rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=f3b4/1/0x4000000000000000 softirq=20314/20320 fqs=1
rcu: 	(detected by 0, t=10502 jiffies, g=21045, q=1607 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1214 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_power_efficient gc_worker
RIP: 0010:lock_acquire+0xfa/0x350 kernel/locking/lockdep.c:5886
Code: 24 65 cd 11 45 31 c9 4c 89 7c 24 08 41 f7 c7 00 02 00 00 41 0f 94 c1 4c 89 ef 89 de 8b 54 24 04 44 89 e1 45 89 f0 6a 00 6a 00 <6a> 00 55 ff 74 24 30 e8 da 02 00 00 48 83 c4 28 48 c7 c7 8e c3 4d
RSP: 0018:ffffc90000a08c48 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8eb5a1e0
RBP: ffffffff89e13f28 R08: 0000000000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: ffffed100b048856 R12: 0000000000000002
R13: ffffffff8eb5a1e0 R14: 0000000000000000 R15: 0000000000000046
FS:  0000000000000000(0000) GS:ffff888125024000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffebc0bd2e0 CR3: 0000000076d6c000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 rcu_read_lock include/linux/rcupdate.h:840 [inline]
 advance_sched+0xa04/0xc80 net/sched/sch_taprio.c:993
 __run_hrtimer kernel/time/hrtimer.c:2067 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2124
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2243
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:seqcount_lockdep_reader_access+0xed/0x100 include/linux/seqlock.h:76
Code: 00 75 11 e8 a5 cb d2 f7 4d 85 f6 75 16 e8 9b cb d2 f7 eb 15 e8 94 cb d2 f7 e8 ff 32 e4 01 4d 85 f6 74 ea e8 85 cb d2 f7 fb 5b <41> 5e e9 4c 38 e7 01 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90
RSP: 0018:ffffc90005827990 EFLAGS: 00000293
RAX: ffffffff89f441cb RBX: 0000000000000001 RCX: ffff8880286fddc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005827af0 R08: ffffffff90589237 R09: 1ffffffff20b1246
R10: dffffc0000000000 R11: fffffbfff20b1247 R12: ffff888028654918
R13: 1ffff110050dfc50 R14: 0000000000000200 R15: 0000000000005358
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:343 [inline]
 gc_worker+0x31b/0x1890 net/netfilter/nf_conntrack_core.c:1534
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa88/0x14c0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread starved for 10284 jiffies! g21045 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:27496 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d4/0x5630 kernel/sched/core.c:7239
 __schedule_loop kernel/sched/core.c:7316 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7331
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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:
CPU: 0 UID: 0 PID: 5273 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:csd_lock kernel/smp.c:396 [inline]
RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:944
Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 91 36 0c 00 41 83 e7 01 75 07 e8 86 31 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01
RSP: 0018:ffffc900033ff460 EFLAGS: 00000293
RAX: ffffffff81badbee RBX: ffff8880b8741208 RCX: ffff8880324b9f40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900033ff5b0 R08: ffff8880324bb4d7 R09: 1ffff1100649769a
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110170e8241
R13: 0000000000000001 R14: ffff8880b8741200 R15: 0000000000000001
FS:  00007fb7ff188780(0000) GS:ffff888124f24000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a0529a93d0 CR3: 0000000077432000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x8ff/0x1090 arch/x86/mm/tlb.c:1435
 dup_mmap+0x1786/0x1d90 mm/mmap.c:1905
 dup_mm kernel/fork.c:1549 [inline]
 copy_mm+0x11a/0x480 kernel/fork.c:1601
 copy_process+0x1e75/0x43e0 kernel/fork.c:2313
 kernel_clone+0x2d7/0x940 kernel/fork.c:2772
 __do_sys_clone kernel/fork.c:2914 [inline]
 __se_sys_clone kernel/fork.c:2898 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2898
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb7ff25c636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffceb8a56f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffceb8a56f8 RCX: 00007fb7ff25c636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffceb8c5c40 R08: 0000000000000000 R09: 0000000000000001
R10: 00007fb7ff188a50 R11: 0000000000000246 R12: 00007ffceb8a5830
R13: 0000000000000000 R14: 0000000000000000 R15: 000055e596279ac0
 </TASK>