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: 1 PID: 4488 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800b9afc800 task.stack: ffff8800b5d20000 RIP: 0010:[] [] sockfs_setattr+0xbc/0x140 net/socket.c:531 RSP: 0018:ffff8800b5d27cb8 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: ffff8800b5d27de8 RCX: 0000000000000000 RDX: 0000000000000080 RSI: ffffffff82f2648e RDI: 0000000000000404 RBP: ffff8800b5d27cd0 R08: ffffed0016ba4f5b R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8800adb75080 R15: 0000000000000000 FS: 00007fbb48d08700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200000c0 CR3: 00000000b2f49000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8800b5d27de8 ffffffff82f26430 0000000000001846 ffff8800b5d27d38 ffffffff8157c85a ffff8800adb750d8 ffff8800b5d27da8 000000005b7d63fd 0000000014fec568 ffff8801d991ca20 000000003ed4c1ff ffff8800b5d27e68 Call Trace: [] notify_change2+0x96a/0xbd0 fs/attr.c:283 [] chown_common+0x484/0x550 fs/open.c:612 [] SYSC_fchownat fs/open.c:642 [inline] [] SyS_fchownat+0x115/0x1b0 fs/open.c:622 [] 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 [] sockfs_setattr+0xbc/0x140 net/socket.c:531 RSP ---[ end trace 836adc096583020f ]---