rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5717/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=15209, q=1785771 ncpus=2)
task:syz.0.55        state:R  running task     stack:22752 pid:5717  tgid:5709  ppid:5361   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6861
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6885
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 follow_page_pte+0xfc5/0x2010 mm/gup.c:935
 follow_pmd_mask mm/gup.c:969 [inline]
 follow_pud_mask mm/gup.c:1021 [inline]
 follow_p4d_mask mm/gup.c:1038 [inline]
 follow_page_mask mm/gup.c:1081 [inline]
 __get_user_pages+0xb75/0x48d0 mm/gup.c:1483
 populate_vma_page_range+0x264/0x330 mm/gup.c:1923
 __mm_populate+0x27a/0x460 mm/gup.c:2026
 mm_populate include/linux/mm.h:3371 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb3fd37dff9
RSP: 002b:00007fb3fe122038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fb3fd536058 RCX: 00007fb3fd37dff9
RDX: 000000000200000d RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fb3fd3f0296 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000004008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fb3fd536058 R15: 00007ffe499e71c8
 </TASK>
rcu: rcu_preempt kthread starved for 10091 jiffies! g15209 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:25680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5285 Comm: kworker/1:4 Not tainted 6.12.0-rc2-syzkaller-00631-g6d858708d465 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:native_apic_msr_eoi+0xf/0x20 arch/x86/include/asm/apic.h:218
Code: f8 c3 cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa b9 0b 08 00 00 31 c0 31 d2 0f 30 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000a18228 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc90000a18278 RCX: 000000000000080b
RDX: 0000000000000000 RSI: ffffffff8c07b540 RDI: ffffffff8c60fb20
RBP: 0000000000000000 R08: ffffffff8135b181 R09: 1ffffffff203a235
R10: dffffc0000000000 R11: fffffbfff203a236 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32d1cff8 CR3: 000000006606c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 apic_eoi arch/x86/include/asm/apic.h:410 [inline]
 __sysvec_apic_timer_interrupt+0x47/0x3f0 arch/x86/kernel/apic/apic.c:1041
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1037
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ae f2 2d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 73 98 92 f5 65 8b 05 c4 32 33 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90000a18320 EFLAGS: 00000206
RAX: 152dae1d64740800 RBX: 1ffff92000143068 RCX: ffffffff8170ce6a
RDX: dffffc0000000000 RSI: ffffffff8c0acac0 RDI: 0000000000000001
RBP: ffffc90000a183b0 R08: ffffffff942cc8ef R09: 1ffffffff285991d
R10: dffffc0000000000 R11: fffffbfff285991e R12: dffffc0000000000
R13: 1ffff92000143064 R14: ffffc90000a18340 R15: 0000000000000246
 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline]
 debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1019
 slab_free_hook mm/slub.c:2273 [inline]
 slab_free mm/slub.c:4579 [inline]
 kmem_cache_free+0x11f/0x420 mm/slub.c:4681
 nf_conntrack_free+0x2fd/0x390 net/netfilter/nf_conntrack_core.c:1735
 nf_ct_put include/net/netfilter/nf_conntrack.h:186 [inline]
 nf_conntrack_in+0xb51/0x1890 net/netfilter/nf_conntrack_core.c:2061
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
 __netif_receive_skb_one_core net/core/dev.c:5668 [inline]
 __netif_receive_skb+0x2bf/0x650 net/core/dev.c:5781
 process_backlog+0x662/0x15b0 net/core/dev.c:6113
 __napi_poll+0xcb/0x490 net/core/dev.c:6834
 napi_poll net/core/dev.c:6903 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:7025
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]
 nsim_dev_trap_report_work+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>