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Message-ID: <000000000000333b8205ea1cb208@google.com> Date: Mon, 03 Oct 2022 00:57:33 -0700 From: syzbot <syzbot+8bc17b3c5f031a4f9c7a@...kaller.appspotmail.com> To: bigeasy@...utronix.de, bpoirier@...dia.com, davem@...emloft.net, edumazet@...gle.com, gongruiqi1@...wei.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, victor.erminpour@...cle.com Subject: [syzbot] general protection fault in mpls_dev_notify Hello, syzbot found the following issue on: HEAD commit: 87dbdc230d16 libbpf: Don't require full struct enum64 in U.. git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=12b84b40880000 kernel config: https://syzkaller.appspot.com/x/.config?x=42e1b6f9cf3a9e87 dashboard link: https://syzkaller.appspot.com/bug?extid=8bc17b3c5f031a4f9c7a compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8bc17b3c5f031a4f9c7a@...kaller.appspotmail.com bond0 (unregistering): (slave bond_slave_1): Releasing backup interface bond0 (unregistering): (slave bond_slave_0): Releasing backup interface bond0 (unregistering): Released all slaves general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 PID: 1188 Comm: kworker/u4:5 Not tainted 6.0.0-rc3-syzkaller-00907-g87dbdc230d16 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: netns cleanup_net RIP: 0010:mpls_dev_sysctl_unregister net/mpls/af_mpls.c:1440 [inline] RIP: 0010:mpls_dev_notify+0x5b1/0x9b0 net/mpls/af_mpls.c:1653 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d2 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 18 48 8d 7d 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e4 03 00 00 4c 8b 75 20 48 89 ef e8 d9 8f dd ff RSP: 0018:ffffc900053ef988 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888025615480 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff892de450 RDI: 0000000000000020 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888021f38378 R13: ffff88804c6b0000 R14: 0000000000000000 R15: ffff888021f38000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24d03faa70 CR3: 0000000075674000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] unregister_netdevice_many+0xa62/0x1980 net/core/dev.c:10860 default_device_exit_batch+0x449/0x590 net/core/dev.c:11354 ops_exit_list+0x125/0x170 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mpls_dev_sysctl_unregister net/mpls/af_mpls.c:1440 [inline] RIP: 0010:mpls_dev_notify+0x5b1/0x9b0 net/mpls/af_mpls.c:1653 Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d2 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 18 48 8d 7d 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e4 03 00 00 4c 8b 75 20 48 89 ef e8 d9 8f dd ff RSP: 0018:ffffc900053ef988 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888025615480 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff892de450 RDI: 0000000000000020 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888021f38378 R13: ffff88804c6b0000 R14: 0000000000000000 R15: ffff888021f38000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005587a8b96950 CR3: 00000000257b2000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 89 fa mov %rdi,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 0f 85 d2 03 00 00 jne 0x3e3 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 48 8b 6b 18 mov 0x18(%rbx),%rbp 1f: 48 8d 7d 20 lea 0x20(%rbp),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 e4 03 00 00 jne 0x418 34: 4c 8b 75 20 mov 0x20(%rbp),%r14 38: 48 89 ef mov %rbp,%rdi 3b: e8 d9 8f dd ff callq 0xffdd9019 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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