FAT-fs (loop6): Can't find a valid FAT filesystem
FAT-fs (loop5): bogus number of reserved sectors
FAT-fs (loop5): Can't find a valid FAT filesystem
usercopy: Kernel memory exposure attempt detected from SLAB object 'kmalloc-4194304' (offset 4194290, size 924)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:100!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 0 PID: 31021 Comm: syz-executor4 Not tainted 4.18.0-rc4-next-20180711+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:88
Code: c0 e8 d7 d2 b8 ff ff 75 c8 48 8b 55 c0 4d 89 f9 ff 75 d0 4d 89 e8 48 89 d9 4c 89 e6 41 56 48 c7 c7 20 53 f3 87 e8 77 87 9f ff <0f> 0b e8 ac d2 b8 ff e8 67 3f f7 ff 4c 89 e1 8b 95 14 ff ff ff 31 
RSP: 0018:ffff8801cacf79a8 EFLAGS: 00010286
RAX: 0000000000000070 RBX: ffffffff88c03cd0 RCX: ffffc90009262000
RDX: 0000000000000000 RSI: ffffffff81634131 RDI: 0000000000000001
RBP: ffff8801cacf7a00 R08: ffff8801c7acc640 R09: ffffed003b5c4fc0
R10: ffffed003b5c4fc0 R11: ffff8801dae27e07 R12: ffffffff87f35200
R13: ffffffff87f350c0 R14: ffffffff87f35080 R15: ffffffff88bff7de
FS:  00007fafeb440700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc94e4d060 CR3: 00000001c574f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __check_heap_object+0xb5/0xb5 mm/slab.c:4445
 check_heap_object mm/usercopy.c:236 [inline]
 __check_object_size+0x4db/0x5f2 mm/usercopy.c:259
 check_object_size include/linux/thread_info.h:119 [inline]
 check_copy_size include/linux/thread_info.h:150 [inline]
 copy_to_user include/linux/uaccess.h:154 [inline]
 bpf_test_finish.isra.7+0xd9/0x1f0 net/bpf/test_run.c:59
 bpf_prog_test_run_skb+0x7d7/0xa30 net/bpf/test_run.c:144
 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1688
 __do_sys_bpf kernel/bpf/syscall.c:2325 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:2269 [inline]
 __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2269
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455e29
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:00007fafeb43fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fafeb4406d4 RCX: 0000000000455e29
RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bbaee R14: 00000000004c8d20 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 9e8e975aca65b5b7 ]---
RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:88
Code: c0 e8 d7 d2 b8 ff ff 75 c8 48 8b 55 c0 4d 89 f9 ff 75 d0 4d 89 e8 48 89 d9 4c 89 e6 41 56 48 c7 c7 20 53 f3 87 e8 77 87 9f ff <0f> 0b e8 ac d2 b8 ff e8 67 3f f7 ff 4c 89 e1 8b 95 14 ff ff ff 31 
RSP: 0018:ffff8801cacf79a8 EFLAGS: 00010286
RAX: 0000000000000070 RBX: ffffffff88c03cd0 RCX: ffffc90009262000
RDX: 0000000000000000 RSI: ffffffff81634131 RDI: 0000000000000001
RBP: ffff8801cacf7a00 R08: ffff8801c7acc640 R09: ffffed003b5c4fc0
R10: ffffed003b5c4fc0 R11: ffff8801dae27e07 R12: ffffffff87f35200
R13: ffffffff87f350c0 R14: ffffffff87f35080 R15: ffffffff88bff7de
FS:  00007fafeb440700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc94e4d060 CR3: 00000001c574f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400