Hello, syzbot found the following issue on: HEAD commit: 3af409ca net: enetc: fix destroyed phylink dereference dur.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=11e8c05cd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8cb23303ddb9411f dashboard link: https://syzkaller.appspot.com/bug?extid=9b658439133becd38da1 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+9b658439133becd38da1@xxxxxxxxxxxxxxxxxxxxxxxxx RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffff04bfbdf R14: 00007f694f5fc300 R15: 0000000000022000 kobject_add_internal failed for 43:32 with -EEXIST, don't try to register things with the same name in the same directory. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 9626 at block/genhd.c:749 __device_add_disk+0xfdc/0x12b0 block/genhd.c:749 Modules linked in: CPU: 0 PID: 9626 Comm: syz-executor.4 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__device_add_disk+0xfdc/0x12b0 block/genhd.c:749 Code: f1 ff ff e8 46 e1 c3 fd 0f 0b e9 12 f7 ff ff 48 89 7c 24 20 e8 35 e1 c3 fd 0f 0b 48 8b 7c 24 20 e9 d6 f4 ff ff e8 24 e1 c3 fd <0f> 0b e9 f7 fb ff ff 4c 89 ef e8 c5 bb 06 fe e9 7d f1 ff ff 48 8b RSP: 0018:ffffc9000257f340 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc90011d9d000 RDX: 0000000000040000 RSI: ffffffff83aef37c RDI: 0000000000000003 RBP: ffff88801909c800 R08: 0000000000000000 R09: ffffffff8f8667f7 R10: ffffffff83aeef71 R11: 0000000000000000 R12: 00000000ffffffef R13: ffff88801909c858 R14: ffff88801a15aed0 R15: ffff888013cc8000 FS: 00007f694f5fc700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ba23aa08d7 CR3: 000000006d4b7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: add_disk include/linux/genhd.h:241 [inline] nbd_dev_add+0x6f3/0x8e0 drivers/block/nbd.c:1739 nbd_genl_connect+0x557/0x1560 drivers/block/nbd.c:1849 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 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: 0033:0x465ef9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f694f5fc188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000004 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffff04bfbdf R14: 00007f694f5fc300 R15: 0000000000022000 --- 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.
