FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 1 PID: 7044 Comm: syz-executor2 Not tainted 4.9.52-gc30c69c #54
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c84b76f0 ffffffff81d93149[   55.089242] 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: 7079 Comm: syz-executor1 Not tainted 4.9.52-gc30c69c #54
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c79de000 task.stack: ffff8801ab5f0000
RIP: 0010:[<ffffffff8144df71>] 
 [<ffffffff8144df71>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff8144df71>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
 [<ffffffff8144df71>] page_ref_count include/linux/page_ref.h:66 [inline]
 [<ffffffff8144df71>] put_page_testzero include/linux/mm.h:445 [inline]
 [<ffffffff8144df71>] __free_pages+0x21/0x80 mm/page_alloc.c:3901
RSP: 0018:ffff8801ab5f79b0  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffc900010f7000
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801ab5f79c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff100356bef18 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801d83fa100 R15: dffffc0000000000
FS:  00007fed12e88700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000206ff000 CR3: 00000001a767d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c79de000
 ffff8801d83fa258 ffff8801ab5f7a20 ffffffff82661ed1[   55.089374]  ffff8801d83fa270
 ffffed003b07f44b ffffed003b07f44e ffff8801d83fa268[   55.089386]  dead4ead00000000
 ffff8801d83fa240 0000000000000000 0000000000000000[   55.089397] Call Trace:
 [<ffffffff82661ed1>] sg_remove_scat.isra.20+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff82662295>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836
 [<ffffffff82662359>] sg_new_read.isra.21+0x39/0x3e0 drivers/scsi/sg.c:567
 [<ffffffff82663f36>] sg_read+0x8a6/0x1400 drivers/scsi/sg.c:456
 [<ffffffff8156b741>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156f510>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156f510>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156f7c4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156f8e6>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff81572ca7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff81572ca7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838ac5c5>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 
ff 66 0f 1f 84 00 00 00 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 [   55.089755] RIP 
 [<ffffffff8144df71>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff8144df71>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
 [<ffffffff8144df71>] page_ref_count include/linux/page_ref.h:66 [inline]
 [<ffffffff8144df71>] put_page_testzero include/linux/mm.h:445 [inline]
 [<ffffffff8144df71>] __free_pages+0x21/0x80 mm/page_alloc.c:3901
---[ end trace 9f5611cfe270e5e9 ]---
Kernel panic - not syncing: Fatal exception
 ffff8801c84b79d0 0000000000000000
 ffff8801c96dcd10 ffff8801c84b78c0 ffff8801c96dcc00 ffff8801c84b78e8
 ffffffff81660dc8 ffff8801c84b7840 0000000000000046 00000001cf58f067
Call Trace:
 [<ffffffff81d93149>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93149>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81660dc8>] handle_userfault+0xa48/0x1300 fs/userfaultfd.c:323
 [<ffffffff814cfd71>] do_anonymous_page mm/memory.c:2747 [inline]
 [<ffffffff814cfd71>] handle_pte_fault mm/memory.c:3488 [inline]
 [<ffffffff814cfd71>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814cfd71>] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614
 [<ffffffff810e020b>] __do_page_fault+0x4eb/0xbd0 arch/x86/mm/fault.c:1397
 [<ffffffff810e0917>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1460
 [<ffffffff838ad798>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012
 [<ffffffff815ace0a>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815ace0a>] do_vfs_ioctl+0x1aa/0x10c0 fs/ioctl.c:679
 [<ffffffff815addaf>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815addaf>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006527>] do_syscall_64+0x197/0x490 arch/x86/entry/common.c:280
 [<ffffffff838ac68d>] entry_SYSCALL64_slow_path+0x25/0x25
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..