BUG: unable to handle kernel paging request at 0000000007ce83a8
PGD 800000013eb32067 P4D 800000013eb32067 PUD 13eb36067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 30719 Comm: syz-executor4 Not tainted 4.18.0-rc5+ #29
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+0x11f/0x5b0 mm/swap_state.c:318
Code: ff 4c 8b 38 48 89 85 58 ff ff ff 48 89 c7 e8 28 22 0d 00 4c 8b 20 44 8b 32 49 8d 5f 08 4d 85 e4 0f 85 08 02 00 00 44 89 75 c8 <4d> 8b 77 08 48 89 9d 60 ff ff ff 48 89 df e8 fe 21 0d 00 4c 8b 28 
RSP: 0018:ffff88009bcdf158 EFLAGS: 00010246
RAX: ffff88009ca78f90 RBX: 0000000007ce83a8 RCX: ffff88009ca79f90
RDX: ffff88009ca79f90 RSI: aaaaaaaaaaaab000 RDI: ffffea00038e37a0
RBP: ffff88009bcdf200 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000c48000bf R15: 0000000007ce83a0
FS:  00007f3b805e5700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000007ce83a8 CR3: 000000013e590000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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:1438 [inline]
 zap_pud_range mm/memory.c:1467 [inline]
 zap_p4d_range mm/memory.c:1488 [inline]
 unmap_page_range+0x3217/0x3c00 mm/memory.c:1509
 unmap_single_vma+0x445/0x5e0 mm/memory.c:1554
 unmap_vmas+0x1f4/0x360 mm/memory.c:1584
 exit_mmap+0x570/0xad0 mm/mmap.c:3100
 __mmput+0x165/0x620 kernel/fork.c:971
 mmput+0xbb/0x110 kernel/fork.c:992
 exit_mm+0x6bb/0x7c0 kernel/exit.c:545
 do_exit+0xc12/0x3930 kernel/exit.c:854
 do_group_exit+0x1a0/0x360 kernel/exit.c:970
 get_signal+0x15c3/0x2190 kernel/signal.c:2468
 do_signal+0xca/0x2060 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline]
 prepare_exit_to_usermode+0x297/0x430 arch/x86/entry/common.c:197
 syscall_return_slowpath+0x108/0x800 arch/x86/entry/common.c:268
 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f3b805e4ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf68 RCX: 0000000000455ab9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf68
RBP: 000000000072bf68 R08: 0000000000000000 R09: 000000000072bf48
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e80f R14: 00007f3b805e59c0 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000007ce83a8
---[ end trace 9091c9079938e6f4 ]---
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+0x11f/0x5b0 mm/swap_state.c:318
Code: ff 4c 8b 38 48 89 85 58 ff ff ff 48 89 c7 e8 28 22 0d 00 4c 8b 20 44 8b 32 49 8d 5f 08 4d 85 e4 0f 85 08 02 00 00 44 89 75 c8 <4d> 8b 77 08 48 89 9d 60 ff ff ff 48 89 df e8 fe 21 0d 00 4c 8b 28 
RSP: 0018:ffff88009bcdf158 EFLAGS: 00010246
RAX: ffff88009ca78f90 RBX: 0000000007ce83a8 RCX: ffff88009ca79f90
RDX: ffff88009ca79f90 RSI: aaaaaaaaaaaab000 RDI: ffffea00038e37a0
RBP: ffff88009bcdf200 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000c48000bf R15: 0000000007ce83a0
FS:  00007f3b805e5700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000007ce83a8 CR3: 000000013e590000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600