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: 3526 Comm: syzkaller368305 Not tainted 4.9.71-g2506378 #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c499c800 task.stack: ffff8801c3d70000
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
RSP: 0018:ffff8801c3d775e0  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664deb
RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c
RBP: ffff8801c3d775f0 R08: ffffed00388e16dc R09: ffff8801c470b6c0
R10: 0000000000000005 R11: ffffed00388e16dc R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801c7862100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f76dab40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020df7000 CR3: 00000001c78d7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffff8801c7862258 ffff8801c3d77650 ffffffff82664e11
 ffff8801c7862270 ffffed0038f0c44b ffffed0038f0c44e ffff8801c7862268
 dead4ead00000000 ffff8801c7862240 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82664e11>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff826651d5>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836
 [<ffffffff82666fec>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff8156a4e1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156e350>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156e350>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156e604>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8160d6bf>] kernel_readv fs/splice.c:363 [inline]
 [<ffffffff8160d6bf>] default_file_splice_read+0x43f/0x7a0 fs/splice.c:435
 [<ffffffff8160c7ba>] do_splice_to+0x10a/0x160 fs/splice.c:899
 [<ffffffff8161252f>] do_splice fs/splice.c:1192 [inline]
 [<ffffffff8161252f>] SYSC_splice fs/splice.c:1416 [inline]
 [<ffffffff8161252f>] SyS_splice+0xf5f/0x1520 fs/splice.c:1399
 [<ffffffff81006fc7>] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline]
 [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384
 [<ffffffff838b05e1>] entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124
Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d 
RIP  [<ffffffff8144d081>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144d081>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144d081>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144d081>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144d081>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
 RSP <ffff8801c3d775e0>
---[ end trace 34be35124951ba1a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..