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: 1 PID: 20466 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d7be0000 task.stack: ffff8801c7f80000 RIP: 0010:[] [] sockfs_setattr+0xbc/0x140 net/socket.c:544 RSP: 0018:ffff8801c7f87c48 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff8801c7f87d90 RCX: 0000000000000000 RDX: 0000000000000065 RSI: ffffffff8301ce8e RDI: 0000000000000328 RBP: ffff8801c7f87c60 R08: ffffed0038ff0f4d R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801bd26dce0 R15: 0000000000000000 FS: 00007f336194d700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200000c0 CR3: 00000001c7d52000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000001846 ffffffff8301ce30 ffff8801c7f87d90 ffff8801c7f87ce0 ffffffff815d8630 ffff8801cbe67bb0 ffff8801c7f87cb8 ffff8801bd26dd38 ffff8801c7f87d50 0000000000000004 0000000019bc0b10 ffff8801d9922e20 Call Trace: [] notify_change2+0xac0/0xdf0 fs/attr.c:313 [] chown_common+0x482/0x550 fs/open.c:629 [] SYSC_fchownat fs/open.c:659 [inline] [] SyS_fchownat+0x115/0x1b0 fs/open.c:639 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 87 00 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6d f0 49 8d bd 28 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 47 48 8d 7b 08 48 b8 00 00 00 RIP [] sockfs_setattr+0xbc/0x140 net/socket.c:544 RSP ---[ end trace d79a0fdb2125f20d ]---