rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3676/1:b..l
	(detected by 1, t=10503 jiffies, g=13793, q=88)
task:kworker/u4:7    state:R  running task     stack:23960 pid: 3676 ppid:     2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_cmp8+0x78/0x80 kernel/kcov.c:274
Code: c1 e1 05 48 8d 41 28 4c 39 c8 77 1e 48 c7 44 11 08 06 00 00 00 48 89 7c 11 10 48 89 74 11 18 4c 89 44 11 20 49 ff c2 4c 89 12 <c3> 0f 1f 80 00 00 00 00 4c 8b 04 24 65 48 8b 15 e4 12 82 7e 65 8b
RSP: 0018:ffffc900045ffa58 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 00000000000623a1 RCX: ffff88807a37d940
RDX: 0000000000000000 RSI: 00000000000623a1 RDI: 00000000000623a1
RBP: ffffc900045ffb70 R08: ffffffff88d346cb R09: fffffbfff20e2419
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920008bff62
R13: 00000000000623a1 R14: dffffc0000000000 R15: ffff88814b311d08
 inet_twsk_purge+0x75b/0x9d0 net/ipv4/inet_timewait_sock.c:307
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x763/0xb60 net/core/net_namespace.c:599
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10029 jiffies! g13793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=11513
rcu: rcu_preempt kthread starved for 10032 jiffies! g13793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26712 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </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: 4725 Comm: syz.2.265 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:197 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4687 [inline]
RIP: 0010:__lock_acquire+0x529/0x1ff0 kernel/locking/lockdep.c:4962
Code: 00 00 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 b1 12 00 00 44 0f b6 33 48 8b 44 24 38 0f b6 04 10 84 c0 0f 85 c0 12 00 00 <41> 8b 1f 81 e3 ff 1f 00 00 89 d8 c1 e8 06 48 8d 3c c5 c0 20 71 90
RSP: 0018:ffffc900030379a0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff900eb038 RCX: ffffffff8162b81b
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff907120c0
RBP: 0000000000000005 R08: dffffc0000000000 R09: fffffbfff20e2419
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: ffff88801c000ae8 R14: 0000000000000002 R15: ffff88801c000b38
FS:  00007f2e0f3986c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e1133d210 CR3: 00000000637cf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 __lock_task_sighand+0x20/0x290 kernel/signal.c:1387
 lock_task_sighand include/linux/sched/signal.h:710 [inline]
 do_send_sig_info kernel/signal.c:1293 [inline]
 group_send_sig_info+0x23f/0x2d0 kernel/signal.c:1442
 bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:824
 ____bpf_send_signal kernel/trace/bpf_trace.c:829 [inline]
 bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:827
 bpf_prog_7ba5217f62dcd359+0x38/0xa98
 bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
 bpf_trace_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1917
 __bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18
 trace_sys_enter include/trace/events/syscalls.h:18 [inline]
 syscall_trace_enter kernel/entry/common.c:77 [inline]
 __syscall_enter_from_user_work kernel/entry/common.c:96 [inline]
 syscall_enter_from_user_mode+0x202/0x240 kernel/entry/common.c:114
 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2e11120959
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f2e0f397b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f2e1133d210 RCX: 00007f2e11120959
RDX: 00007f2e0f397b40 RSI: 00007f2e0f397c70 RDI: 0000000000000011
RBP: 00007f2e1133d208 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2e1133d214
R13: 0000000000000000 R14: 00007ffe93c6fe30 R15: 00007ffe93c6ff18
 </TASK>