rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=9ff4/1/0x4000000000000000 softirq=38084/38087 fqs=196
rcu: 	(t=10500 jiffies g=35461 q=962 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10065 jiffies! g35461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=19828
rcu: rcu_preempt kthread starved for 10066 jiffies! g35461 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:27744 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:124 [inline]
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:431 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x63a/0xbc0 kernel/locking/qspinlock.c:325
Code: 80 ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 c6 44 01 06 02 66 c7 84 24 90 00 00 00 00 01 48 8b 4c 24 48 0f b6 04 01 <84> c0 75 6f 48 8b 44 24 10 80 38 00 74 1d 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900000074e0 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffffc90000007580 RCX: 1ffff1100540682b
RDX: 0000000000000100 RSI: ffffffff8def7b46 RDI: ffff8880b863bcc0
RBP: ffffc900000075f0 R08: ffffffff9011a3b7 R09: 1ffffffff2023476
R10: dffffc0000000000 R11: fffffbfff2023477 R12: 00000000ffffef28
R13: 0000000000000000 R14: 1ffff1100540682b R15: ffff8880b863bcd4
FS:  0000000000000000(0000) GS:ffff88812545d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557fd914e8 CR3: 000000000e54c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116
 spin_lock include/linux/spinlock.h:341 [inline]
 __dev_xmit_skb net/core/dev.c:4224 [inline]
 __dev_queue_xmit+0xbf2/0x3890 net/core/dev.c:4802
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ndisc_send_skb+0xd0b/0x1670 net/ipv6/ndisc.c:512
 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4041
 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
 handle_softirqs+0x22a/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 8e 6c 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 e2 1a 00 fb f4 <e9> fc e9 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e407dc0 EFLAGS: 00000242
RAX: 00000000001255d3 RBX: ffffffff819a900a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8def7b46 RDI: ffffffff8c27c200
RBP: ffffffff8e407eb0 R08: ffff8880b863395b R09: 1ffff110170c672b
R10: dffffc0000000000 R11: ffffed10170c672c R12: 0000000000000000
R13: 1ffffffff1c929d8 R14: 0000000000000000 R15: 1ffffffff1c929d8
 arch_safe_halt arch/x86/kernel/process.c:766 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x36a/0x5f0 kernel/sched/idle.c:352
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451
 rest_init+0x2de/0x300 init/main.c:760
 start_kernel+0x385/0x3d0 init/main.c:1210
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x147
 </TASK>
CPU: 1 UID: 0 PID: 11271 Comm: syz.3.1552 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:mall_classify+0x0/0x200 net/sched/cls_matchall.c:31
Code: fb ff ff 4c 89 e7 48 89 cb e8 0c b3 73 f8 48 89 d9 e9 6f fb ff ff cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 89 d3 49 89 f7 49 89
RSP: 0018:ffffc9001b40f208 EFLAGS: 00000246
RAX: 1ffff11006b102e2 RBX: 0000000000000008 RCX: 0000000000080000
RDX: ffffc9001b40f320 RSI: ffff888035881700 RDI: ffff8880413d7000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000008 R11: ffffffff89bc2fe0 R12: ffff8880413d709c
R13: ffff888035881700 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f461aa676c0(0000) GS:ffff88812555d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002280 CR3: 0000000034a7c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tc_classify include/net/tc_wrapper.h:197 [inline]
 __tcf_classify net/sched/cls_api.c:1764 [inline]
 tcf_classify+0x4cf/0x1130 net/sched/cls_api.c:1860
 hfsc_classify net/sched/sch_hfsc.c:1146 [inline]
 hfsc_enqueue+0x32b/0xf50 net/sched/sch_hfsc.c:1545
 dev_qdisc_enqueue+0x4e/0x290 net/core/dev.c:4151
 __dev_xmit_skb net/core/dev.c:4266 [inline]
 __dev_queue_xmit+0x1ad0/0x3890 net/core/dev.c:4802
 packet_snd net/packet/af_packet.c:3076 [inline]
 packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3108
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0x972/0x9f0 net/socket.c:2592
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4619b9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f461aa67028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4619e16090 RCX: 00007f4619b9c799
RDX: 0000000000000005 RSI: 0000200000000280 RDI: 000000000000000a
RBP: 00007f4619c32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4619e16128 R14: 00007f4619e16090 R15: 00007ffe1cdc4eb8
 </TASK>