kernel BUG at net/core/dev.c:NUM!

* kernel BUG at net/core/dev.c:NUM!
@ 2021-01-13 10:27 syzbot
  2021-01-13 19:41 ` Jakub Kicinski
  0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2021-01-13 10:27 UTC (permalink / raw)
  To: andrii, andriin, ast, bpf, daniel, davem, edumazet, f.fainelli,
	hawk, john.fastabend, kafai, kpsingh, kuba, linux-kernel, netdev,
	roopa, songliubraving, syzkaller-bugs, yhs

Hello,

syzbot found the following issue on:

HEAD commit:    c49243e8 Merge branch 'net-fix-issues-around-register_netd..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=11da7ba8d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bacfc914704718d3
dashboard link: https://syzkaller.appspot.com/bug?extid=2393580080a2da190f04
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13704c3f500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=160cc357500000

The issue was bisected to:

commit c269a24ce057abfc31130960e96ab197ef6ab196
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Wed Jan 6 18:40:06 2021 +0000

    net: make free_netdev() more lenient with unregistering devices

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13901b50d00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10501b50d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17901b50d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2393580080a2da190f04@syzkaller.appspotmail.com
Fixes: c269a24ce057 ("net: make free_netdev() more lenient with unregistering devices")

------------[ cut here ]------------
kernel BUG at net/core/dev.c:10661!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8459 Comm: syz-executor375 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:free_netdev+0x4b3/0x5e0 net/core/dev.c:10661
Code: c0 01 38 d0 7c 08 84 d2 0f 85 1a 01 00 00 0f b7 83 32 02 00 00 48 29 c3 48 89 df e8 d7 77 ac fa e9 47 ff ff ff e8 3d 1e 80 fa <0f> 0b e8 36 1e 80 fa 0f b6 2d 39 e1 e8 05 31 ff 89 ee e8 a6 24 80
RSP: 0018:ffffc9000163f1a0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802814a000 RCX: 0000000000000000
RDX: ffff888021678000 RSI: ffffffff86f25763 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86f25683 R11: 0000000000000003 R12: ffff888028149ef8
R13: ffff88802814a058 R14: dffffc0000000000 R15: ffff888028149ef8
FS:  00000000010bf880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ade220a6d8 CR3: 0000000012719000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __rtnl_newlink+0x1484/0x16e0 net/core/rtnetlink.c:3447
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4404b9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff3e934f98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404b9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000014 R09: 00000000004002c8
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401cc0
R13: 0000000000401d50 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace ec4d68ff94a95202 ]---
RIP: 0010:free_netdev+0x4b3/0x5e0 net/core/dev.c:10661
Code: c0 01 38 d0 7c 08 84 d2 0f 85 1a 01 00 00 0f b7 83 32 02 00 00 48 29 c3 48 89 df e8 d7 77 ac fa e9 47 ff ff ff e8 3d 1e 80 fa <0f> 0b e8 36 1e 80 fa 0f b6 2d 39 e1 e8 05 31 ff 89 ee e8 a6 24 80
RSP: 0018:ffffc9000163f1a0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802814a000 RCX: 0000000000000000
RDX: ffff888021678000 RSI: ffffffff86f25763 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff86f25683 R11: 0000000000000003 R12: ffff888028149ef8
R13: ffff88802814a058 R14: dffffc0000000000 R15: ffff888028149ef8
FS:  00000000010bf880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd33803e118 CR3: 0000000012719000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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