BUG: unable to handle kernel paging request at 0000008c956d8011
PGD 0 P4D 0 
Oops: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4237 Comm: syz-executor1 Not tainted 4.17.0+ #17
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:radix_tree_load_root lib/radix-tree.c:603 [inline]
RIP: 0010:__radix_tree_lookup lib/radix-tree.c:1040 [inline]
RIP: 0010:radix_tree_lookup_slot+0x76/0x500 lib/radix-tree.c:1079
RSP: 0018:ffff88009788f180 EFLAGS: 00010246
RAX: ffffffff89f68f46 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffc90001d9b000 RSI: 00000000000000c2 RDI: 00000000000000c3
RBP: ffff88009788f220 R08: 0000000001080020 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801900da618 R14: 0000008c956d8011 R15: 0000008c956d8009
FS:  00007fce83a13700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000008c956d8011 CR3: 0000000092884000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 find_get_entry+0xda/0x820 mm/filemap.c:1431
 pagecache_get_page+0x1a1/0x1450 mm/filemap.c:1541
 find_get_page include/linux/pagemap.h:272 [inline]
 lookup_swap_cache+0x117/0x6c0 mm/swap_state.c:341
 shmem_getpage_gfp+0xecc/0x59c0 mm/shmem.c:1665
 shmem_fault+0x509/0x950 mm/shmem.c:2020
 __do_fault mm/memory.c:3224 [inline]
 do_shared_fault mm/memory.c:3689 [inline]
 do_fault mm/memory.c:3738 [inline]
 handle_pte_fault mm/memory.c:3965 [inline]
 __handle_mm_fault mm/memory.c:4089 [inline]
 handle_mm_fault+0x3970/0x7ed0 mm/memory.c:4126
 __do_page_fault+0xec6/0x1a10 arch/x86/mm/fault.c:1400
 do_page_fault+0xb7/0x250 arch/x86/mm/fault.c:1477
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1167
RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:66
RSP: 0018:ffff88009788fc70 EFLAGS: 00010206
RAX: ffffffff83ffc77b RBX: 0000000020001100 RCX: 0000000000000005
RDX: 0000000000000000 RSI: ffff88009788fd10 RDI: 00000000200011c0
RBP: ffff88009788fcd8 R08: 00007d003d090000 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff83a56da0 R12: 0000000000000000
R13: ffff88009788fc78 R14: 0000000000000000 R15: ffff8801900da618
 copy_to_user include/linux/uaccess.h:183 [inline]
 semctl_info+0x50e/0x600 ipc/sem.c:1303
 ksys_semctl+0x528/0x640 ipc/sem.c:1631
 __do_sys_semctl ipc/sem.c:1671 [inline]
 __se_sys_semctl ipc/sem.c:1669 [inline]
 __x64_sys_semctl+0x11e/0x170 ipc/sem.c:1669
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
RSP: 002b:00007fce83a12c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000042
RAX: ffffffffffffffda RBX: 00007fce83a136d4 RCX: 0000000000455ab9
RDX: 0000000000000013 RSI: 0000000000000003 RDI: 0000000000018002
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000200011c0 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0c6c R14: 00000000004d0c68 R15: 0000000000000000
Code: c6 08 4c 89 75 88 48 89 5d 90 48 85 c9 74 1c e9 7b 03 00 00 90 e8 ab 4f 6f f7 4c 8b 75 88 48 8b 4d 90 48 85 c9 0f 85 64 03 00 00 <4d> 8b 26 4c 89 f7 e8 af 12 ca f7 48 8b 08 8b 02 89 45 d4 48 89 
RIP: __read_once_size include/linux/compiler.h:197 [inline] RSP: ffff88009788f180
RIP: radix_tree_load_root lib/radix-tree.c:603 [inline] RSP: ffff88009788f180
RIP: __radix_tree_lookup lib/radix-tree.c:1040 [inline] RSP: ffff88009788f180
RIP: radix_tree_lookup_slot+0x76/0x500 lib/radix-tree.c:1079 RSP: ffff88009788f180
CR2: 0000008c956d8011
---[ end trace 45452d65cd1bd81a ]---