rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=f394/1/0x4000000000000002 softirq=114539/114540 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=97677, q=137 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-syzkaller-10401-gdee264c16a63 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:hlock_class+0x13/0x70 kernel/locking/lockdep.c:234
Code: 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f b7 47 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 2d ef 39 14 <73> 15 48 8d 04 80 48 8d 04 80 48 8d 04 c5 e0 f9 d1 95 e9 16 54 e7
RSP: 0018:ffffc90000007c48 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 0000000000000000 RCX: 00000000fffffffe
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8e298230
RBP: ffffffff8e297740 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff8e298230
R13: ffffffff8e298230 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88812476e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f273a3d4f98 CR3: 000000004b17d000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __lock_acquire+0x622/0x1c90 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5871 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 advance_sched+0x699/0xc80 net/sched/sch_taprio.c:985
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x22a/0xc10 kernel/sched/core.c:5260
Code: fb 09 00 00 44 8b 05 d9 d8 1d 0f 45 85 c0 0f 85 be 01 00 00 4c 89 e7 e8 a4 f6 ff ff e8 7f e4 39 00 fb 65 48 8b 1d 8e 3e 41 12 <48> 8d bb 18 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffffff8e207bf0 EFLAGS: 00000206
RAX: 000000000025bf11 RBX: ffffffff8e297740 RCX: ffffffff81c3c4ff
RDX: 0000000000000000 RSI: ffffffff8de06e85 RDI: ffffffff8c1532c0
RBP: ffffffff8e207c38 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90a78857 R11: 0000000000000001 R12: ffff8880b843bd00
R13: ffff888025582440 R14: ffff88805c094b40 R15: ffff8880b843cb70
 context_switch kernel/sched/core.c:5395 [inline]
 __schedule+0x1172/0x5de0 kernel/sched/core.c:6781
 schedule_idle+0x5c/0x90 kernel/sched/core.c:6900
 do_idle+0x2b6/0x510 kernel/sched/idle.c:353
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
 rest_init+0x16b/0x2b0 init/main.c:743
 start_kernel+0x3e9/0x4d0 init/main.c:1099
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
 common_startup_64+0x13e/0x148
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g97677 f0x0 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:27576 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x116a/0x5de0 kernel/sched/core.c:6781
 __schedule_loop kernel/sched/core.c:6859 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6874
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 24554 Comm: syz.6.8284 Not tainted 6.15.0-syzkaller-10401-gdee264c16a63 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xd0b/0x1490 kernel/smp.c:885
Code: e8 8a 12 0c 00 45 85 ed 74 46 48 8b 14 24 49 89 d6 49 89 d5 49 c1 ee 03 41 83 e5 07 4d 01 e6 41 83 c5 03 e8 27 17 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 6f 05 00 00 8b 43 08 31 ff
RSP: 0018:ffffc90005607928 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffff8880b84439c0 RCX: ffffc9001dffe000
RDX: 0000000000080000 RSI: ffffffff81afd479 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000003 R14: ffffed1017088739 R15: ffff8880b853cfc0
FS:  00007ff23fa526c0(0000) GS:ffff88812486e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c381f68 CR3: 000000004c34a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 clock_was_set+0x642/0x870 kernel/time/hrtimer.c:976
 timekeeping_inject_offset+0x2e3/0x3f0 kernel/time/timekeeping.c:1446
 do_adjtimex+0x36f/0xaa0 kernel/time/timekeeping.c:2554
 do_clock_adjtime kernel/time/posix-timers.c:1162 [inline]
 __do_sys_clock_adjtime+0x175/0x290 kernel/time/posix-timers.c:1174
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff23eb8e969
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:00007ff23fa52038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007ff23edb5fa0 RCX: 00007ff23eb8e969
RDX: 0000000000000000 RSI: 0000200000000480 RDI: 0000000000000000
RBP: 00007ff23ec10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff23edb5fa0 R15: 00007ffd99d81f48
 </TASK>
vkms_vblank_simulate: vblank timer overrun