rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=55977, q=149 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294987526-4294977024), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g55977 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=21003
rcu: rcu_preempt kthread starved for 10502 jiffies! g55977 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:26728 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
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: 16192 Comm: syz.2.3102 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:its_return_thunk+0x0/0x10
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <c3> cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e9 6b 32 b6 f5 cc
RSP: 0018:ffffc90000006fc8 EFLAGS: 00000006
RAX: ffffffff81adabe1 RBX: ffff888020655f28 RCX: ffff888130d78000
RDX: 0000000000010100 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 00000000ffffffff R08: ffff88804b027a83 R09: 1ffff11009604f50
R10: dffffc0000000000 R11: ffffed1009604f51 R12: ffff888020655fd0
R13: dffffc0000000000 R14: ffff888020655f28 R15: ffffffffffff05a3
FS:  00007f89aebe56c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003000 CR3: 000000003b35c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 hrtimer_cancel+0x31/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unwind_next_frame+0x12f6/0x2390
Code: 43 06 00 00 49 89 d5 48 89 d5 48 89 d8 48 29 e8 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 <49> 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6
RSP: 0018:ffffc90000007718 EFLAGS: 00000206
RAX: 000000000000000a RBX: ffffffff8fe25814 RCX: 000000000000000b
RDX: ffffffff8fe257e8 RSI: ffffffff9073c5b2 RDI: ffffffff8be33e20
RBP: ffffffff8fe257e8 R08: 000000000000000c R09: ffffffff8172d195
R10: ffffc90000007838 R11: ffffffff81ac4d00 R12: ffffffff8552bc83
R13: ffffffff8fe257e8 R14: ffffc900000077e8 R15: 0000000000000014
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kmem_cache_free+0x18f/0x400
 rcu_core+0xcab/0x1770
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:get_random_u32+0x4e7/0x940
Code: e3 00 02 00 00 75 7e e8 07 12 6d fc 48 8b 5c 24 28 4d 85 ff 75 07 e8 f8 11 6d fc eb 06 e8 f1 11 6d fc fb 8b 84 24 00 01 00 00 <48> c7 44 24 40 0e 36 e0 45 42 c7 04 23 00 00 00 00 4a c7 44 23 0c
RSP: 0018:ffffc90003047780 EFLAGS: 00000287
RAX: 000000000be89533 RBX: 1ffff92000608ef8 RCX: 0000000000080000
RDX: ffffc900096ba000 RSI: 000000000000203e RDI: 000000000000203f
RBP: ffffc900030478e8 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff88804b036230 R15: 0000000000000200
 __get_random_u32_below+0x14/0x90
 bpf_jit_binary_pack_alloc+0x1e9/0x330
 bpf_int_jit_compile+0x7e4/0x1450
 bpf_prog_select_runtime+0x49e/0x810
 bpf_prog_load+0x1343/0x1930
 __sys_bpf+0x528/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f89add8eba9
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:00007f89aebe5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f89adfd5fa0 RCX: 00007f89add8eba9
RDX: 0000000000000070 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f89ade11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f89adfd6038 R14: 00007f89adfd5fa0 R15: 00007ffe32afe968
 </TASK>
