GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10521 jiffies, g=22877, q=702 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10519 (4294963102-4294952583), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10519 jiffies! g22877 f0x2 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:25784 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5930 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue:  0x0 (events_power_efficient)
RIP: 0010:sched_balance_rq+0x43d9/0x58b0 kernel/sched/fair.c:11909
Code: 74 05 e8 da 67 32 00 9c 58 a9 00 02 00 00 0f 85 f3 00 00 00 f7 84 24 b8 00 00 00 00 02 00 00 74 01 fb 44 8b b4 24 80 03 00 00 <41> f6 c6 02 0f 85 26 f0 ff ff 41 f6 c6 04 0f 84 b1 02 00 00 48 83
RSP: 0018:ffffc90000a08a40 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 000000000000cad5 RCX: 0000000000000101
RDX: 0000000000000000 RSI: ffffffff8d792037 RDI: ffffffff8bc083e0
RBP: ffffc90000a08e78 R08: ffffffff8f822277 R09: 1ffffffff1f0444e
R10: dffffc0000000000 R11: fffffbfff1f0444f R12: ffffc90000a08dd8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b873b730
FS:  0000000000000000(0000) GS:ffff888125f21000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff664126830 CR3: 0000000032bee000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sched_balance_domains+0x45e/0x960 kernel/sched/fair.c:12311
 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch+0x242/0x940 kernel/sched/core.c:5114
Code: 0f 84 c2 01 00 00 48 85 db 0f 85 e9 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 c8 78 ca 09 e8 b3 10 37 00 fb 4c 8b 65 c0 <49> 8d bc 24 48 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90004eff9d8 EFLAGS: 00000206
RAX: 000000000001ca9f RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8d792037 RDI: ffffffff8bc083e0
RBP: ffffc90004effa30 R08: ffffffff8f822277 R09: 1ffffffff1f0444e
R10: dffffc0000000000 R11: fffffbfff1f0444f R12: ffff888021e93d00
R13: dffffc0000000000 R14: ffff88802ba2db80 R15: ffff8880b873b498
 context_switch kernel/sched/core.c:5259 [inline]
 __schedule+0x14a3/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 worker_thread+0xa82/0xda0 kernel/workqueue.c:3436
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>