rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=8529, q=216 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294954392-4294943890), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g8529 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=2241
rcu: rcu_preempt kthread starved for 10502 jiffies! g8529 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:27256 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6302 Comm: syz.0.84 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:hrtimer_try_to_cancel+0xa8/0x420
Code: 0f b6 04 34 84 c0 0f 85 bf 00 00 00 8b 2b 89 ee 83 e6 01 31 ff e8 a8 32 12 00 89 e8 83 e0 01 0f 85 02 01 00 00 e8 58 2e 12 00 <48> 8b 44 24 28 42 0f b6 04 30 84 c0 0f 85 ac 00 00 00 48 8b 04 24
RSP: 0018:ffffc90000007928 EFLAGS: 00000006
RAX: ffffffff81ac4788 RBX: ffff88804b227b50 RCX: ffff888038e70000
RDX: 0000000000010000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000004d0b6 R08: ffff88804b227ac3 R09: 1ffff11009644f58
R10: dffffc0000000000 R11: ffffed1009644f59 R12: 1ffff11009644f6a
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88804b227b40
FS:  00007f72821f56c0(0000) GS:ffff8880b8d73000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 000000011306e000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3b8/0x500
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x0/0xb0
Code: c7 c7 e0 f7 d3 8d e8 cf ca 17 03 eb cc 66 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 41 57 41 56 53 65 ff 05 20 bb a5 10 e8 bb 6d 92 09 89
RSP: 0018:ffffc900065b7788 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffffff81725d05 RCX: ffffe8ff14822270
RDX: ffffffff81725d05 RSI: ffffffff8b9ec2c0 RDI: ffffffff8b9ec280
RBP: dffffc0000000000 R08: ffffc900065b7cc0 R09: 0000000000000000
R10: ffffc900065b7918 R11: fffff52000cb6f25 R12: ffffc900065b7cd0
R13: ffffffff81725d05 R14: ffffffff8dd3a960 R15: ffffffff8dd3a960
 lock_release+0x4b/0x3e0
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 sk_prot_alloc+0xe7/0x220
 sk_alloc+0x3a/0x370
 __netlink_create+0x65/0x260
 netlink_create+0x3ca/0x590
 __sock_create+0x4b3/0x9f0
 __sys_socket+0xd7/0x1b0
 __x64_sys_socket+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f728138ec29
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:00007f72821f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f72815d6090 RCX: 00007f728138ec29
RDX: 0000000000000010 RSI: 0000000000000002 RDI: 0000000000000010
RBP: 00007f7281411e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f72815d6128 R14: 00007f72815d6090 R15: 00007fff38469628
 </TASK>
