kasan: GPF could be caused by NULL-ptr deref or user memory access
audit: type=1804 audit(1541565770.308:64): pid=9428 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor1" name="/root/syzkaller-testdir917011104/syzkaller.aasC3v/92/file0" dev="sda1" ino=16731 res=1
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9398 Comm: syz-executor5 Not tainted 4.20.0-rc1-next-20181107+ #107
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567
Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40
RSP: 0018:ffff8801857b7880 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
RBP: ffff8801857b7a60 R08: ffff880185f84100 R09: ffffed003b5e5b67
R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801d7016a80
R13: ffff8801857b78f8 R14: 1ffff10030af6f13 R15: dffffc0000000000
FS:  0000000002006940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc68d418330 CR3: 00000001d8c62000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 locks_remove_file+0x148/0x5c0 fs/locks.c:2607
 __fput+0x2f0/0xa70 fs/file_table.c:271
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffcba59cdb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000732a20 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffcba59ccd0 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000057 R15: 0000000000000005
Modules linked in:
kobject: 'loop0' (000000006f175ca9): kobject_uevent_env
kobject: 'loop0' (000000006f175ca9): fill_kobj_path: path = '/devices/virtual/block/loop0'
---[ end trace 6f68deb546233fc0 ]---
RIP: 0010:locks_remove_flock+0x216/0x350 fs/locks.c:2567
Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40
RSP: 0018:ffff8801857b7880 EFLAGS: 00010202
kobject: 'loop1' (0000000027b2f3f8): kobject_uevent_env
RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: ffffffff81ed555d
RDX: 000000000836b157 RSI: ffffffff81ed5c71 RDI: 0000000041b58abb
kobject: 'loop1' (0000000027b2f3f8): fill_kobj_path: path = '/devices/virtual/block/loop1'
RBP: ffff8801857b7a60 R08: ffff880185f84100 R09: ffffed003b5e5b67
audit: type=1800 audit(1541565770.918:65): pid=9445 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor1" name="file0" dev="sda1" ino=16719 res=0
kobject: 'loop2' (00000000401ac671): kobject_uevent_env
audit: type=1804 audit(1541565770.918:66): pid=9445 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor1" name="/root/syzkaller-testdir917011104/syzkaller.aasC3v/93/file0" dev="sda1" ino=16719 res=1
kobject: 'loop2' (00000000401ac671): fill_kobj_path: path = '/devices/virtual/block/loop2'
R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801d7016a80
R13: ffff8801857b78f8 R14: 1ffff10030af6f13 R15: dffffc0000000000
FS:  0000000002006940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd9fb410000 CR3: 00000001d8c62000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400