rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=f43c/0/0x1 softirq=136650/136650 fqs=524
rcu: 	(detected by 1, t=10505 jiffies, g=140353, q=457 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:rb_erase+0xb/0xe20 lib/rbtree.c:441
Code: 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 <41> 54 53 48 83 ec 20 48 89 f3 49 89 ff 48 b9 00 00 00 00 00 fc ff
RSP: 0018:ffffc90000007d30 EFLAGS: 00000046
RAX: 1ffff110170c50b4 RBX: ffff8880b8628598 RCX: dffffc0000000000
RDX: ffff88807c364320 RSI: ffff8880b8628598 RDI: ffff88807c364300
RBP: ffff88807c364318 R08: ffffffff9a9e3863 R09: 1ffffffff353c70c
R10: dffffc0000000000 R11: fffffbfff353c70d R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff1100f86c863 R15: ffff88807c364300
FS:  0000000000000000(0000) GS:ffff888124f0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f7bfeb7c0 CR3: 000000016644a000 CR4: 00000000003526f0
DR0: 0000000000000007 DR1: ffffffffff7fff00 DR2: 4000000000010022
DR3: fffffffffffffff6 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rb_erase_linked+0x116/0x170 lib/rbtree.c:459
 timerqueue_linked_del include/linux/timerqueue.h:66 [inline]
 __remove_hrtimer+0xf7/0x3e0 kernel/time/hrtimer.c:1181
 __run_hrtimer kernel/time/hrtimer.c:2046 [inline]
 __hrtimer_run_queues+0x295/0xa10 kernel/time/hrtimer.c:2123
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2242
 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:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 0c 77 02 e9 03 07 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 4e 0e 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e807ca0 EFLAGS: 00000242
RAX: 0000000000bf006d RBX: ffffffff819b74b0 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8e253559 RDI: ffffffff8c4c7680
RBP: ffffffff8e807d78 R08: ffff8880b8633b9b R09: 1ffff110170c6773
R10: dffffc0000000000 R11: ffffed10170c6774 R12: 0000000000000000
R13: 1ffffffff1d11df0 R14: 1ffffffff1d00f9c R15: dffffc0000000000
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 rest_init+0x378/0x3a0 init/main.c:728
 start_kernel+0x397/0x3e0 init/main.c:1187
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x157
 </TASK>
rcu: rcu_preempt kthread starved for 7885 jiffies! g140353 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x1b2a/0x59a0 kernel/sched/core.c:7232
 __schedule_loop kernel/sched/core.c:7309 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7324
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x388/0x470 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: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 0c 77 02 e9 03 07 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 4e 0e 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0000:ffffc900001a7e40 EFLAGS: 00000246
RAX: 000000000151a993 RBX: ffffffff819b74b0 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8e253559 RDI: ffffffff8c4c7680
RBP: ffffc900001a7f10 R08: ffff8880b8733b9b R09: 1ffff110170e6773
R10: dffffc0000000000 R11: ffffed10170e6774 R12: 0000000000000000
R13: 1ffff11003cd0bb8 R14: 1ffff92000034fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88812500c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f82061c CR3: 000000017fcde000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>