rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=155537, q=460 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4295035403-4295024903), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g155537 f0x2 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:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:schedule+0x152/0x360
Code: 0a be 01 00 00 00 e8 4d e4 2a f9 48 c7 c7 40 72 bf 8d 4c 89 f6 e8 0e 0e 65 f6 49 89 de 49 c1 ee 03 eb 09 48 f7 03 08 00 00 00 <74> 2c bf 01 00 00 00 e8 f2 9f 57 f6 31 ff e8 cb b1 ff ff bf 01 00
RSP: 0018:ffffc90000137a28 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88801bef5640 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8b9e6fc0 RDI: 00000000ffffffff
RBP: 1ffff110037deacb R08: ffffffff8f5cac37 R09: 1ffffffff1eb9586
R10: dffffc0000000000 R11: fffffbfff1eb9587 R12: ffff88801bef566c
R13: dffffc0000000000 R14: 1ffff110037deac8 R15: ffff88801bef68c8
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 5821 Comm: kworker/u11:2 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
Workqueue:  0x0 (krxrpcd)
RIP: 0010:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 ff b5 a8 09 e8 ba 3b 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900030ef838 EFLAGS: 00000282
RAX: 85305a748ab94d00 RBX: 0000000000000000 RCX: 85305a748ab94d00
RDX: 0000000000000000 RSI: ffffffff8d531ee2 RDI: ffffffff8b9e6fe0
RBP: ffffc900030ef890 R08: ffffffff8f5cac37 R09: 1ffffffff1eb9586
R10: dffffc0000000000 R11: fffffbfff1eb9587 R12: ffff8880226b5640
R13: dffffc0000000000 R14: ffff8880296b8000 R15: ffff88804b23ab58
FS:  0000000000000000(0000) GS:ffff8880b8d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000340 CR3: 000000003144a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __schedule+0x17a0/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_count_add+0x32/0x1a0
Code: 53 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 20 63 55 99 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 f1 00 00 00 83 3d be f8 c6 17 00 <75> 07 65 8b 05 c5 b5 bb 10 65 01 3d be b5 bb 10 48 c7 c0 20 63 55
RSP: 0018:ffffc900030efc28 EFLAGS: 00000246
RAX: 0000000000000004 RBX: ffff8880226b5640 RCX: ffffffff99556303
RDX: 0000000000000000 RSI: ffffffff8b9e6fc0 RDI: 0000000000000001
RBP: 1ffff110044d6acb R08: ffffffff8f5cac37 R09: 1ffffffff1eb9586
R10: dffffc0000000000 R11: fffffbfff1eb9587 R12: ffff8880226b566c
R13: dffffc0000000000 R14: 1ffff110044d6ac8 R15: dffffc0000000000
 schedule+0x15e/0x360
 worker_thread+0xa82/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
