Messages in this thread | | | Date | Thu, 24 Nov 2022 09:42:57 +0800 | Subject | Re: [syzbot] unregister_netdevice: waiting for DEV to become free (7) | From | wangyufen <> |
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在 2022/11/24 8:22, Jason Gunthorpe 写道: > On Wed, Nov 23, 2022 at 05:45:53PM +0800, Guoqing Jiang wrote: >> But it is the caller's responsibility to destroy it since commit >> dd37d2f59eb8. >> >>> The causes are as follows: >>> >>> rdma_listen() >>> rdma_bind_addr() >>> cma_acquire_dev_by_src_ip() >>> cma_attach_to_dev() >>> _cma_attach_to_dev() >>> cma_dev_get() >> >> Thanks for the analysis. >> >> And for the two callers of cma_listen_on_dev, looks they have >> different behaviors with regard to handling failure. > > Yes, the CM is not the problem, and that print from it is unrelated > Yes, I misanalyzed earlier.
> I patched in netdevice_tracker and get this: > > [ 237.475070][ T7541] unregister_netdevice: waiting for vlan0 to become free. Usage count = 2 > [ 237.477311][ T7541] leaked reference. > [ 237.478378][ T7541] ib_device_set_netdev+0x266/0x730 > [ 237.479848][ T7541] siw_newlink+0x4e0/0xfd0 > [ 237.481100][ T7541] nldev_newlink+0x35c/0x5c0 > [ 237.482121][ T7541] rdma_nl_rcv_msg+0x36d/0x690 > [ 237.483312][ T7541] rdma_nl_rcv+0x2ee/0x430 > [ 237.484483][ T7541] netlink_unicast+0x543/0x7f0 > [ 237.485746][ T7541] netlink_sendmsg+0x918/0xe20 > [ 237.486866][ T7541] sock_sendmsg+0xcf/0x120 > [ 237.488006][ T7541] ____sys_sendmsg+0x70d/0x8b0 > [ 237.489294][ T7541] ___sys_sendmsg+0x11d/0x1b0 > [ 237.490404][ T7541] __sys_sendmsg+0xfa/0x1d0 > [ 237.491451][ T7541] do_syscall_64+0x35/0xb0 > [ 237.492566][ T7541] entry_SYSCALL_64_after_hwframe+0x63/0xcd > > Which seems to confirm my original prediction, except this is siw not > rxe.. > Rxe dose not have this issue, maybe because it does not support vlan dev.
> Maybe rxe was the wrong guess, or maybe it is troubled too in other > reports?
> > Jason
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