rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=d99c/1/0x4000000000000000 softirq=716142/716142 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=514121, q=247 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5904 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:mm_get_cid+0xab/0x130
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 c7 c5 c8 c4 f7 8d 49 c1 ed 03 bd 00 00 00 80 eb 07 44 89 f0 f7 d8 71 d4 f3 90 <43> 0f b6 44 25 00 84 c0 75 41 44 8b 3d dc 5c 63 0c 48 89 df 4c 89
RSP: 0018:ffffc9000470f988 EFLAGS: 00000887
RAX: 0000000080000000 RBX: ffff88811635f9d0 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff88811635f9d0
RBP: 0000000080000000 R08: ffff88811635f853 R09: 1ffff11022c6bf0a
R10: dffffc0000000000 R11: ffffed1022c6bf0b R12: dffffc0000000000
R13: 1ffffffff1bef899 R14: 0000000080000000 R15: 0000000000000002
FS:  00005555557c2500(0000) GS:ffff88818e0ec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c4245bf28 CR3: 000000011d946000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __schedule+0x21ad/0x5050
 schedule+0x164/0x360
 do_nanosleep+0x1c2/0x620
 hrtimer_nanosleep+0x188/0x390
 __se_sys_clock_nanosleep+0x35b/0x3b0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde2215cfce
Code: Unable to access opcode bytes at 0x7fde2215cfa4.
RSP: 002b:00007fff6551b7a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00005555557c2500 RCX: 00007fde2215cfce
RDX: 00007fff6551b800 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff6551b86c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000022accc R15: 00007fff6551b8c0
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g514121 f0x0 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:27288 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x14ea/0x5050
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x1560
 rcu_gp_kthread+0x9d/0x3b0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 14085 Comm: syz.1.24185 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:smp_call_function_single+0x39e/0x580
Code: e6 01 31 ff e8 73 f1 0b 00 41 83 e6 01 75 11 e8 28 ed 0b 00 4d 89 fe eb 3f e8 1e ed 0b 00 eb 3c 4d 89 fe f3 90 43 0f b6 04 2c <84> c0 75 0f f7 03 01 00 00 00 74 1d e8 01 ed 0b 00 eb e6 89 d9 80
RSP: 0018:ffffc900084efb00 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffc900084efb48 RCX: ffff888105fa8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900084efbd0 R08: ffffffff8fef2577 R09: 1ffffffff1fde4ae
R10: dffffc0000000000 R11: ffffffff8172fff0 R12: 1ffff9200109df69
R13: dffffc0000000000 R14: 1ffff9200109df64 R15: 1ffff9200109df64
FS:  000055555866c500(0000) GS:ffff8882a96ec000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d51bff8 CR3: 000000016a845000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000f6b0
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_barrier+0x360/0x580
 kvm_mmu_uninit_vm+0x53/0x90
 kvm_arch_destroy_vm+0x239/0x280
 kvm_put_kvm+0x6ca/0xa80
 kvm_vm_release+0x43/0x50
 __fput+0x44f/0xa70
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff4cd9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdf0ff36e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdf0ff37d0 RCX: 00007eff4cd9c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000022ad43 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2c620000 R11: 0000000000000246 R12: 00007ffdf0ff3810
R13: 00007eff4d015fac R14: 000000000022ad83 R15: 00007eff4d015fa0
 </TASK>
