rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=df44/1/0x4000000000000000 softirq=32676/32677 fqs=1
rcu: 	(detected by 0, t=10505 jiffies, g=26681, q=123 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9833 Comm: syz.4.1111 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:mark_lock+0x96/0x190
Code: 3d 92 39 06 0e 00 75 19 90 48 c7 c7 f5 80 ba 8d 48 c7 c6 de cd a9 8d e8 78 bc e5 ff 90 0f 0b 90 90 90 31 c9 4c 89 fe 4c 89 f7 <b8> 01 00 00 00 85 69 60 74 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 11
RSP: 0018:ffffc900001e0718 EFLAGS: 00000006
RAX: 0000000000005078 RBX: 0000000000000000 RCX: ffffffff9349c388
RDX: 0000000000000000 RSI: ffff88802e18e130 RDI: ffff88802e18d640
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ada58b
R10: dffffc0000000000 R11: ffffed1026cc4f51 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88802e18e130 R15: 0000000000000000
FS:  00007f94119f66c0(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000128cc6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_acquire+0x65a/0xd20
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 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+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:stack_trace_consume_entry+0x51/0x280
Code: 0f b6 44 15 00 84 c0 0f 85 09 01 00 00 44 8b 4f 10 4c 8d 77 08 4d 89 f5 49 c1 ed 03 41 0f b6 44 15 00 84 c0 0f 85 22 01 00 00 <45> 3b 0e 73 3a 48 8d 5f 0c 49 89 df 49 c1 ef 03 41 0f b6 04 17 84
RSP: 0018:ffffc900043af378 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900043af480 RCX: fb8cfe1b0330d500
RDX: dffffc0000000000 RSI: ffffffff8222f8ce RDI: ffffc900043af480
RBP: 1ffff92000875e92 R08: ffffc900043af490 R09: 0000000000000000
R10: ffffc900043af418 R11: ffffffff81ac4b00 R12: ffff88802e18d640
R13: 1ffff92000875e91 R14: ffffc900043af488 R15: ffffc900043af3c8
 arch_stack_walk+0x110/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 kmem_cache_free+0x166/0x400
 __fput_deferred+0x227/0x390
 fput_close+0x119/0x200
 path_openat+0x313c/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f941378ec29
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:00007f94119f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f94139d5fa0 RCX: 00007f941378ec29
RDX: 0000000000200002 RSI: 0000200000000200 RDI: ffffffffffffffff
RBP: 00007f9413811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94139d6038 R14: 00007f94139d5fa0 R15: 00007fffe9848588
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g26681 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:27160 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: 9834 Comm: syz.4.1111 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 56 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 01 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 e5 5e
RSP: 0018:ffffc900033bf540 EFLAGS: 00000246
RAX: ffffffff81b4601b RBX: 1ffff11026cc7f61 RCX: 0000000000080000
RDX: ffffc90022ee0000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900033bf6c0 R08: ffffffff8fa3a637 R09: 1ffffffff1f474c6
R10: dffffc0000000000 R11: fffffbfff1f474c7 R12: ffff88813663fb08
R13: dffffc0000000000 R14: ffff88804b03b1c0 R15: 0000000000000001
FS:  00007f94119d56c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94119d4fc8 CR3: 0000000128cc6000 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
 dup_mmap+0x15a0/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f941378ec29
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:00007f94119d4fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f94139d6090 RCX: 00007f941378ec29
RDX: 00002000000005c0 RSI: 0000200000000580 RDI: 0000000000000200
RBP: 00007f9413811e41 R08: 0000200000000640 R09: 0000200000000640
R10: 0000200000000600 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f94139d6128 R14: 00007f94139d6090 R15: 00007fffe9848588
 </TASK>
