Hello, syzbot found the following issue on: HEAD commit: 819d11507f66 bpf, selftests: Fix spelling mistake "tained".. git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=12500db3b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=22b66456935ee10 dashboard link: https://syzkaller.appspot.com/bug?extid=983941aa85af6ded1fd9 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153a6cb3b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=121c690bb00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+983941aa85af6ded1fd9@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc000000003e: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001f0-0x00000000000001f7] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dev_index_hash net/core/dev.c:222 [inline] RIP: 0010:dev_get_by_index_rcu+0x28/0x140 net/core/dev.c:885 Code: 00 00 41 55 41 54 55 89 f5 53 48 89 fb e8 00 9d 4d fa 48 8d bb f0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fc 00 00 00 48 8b 93 f0 01 00 00 40 0f b6 c5 48 RSP: 0018:ffffc90000d97608 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 000000000000003e RSI: ffffffff872a14d0 RDI: 00000000000001f0 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff873745ad R11: 000000000008808a R12: ffff88806a062100 R13: 0000000000000003 R14: ffff88806a062100 R15: ffffc90001116000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555733a848 CR3: 000000001479e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ____bpf_clone_redirect net/core/filter.c:2410 [inline] bpf_clone_redirect+0x91/0x420 net/core/filter.c:2401 bpf_prog_bebbfe2050753572+0x56/0xcc0 __bpf_prog_run include/linux/filter.h:626 [inline] bpf_prog_run_xdp include/linux/filter.h:801 [inline] veth_xdp_rcv_skb+0x64b/0x1b20 drivers/net/veth.c:775 veth_xdp_rcv+0x3ac/0x810 drivers/net/veth.c:881 veth_poll+0x134/0x850 drivers/net/veth.c:913 __napi_poll+0xaf/0x440 net/core/dev.c:7023 napi_poll net/core/dev.c:7090 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7177 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Modules linked in: ---[ end trace 86b7d5782a67ad32 ]--- RIP: 0010:dev_index_hash net/core/dev.c:222 [inline] RIP: 0010:dev_get_by_index_rcu+0x28/0x140 net/core/dev.c:885 Code: 00 00 41 55 41 54 55 89 f5 53 48 89 fb e8 00 9d 4d fa 48 8d bb f0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fc 00 00 00 48 8b 93 f0 01 00 00 40 0f b6 c5 48 RSP: 0018:ffffc90000d97608 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 000000000000003e RSI: ffffffff872a14d0 RDI: 00000000000001f0 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff873745ad R11: 000000000008808a R12: ffff88806a062100 R13: 0000000000000003 R14: ffff88806a062100 R15: ffffc90001116000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555733a848 CR3: 000000001479e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 41 55 push %r13 4: 41 54 push %r12 6: 55 push %rbp 7: 89 f5 mov %esi,%ebp 9: 53 push %rbx a: 48 89 fb mov %rdi,%rbx d: e8 00 9d 4d fa callq 0xfa4d9d12 12: 48 8d bb f0 01 00 00 lea 0x1f0(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 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 fc 00 00 00 jne 0x130 34: 48 8b 93 f0 01 00 00 mov 0x1f0(%rbx),%rdx 3b: 40 0f b6 c5 movzbl %bpl,%eax 3f: 48 rex.W --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
