rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=e104/1/0x4000000000000000 softirq=23330/23335 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5830/3:b..l P7603/1:b..l
rcu: 	(detected by 1, t=10505 jiffies, g=15617, q=175 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7602 Comm: syz.0.490 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:validate_chain+0xaa/0x2140
Code: dc a5 e5 ff 90 0f 0b 90 90 90 48 bb eb 83 b5 80 46 86 c8 61 49 0f af df 48 c1 eb 2d 48 8b 04 dd 40 93 64 93 48 85 c0 0f 94 c1 <48> 83 c0 f8 0f 94 c2 08 ca 0f 84 24 01 00 00 e8 e2 9b ff ff 83 3d
RSP: 0018:ffffc90000007638 EFLAGS: 00000086
RAX: ffffffff93a8b018 RBX: 000000000002c50a RCX: 0000000000040000
RDX: 0000000000000001 RSI: ffff888101a86130 RDI: ffff888101a85640
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000000001
R13: ffff888101a86130 R14: ffff888101a86130 R15: d6bf87c490213bdc
FS:  00007f9ababa36c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 0000000028356000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_acquire+0xab9/0xd20
 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:x64_sys_call+0x62/0x2200
Code: 00 83 fe 27 0f 8f 8b 0f 00 00 83 fe 25 0f 8f c4 1c 00 00 83 fe 24 0f 84 cc 56 7d 00 83 fe 25 0f 84 53 60 7d 00 e9 5c 21 00 00 <81> fe 60 01 00 00 0f 8f ca 00 00 00 81 fe 25 01 00 00 0f 8e c0 01
RSP: 0018:ffffc90002e0fee8 EFLAGS: 00000216
RAX: 0910cb28a93f4a00 RBX: ffffc90002e0fef0 RCX: 0910cb28a93f4a00
RDX: 0000000000000000 RSI: 0000000000000141 RDI: ffffc90002e0ff58
RBP: ffffc90002e0ff48 R08: ffffffff8fa3a837 R09: 1ffffffff1f47506
R10: dffffc0000000000 R11: fffffbfff1f47507 R12: 0000000000000141
R13: 0000000000000141 R14: ffffc90002e0ff58 R15: ffff888101a85640
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ab9d8eba9
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:00007f9ababa3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f9ab9fd5fa0 RCX: 00007f9ab9d8eba9
RDX: 0000000000000050 RSI: 0000200000001600 RDI: 0000000000000000
RBP: 00007f9ab9e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ab9fd6038 R14: 00007f9ab9fd5fa0 R15: 00007ffda545d0c8
 </TASK>
task:syz.1.491       state:R  running task     stack:25512 pid:7603  tgid:7603  ppid:5847   task_flags:0x400040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_notrace+0xd1/0x110
 preempt_schedule_notrace_thunk+0x16/0x30
 rcu_is_watching+0x7f/0xb0
 lock_release+0x4b/0x3e0
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0x157/0x9c0
 mas_wr_store_entry+0x1f1b/0x25b0
 mas_store_prealloc+0xb00/0xf60
 mmap_region+0x1b5e/0x20c0
 do_mmap+0xc45/0x10d0
 vm_mmap_pgoff+0x2a6/0x4d0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e12b8ebe3
RSP: 002b:00007fffbbe03ac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f6e115f76c0 RCX: 00007f6e12b8ebe3
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007fffbbe03c20
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
 </TASK>
task:sshd            state:R  running task     stack:23320 pid:5830  tgid:5830  ppid:5668   task_flags:0x400100 flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 __local_bh_enable_ip+0x13e/0x1c0
 __dev_queue_xmit+0x1d79/0x3b50
 ip_finish_output2+0xd03/0x1160
 ip_output+0x2a1/0x3c0
 __ip_queue_xmit+0x1106/0x1b00
 __tcp_transmit_skb+0x2215/0x3680
 tcp_write_xmit+0x1862/0x67f0
 __tcp_push_pending_frames+0x97/0x360
 tcp_sendmsg_locked+0x4afd/0x5620
 tcp_sendmsg+0x2f/0x50
 __sock_sendmsg+0x19c/0x270
 sock_write_iter+0x258/0x330
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d5b516bf2
RSP: 002b:00007ffc960406f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000055d5cdbd55e0 RCX: 00007f1d5b516bf2
RDX: 00000000000010c0 RSI: 000055d5cdc347a0 RDI: 0000000000000007
RBP: 000055d5cdc347a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000010c0
R13: 000055d5cdbd4460 R14: 000055d5cdbcf220 R15: 000055d5cdbd5ff0
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g15617 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:26920 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: 1 UID: 0 PID: 7599 Comm: syz.2.489 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:__sanitizer_cov_trace_pc+0x8/0x70
Code: 8b 3d f4 73 fe 0b 48 89 de 5b e9 73 ac 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 d0 a0 92 65 8b 15 18 0f e1 10 81 e2 00 01 ff 00
RSP: 0018:ffffc9000318f6b8 EFLAGS: 00000202
RAX: ffffffff81b4621b RBX: 1ffff11009608341 RCX: ffff8881071bb980
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000318f840 R08: ffff88811051aa47 R09: 1ffff110220a3548
R10: dffffc0000000000 R11: ffffed10220a3549 R12: ffff88804b041a08
R13: dffffc0000000000 R14: ffff88813663b1c0 R15: 0000000000000000
FS:  000055558a1ad500(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3231cff8 CR3: 0000000028356000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 smp_call_function_many_cond+0xd4b/0x12d0
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x6b1/0x12d0
 tlb_flush_mmu+0x1a7/0x680
 tlb_finish_mmu+0xc3/0x1d0
 exit_mmap+0x44c/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: 0033:0x7f105778eba9
Code: Unable to access opcode bytes at 0x7f105778eb7f.
RSP: 002b:00007ffe73397e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f105778eba9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe73397e9c R08: 0000000b73397f2f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000009f
R13: 00000000000927c0 R14: 0000000000028c9b R15: 00007ffe73397ef0
 </TASK>
