On Fri, Jun 25, 2021 at 4:55 AM Pali Rohár <pali@xxxxxxxxxx> wrote: > > Hello! > > On Friday 25 June 2021 13:29:00 Koen Vandeputte wrote: > > ... > It is same race condition which I described in the first email of this > email thread. I described exactly when it happens. I'm not able to > trigger it with new kernels but as we know race conditions are hard to > trigger... > > So result is that we know about it, just fix is not ready yet as it is > not easy to fix it. > > Krzysztof has been working on fixing it, so maybe can provide an > update... I think we're seeing the same issue with a Linux VM on Hyper-V. Here the kernel is https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/bionic/tree/?h=Ubuntu-azure-5.4-5.4.0-1061.64_18.04.1 [ 4.680707] hv_pci 47505500-0003-0000-3130-444531334632: PCI VMBus probing: Using version 0x10002 [ 4.730457] hv_pci 47505500-0003-0000-3130-444531334632: PCI host bridge to bus 0003:00 [ 4.735577] pci_bus 0003:00: root bus resource [mem 0x43000000-0x43ffffff window] [ 4.742189] pci_bus 0003:00: root bus resource [mem 0x1020000000-0x1031ffffff window] [ 4.747027] pci 0003:00:00.0: [10de:13f2] type 00 class 0x030000 [ 4.770114] pci 0003:00:00.0: reg 0x10: [mem 0x43000000-0x43ffffff] [ 4.792153] pci 0003:00:00.0: reg 0x14: [mem 0x1020000000-0x102fffffff 64bit pref] [ 4.814022] pci 0003:00:00.0: reg 0x1c: [mem 0x1030000000-0x1031ffffff 64bit pref] [ 4.854830] pci 0003:00:00.0: Enabling HDA controller [ 4.869665] pci 0003:00:00.0: vgaarb: VGA device added: decodes=io+mem,owns=mem,locks=none [ 4.879399] pci 0003:00:00.0: BAR 1: assigned [mem 0x1020000000-0x102fffffff 64bit pref] [ 4.903880] pci 0003:00:00.0: BAR 3: assigned [mem 0x1030000000-0x1031ffffff 64bit pref] [ 4.927977] pci 0003:00:00.0: BAR 0: assigned [mem 0x43000000-0x43ffffff] [ 4.938162] sysfs: cannot create duplicate filename '/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/47505500-0003-0000-3130-444531334632/pci0003:00/0003:00:00.0/config' [ 4.951818] CPU: 0 PID: 135 Comm: kworker/0:2 Not tainted 5.4.0-1061-azure #64~18.04.1-Ubuntu [ 4.951820] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017 [ 4.955812] Workqueue: hv_pri_chan vmbus_add_channel_work [ 4.955812] Call Trace: [ 4.955812] dump_stack+0x57/0x6d [ 4.955812] sysfs_warn_dup+0x5b/0x70 [ 4.955812] sysfs_add_file_mode_ns+0x158/0x180 [ 4.955812] sysfs_create_bin_file+0x64/0x90 [ 4.955812] pci_create_sysfs_dev_files+0x72/0x270 [ 4.955812] pci_bus_add_device+0x30/0x80 [ 4.955812] pci_bus_add_devices+0x31/0x70 [ 4.955812] hv_pci_probe+0x48c/0x650 [ 4.955812] vmbus_probe+0x3e/0x90 [ 4.955812] really_probe+0xf5/0x440 [ 4.955812] driver_probe_device+0x11b/0x130 [ 4.955812] __device_attach_driver+0x7b/0xe0 [ 4.955812] ? driver_allows_async_probing+0x60/0x60 [ 4.955812] bus_for_each_drv+0x6e/0xb0 [ 4.955812] __device_attach+0xe4/0x160 [ 4.955812] device_initial_probe+0x13/0x20 [ 4.955812] bus_probe_device+0x92/0xa0 [ 4.955812] device_add+0x402/0x690 [ 4.955812] device_register+0x1a/0x20 [ 4.955812] vmbus_device_register+0x5e/0xf0 [ 4.955812] vmbus_add_channel_work+0x2c4/0x640 [ 4.955812] process_one_work+0x209/0x400 [ 4.955812] worker_thread+0x34/0x400 [ 4.955812] kthread+0x121/0x140 [ 4.955812] ? process_one_work+0x400/0x400 [ 4.955812] ? kthread_park+0x90/0x90 [ 4.955812] ret_from_fork+0x35/0x40 Thanks, Dexuan
