rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=f5ec/1/0x4000000000000000 softirq=21722/21722 fqs=2
rcu: 	(detected by 0, t=10502 jiffies, g=15937, q=563 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6437 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline]
RIP: 0010:__lock_acquire+0x36c/0x2df0 kernel/locking/lockdep.c:5187
Code: e3 15 09 d3 09 cb 44 09 eb 41 89 5c c7 20 41 89 7c c7 24 4c 89 7c 24 28 4d 8d 2c c7 81 e3 ff 1f 00 00 48 0f a3 1d b4 7e 85 11 <73> 15 48 69 c3 c8 00 00 00 48 8d 88 30 23 c3 92 4c 8b 74 24 08 eb
RSP: 0018:ffffc90000a08a38 EFLAGS: 00000047
RAX: 0000000000000005 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000080000 RSI: 0000000000004000 RDI: 0000000000000000
RBP: 0000000000004000 R08: ffffffff9943fab0 R09: ffffffff848f8359
R10: ffff888058d13340 R11: ffffed100b1a266b R12: 0000000000000001
R13: ffff88802de3e620 R14: 0000000000000001 R15: ffff88802de3e5f8
FS:  00007f8cdfce76c0(0000) GS:ffff888126779000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8cdfce6f98 CR3: 00000000415a2000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x11c/0x350 kernel/locking/lockdep.c:5868
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa3/0xf0 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x69/0x350 lib/debugobjects.c:873
 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
 debug_deactivate+0x1d/0x1f0 kernel/time/hrtimer.c:483
 __run_hrtimer kernel/time/hrtimer.c:1745 [inline]
 __hrtimer_run_queues+0x2ac/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x457/0xa90 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x107/0x3f0 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa4/0x100 kernel/locking/spinlock.c:194
Code: 74 05 e8 bf 49 b0 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 67 08 79 f6 65 8b 05 40 2e 04 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000215fb00 EFLAGS: 00000206
RAX: f6179a31861b9c00 RBX: 0000000000000a06 RCX: f6179a31861b9c00
RDX: 0000000000000000 RSI: ffffffff8d2ce61b RDI: 0000000000000001
RBP: ffffc9000215fb90 R08: ffffffff8f360477 R09: 1ffffffff1e6c08e
R10: dffffc0000000000 R11: fffffbfff1e6c08f R12: dffffc0000000000
R13: 1ffff9200042bf78 R14: ffffffff9929f628 R15: 1ffff9200042bf60
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:557 [inline]
 __do_adjtimex kernel/time/timekeeping.c:2732 [inline]
 do_adjtimex+0x769/0xb10 kernel/time/timekeeping.c:2743
 do_clock_adjtime kernel/time/posix-timers.c:1161 [inline]
 __do_sys_clock_adjtime kernel/time/posix-timers.c:1173 [inline]
 __se_sys_clock_adjtime kernel/time/posix-timers.c:1164 [inline]
 __x64_sys_clock_adjtime+0x1f3/0x2a0 kernel/time/posix-timers.c:1164
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x86/0x540 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f8cded8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8cdfce7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f8cdefe6090 RCX: 00007f8cded8eec9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f8cdee11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8cdefe6128 R14: 00007f8cdefe6090 R15: 00007ffd226ed008
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g15937 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:27288 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1794/0x4c40 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x161/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x127/0x260 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2fd/0x1520 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:2285
 kthread+0x70d/0x890 kernel/kthread.c:463
 ret_from_fork+0x4b4/0x840 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: 6422 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd2b/0x12a0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 9e 6c 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 59 68 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 3d 68
RSP: 0018:ffffc9000216f580 EFLAGS: 00000293
RAX: ffffffff81b366f3 RBX: 1ffff11017127ffd RCX: ffff888024c85ac0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000216f700 R08: ffffffff8f360477 R09: 1ffffffff1e6c08e
R10: dffffc0000000000 R11: fffffbfff1e6c08f R12: ffff8880b893ffe8
R13: dffffc0000000000 R14: ffff8880b883b200 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888126679000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556c405ec138 CR3: 000000000d938000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x689/0x1250 arch/x86/mm/tlb.c:1451
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline]
 tlb_flush_mmu+0x1a3/0x670 mm/mmu_gather.c:403
 tlb_finish_mmu+0xbf/0x1d0 mm/mmu_gather.c:497
 free_ldt_pgtables+0x177/0x310 arch/x86/kernel/ldt.c:411
 arch_exit_mmap arch/x86/include/asm/mmu_context.h:234 [inline]
 exit_mmap+0x170/0xb00 mm/mmap.c:1266
 __mmput+0x118/0x430 kernel/fork.c:1133
 exit_mm+0x1d6/0x2b0 kernel/exit.c:582
 do_exit+0x644/0x22f0 kernel/exit.c:954
 do_group_exit+0x218/0x2d0 kernel/exit.c:1107
 __do_sys_exit_group kernel/exit.c:1118 [inline]
 __se_sys_exit_group kernel/exit.c:1116 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1116
 x64_sys_call+0x21f3/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x86/0x540 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4f5ae296c5
Code: Unable to access opcode bytes at 0x7f4f5ae2969b.
RSP: 002b:00007ffd66b82d28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000556c405d6910 RCX: 00007f4f5ae296c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 00007ffd66b83058 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd66b83050
R13: 00007ffd66b83060 R14: 00007f4f5b039000 R15: 0000556c14d96d98
 </TASK>