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WARNING: kernel/rcu/tree_stall.h:1049 at rcu_check_gp_start_stall+0x2e4/0x470, CPU#0: syz.8.875/10017
Modules linked in:
CPU: 0 UID: 0 PID: 10017 Comm: syz.8.875 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:rcu_check_gp_start_stall+0x2e4/0x470
Code: ff ff 48 c7 c7 20 65 48 9a be 04 00 00 00 e8 73 99 85 00 4c 89 f7 b8 01 00 00 00 87 05 35 0d 9d 18 85 c0 0f 85 17 ff ff ff 90 <0f> 0b 90 48 81 ff 00 29 96 8e 74 47 48 c7 c0 c0 d0 30 90 48 c1 e8
RSP: 0018:ffffc90000007d98 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffffff81ab57dd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8e962900
RBP: ffffc90000007f18 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff3490ca4 R12: 0000000000002904
R13: dffffc0000000000 R14: ffffffff8e962900 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b6f3ea4c0 CR3: 000000000e74a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 rcu_core+0x3fe/0x1070
 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 fa fc 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 a5 f8 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 8a f8 0b
RSP: 0018:ffffc90007c2f440 EFLAGS: 00000293
RAX: ffffffff81b9ab26 RBX: ffff88812103c148 RCX: ffff88811df91d80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007c2f580 R08: ffffffff90309df7 R09: 1ffffffff20613be
R10: dffffc0000000000 R11: fffffbfff20613bf R12: 1ffff110478c8169
R13: dffffc0000000000 R14: ffff88823c640b48 R15: 0000000000000001
 on_each_cpu_cond_mask+0x3f/0x80
 flush_tlb_mm_range+0x5c3/0x10b0
 tlb_flush_mmu+0x1af/0xa30
 tlb_finish_mmu+0xf9/0x230
 free_ldt_pgtables+0x19d/0x350
 exit_mmap+0x1af/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: 0033:0x7f05e935d60e
Code: Unable to access opcode bytes at 0x7f05e935d5e4.
RSP: 002b:00007ffc849e88a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 0000555590a3d500 RCX: 00007f05e935d60e
RDX: 00007ffc849e8900 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f05e9617da0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000350fb
R13: 00007f05e961609c R14: 0000000000034573 R15: 00007f05e9616090
 </TASK>
