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=139da604d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8cb23303ddb9411f dashboard link: https://syzkaller.appspot.com/bug?extid=7bf7b22759195c9a21e9 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108c7e04d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1177c324d00000 Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11a6e7d2d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13a6e7d2d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=15a6e7d2d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7bf7b22759195c9a21e9@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================================ UBSAN: shift-out-of-bounds in net/ieee802154/nl802154.c:914:44 shift exponent -1627389953 is negative CPU: 0 PID: 8454 Comm: syz-executor539 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 nl802154_new_interface.cold+0x19/0x1e net/ieee802154/nl802154.c:914 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: 0033:0x43fa19 Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffda15b8b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fa19 RDX: 0000000000000000 RSI: 0000000020000ac0 RDI: 0000000000000003 RBP: 0000000000403480 R08: 0000000000000001 R09: 00000000004004a0 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000403510 R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0 ================================================================================ --- 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. 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
