rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=50fc/1/0x4000000000000000 softirq=21240/21241 fqs=21
rcu: 	(detected by 0, t=10502 jiffies, g=13185, q=253 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7360 Comm: syz.1.400 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:do_raw_spin_lock+0x105/0x290
Code: ff df 41 0f b6 04 07 84 c0 0f 85 58 01 00 00 41 8b 45 00 65 8b 0d af cb 02 11 39 c8 0f 84 f3 00 00 00 c7 44 24 40 00 00 00 00 <48> 89 df be 04 00 00 00 e8 9e a4 85 00 48 8d 7c 24 40 be 04 00 00
RSP: 0018:ffffc900001df880 EFLAGS: 00000082
RAX: 00000000ffffffff RBX: ffff888136627a80 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dbaa21a RDI: ffff888136627a80
RBP: ffffc900001df930 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffff888136627a90
R13: ffff888136627a88 R14: 1ffff11026cc4f52 R15: 1ffff11026cc4f51
FS:  00007fd039b776c0(0000) GS:ffff8881a3c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c28ca0e CR3: 0000000020552000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_lock_irqsave+0xb3/0xf0
 hrtimer_try_to_cancel+0x22b/0x420
 hrtimer_cancel+0x3b/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:deref_stack_reg+0x1b3/0x230
Code: 39 f0 0f 96 c0 20 c8 3c 01 75 30 4c 89 c7 49 89 f7 e8 11 08 00 00 49 89 c6 48 8b 5c 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 d3 be b0 00 4c 89 33 b0 01 eb 02 31 c0 48 83 c4
RSP: 0018:ffffc900001e0180 EFLAGS: 00000246
RAX: 1ffff9200003c05d RBX: ffffc900001e02e8 RCX: 0000000000000001
RDX: ffffc900001e02e8 RSI: dffffc0000000000 RDI: ffffc900001e0690
RBP: 1ffff9200003c055 R08: ffffc900001e0690 R09: 0000000000000000
R10: ffffc900001e02f8 R11: fffff5200003c061 R12: 1ffff9200003c056
R13: 1ffff9200003c057 R14: ffffc900001e07d0 R15: dffffc0000000000
 unwind_next_frame+0x17c4/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 ref_tracker_alloc+0x133/0x460
 dst_init+0xd9/0x450
 dst_alloc+0x12a/0x170
 icmp6_dst_alloc+0x75/0x420
 ndisc_send_skb+0x41f/0x1440
 addrconf_rs_timer+0x369/0x670
 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:unwind_get_return_address+0x9/0x90
Code: 4c 89 f7 4c 89 fe e9 29 ff ff ff e8 61 07 08 0a 90 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 <48> 89 fb 49 be 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 42 0f
RSP: 0018:ffffc900048b6b48 EFLAGS: 00000202
RAX: 00000000903ffd01 RBX: ffffc900048b6c20 RCX: 253685dacd34be00
RDX: 0000000000000000 RSI: ffffffff8dbaa21a RDI: ffffc900048b6b68
RBP: ffffc900048b6bf0 R08: ffffc900048b6f68 R09: 0000000000000000
R10: ffffc900048b6bb8 R11: fffff52000916d79 R12: ffff8881090dd640
R13: ffff88801a449780 R14: ffffffff81ac4d00 R15: ffffc900048b6b68
 arch_stack_walk+0xfc/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x271/0x4e0
 krealloc_noprof+0x124/0x340
 push_jmp_history+0x1cc/0x6f0
 check_mem_access+0xbbd/0x1cd0
 do_check+0x88b8/0xed30
 do_check_common+0x1938/0x24e0
 bpf_check+0x18319/0x1d6a0
 bpf_prog_load+0x1318/0x1930
 __sys_bpf+0x4ff/0x850
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd038d8ec29
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:00007fd039b77038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd038fd5fa0 RCX: 00007fd038d8ec29
RDX: 0000000000000048 RSI: 0000200000000200 RDI: 0000000000000005
RBP: 00007fd038e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd038fd6038 R14: 00007fd038fd5fa0 R15: 00007ffeb775fed8
 </TASK>
rcu: rcu_preempt kthread starved for 10460 jiffies! g13185 f0x0 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:27224 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:
CPU: 0 UID: 0 PID: 7347 Comm: syz.3.397 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:smp_call_function_many_cond+0xd33/0x12d0
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5f
RSP: 0018:ffffc90004897580 EFLAGS: 00000293
RAX: ffffffff81b4621b RBX: 1ffff11026cc7f61 RCX: ffff88801f4d8000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004897700 R08: ffffffff8fa3b337 R09: 1ffffffff1f47666
R10: dffffc0000000000 R11: fffffbfff1f47667 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f224224 CR3: 000000000df36000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 free_ldt_pgtables+0x17b/0x320
 exit_mmap+0x17c/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa942f8ec29
Code: Unable to access opcode bytes at 0x7fa942f8ebff.
RSP: 002b:00007ffc959f9b18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa942f8ec29
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc959f9b7c R08: 00000015959f9c0f R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000011
R13: 00000000000927c0 R14: 000000000001c869 R15: 00007ffc959f9bd0
 </TASK>
