rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=9f9c/1/0x4000000000000000 softirq=47526/47526 fqs=0
rcu: 	(detected by 1, t=29955 jiffies, g=35993, q=231 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8952 Comm: syz.1.820 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:__lock_acquire+0x3b3/0x2cf0
Code: 85 c0 74 1c 83 3d 10 26 8f 0e 00 75 13 48 8d 3d a3 49 92 0e 48 c7 c6 f9 ff 0b 8e 67 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 <41> 8b 45 20 25 ff 1f 00 00 48 0f a3 05 1c fe 9e 12 73 17 48 69 c0
RSP: 0018:ffffc90000007510 EFLAGS: 00000002
RAX: ffffffff93e1bae0 RBX: 0000000000000002 RCX: 000000000000001e
RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000000000000
RBP: 0000000000000009 R08: ffffffff8178b54c R09: ffffffff8e95ce20
R10: dffffc0000000000 R11: fffffbfff206131f R12: 000000000000001e
R13: ffff88816e68b1f8 R14: ffff88816e68a500 R15: ffff88816e68b090
FS:  0000000000000000(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005634e43d0000 CR3: 000000016ab0b000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000003 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350
 __virt_addr_valid+0x159/0x390
 kasan_addr_to_slab+0xf/0x70
 kasan_record_aux_stack+0xf/0xd0
 call_rcu+0xee/0x890
 xas_store+0xe88/0x1880
 xa_erase+0x6a/0xf0
 hsr_get_seq_block+0x21f/0x430
 hsr_check_duplicate+0x9e/0x170
 hsr_forward_skb+0xf6e/0x2a80
 send_hsr_supervision_frame+0x731/0xcb0
 hsr_announce+0x1db/0x370
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 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:smp_call_function_many_cond+0xfcf/0x13d0
Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 7a 05 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 25 01 0c 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 0a 01 0c
RSP: 0018:ffffc9000893f0c0 EFLAGS: 00000293
RAX: ffffffff81b9ab26 RBX: ffff88812103c148 RCX: ffff88816e68a500
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000893f200 R08: ffff888121024047 R09: 1ffff11024204808
R10: dffffc0000000000 R11: ffffffff8178d300 R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3f/0x80
 kvm_flush_tlb_multi+0x2b4/0x320
 flush_tlb_mm_range+0x5c3/0x10b0
 __zap_vma_range+0x3b7f/0x4b40
 unmap_vmas+0x379/0x530
 exit_mmap+0x280/0x9e0
 __mmput+0x118/0x430
 exit_mm+0x18e/0x250
 do_exit+0x6a2/0x22c0
 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: 0033:0x7fcd6999cdd9
Code: Unable to access opcode bytes at 0x7fcd6999cdaf.
RSP: 002b:00007fcd6a806028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 00007fcd69c15fa0 RCX: 00007fcd6999cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007
RBP: 00007fcd69a32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcd69c16038 R14: 00007fcd69c15fa0 R15: 00007fffce4dfab8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 29954 jiffies! g35993 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=7886
rcu: rcu_preempt kthread starved for 29981 jiffies! g35993 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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 stack:27536 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: 8950 Comm: syz.2.819 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:vcpu_run+0x5a02/0x7860
Code: 4c 8b a4 24 28 01 00 00 4c 89 e3 48 c1 eb 03 42 0f b6 04 3b 84 c0 0f 85 1c 0b 00 00 41 c6 04 24 01 e8 92 db 85 00 fb 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 0b eb e8 00 49 ff 06
RSP: 0018:ffffc9000889f5e0 EFLAGS: 00000206
RAX: ffff888115b0f0e0 RBX: 1ffff11022b61bf7 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa3d4e RDI: ffffffff8c28ab60
RBP: ffffc9000889f9b0 R08: ffffffff903098f7 R09: 1ffffffff206131e
R10: dffffc0000000000 R11: fffffbfff206131f R12: ffff888115b0dfba
R13: ffff888115b0d380 R14: ffff888115b0f0e0 R15: dffffc0000000000
FS:  00007ffb100c86c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000118f76000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0
 kvm_vcpu_ioctl+0xa62/0xfd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb0f19cdd9
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:00007ffb100c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffb0f415fa0 RCX: 00007ffb0f19cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007
RBP: 00007ffb0f232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb0f416038 R14: 00007ffb0f415fa0 R15: 00007ffe8e3a3c48
 </TASK>
