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kernel BUG at mm/vmalloc.c:1538!
invalid opcode: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 9861 Comm: syz-executor1 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__vunmap+0xd6/0x150 mm/vmalloc.c:1538
RSP: 0000:ffffc90000e1fd70 EFLAGS: 00010293
RAX: ffff8801de694240 RBX: ffff8801dffd8400 RCX: ffffffff813b55a6
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000286
RBP: ffffc90000e1fd90 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801dffcd1c0
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8802174263b0
FS:  0000000000f41940(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd2a96bff8 CR3: 00000001de7dd000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 vfree+0x4c/0xa0 mm/vmalloc.c:1606
 kcov_put+0x16/0x30 kernel/kcov.c:237
 kcov_close+0x10/0x20 kernel/kcov.c:322
 __fput+0x120/0x270 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0xa3/0xe0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x3e6/0x1050 kernel/exit.c:869
 do_group_exit+0x60/0x100 kernel/exit.c:972
 SYSC_exit_group kernel/exit.c:983 [inline]
 SyS_exit_group+0x18/0x20 kernel/exit.c:981
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007ffdb2abec68 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007ffdb2abc510 RCX: 0000000000452a39
RDX: 000000000040cc30 RSI: 0000000000a74bd0 RDI: 0000000000000045
RBP: 00007ffdb2abc4e0 R08: 000000000000000b R09: 0000000000001032
R10: 0000000000f41940 R11: 0000000000000202 R12: 00000000004b7204
R13: 00007ffdb2abeba8 R14: 0000000000000000 R15: 0000000000000000
Code: ef 83 c3 01 e8 cc a6 f9 ff 41 39 5c 24 28 76 41 e8 b0 4d f0 ff 49 8b 54 24 20 48 63 c3 4c 8b 2c c2 4d 85 ed 75 d1 e8 9a 4d f0 ff <0f> 0b e8 93 4d f0 ff 48 89 de 48 c7 c7 a0 26 e6 82 e8 84 c9 e0 
RIP: __vunmap+0xd6/0x150 mm/vmalloc.c:1538 RSP: ffffc90000e1fd70
---[ end trace ee21aa23097c1a7b ]---