BUG: unable to handle kernel paging request at 0000000007b634e8
PGD 800000013c3b2067 P4D 800000013c3b2067 PUD 13bcd1067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 26844 Comm: syz-executor5 Not tainted 4.18.0-rc4+ #27
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:ffff8800a60bf618 EFLAGS: 00010246
RAX: ffff8800a8ae1f90 RBX: 0000000007b634e8 RCX: ffff8800a8ae0f90
RDX: ffff8800a8ae0f90 RSI: aaaaaaaaaaaab000 RDI: ffffea0003dc43a0
RBP: ffff8800a60bf6c0 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000cfc00078 R15: 0000000007b634e0
FS:  0000000001a6a940(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000007b634e8 CR3: 000000013bc76000 CR4: 00000000001406e0
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:3105
 __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
 __do_sys_exit_group+0x21/0x30 kernel/exit.c:981
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:979
 __x64_sys_exit_group+0x4c/0x50 kernel/exit.c:979
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 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:0000000000a3ea98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000455ab9
RDX: 000000000040fb91 RSI: fffffffffffffff7 RDI: 0000000000000000
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000a3ea30 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000a3f160 R15: 00000000007034c0
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000007b634e8
---[ end trace 722aa412d5173914 ]---
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:ffff8800a60bf618 EFLAGS: 00010246
RAX: ffff8800a8ae1f90 RBX: 0000000007b634e8 RCX: ffff8800a8ae0f90
RDX: ffff8800a8ae0f90 RSI: aaaaaaaaaaaab000 RDI: ffffea0003dc43a0
RBP: ffff8800a60bf6c0 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000cfc00078 R15: 0000000007b634e0
FS:  0000000001a6a940(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000007b634e8 CR3: 000000013bc76000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600