netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access xt_CT: No such timeout policy "syz1" general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 25704 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 RIP: 0010:flush_gro_hash net/core/dev.c:6241 [inline] RIP: 0010:netif_napi_del+0x1d1/0x380 net/core/dev.c:6256 Code: 00 00 00 00 00 fc ff df e8 fc 8d ec fa 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 33 01 00 00 49 8b 2c 24 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 10 01 00 00 49 39 ec 48 8b 5d 00 75 05 eb 2d RSP: 0018:ffff888046b67658 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88804e2f0060 RCX: ffffffff8670b76b RDX: 0000000000000000 RSI: ffffffff8675f774 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88804e2eff58 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88804e2eff18 FS: 00007f0f56bc9700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffef CR3: 0000000046a36000 CR4: 00000000003426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: free_netdev+0x21f/0x410 net/core/dev.c:9250 netdev_run_todo+0x89b/0xab0 net/core/dev.c:9002 rtnl_unlock net/core/rtnetlink.c:117 [inline] rtnetlink_rcv_msg+0x460/0xb80 net/core/rtnetlink.c:4783 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0f58254109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0f56bc9168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0f58366f60 RCX: 00007f0f58254109 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00007f0f582ae05d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1fb1d4df R14: 00007f0f56bc9300 R15: 0000000000022000 Modules linked in: ---[ end trace 8e058c86340e8494 ]--- RIP: 0010:flush_gro_hash net/core/dev.c:6241 [inline] RIP: 0010:netif_napi_del+0x1d1/0x380 net/core/dev.c:6256 Code: 00 00 00 00 00 fc ff df e8 fc 8d ec fa 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 33 01 00 00 49 8b 2c 24 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 10 01 00 00 49 39 ec 48 8b 5d 00 75 05 eb 2d RSP: 0018:ffff888046b67658 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88804e2f0060 RCX: ffffffff8670b76b xt_CT: No such timeout policy "syz1" RDX: 0000000000000000 RSI: ffffffff8675f774 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88804e2eff58 xt_CT: No such timeout policy "syz1" R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88804e2eff18 FS: 00007f0f56bc9700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7c34552090 CR3: 0000000046a36000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 fc add %bh,%ah 6: ff (bad) 7: df e8 fucomip %st(0),%st 9: fc cld a: 8d (bad) b: ec in (%dx),%al c: fa cli d: 4c 89 e0 mov %r12,%rax 10: 48 c1 e8 03 shr $0x3,%rax 14: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 19: 0f 85 33 01 00 00 jne 0x152 1f: 49 8b 2c 24 mov (%r12),%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 0f 85 10 01 00 00 jne 0x145 35: 49 39 ec cmp %rbp,%r12 38: 48 8b 5d 00 mov 0x0(%rbp),%rbx 3c: 75 05 jne 0x43 3e: eb 2d jmp 0x6d