rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=c8f4/1/0x4000000000000000 softirq=89312/89312 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=63841, q=320 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15016 Comm: syz.3.3603 Not tainted 6.15.0-rc5-syzkaller-00204-g0e1329d4045c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rb_next+0x4f/0x130 lib/rbtree.c:503
Code: 85 f8 00 00 00 48 8b 2b 48 39 eb 0f 84 ae 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 c3 00 00 00 49 bc 00 00 00 00 00 fc ff df 48 8b 43 08 48 85
RSP: 0018:ffffc90000007db8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff888029914340 RCX: ffffffff8b68ede0
RDX: 1ffff11005322869 RSI: ffffffff8b68ee70 RDI: ffff888029914348
RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000001
R10: ffff888029914340 R11: 0000000000000000 R12: ffff8880b8427998
R13: 0000000000000000 R14: ffff8880b8427840 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881249e1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ef1cff8 CR3: 0000000026a8b000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rb_erase_cached include/linux/rbtree.h:124 [inline]
 timerqueue_del+0xd8/0x150 lib/timerqueue.c:57
 __remove_hrtimer+0x99/0x290 kernel/time/hrtimer.c:1121
 __run_hrtimer kernel/time/hrtimer.c:1741 [inline]
 __hrtimer_run_queues+0x4f9/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_write_unlock_irq include/linux/rwlock_api_smp.h:274 [inline]
RIP: 0010:_raw_write_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:358
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 da 96 28 f6 48 89 df e8 a2 f4 28 f6 e8 bd 82 53 f6 fb bf 01 00 00 00 <e8> e2 56 19 f6 65 8b 05 2b 8c 34 08 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc900032d7a58 EFLAGS: 00000206
RAX: 00000000000000e7 RBX: ffffffff8e00c080 RCX: ffffffff81c2e5af
RDX: 0000000000000000 RSI: ffffffff8dbe13ef RDI: 0000000000000001
RBP: ffff888061668000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9084f017 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880353ba440 R14: dffffc0000000000 R15: 0000000000000000
 release_task+0xe3f/0x1c70 kernel/exit.c:284
 exit_notify kernel/exit.c:790 [inline]
 do_exit+0x1506/0x2c30 kernel/exit.c:973
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x260 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe4d118e969
Code: Unable to access opcode bytes at 0x7fe4d118e93f.
RSP: 002b:00007fe4d1fa80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe4d13b5fa8 RCX: 00007fe4d118e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe4d13b5fa8
RBP: 00007fe4d13b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe4d13b5fac
R13: 0000000000000000 R14: 00007ffe2b88bd20 R15: 00007ffe2b88be08
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g63841 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=24864
rcu: rcu_preempt kthread starved for 10502 jiffies! g63841 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:27848 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>