: 00007f78f3ce55f6
R13: 00007ffcf89f1900 R14: 000055555602a810 R15: 00007ffcf89f1940
 </TASK>