syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=8e64/1/0x4000000000000000 softirq=9645/9646 fqs=0
	(detected by 0, t=10506 jiffies, g=9749, q=44 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4239 Comm: syz-executor Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4724 [inline]
RIP: 0010:__lock_acquire+0x5b9/0x1f80 kernel/locking/lockdep.c:4999
Code: 8b 34 24 0f 85 e9 13 00 00 83 3d b1 a3 ca 15 00 0f 84 23 05 00 00 31 db 48 81 c3 b9 00 00 00 48 89 d8 48 c1 e8 03 0f b6 04 10 <84> c0 0f 85 f7 11 00 00 48 8b 44 24 20 49 8d 84 c5 e0 0a 00 00 48
RSP: 0018:ffffc900001e0a00 EFLAGS: 00000802
RAX: 0000000000000000 RBX: ffffffff90bd61d9 RCX: ffffffff816aad5a
RDX: dffffc0000000000 RSI: ffff88802f388ae0 RDI: ffffffff9124e260
RBP: 0000000000000002 R08: dffffc0000000000 R09: fffffbfff2249c4d
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802f388ad8
R13: ffff88802f388000 R14: ffff88802f388bc8 R15: 1ffff11005e71179
FS:  0000555592de9500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb96e579f98 CR3: 0000000077515000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x63/0x380 lib/debugobjects.c:753
 debug_hrtimer_deactivate kernel/time/hrtimer.c:426 [inline]
 debug_deactivate+0x1d/0x280 kernel/time/hrtimer.c:482
 __run_hrtimer kernel/time/hrtimer.c:1657 [inline]
 __hrtimer_run_queues+0x334/0xe50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:674 [inline]
RIP: 0010:nf_conntrack_tcp_packet+0x2b37/0x57c0 net/netfilter/nf_conntrack_proto_tcp.c:1254
Code: 03 42 0f b6 04 28 84 c0 4d 89 fe 0f 85 12 23 00 00 c6 03 00 e9 1c 09 00 00 e8 c5 69 9e f8 4c 8b 64 24 20 8b 84 24 94 00 00 00 <45> 89 e5 45 29 fd 89 84 24 94 00 00 00 41 01 c5 48 b8 00 00 00 00
RSP: 0018:ffffc90003d56cc0 EFLAGS: 00000202
RAX: 00000000002ff780 RBX: 0000000000000007 RCX: 0000000000000007
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000020
RBP: ffffc90003d56f70 R08: ffffffff88ec2ccb R09: ffffc90003d56e40
R10: 0000000000000000 R11: dffffc0000000001 R12: 00000000d6a6bbef
R13: 00000000ffd0087f R14: 00000000d6a6bbef R15: 00000000d6a6bbef
 nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1943 [inline]
 nf_conntrack_in+0xdab/0x1d10 net/netfilter/nf_conntrack_core.c:2034
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:614
 nf_hook+0x2c0/0x450 include/linux/netfilter.h:257
 __ip_local_out+0x38b/0x4a0 net/ipv4/ip_output.c:115
 ip_local_out net/ipv4/ip_output.c:124 [inline]
 __ip_queue_xmit+0x10e7/0x1b60 net/ipv4/ip_output.c:532
 __tcp_transmit_skb+0x1e33/0x33a0 net/ipv4/tcp_output.c:1405
 tcp_cleanup_rbuf net/ipv4/tcp.c:1651 [inline]
 tcp_recvmsg_locked+0x1b77/0x2450 net/ipv4/tcp.c:2671
 tcp_recvmsg+0x258/0x920 net/ipv4/tcp.c:2701
 inet_recvmsg+0x13b/0x250 net/ipv4/af_inet.c:890
 sock_recvmsg_nosec net/socket.c:1022 [inline]
 sock_recvmsg net/socket.c:1040 [inline]
 sock_read_iter+0x3b2/0x4b0 net/socket.c:1121
 call_read_iter include/linux/fs.h:2259 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x88d/0xbf0 fs/read_write.c:470
 ksys_read+0x19c/0x2c0 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f59c65846fd
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 a8 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 41 7e 1c 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffdf8417148 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f59c65846fd
RDX: 0000000000000204 RSI: 0000555592e0b450 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffdf84730b0 R09: 0000000000000010
R10: 00007ffdf8473080 R11: 0000000000000246 R12: 00007ffdf8417570
R13: 0000000000000204 R14: 0000555592e0b450 R15: 00007ffdf84171f0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g9749 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=4752
rcu: rcu_preempt kthread starved for 10506 jiffies! g9749 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:26136 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 4479 Comm: syz.3.55 Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x1b4/0x200 arch/x86/kernel/kvm.c:1064
Code: e0 48 c1 e8 03 42 0f b6 04 28 84 c0 75 42 45 0f b6 34 24 e8 2e 10 55 00 44 3a 74 24 1c 75 10 66 90 0f 00 2d 2e 20 cd 09 fb f4 <e9> c8 fe ff ff fb e9 c2 fe ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 54
RSP: 0018:ffffc90000006a40 EFLAGS: 00000246
RAX: a31c9ec284788100 RBX: 1ffff92000000d4c RCX: ffffffff816b126a
RDX: dffffc0000000000 RSI: ffffffff8b0c0340 RDI: ffffffff8b5e6840
RBP: ffffc90000006b10 R08: dffffc0000000000 R09: fffffbfff2249c65
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807e350188
R13: dffffc0000000000 R14: 0000000000000003 R15: ffffc90000006a80
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0d7a85d27a CR3: 000000005ac4f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x6fb/0xc50 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x269/0x370 kernel/locking/spinlock_debug.c:115
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 nf_conntrack_tcp_packet+0x3f5/0x57c0 net/netfilter/nf_conntrack_proto_tcp.c:989
 nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1943 [inline]
 nf_conntrack_in+0xdab/0x1d10 net/netfilter/nf_conntrack_core.c:2034
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow net/netfilter/core.c:614 [inline]
 nf_hook_slow_list+0x2b6/0x660 net/netfilter/core.c:653
 NF_HOOK_LIST include/linux/netfilter.h:338 [inline]
 ip_sublist_rcv+0xd67/0xe70 net/ipv4/ip_input.c:637
 ip_list_rcv+0x422/0x470 net/ipv4/ip_input.c:674
 __netif_receive_skb_list_ptype net/core/dev.c:5581 [inline]
 __netif_receive_skb_list_core+0x6b1/0x890 net/core/dev.c:5629
 __netif_receive_skb_list net/core/dev.c:5681 [inline]
 netif_receive_skb_list_internal+0xa0d/0xe20 net/core/dev.c:5772
 gro_normal_list include/net/gro.h:433 [inline]
 napi_complete_done+0x352/0x820 net/core/dev.c:6113
 virtqueue_napi_complete drivers/net/virtio_net.c:403 [inline]
 virtnet_poll+0xc4a/0x1450 drivers/net/virtio_net.c:1687
 __napi_poll+0xc7/0x470 net/core/dev.c:6547
 napi_poll net/core/dev.c:6614 [inline]
 net_rx_action+0x70f/0xeb0 net/core/dev.c:6728
 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:571
 __do_softirq kernel/softirq.c:605 [inline]
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:654
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:666
 common_interrupt+0xb3/0xd0 arch/x86/kernel/irq.c:240
 </IRQ>
 <TASK>
 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:682
RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5666
Code: 2b 00 74 08 4c 89 f7 e8 9f 8e 77 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:ffffc9000483f140 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000907e34 RCX: 1ffff92000907dd4
RDX: dffffc0000000000 RSI: ffffffff8b0c14c0 RDI: ffffffff8b5e6840
RBP: ffffc9000483f298 R08: dffffc0000000000 R09: fffffbfff2249c4d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000907e30
R13: dffffc0000000000 R14: ffffc9000483f1a0 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 page_ext_get+0x39/0x2a0 mm/page_ext.c:157
 page_table_check_clear+0x4b/0x6d0 mm/page_table_check.c:71
 zap_pte_range mm/memory.c:1435 [inline]
 zap_pmd_range mm/memory.c:1574 [inline]
 zap_pud_range mm/memory.c:1603 [inline]
 zap_p4d_range mm/memory.c:1624 [inline]
 unmap_page_range+0x1b4a/0x2740 mm/memory.c:1645
 unmap_vmas+0x48b/0x640 mm/memory.c:1730
 exit_mmap+0x249/0x980 mm/mmap.c:3238
 __mmput+0x115/0x3c0 kernel/fork.c:1200
 exit_mm+0x226/0x300 kernel/exit.c:565
 do_exit+0x9f1/0x26a0 kernel/exit.c:858
 do_group_exit+0x202/0x2b0 kernel/exit.c:1021
 get_signal+0x16f7/0x17d0 kernel/signal.c:2871
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb96d785d29
Code: Unable to access opcode bytes at 0x7fb96d785cff.
RSP: 002b:00007fb96e57a0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fb96d975fa8 RCX: 00007fb96d785d29
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb96d975fa8
RBP: 00007fb96d975fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb96d975fac
R13: 0000000000000000 R14: 00007ffdf0b7df50 R15: 00007ffdf0b7e038
 </TASK>