rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12508
rcu: 	(detected by 1, t=10502 jiffies, g=45185, q=1364 ncpus=2)
task:syz.1.2750      state:R  running task     stack:21960 pid:12508 tgid:12507 ppid:10886  task_flags:0x400140 flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x30
 </TASK>
rcu: rcu_preempt kthread starved for 10376 jiffies! g45185 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27392 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 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:
CPU: 1 UID: 0 PID: 12496 Comm: syz.2.2746 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:memset_orig+0x84/0xb0
Code: 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 ff c9 48 89 07 48 8d 7f 08 75 f5 83 e2 07 74 0a ff ca 88 07 <48> 8d 7f 01 75 f6 4c 89 d0 e9 0e cc 02 00 48 83 fa 07 76 e3 48 89
RSP: 0018:ffffc90000a084b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc90000a08580 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffc90000a08599
RBP: ffffc90000a08610 R08: 0000000000000006 R09: 0000000000000002
R10: ffffc90000a08582 R11: fffff520001410b3 R12: ffff8881b28cce40
R13: ffff88804b8c7500 R14: 1ffff920001410ac R15: dffffc0000000000
FS:  00007ffb5e2156c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c80d91866 CR3: 000000016dbf4000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ieee80211_rx_mesh_data+0xd6/0x1550
 ieee80211_rx_handlers+0x3302/0xc8e0
 ieee80211_prepare_and_rx_handle+0x2c27/0x7460
 ieee80211_rx_list+0x2899/0x3730
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x55/0xb0
Code: 27 26 8e 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 ac 17 86 00 48 c7 c3 d8 09 3a 93 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 19 09 8e 11 74 11 83 e0
RSP: 0018:ffffc9000750f510 EFLAGS: 00000a02
RAX: 1ffff110478c673b RBX: ffff88823c6339d8 RCX: 0000000080000001
RDX: ffff8881771c0000 RSI: ffffffff8c28aa40 RDI: ffffffff8c28aa00
RBP: 0000000000000001 R08: ffffffff81d59666 R09: ffffffff8e95cd60
R10: ffffc9000750f618 R11: ffffffff81b0d880 R12: ffff8881771c0000
R13: 1ffff1102ee380be R14: ffffffff8e262798 R15: dffffc0000000000
 is_bpf_text_address+0x64/0x2b0
 kernel_text_address+0xa5/0xe0
 __kernel_text_address+0xd/0x30
 unwind_get_return_address+0x4d/0x90
 arch_stack_walk+0xfb/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc7/0xd30
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 taskstats_exit+0x14a/0xa70
 do_exit+0x682/0x22c0
 do_group_exit+0x21b/0x2d0
 get_signal+0x1284/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 exit_to_user_mode_loop+0x86/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb5d39cdd9
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:00007ffb5e2150e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007ffb5d615fa8 RCX: 00007ffb5d39cdd9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ffb5d615fa8
RBP: 00007ffb5d615fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb5d616038 R14: 00007ffe0b8c63c0 R15: 00007ffe0b8c64a8
 </TASK>
sched: DL replenish lagged too much
