rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=366929, q=873 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10491 (4295132042-4295121551), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10490 jiffies! g366929 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=120256
rcu: rcu_preempt kthread starved for 10491 jiffies! g366929 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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 stack:27736 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 27035 Comm: syz.8.17354 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:sched_mm_cid_fork+0x686/0x10b0
Code: 5f 5d e9 2d 89 21 0a 49 c7 c4 f8 6e 2a 8e 49 c1 ec 03 bd 00 00 00 80 eb 0a 89 d8 f7 d8 0f 81 e1 fe ff ff f3 90 43 0f b6 04 2c <84> c0 75 3f 44 8b 35 77 a7 95 0c 4c 89 ff 4c 89 f6 e8 14 8f 23 03
RSP: 0018:ffffc9000356fc70 EFLAGS: 00000887
RAX: 0000000000000000 RBX: 0000000080000000 RCX: 0000000080000001
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88817707cbd0
RBP: 0000000080000000 R08: 1ffff1102ee0f819 R09: 0000000000000000
R10: 0000000000000000 R11: fffff520006adf7c R12: 1ffffffff1c54ddf
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88817707cbd0
FS:  00007fd236ad16c0(0000) GS:ffff88818dc1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdd934da08 CR3: 00000001abeba000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bprm_execve+0xe75/0x1630
 do_execveat_common+0x4f4/0x670
 __x64_sys_execveat+0xc7/0xf0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd235b9ce59
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:00007fd236ad1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007fd235e15fa0 RCX: 00007fd235b9ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007fd235c32e6f R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd235e16038 R14: 00007fd235e15fa0 R15: 00007ffed07e75c8
 </TASK>
