BUG: unable to handle kernel paging request at 0000000008661788
PGD 8000000140e60067 P4D 8000000140e60067 PUD 140e63067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 7827 Comm: syz-executor1 Not tainted 4.18.0-rc8+ #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:338 [inline]
RIP: 0010:free_swap_cache mm/swap_state.c:290 [inline]
RIP: 0010:free_pages_and_swap_cache+0xff/0x570 mm/swap_state.c:318
Code: ff 4c 8b 38 48 89 85 60 ff ff ff 48 89 c7 e8 98 c5 0c 00 4c 8b 20 44 8b 32 49 8d 5f 08 4d 85 e4 0f 85 f8 01 00 00 44 89 75 d0 <4d> 8b 77 08 48 89 9d 68 ff ff ff 48 89 df e8 6e c5 0c 00 4c 8b 28 
RSP: 0018:ffff88012adef190 EFLAGS: 00010246
RAX: ffff8801974f6f90 RBX: 0000000008661788 RCX: ffff880127261f90
RDX: ffff880127261f90 RSI: aaaaaaaaaaaab000 RDI: ffffea0006f569a0
RBP: ffff88012adef230 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000b9a000b2 R15: 0000000008661780
FS:  0000000002103940(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000008661788 CR3: 0000000140f28000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tlb_flush_mmu_free mm/memory.c:260 [inline]
 zap_pte_range mm/memory.c:1401 [inline]
 zap_pmd_range mm/memory.c:1436 [inline]
 zap_pud_range mm/memory.c:1465 [inline]
 zap_p4d_range mm/memory.c:1486 [inline]
 unmap_page_range+0x34a8/0x3b60 mm/memory.c:1507
 unmap_single_vma+0x445/0x5e0 mm/memory.c:1552
 unmap_vmas+0x241/0x370 mm/memory.c:1582
 exit_mmap+0x4d7/0x960 mm/mmap.c:3094
 __mmput+0x154/0x5f0 kernel/fork.c:994
 mmput+0xa7/0xe0 kernel/fork.c:1015
 exit_mm+0x6dd/0x790 kernel/exit.c:545
 do_exit+0xbf7/0x3890 kernel/exit.c:854
 do_group_exit+0x1a0/0x350 kernel/exit.c:970
 get_signal+0x1425/0x1ef0 kernel/signal.c:2468
 do_signal+0x120/0x2090 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x273/0x410 arch/x86/entry/common.c:197
 syscall_return_slowpath+0xdb/0x700 arch/x86/entry/common.c:268
 do_syscall_64+0x1ab/0x220 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:0000000000a3fc18 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 0000000000000635 RCX: 0000000000457089
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00000000009300a8
RBP: 00000000009300a0 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000246 R12: 00000000009300ac
R13: 00000000009300ac R14: 0000000000000006 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000008661788
---[ end trace e6e99e77a538130d ]---
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:PageSwapCache include/linux/page-flags.h:338 [inline]
RIP: 0010:free_swap_cache mm/swap_state.c:290 [inline]
RIP: 0010:free_pages_and_swap_cache+0xff/0x570 mm/swap_state.c:318
Code: ff 4c 8b 38 48 89 85 60 ff ff ff 48 89 c7 e8 98 c5 0c 00 4c 8b 20 44 8b 32 49 8d 5f 08 4d 85 e4 0f 85 f8 01 00 00 44 89 75 d0 <4d> 8b 77 08 48 89 9d 68 ff ff ff 48 89 df e8 6e c5 0c 00 4c 8b 28 
RSP: 0018:ffff88012adef190 EFLAGS: 00010246
RAX: ffff8801974f6f90 RBX: 0000000008661788 RCX: ffff880127261f90
RDX: ffff880127261f90 RSI: aaaaaaaaaaaab000 RDI: ffffea0006f569a0
RBP: ffff88012adef230 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000b9a000b2 R15: 0000000008661780
FS:  0000000002103940(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000008661788 CR3: 0000000140f28000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400