syzbot

sg_write: data in/out 1969188161/43 bytes for SCSI command 0x79-- guessing data in;
   program syzkaller821304 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: 0 PID: 3804 Comm: syzkaller821304 Not tainted 4.9.88-g71df7bb #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b49a4800 task.stack: ffff8801d7a60000
RIP: 0010:[<ffffffff8266c076>]  [<ffffffff8266c076>] sg_read_oxfer drivers/scsi/sg.c:1966 [inline]
RIP: 0010:[<ffffffff8266c076>]  [<ffffffff8266c076>] sg_read+0xd06/0x1440 drivers/scsi/sg.c:519
RSP: 0018:ffff8801d7a67a50  EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8266c03d
RDX: 0000000000000000 RSI: 0000000000010000 RDI: ffff8801d85e4370
RBP: ffff8801d7a67b60 R08: 0000000000000000 R09: ffffed0039a6bfc1
R10: 0000000000000005 R11: ffffed0039a6bfc0 R12: 0000000000001000
R13: 0000000000000000 R14: ffff8801cd35fde0 R15: ffff8801d85e4340
FS:  000000000118e880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020e94000 CR3: 00000001da3dc000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff844de420 0000000000000105 ffff8801d85e4358 ffff880100010000
 0000000000000246 ffff8801d85e4368 0000000000010024 ffffffff83be4b20
 ffff8801cfe6a780 1ffff1003af4cf56 0000000020e94000 0000000020e94024
Call Trace:
 [<ffffffff8156d338>] do_loop_readv_writev.part.17+0xc8/0x2b0 fs/read_write.c:715
 [<ffffffff8157147d>] do_loop_readv_writev fs/read_write.c:879 [inline]
 [<ffffffff8157147d>] do_readv_writev+0x5fd/0x740 fs/read_write.c:873
 [<ffffffff81571644>] vfs_readv+0x84/0xc0 fs/read_write.c:897
 [<ffffffff81571766>] do_readv+0xe6/0x250 fs/read_write.c:923
 [<ffffffff81574c37>] SYSC_readv fs/read_write.c:1010 [inline]
 [<ffffffff81574c37>] SyS_readv+0x27/0x30 fs/read_write.c:1007
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b7a53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
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 
RIP  [<ffffffff8266c076>] sg_read_oxfer drivers/scsi/sg.c:1966 [inline]
RIP  [<ffffffff8266c076>] sg_read+0xd06/0x1440 drivers/scsi/sg.c:519
 RSP <ffff8801d7a67a50>
---[ end trace 75e80ff0823e62af ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..