netdev - WARNING in hsr_dev

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Message-ID: <000000000000a5de6405a8ffe8f2@google.com>
Date:   Fri, 26 Jun 2020 10:19:16 -0700
From:   syzbot <syzbot+7f1c020f68dab95aab59@...kaller.appspotmail.com>
To:     ap420073@...il.com, davem@...emloft.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com
Subject: WARNING in hsr_dev_finalize

Hello,

syzbot found the following crash on:

HEAD commit:    4a21185c Merge git://git.kernel.org/pub/scm/linux/kernel/g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14458775100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bf3aec367b9ab569
dashboard link: https://syzkaller.appspot.com/bug?extid=7f1c020f68dab95aab59
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17bbeb75100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1587d955100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7f1c020f68dab95aab59@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 7036 at net/core/dev.c:8992 rollback_registered_many+0xbdb/0xf60 net/core/dev.c:8992
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 7036 Comm: syz-executor966 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 exc_invalid_op+0x24d/0x400 arch/x86/kernel/traps.c:235
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:rollback_registered_many+0xbdb/0xf60 net/core/dev.c:8992
Code: 00 00 31 f6 4c 89 f7 e8 f3 d9 fc ff e9 4f fe ff ff 4c 89 e7 e9 48 fd ff ff e8 31 65 3e fb 0f 0b e9 da fd ff ff e8 25 65 3e fb <0f> 0b e9 18 fe ff ff e8 19 65 3e fb 0f b6 2d de 64 74 04 31 ff 89
RSP: 0018:ffffc90001f5ef60 EFLAGS: 00010293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8634e915
RDX: ffff8880949f0000 RSI: ffffffff8634eb2b RDI: 0000000000000005
RBP: ffff888094a6e0b8 R08: 0000000000000000 R09: ffffffff8a7b01c7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a693ea00
R13: 0000000000034960 R14: ffff888094a6e000 R15: 0000000000000000
 rollback_registered net/core/dev.c:9013 [inline]
 unregister_netdevice_queue+0x2dd/0x570 net/core/dev.c:10094
 unregister_netdevice include/linux/netdevice.h:2754 [inline]
 hsr_dev_finalize+0x5ce/0x746 net/hsr/hsr_device.c:483
 hsr_newlink+0x27c/0x520 net/hsr/hsr_netlink.c:83
 __rtnl_newlink+0x1090/0x1730 net/core/rtnetlink.c:3339
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3397
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5460
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443ee9
Code: Bad RIP value.
RSP: 002b:00007ffe34db5118 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443ee9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007ffe34db5120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000fdfc
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled


---
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