BUG: unable to handle page fault for address: ffffde20276ec1cb
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3933 Comm: syz-executor.4 Not tainted 5.2.0-rc1+ #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:iptunnel_xmit_stats include/net/ip_tunnels.h:444 [inline]
RIP: 0010:iptunnel_xmit+0x6e5/0x970 net/ipv4/ip_tunnel_core.c:94
Code: c1 e9 03 80 3c 11 00 0f 85 72 02 00 00 48 03 1c c5 60 e2 74 88 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5d 02 00 00 48 8d 7b 10 4d 63 e4 48 b8 00 00 00
RSP: 0018:ffff8880ae809878 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: ffff11013b760e40 RCX: 1ffffffff10e9c4c
RDX: 1fffe220276ec1cb RSI: ffffffff83355e3c RDI: ffff11013b760e58
RBP: ffff8880ae8098d8 R08: ffff88808f3aa200 R09: ffffed1015d06be0
R10: ffffed1015d06bdf R11: ffff8880ae835efb R12: 00000000000000fc
R13: ffff8880a7ac8940 R14: ffff888096c7a9d4 R15: ffff88809f8d25c0
FS:  00007f5482770700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffde20276ec1cb CR3: 00000000a4c32000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 udp_tunnel_xmit_skb+0x236/0x310 net/ipv4/udp_tunnel.c:192
 tipc_udp_xmit.isra.0+0x802/0xcc0 net/tipc/udp_media.c:181
 tipc_udp_send_msg+0x295/0x4a0 net/tipc/udp_media.c:247
 tipc_bearer_xmit_skb+0x16c/0x360 net/tipc/bearer.c:503
 tipc_disc_timeout+0x933/0xd60 net/tipc/discover.c:332
 call_timer_fn+0x193/0x720 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x66f/0x1740 kernel/time/timer.c:1698
 __do_softirq+0x25c/0x94c kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:374 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:414
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:PageSwapBacked include/linux/page-flags.h:336 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:381 [inline]
RIP: 0010:free_swap_cache mm/swap_state.c:266 [inline]
RIP: 0010:free_pages_and_swap_cache+0xe7/0x3d0 mm/swap_state.c:294
Code: 08 31 ff 48 89 c6 48 89 45 b0 83 e6 01 48 89 75 c8 e8 4d 10 ce ff 48 8b 75 c8 4c 89 e7 48 85 f6 0f 85 1d 02 00 00 48 89 7d c8 <e8> 94 0e ce ff 48 8b 7d c8 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85
RSP: 0018:ffff88805e477660 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81a295c3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00024c4d00
RBP: ffff88805e4776b8 R08: ffff88808f3aa200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00024c4d00
R13: ffffea00024c4d00 R14: ffff888096013e50 R15: 00000000000001c8
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:184 [inline]
 tlb_flush_mmu+0x89/0x630 mm/mmu_gather.c:191
 zap_pte_range mm/memory.c:1160 [inline]
 zap_pmd_range mm/memory.c:1195 [inline]
 zap_pud_range mm/memory.c:1224 [inline]
 zap_p4d_range mm/memory.c:1245 [inline]
 unmap_page_range+0x17d9/0x22f0 mm/memory.c:1266
 unmap_single_vma+0x19d/0x300 mm/memory.c:1311
 unmap_vmas+0x135/0x280 mm/memory.c:1343
 exit_mmap+0x2ad/0x510 mm/mmap.c:3145
 __mmput kernel/fork.c:1059 [inline]
 mmput+0x15f/0x4c0 kernel/fork.c:1080
 exit_mm kernel/exit.c:547 [inline]
 do_exit+0x816/0x2fa0 kernel/exit.c:864
 do_group_exit+0x135/0x370 kernel/exit.c:981
 get_signal+0x41e/0x2240 kernel/signal.c:2638
 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:279 [inline]
 do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f548276fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: fffffffffffffffc RBX: 0000000000000001 RCX: 0000000000459279
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000
RBP: 000000000075c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f54827706d4
R13: 00000000004c84b7 R14: 00000000004dec10 R15: 00000000ffffffff
Modules linked in:
CR2: ffffde20276ec1cb
---[ end trace 53d17ec049f9b7f9 ]---
RIP: 0010:iptunnel_xmit_stats include/net/ip_tunnels.h:444 [inline]
RIP: 0010:iptunnel_xmit+0x6e5/0x970 net/ipv4/ip_tunnel_core.c:94
Code: c1 e9 03 80 3c 11 00 0f 85 72 02 00 00 48 03 1c c5 60 e2 74 88 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5d 02 00 00 48 8d 7b 10 4d 63 e4 48 b8 00 00 00
RSP: 0018:ffff8880ae809878 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: ffff11013b760e40 RCX: 1ffffffff10e9c4c
RDX: 1fffe220276ec1cb RSI: ffffffff83355e3c RDI: ffff11013b760e58
RBP: ffff8880ae8098d8 R08: ffff88808f3aa200 R09: ffffed1015d06be0
R10: ffffed1015d06bdf R11: ffff8880ae835efb R12: 00000000000000fc
R13: ffff8880a7ac8940 R14: ffff888096c7a9d4 R15: ffff88809f8d25c0
FS:  00007f5482770700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffde20276ec1cb CR3: 00000000a4c32000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400