audit: type=1800 audit(1569832493.766:82): pid=11691 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="bus" dev="sda1" ino=17500 res=0
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
Modules linked in:
CPU: 0 PID: 11691 Comm: syz-executor.0 Not tainted 4.14.146 #0
kobject: 'loop4' (ffff8880a4ac6a60): fill_kobj_path: path = '/devices/virtual/block/loop4'
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8880501b6200 task.stack: ffff888053638000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:147 [inline]
RIP: 0010:get_page include/linux/mm.h:833 [inline]
RIP: 0010:submit_page_section fs/direct-io.c:890 [inline]
RIP: 0010:do_direct_IO fs/direct-io.c:1097 [inline]
RIP: 0010:do_blockdev_direct_IO+0x1c75/0x7fd0 fs/direct-io.c:1336
RSP: 0018:ffff88805363f4c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffffea000166381c RCX: ffffc90005e3d000
kobject: 'loop3' (ffff8880a4a7e9e0): kobject_uevent_env
RDX: 0000000000000004 RSI: ffffffff819b88f8 RDI: 0000000000000020
RBP: ffff88805363f7d8 R08: ffffed1013009091 R09: ffff888098048400
R10: ffffed1013009090 R11: ffff888098048487 R12: ffffea0001663800
R13: ffffea0001663800 R14: 0000000000000000 R15: ffff88804e4cbb40
kobject: 'loop3' (ffff8880a4a7e9e0): fill_kobj_path: path = '/devices/virtual/block/loop3'
FS:  00007f12d8a0f700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd47f04fd0 CR3: 0000000096e78000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __blockdev_direct_IO+0xa1/0xca fs/direct-io.c:1422
 ext4_direct_IO_write fs/ext4/inode.c:3703 [inline]
 ext4_direct_IO+0x70d/0x1890 fs/ext4/inode.c:3833
 generic_file_direct_write+0x1e7/0x430 mm/filemap.c:2949
 __generic_file_write_iter+0x2bc/0x5b0 mm/filemap.c:3128
 ext4_file_write_iter+0x2ac/0xe90 fs/ext4/file.c:268
 call_write_iter include/linux/fs.h:1777 [inline]
 do_iter_readv_writev+0x418/0x670 fs/read_write.c:675
 do_iter_write fs/read_write.c:954 [inline]
 do_iter_write+0x154/0x540 fs/read_write.c:935
 vfs_iter_write+0x77/0xb0 fs/read_write.c:967
 iter_file_splice_write+0x572/0xad0 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 do_splice fs/splice.c:1147 [inline]
 SYSC_splice fs/splice.c:1402 [inline]
 SyS_splice+0xd92/0x1430 fs/splice.c:1382
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a29
RSP: 002b:00007f12d8a0ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459a29
RDX: 000000000000000a RSI: 0000000000000000 RDI: 0000000000000007
RBP: 000000000075bf20 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f12d8a0f6d4
R13: 00000000004c9234 R14: 00000000004df870 R15: 00000000ffffffff
Code: 92 99 d8 ff e9 4a 1d 00 00 e8 f8 59 c1 ff 48 8b 84 24 f0 00 00 00 48 8d 78 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3d 54 00 00 48 8b 84 24 f0 00 00 00 4c 8b 60 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff88805363f4c0
RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff88805363f4c0
RIP: get_page include/linux/mm.h:833 [inline] RSP: ffff88805363f4c0
RIP: submit_page_section fs/direct-io.c:890 [inline] RSP: ffff88805363f4c0
RIP: do_direct_IO fs/direct-io.c:1097 [inline] RSP: ffff88805363f4c0
RIP: do_blockdev_direct_IO+0x1c75/0x7fd0 fs/direct-io.c:1336 RSP: ffff88805363f4c0
kobject: 'loop4' (ffff8880a4ac6a60): kobject_uevent_env
---[ end trace c7e262927023dd59 ]---
kobject: 'loop4' (ffff8880a4ac6a60): fill_kobj_path: path = '/devices/virtual/block/loop4'