rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=1c94/1/0x4000000000000000 softirq=45985/45985 fqs=4879
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1189429          0            0
rcu: 	cputime:    32760      19728           80   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=38629 q=2508 ncpus=2)
CPU: 1 UID: 0 PID: 11632 Comm: syz.5.1553 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:unwind_next_frame+0x9e4/0x2390
Code: 0f 97 c2 20 c2 20 ca 80 fa 01 0f 85 49 0f 00 00 48 8d 43 08 4c 39 f8 0f 97 c1 4c 39 e0 0f 96 c0 20 c8 3c 01 0f 85 2f 0f 00 00 <48> 89 df e8 d4 25 00 00 49 89 c4 48 8b 34 24 48 8d 5e 01 48 bd 00
RSP: 0018:ffffc900001e0518 EFLAGS: 00000202
RAX: ffffc900001e1001 RBX: ffffc900001e0ff8 RCX: 1ffff9200003c001
RDX: ffffffff90db72a2 RSI: ffffffff90db72a6 RDI: ffffffff8be332a0
RBP: 1ffff9200003c0bf R08: 000000000000000f R09: ffffffff8172c195
R10: ffffc900001e02c0 R11: ffffffff81ac3930 R12: 1ffff9200003c0be
R13: ffffc900001e1000 R14: ffffc900001e05e8 R15: ffffc900001d9000
FS:  00007f98791366c0(0000) GS:ffff8881a3c1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3b1b1e CR3: 000000010b388000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000003 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 new_skb+0x2f/0x2b0
 aoecmd_cfg+0x28b/0x7c0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 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: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 2f b7 ea 09 e8 5a 3f 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:ffffc90004fc7518 EFLAGS: 00000286
RAX: bd009afc76ce3f00 RBX: 0000000000000000 RCX: bd009afc76ce3f00
RDX: 0000000000000006 RSI: ffffffff8d9b6a0a RDI: ffffffff8be33300
RBP: ffffc90004fc7570 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffff888106b70000
R13: dffffc0000000000 R14: ffff888107ff0000 R15: ffff88813663ab58
 __schedule+0x17a0/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 synchronize_rcu_expedited+0x3b9/0x730
 synchronize_rcu+0x11a/0x310
 cpu_map_free+0x29/0x190
 bpf_map_free+0x96/0xc0
 map_create+0xf0e/0x14d0
 __sys_bpf+0x60f/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f987838ebe9
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:00007f9879136038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f98785b5fa0 RCX: 00007f987838ebe9
RDX: 0000000000000050 RSI: 00002000000009c0 RDI: 0000000000000000
RBP: 00007f9878411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98785b6038 R14: 00007f98785b5fa0 R15: 00007ffe08aa9ee8
 </TASK>
