On Mon, Jan 22, 2018 at 11:58 AM, syzbot <syzbot+1c788d7ce0f0888f1...@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot hit the following crash on net-next commit > ebdd7b491b8a65d65936e07004caabca4a3c94a0 (Sun Jan 21 23:21:31 2018 +0000) > Merge branch 'mlxsw-Add-support-for-mirror-action-with-flower' > > So far this crash happened 52 times on net-next. > C reproducer is attached. > syzkaller reproducer is attached. > Raw console output is attached. > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+1c788d7ce0f0888f1...@syzkaller.appspotmail.com > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > ------------[ cut here ]------------ > Driver BUG > WARNING: CPU: 1 PID: 3661 at net/core/xdp.c:22 xdp_rxq_info_unreg+0xc1/0xf0 > net/core/xdp.c:22 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 1 PID: 3661 Comm: syzkaller881172 Not tainted 4.15.0-rc8+ #202 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:53 > panic+0x1e4/0x41c kernel/panic.c:183 > __warn+0x1dc/0x200 kernel/panic.c:547 > report_bug+0x211/0x2d0 lib/bug.c:184 > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 > fixup_bug arch/x86/kernel/traps.c:247 [inline] > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 > invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1096 > RIP: 0010:xdp_rxq_info_unreg+0xc1/0xf0 net/core/xdp.c:22 > RSP: 0018:ffff8801bc62ee78 EFLAGS: 00010282 > RAX: dffffc0000000008 RBX: ffff8801d950b1c0 RCX: ffffffff8159f28e > RDX: 0000000000000000 RSI: 1ffff100378c5d8a RDI: 0000000000000293 > RBP: ffff8801bc62ee90 R08: 1ffff100378c5d4c R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d950b1cc > R13: 0000000000000002 R14: 00000000000003e8 R15: 0000000000000000 > tun_cleanup_tx_ring.part.47+0x236/0x450 drivers/net/tun.c:686 > tun_cleanup_tx_ring drivers/net/tun.c:684 [inline] > tun_detach_all+0x4fd/0xbf0 drivers/net/tun.c:779
This is caused by the merge conflict, I will send a fix. > tun_net_uninit+0x15/0x20 drivers/net/tun.c:1003 > rollback_registered_many+0x9a8/0xe20 net/core/dev.c:7360 > unregister_netdevice_many.part.118+0x87/0x420 net/core/dev.c:8421 > unregister_netdevice_many+0xbb/0x100 net/core/dev.c:8420 > rtnl_delete_link+0x10f/0x170 net/core/rtnetlink.c:2586 > rtnl_dellink+0x2d5/0x7e0 net/core/rtnetlink.c:2625 > rtnetlink_rcv_msg+0x57f/0xb10 net/core/rtnetlink.c:4530 > netlink_rcv_skb+0x14b/0x380 net/netlink/af_netlink.c:2442 > rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4548 > netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline] > netlink_unicast+0x4c4/0x6b0 net/netlink/af_netlink.c:1334 > netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1897 > sock_sendmsg_nosec net/socket.c:630 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:640 > ___sys_sendmsg+0x767/0x8b0 net/socket.c:2020 > __sys_sendmsg+0xe5/0x210 net/socket.c:2054 > SYSC_sendmsg net/socket.c:2065 [inline] > SyS_sendmsg+0x2d/0x50 net/socket.c:2061 > entry_SYSCALL_64_fastpath+0x29/0xa0 > RIP: 0033:0x445189 > RSP: 002b:00007fff8d14a8c8 EFLAGS: 00000207 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00000000004a6a32 RCX: 0000000000445189 > RDX: 0000000020000040 RSI: 000000002001bfc8 RDI: 0000000000000004 > RBP: 00007fff8d14a9d8 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000207 R12: 00007fff8d14a9d8 > R13: 0000000000402650 R14: 0000000000000000 R15: 0000000000000000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkal...@googlegroups.com. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body.
