program syz-executor2 not setting count and/or reply_len properly
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3728 Comm: syz-executor2 Not tainted 4.9.63-ga828714 #93
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a6219800 task.stack: ffff8801a4b78000
RIP: 0010:[<ffffffff82665a6c>] 
 [<ffffffff82665a6c>] sg_read_oxfer drivers/scsi/sg.c:1976 [inline]
 [<ffffffff82665a6c>] sg_read+0xd0c/0x1440 drivers/scsi/sg.c:520
RSP: 0018:ffff8801a4b7fac0  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900025e9000
RDX: 0000000000000000 RSI: 00000000000000d2 RDI: ffff8801a866c370
RBP: ffff8801a4b7fbc8 R08: 0000000000000007 R09: ffffed003495e179
R10: 0000000000000005 R11: ffffed003495e178 R12: 0000000000001000
R13: 0000000000000000 R14: ffff8801a4af0ba0 R15: ffff8801a866c340
FS:  00007f85e7729700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002056d000 CR3: 00000001a62c9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d57366c0
 ffff8801a4b7faf0 ffff8801a866c358 ffff8801000000d2[   23.850400]  0000000000000000
 ffff8801a866c368 00000000000000f6 0000000000000246[   23.850410]  ffff8801d1b8ca00
 1ffff1003496ff64 000000002042ff0a 000000002042ff2e[   23.850420] Call Trace:
 [<ffffffff8156cd71>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff81570be0>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff81570be0>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff81570e94>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff81570fb6>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff815744a7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff815744a7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838ad705>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 
00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 8a 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 df 05 00 00 48 8b 1b 48 85 db 0f 84 51 03 00 [   23.850755] RIP 
 [<ffffffff82665a6c>] sg_read_oxfer drivers/scsi/sg.c:1976 [inline]
 [<ffffffff82665a6c>] sg_read+0xd0c/0x1440 drivers/scsi/sg.c:520
---[ end trace 95117c3cd92a9086 ]---
Kernel panic - not syncing: Fatal exception
 ffffffff816623c7 0000000000005d9e ffff8801a49ab8f0 ffff8801a49ab8a0
Call Trace:
 [<ffffffff81d94429>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94429>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff816623c7>] handle_userfault+0xa37/0x1300 fs/userfaultfd.c:323
 [<ffffffff814d16c1>] do_anonymous_page mm/memory.c:2747 [inline]
 [<ffffffff814d16c1>] handle_pte_fault mm/memory.c:3488 [inline]
 [<ffffffff814d16c1>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814d16c1>] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614
 [<ffffffff810e1447>] __do_page_fault+0x5b7/0xd70 arch/x86/mm/fault.c:1396
 [<ffffffff810e1c27>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1460
 [<ffffffff838ae8d8>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012
 [<ffffffff81498fa8>] strndup_user+0x28/0xb0 mm/util.c:160
 [<ffffffff81bba956>] SYSC_request_key security/keys/keyctl.c:186 [inline]
 [<ffffffff81bba956>] SyS_request_key+0xd6/0x2d0 security/keys/keyctl.c:158
 [<ffffffff838ad705>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..