rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=b464/1/0x4000000000000000 softirq=54934/54934 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=56345, q=378 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11982 Comm: modprobe 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:__lock_acquire+0xa82/0x2e50
Code: 67 48 0f b9 3a 90 31 c0 48 8b 3c 24 48 83 78 40 00 0f 84 2e 1e 00 00 49 8b 46 20 25 ff 1f 00 00 48 0f a3 05 b0 5a d1 12 73 10 <48> 69 c0 c8 00 00 00 48 8d 80 10 05 15 94 eb 3a 83 3d 77 ea d4 18
RSP: 0018:ffffc90000007a58 EFLAGS: 00000003
RAX: 000000000000006b RBX: 00000000c8301548 RCX: 0000000000001b6b
RDX: 00000000001b76fd RSI: 00000000c0284d41 RDI: ffff8881ab4d1e00
RBP: 3be9ba3200000000 R08: a000000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffff8881210281d8 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8881ab4d29f8 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff88818d95c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd24a7d028 CR3: 0000000115e68000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350
 _raw_spin_lock_irq+0x3d/0x50
 __hrtimer_run_queues+0x466/0xa10
 hrtimer_interrupt+0x448/0x910
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:handle_softirqs+0x15b/0x840
Code: 89 6c 24 20 0f b7 db 48 c7 c7 60 30 eb 8b e8 2c 38 47 0a 65 66 c7 05 3a d5 e3 11 00 00 e8 ed b9 46 00 fb 48 c7 c5 c0 a0 80 8e <b8> ff ff ff ff 0f bc c3 41 89 c4 41 ff c4 0f 84 09 04 00 00 89 5c
RSP: 0018:ffffc90000007f30 EFLAGS: 00000202
RAX: 0000000000000a6e RBX: 0000000000000004 RCX: 0000000080000100
RDX: 0000000000000002 RSI: ffffffff8e226a9e RDI: ffffffff8c4bc580
RBP: ffffffff8e80a0c0 R08: ffffffff90572237 R09: 1ffffffff20ae446
R10: dffffc0000000000 R11: fffffbfff20ae447 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8881ab4d1e00 R15: dffffc0000000000
 __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:unwind_next_frame+0x509/0x2550
Code: 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 48 63 03 48 01 d8 48 8d 4b 04 48 39 e8 4c 0f 46 f9 <48> 8d 43 fc 4c 0f 47 e0 4c 0f 46 eb 4d 39 e7 76 a9 e9 7c fd ff ff
RSP: 0018:ffffc90009737008 EFLAGS: 00000283
RAX: ffffffff816dff78 RBX: ffffffff906fc604 RCX: ffffffff906fc608
RDX: ffffffff906fc604 RSI: ffffffff90ed3cb0 RDI: ffffffff8c4bc520
RBP: ffffffff816e0052 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8eb59c60 R12: ffffffff906fc604
R13: ffffffff906fc604 R14: ffffc90009737108 R15: ffffffff906fc608
 __unwind_start+0x514/0x660
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_noprof+0x2a0/0x5f0
 vm_area_alloc+0x24/0x140
 mmap_region+0x12cb/0x2240
 do_mmap+0xe0a/0x1300
 vm_mmap_pgoff+0x272/0x4e0
 ksys_mmap_pgoff+0x4dc/0x760
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd24aa2b74
Code: 63 08 44 89 e8 5b 41 5c 41 5d c3 41 89 ca 41 f7 c1 ff 0f 00 00 74 0c c7 05 f5 46 01 00 16 00 00 00 eb 17 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f
RSP: 002b:00007ffd21004c18 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffd21004cc8 RCX: 00007fcd24aa2b74
RDX: 0000000000000003 RSI: 0000000000004000 RDI: 00007fcd24a79000
RBP: 00007ffd21004f80 R08: 0000000000000000 R09: 00000000000be000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007fcd24a7d000
R13: 00007ffd21005008 R14: 00000000000be138 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g56345 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:27752 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: 1 UID: 0 PID: 11979 Comm: syz.6.1349 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:smp_call_function_many_cond+0x11e6/0x15f0
Code: c0 75 7a 41 8b 1e 89 de 83 e6 01 31 ff e8 42 21 0c 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 ee 1c 0c 00 eb 37 f3 90 <41> 0f b6 04 1c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 d3 1c 0c
RSP: 0018:ffffc900095f7960 EFLAGS: 00000246
RAX: ffffffff81bace8d RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900220c2000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900095f7ab0 R08: ffffffff90572237 R09: 1ffffffff20ae446
R10: dffffc0000000000 R11: ffffffff8174e150 R12: 1ffff11024208611
R13: ffff88823c63c448 R14: ffff888121043088 R15: 0000000000000000
FS:  00007ff9bf4606c0(0000) GS:ffff8882a8f5c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f417ff8 CR3: 00000001710c6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 clock_was_set+0x715/0x7e0
 do_adjtimex+0x25d/0x370
 __x64_sys_clock_adjtime+0x252/0x340
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9be59e0d9
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:00007ff9bf460028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007ff9be825fa0 RCX: 00007ff9be59e0d9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007ff9be635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff9be826038 R14: 00007ff9be825fa0 R15: 00007fff14159b78
 </TASK>
