rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5086/2:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=20981, q=643 ncpus=2)
task:syz-fuzzer      state:R  running task     stack:24896 pid:5086  tgid:5067  ppid:5065   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6746
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7068
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:sock_confirm_neigh include/net/sock.h:2205 [inline]
RIP: 0010:ip_finish_output2+0x729/0x25e0 net/ipv4/ip_output.c:233
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 1d 00 00 48 8b 04 24 48 8b 68 18 48 85 ed 74 50 e8 1e 8a 4e f8 48 8d bd 08 03 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48
RSP: 0018:ffffc90003457438 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88801eaa8800 RCX: ffffffff893f37ef
RDX: ffff888067e68000 RSI: ffffffff893f3832 RDI: ffff888077b20f48
RBP: ffff888077b20c40 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: 000000000100800a R15: 0000000000000010
 __ip_finish_output net/ipv4/ip_output.c:313 [inline]
 __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:295
 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433
 dst_output include/net/dst.h:450 [inline]
 ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:129
 __ip_queue_xmit+0x747/0x1940 net/ipv4/ip_output.c:535
 __tcp_transmit_skb+0x29c1/0x3dc0 net/ipv4/tcp_output.c:1462
 tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
 tcp_write_xmit+0xfe0/0x7e50 net/ipv4/tcp_output.c:2792
 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:2977
 tcp_push+0x221/0x6f0 net/ipv4/tcp.c:738
 tcp_sendmsg_locked+0x2798/0x3470 net/ipv4/tcp.c:1310
 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1342
 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x4b8/0x5c0 net/socket.c:1160
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6db/0x1100 fs/read_write.c:590
 ksys_write+0x1f8/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x40720e
RSP: 002b:000000c0007212c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000040720e
RDX: 00000000000000f0 RSI: 000000c00047c200 RDI: 0000000000000003
RBP: 000000c000721308 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000c000721448
R13: 0000000000000001 R14: 000000c000603380 R15: 000000000000000f
 </TASK>
rcu: rcu_preempt kthread starved for 10307 jiffies! g20981 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:27664 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6838
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2582
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.9.0-rc4-syzkaller-00329-g48cf398f15fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:113
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 18 91 28 75 48 8b 00 a8 08 75 0c 66 90 0f 00 2d e8 87 9f 00 fb f4 <fa> c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8d407d70 EFLAGS: 00000246
RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8adb2989
RDX: 0000000000000001 RSI: ffff888019aeb800 RDI: ffff888019aeb864
RBP: ffff888019aeb864 R08: 0000000000000001 R09: ffffed1017286fdd
R10: ffff8880b9437eeb R11: 0000000000000000 R12: ffff88801bb52000
R13: ffffffff8e338940 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555a1b9938 CR3: 00000000757da000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707
 cpuidle_enter_state+0x85/0x500 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x313/0x3f0 kernel/sched/idle.c:332
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 rest_init+0x16b/0x2b0 init/main.c:739
 start_kernel+0x3a3/0x490 init/main.c:1081
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
 common_startup_64+0x13e/0x148
 </TASK>