BUG: unable to handle kernel paging request at 00000000080f8b08
PGD 8000000142da2067 P4D 8000000142da2067 PUD 142da6067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 31281 Comm: syz-executor3 Not tainted 4.19.0-rc1+ #37
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 c8 d7 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 9e d7 0c 00 4c 8b 28
RSP: 0018:ffff88009992f5d0 EFLAGS: 00010246
RAX: ffff88009dba6f90 RBX: 00000000080f8b08 RCX: ffff88009dba7f90
RDX: ffff88009dba7f90 RSI: aaaaaaaaaaaab000 RDI: ffffea000390a7a0
RBP: ffff88009992f670 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000d7a000f4 R15: 00000000080f8b00
FS:  00007fdddd3a8700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000080f8b08 CR3: 00000001428d4000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 00000000200000c0 DR2: 0000000020000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 tlb_flush_mmu_free mm/memory.c:250 [inline]
 tlb_flush_mmu+0x504/0x6b0 mm/memory.c:259
 arch_tlb_finish_mmu mm/memory.c:274 [inline]
 tlb_finish_mmu+0x205/0x420 mm/memory.c:433
 exit_mmap+0x519/0x940 mm/mmap.c:3095
 __mmput+0x154/0x5f0 kernel/fork.c:1003
 mmput+0xa7/0xe0 kernel/fork.c:1024
 exit_mm+0x6dd/0x790 kernel/exit.c:546
 do_exit+0xbf7/0x3890 kernel/exit.c:856
 do_group_exit+0x1a0/0x350 kernel/exit.c:972
 get_signal+0x1425/0x1ef0 kernel/signal.c:2513
 do_signal+0x11d/0x2060 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
 retint_user+0x8/0x8
RIP: 0033:          (null)
Code: Bad RIP value.
RSP: 002b:00000000200000c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fdddd3a86d4 RCX: 0000000000457089
RDX: 0000000020000040 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00000000009300a0 R08: 0000000020000140 R09: 0000000000000000
R10: 0000000020000100 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cb708 R14: 00000000004c316f R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 00000000080f8b08
---[ end trace 7a1618abd8fb018a ]---
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 c8 d7 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 9e d7 0c 00 4c 8b 28
RSP: 0018:ffff88009992f5d0 EFLAGS: 00010246
RAX: ffff88009dba6f90 RBX: 00000000080f8b08 RCX: ffff88009dba7f90
RDX: ffff88009dba7f90 RSI: aaaaaaaaaaaab000 RDI: ffffea000390a7a0
RBP: ffff88009992f670 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000001f1 R14: 00000000d7a000f4 R15: 00000000080f8b00
FS:  00007fdddd3a8700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001428d4000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 00000000200000c0 DR2: 0000000020000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600