GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=9314/1/0x4000000000000000 softirq=136814/136814 fqs=3
rcu: 	(detected by 0, t=10502 jiffies, g=160449, q=680 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3021 Comm: syz.2.4944 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__asan_memset+0x5/0x50
Code: 01 00 00 00 e9 5c e5 ff ff 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> 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00
RSP: 0018:ffffc90000a08d48 EFLAGS: 00000046
RAX: 1ffff1102e639460 RBX: ffff88823c628518 RCX: ffff88802e6c5880
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8881731ca308
RBP: dffffc0000000000 R08: ffffffff9030f0f7 R09: 1ffffffff2061e1e
R10: dffffc0000000000 R11: fffffbfff2061e1f R12: 1ffff110478c5098
R13: ffff8881731ca300 R14: 0000000000000000 R15: ffff88823c628518
FS:  00007f3391d926c0(0000) GS:ffff8882a9284000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43c0fadac0 CR3: 0000000021ebe000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 timerqueue_linked_add+0x23f/0x2e0
 enqueue_hrtimer+0x18e/0x2c0
 __hrtimer_run_queues+0x4d2/0xa20
 hrtimer_interrupt+0x44b/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:free_swap_cache+0x4c/0x300
Code: 73 08 4d 89 f5 49 c1 ed 03 43 80 7c 25 00 00 74 08 4c 89 f7 e8 a5 03 09 00 4d 8b 3e 4c 89 fe 48 83 e6 01 31 ff e8 84 74 9d ff <49> 83 e7 01 0f 85 46 02 00 00 48 89 df be 08 00 00 00 e8 ed 05 09
RSP: 0018:ffffc900045cf4c8 EFLAGS: 00000293
RAX: ffffffff8228556c RBX: ffffea0006eba900 RCX: ffff88802e6c5880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900045cf788 R08: ffffea0006eba947 R09: 1ffffd4000dd7528
R10: dffffc0000000000 R11: fffff94000dd7529 R12: dffffc0000000000
R13: 1ffffd4000dd7521 R14: ffffea0006eba908 R15: ffffea0006eba948
 free_pages_and_swap_cache+0x1ba/0x490
 tlb_flush_mmu+0x6b4/0xa10
 tlb_finish_mmu+0xf9/0x230
 exit_mmap+0x498/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x1f6/0x2d0
 do_exit+0x6a2/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x840
 exit_to_user_mode_loop+0x8c/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3390f9ce59
Code: Unable to access opcode bytes at 0x7f3390f9ce2f.
RSP: 002b:00007f3391d92028 EFLAGS: 00000246 ORIG_RAX: 0000000000000007
RAX: 0000000000000001 RBX: 00007f3391215fa0 RCX: 00007f3390f9ce59
RDX: 000000007fffffff RSI: 0000000000000001 RDI: 0000200000000000
RBP: 00007f3391032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3391216038 R14: 00007f3391215fa0 R15: 00007ffe8965d298
 </TASK>
rcu: rcu_preempt kthread starved for 10496 jiffies! g160449 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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 13839 Comm: kworker/u9:13 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:smp_call_function_many_cond+0xfd4/0x13d0
Code: 89 ee 83 e6 01 31 ff e8 7a 06 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 25 02 0c 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 06 01 00 00 00 74 1e e8 0a 02 0c 00 eb e5 44 89
RSP: 0018:ffffc90006f27700 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff88812103c2c8 RCX: ffff8881101c3b00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90006f27840 R08: ffffffff9030f0f7 R09: 1ffffffff2061e1e
R10: dffffc0000000000 R11: fffffbfff2061e1f R12: 1ffff110478c8199
R13: dffffc0000000000 R14: ffff88823c640cc8 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818dc84000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f763fff CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 smp_text_poke_batch_finish+0x5f5/0x1160
 arch_jump_label_transform_apply+0x1c/0x30
 static_key_enable_cpuslocked+0x128/0x240
 static_key_enable+0x1a/0x20
 toggle_allocation_gate+0xab/0x290
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
