GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=a3c4/1/0x4000000000000000 softirq=114842/114876 fqs=1
rcu: 	(detected by 0, t=10502 jiffies, g=124181, q=672 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 21596 Comm: syz.7.4513 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__lock_release kernel/locking/lockdep.c:5544 [inline]
RIP: 0010:lock_release kernel/locking/lockdep.c:5889 [inline]
RIP: 0010:lock_release+0xe7/0x310 kernel/locking/lockdep.c:5875
Code: 00 00 45 85 ff 0f 84 a4 01 00 00 48 8d 4c 24 0c 44 89 fa 48 89 de 4c 89 e7 e8 f5 85 ff ff 48 85 c0 0f 84 88 01 00 00 8b 50 24 <85> d2 0f 85 de 01 00 00 66 83 78 22 1f 76 0c 66 83 68 22 20 66 83
RSP: 0018:ffffc90000a08d90 EFLAGS: 00000082
RAX: ffff88807d9db158 RBX: ffff88802b68d2c0 RCX: ffffc90000a08d9c
RDX: 0000000000000000 RSI: ffff88802b68d2c0 RDI: ffff88807d9db158
RBP: ffffffff89c886d2 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807d9da540
R13: 1bc17002b9e791ce R14: 0000000000000006 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff888123ed8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000073180000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f7 DR2: 0000000000000083
DR3: 000000002f41a6d3 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:190
 spin_unlock include/linux/spinlock.h:390 [inline]
 advance_sched+0x6a2/0xd20 net/sched/sch_taprio.c:988
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/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:folio_test_anon include/linux/page-flags.h:718 [inline]
RIP: 0010:mm_counter include/linux/mm.h:3387 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1658 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1730 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1832 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1934 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:2020 [inline]
RIP: 0010:zap_pud_range mm/memory.c:2048 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:2069 [inline]
RIP: 0010:__zap_vma_range+0x1333/0x4a30 mm/memory.c:2109
Code: 03 0f 8e 6c 33 00 00 8b 6d 40 31 ff 81 e5 00 00 80 00 89 ee e8 3e 8a ab ff 85 ed 75 0d e8 c5 8f ab ff 4c 89 ef e8 0d 4d ef ff <e8> b8 8f ab ff 48 8b 84 24 a0 00 00 00 48 b9 00 00 00 00 00 fc ff
RSP: 0018:ffffc90005cff560 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff825ed14c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807d9da540
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803622b300
R13: ffffea00020d5840 R14: ffff888060d48ad0 R15: 8000000083561007
 unmap_vmas+0x299/0x5f0 mm/memory.c:2178
 exit_mmap+0x1ef/0xa00 mm/mmap.c:1300
 __mmput+0x12a/0x410 kernel/fork.c:1187
 mmput+0x67/0x80 kernel/fork.c:1210
 exit_mm kernel/exit.c:615 [inline]
 do_exit+0x8b1/0x2ae0 kernel/exit.c:997
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3046
 arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f711e79e019
Code: Unable to access opcode bytes at 0x7f711e79dfef.
RSP: 002b:00007f711f6eb0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f711ea25fa8 RCX: 00007f711e79e019
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f711ea25fa8
RBP: 00007f711ea25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f711ea26038 R14: 00007ffe316786e0 R15: 00007ffe316787c8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g124181 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=65251
rcu: rcu_preempt kthread starved for 10500 jiffies! g124181 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28984 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>