rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=9934/1/0x4000000000000000 softirq=99209/99215 fqs=2
rcu: 	(detected by 0, t=10505 jiffies, g=108489, q=719 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 18761 Comm: dhcpcd-run-hook Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kasan_check_range+0x1c8/0x2c0
Code: 49 01 dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 7c 49 ff c3 49 ff cc 75 f2 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 45 84 ff 0f 85 a1 00
RSP: 0018:ffffc90000a08d08 EFLAGS: 00000056
RAX: 1ffff11034b4e601 RBX: 0000000000000010 RCX: ffffffff8bcc8acf
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffff8881a5a73308
RBP: 0000000000000000 R08: ffff8881a5a73317 R09: 1ffff11034b4e662
R10: dffffc0000000000 R11: ffffed1034b4e663 R12: 0000000000000002
R13: ffff8881a5a73300 R14: ffffed1034b4e663 R15: 1ffff11034b4e661
FS:  0000000000000000(0000) GS:ffff8882a8f54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f524680f0 CR3: 00000001ac37e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 __asan_memset+0x22/0x50
 timerqueue_linked_add+0x23f/0x2e0
 enqueue_hrtimer+0x18e/0x2c0
 __hrtimer_run_queues+0x4ce/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_switch+0x8c/0xf0
Code: 77 4e 8b 54 ce 10 65 44 8b 1d b0 b7 a5 11 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 24 17 00 00 00 74 cf <45> 8b 98 f8 16 00 00 41 83 fb 03 75 c2 4d 8b 98 00 17 00 00 45 8b
RSP: 0018:ffffc900097c7ab8 EFLAGS: 00000246
RAX: 0000000000000020 RBX: 0000000000000010 RCX: 0000000000000005
RDX: ffffffff81c8f325 RSI: ffffffff8ebbb740 RDI: 0000000000000010
RBP: 00000000000025fc R08: ffff88816a340000 R09: 0000000000000016
R10: 0000000000000016 R11: 0000000000000000 R12: dffffc0000000000
R13: 00000000000025fc R14: ffff88816a08260c R15: 00000000003864d0
 rb_event_length+0x45/0x400
 rb_read_data_buffer+0xe2/0x5b0
 check_buffer+0x288/0x7f0
 __rb_reserve_next+0x537/0xdc0
 ring_buffer_lock_reserve+0xbd5/0x1040
 trace_event_buffer_lock_reserve+0x1d2/0x700
 trace_event_buffer_reserve+0x1ef/0x2d0
 trace_event_raw_event_sys_enter+0x8f/0x170
 trace_syscall_enter+0xca/0x100
 do_syscall_64+0x3bf/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f5273b95a
Code: 01 00 48 83 c8 ff c3 b8 15 00 00 00 0f 05 48 3d 00 f0 ff ff 76 0c f7 d8 89 05 12 49 01 00 48 83 c8 ff c3 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 f6 48 01 00 48 83 c8 ff c3 83
RSP: 002b:00007ffd7cf6b728 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f8f52416040 RCX: 00007f8f5273b95a
RDX: 00007f8f52468100 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007ffd7cf6b890 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f8f527174b0
R13: 00007f8f52468120 R14: 00000000c0010001 R15: 0000000000000010
 </TASK>
rcu: rcu_preempt kthread starved for 10495 jiffies! g108489 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:28192 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0x152/0x2c0
 rcu_gp_fqs_loop+0x30c/0x11f0
 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: 0 UID: 0 PID: 18762 Comm: syz.0.4957 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x36/0x70
Code: 68 bd a5 11 65 8b 15 89 bd a5 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 24 17 00 00 00 74 2c 8b 91 f8 16 00 00 <83> fa 02 75 21 48 8b 91 00 17 00 00 48 8b 32 48 8d 7e 01 8b 89 fc
RSP: 0018:ffffc9000898f438 EFLAGS: 00000246
RAX: ffffffff81bae81d RBX: dffffc0000000000 RCX: ffff88811d710000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000898f588 R08: ffffffff90574737 R09: 1ffffffff20ae8e6
R10: dffffc0000000000 R11: fffffbfff20ae8e7 R12: 1ffff110478c81d1
R13: ffff88812103c448 R14: ffff88823c640e88 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88818d954000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db23ffc CR3: 000000000e946000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 smp_call_function_many_cond+0x11fd/0x15f0
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x5c4/0x1090
 tlb_flush_mmu+0x1af/0xa30
 tlb_finish_mmu+0xf4/0x220
 free_ldt_pgtables+0x192/0x360
 exit_mmap+0x1bf/0x9f0
 __mmput+0x118/0x420
 exit_mm+0x221/0x2d0
 do_exit+0x6cd/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0x104/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb91db9e0d9
Code: Unable to access opcode bytes at 0x7fb91db9e0af.
RSP: 002b:00007fb91ea250e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fb91de25fa8 RCX: 00007fb91db9e0d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb91de25fa8
RBP: 00007fb91de25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb91de26038 R14: 00007ffd70fdf1a0 R15: 00007ffd70fdf288
 </TASK>
