buffer_io_error: 120 callbacks suppressed
Buffer I/O error on dev loop0, logical block 0, lost async page write
blk_update_request: I/O error, dev loop0, sector 4
Buffer I/O error on dev loop0, logical block 1, lost async page write
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 16288 Comm: syz-executor7 Not tainted 4.4.151-ge917467 #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801bcb1b000 task.stack: ffff8801ba968000
RIP: 0010:[<ffffffff82f264ec>]  [<ffffffff82f264ec>] sockfs_setattr+0xbc/0x140 net/socket.c:531
RSP: 0018:ffff8801ba96fcb8  EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff8801ba96fde8 RCX: ffffc90004c45000
RDX: 0000000000000080 RSI: ffffffff82f2648e RDI: 0000000000000404
RBP: ffff8801ba96fcd0 R08: ffff8801bcb1b928 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8801d2c71b80 R15: 0000000000000000
FS:  00007f490827a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8adff31000 CR3: 00000001bdb9c000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801ba96fde8 ffffffff82f26430 0000000000001846 ffff8801ba96fd38
 ffffffff8157c85a ffff8801d2c71bd8 ffff8801ba96fda8 000000005b7d4fe1
 0000000033b1bbf0 ffff8801d991ca20 00000000c338c1ff ffff8801ba96fe68
Call Trace:
 [<ffffffff8157c85a>] notify_change2+0x96a/0xbd0 fs/attr.c:283
 [<ffffffff8151cd44>] chown_common+0x484/0x550 fs/open.c:612
 [<ffffffff81520415>] SYSC_fchownat fs/open.c:642 [inline]
 [<ffffffff81520415>] SyS_fchownat+0x115/0x1b0 fs/open.c:622
 [<ffffffff838cc125>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d f0 49 8d bd 04 04 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 47 
RIP  [<ffffffff82f264ec>] sockfs_setattr+0xbc/0x140 net/socket.c:531
 RSP <ffff8801ba96fcb8>
---[ end trace 5b2584b17f71b3e8 ]---