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=9964/1/0x4000000000000000 softirq=65607/65608 fqs=2
rcu: 	(detected by 0, t=10506 jiffies, g=67721, q=284 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16239 Comm: syz.0.3724 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:638 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1197 [inline]
RIP: 0010:trace_hrtimer_expire_entry include/trace/events/timer.h:259 [inline]
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1758 [inline]
RIP: 0010:__hrtimer_run_queues+0x439/0xc60 kernel/time/hrtimer.c:1825
Code: ec 11 00 65 44 8b 2d 6a 80 ee 10 bf 07 00 00 00 44 89 ee e8 a9 f0 11 00 41 83 fd 07 0f 87 cb 02 00 00 e8 5a ec 11 00 45 89 ef <41> c1 ed 06 4a 8d 3c ed f0 0c a1 8f be 08 00 00 00 e8 d1 6c 75 00
RSP: 0018:ffffc90000a08d40 EFLAGS: 00000006
RAX: ffffffff81ae6fe6 RBX: ffff8880b8727c08 RCX: ffff88802a1abc00
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000007
RBP: ffffc90000a08e90 R08: ffff8880b8727ac3 R09: 1ffff110170e4f58
R10: dffffc0000000000 R11: ffffed10170e4f59 R12: ffff88807b601340
R13: 0000000000000001 R14: ffffffff8985f810 R15: 0000000000000001
FS:  00007fd66be8c6c0(0000) GS:ffff888125d51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c230000 CR3: 0000000064f19000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:smp_call_function_many+0x4/0x40 kernel/smp.c:908
Code: e2 83 0b 00 e8 0d be 7e ff eb d0 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 <41> 57 41 56 41 54 53 89 cb 49 89 d6 49 89 f7 49 89 fc e8 a5 83 0b
RSP: 0018:ffffc90003b6fbf8 EFLAGS: 00000246
RAX: 1ffff11005435a1c RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff81ae2750 RDI: ffffc90003b6fca0
RBP: ffffc90003b6fd10 R08: ffffffff8fa10cf7 R09: 1ffffffff1f4219e
R10: dffffc0000000000 R11: fffffbfff1f4219f R12: 0000000000000002
R13: ffff8880b8727ac0 R14: fc87e7d66df6c19a R15: dffffc0000000000
 clock_was_set+0x709/0x7c0 kernel/time/hrtimer.c:976
 do_settimeofday64+0x2ec/0x5e0 kernel/time/timekeeping.c:1407
 __do_sys_clock_settime kernel/time/posix-timers.c:1132 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1116 [inline]
 __x64_sys_clock_settime+0x22c/0x280 kernel/time/posix-timers.c:1116
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd66af8e929
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:00007fd66be8c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007fd66b1b5fa0 RCX: 00007fd66af8e929
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007fd66b010b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd66b1b5fa0 R15: 00007ffe87142be8
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g67721 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27320 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 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: 0 UID: 0 PID: 16237 Comm: syz.2.3725 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #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+0xf6e/0x12d0 kernel/smp.c:885
Code: 89 ee 83 e6 01 31 ff e8 60 78 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 0b 74 0b 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 07 01 00 00 00 74 1e e8 f0 73 0b 00 eb e5 44 89
RSP: 0018:ffffc9000bd976e0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b863cb40 RCX: ffff88802f6e3c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000bd97840 R08: ffffffff8fa10cf7 R09: 1ffffffff1f4219e
R10: dffffc0000000000 R11: fffffbfff1f4219f R12: 1ffff110170e828d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8741468
FS:  0000000000000000(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70a6583338 CR3: 0000000043fce000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline]
 tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
 exit_mmap+0x44c/0xb50 mm/mmap.c:1297
 __mmput+0x118/0x420 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x640/0x22e0 kernel/exit.c:943
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
 __do_sys_exit_group kernel/exit.c:1115 [inline]
 __se_sys_exit_group kernel/exit.c:1113 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1113
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f07aef8e929
Code: Unable to access opcode bytes at 0x7f07aef8e8ff.
RSP: 002b:00007fff259a3f08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f07aef8e929
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff259a3f6c R08: 00000004259a3fff R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000002ac
R13: 00000000000927c0 R14: 0000000000074484 R15: 00007fff259a3fc0
 </TASK>
vkms_vblank_simulate: vblank timer overrun