On Tue, Aug 26, 2025 at 12:57:50PM +0200, Marek Marczykowski-Górecki wrote: > On Tue, Aug 26, 2025 at 10:28:56AM +0200, Roger Pau Monné wrote: > > On Tue, Aug 26, 2025 at 08:16:56AM +0200, Jan Beulich wrote: > > > On 26.08.2025 03:49, Marek Marczykowski-Górecki wrote: > > > > Hi, > > > > > > > > I'm hitting an MSI-X issue after rebooting the domU. The symptoms are > > > > rather boring: on initial domU start the device (realtek eth card) works > > > > fine, but after domU restart, the link doesn't come up (there is no > > > > "Link is Up" message anymore). No errors from domU driver or Xen. I > > > > tracked it down to MSI-X - if I force INTx (via pci=nomsi on domU > > > > cmdline) it works fine. Convincing the driver to poll instead of waiting > > > > for an interrupt also workarounds the issue. > > > > > > > > I noticed also some interrupts are not cleaned up on restart. The list > > > > of MSIs in 'Q' debug key output grows: > > > > > > > > (XEN) 0000:03:00.0 - d22 - node -1 - MSIs < 41 42 43 44 45 46 47 > > > > > restart sys-net domU > > > > (XEN) 0000:03:00.0 - d24 - node -1 - MSIs < 41 42 43 44 45 46 47 > > > > 48 > > > > > restart sys-net domU > > > > (XEN) 0000:03:00.0 - d26 - node -1 - MSIs < 41 42 43 44 45 46 47 > > > > 48 49 > > > > > > > > > and 'M' output is: > > > > > > > > (XEN) MSI-X 41 vec=b1 lowest edge assert log lowest > > > > dest=00000001 mask=1/H /1 > > > > (XEN) MSI-X 42 vec=b9 lowest edge assert log lowest > > > > dest=00000004 mask=1/HG/1 > > > > (XEN) MSI-X 43 vec=c1 lowest edge assert log lowest > > > > dest=00000010 mask=1/HG/1 > > > > (XEN) MSI-X 44 vec=d9 lowest edge assert log lowest > > > > dest=00000001 mask=1/HG/1 > > > > (XEN) MSI-X 45 vec=e1 lowest edge assert log lowest > > > > dest=00000001 mask=1/HG/1 > > > > (XEN) MSI-X 46 vec=e9 lowest edge assert log lowest > > > > dest=00000040 mask=1/HG/1 > > > > (XEN) MSI-X 47 vec=32 lowest edge assert log lowest > > > > dest=00000004 mask=1/HG/1 > > > > (XEN) MSI-X 48 vec=3a lowest edge assert log lowest > > > > dest=00000040 mask=1/HG/1 > > > > (XEN) MSI-X 49 vec=42 lowest edge assert log lowest > > > > dest=00000010 mask=1/ G/1 > > > > > > > > And also, after starting and stopping the domU, `xl > > > > pci-assignable-remove 03:00.0` > > > > makes pciback to complain: > > > > > > > > [ 1180.919874] pciback 0000:03:00.0: xen_pciback: MSI-X release > > > > failed (-16) > > > > > > > > This is all running on Xen 4.19.3, but I don't see much changes in this > > > > area since then. > > > > > > > > Some more info collected at > > > > https://github.com/QubesOS/qubes-issues/issues/9335 > > > > > > > > My question is: what should be responsible for this cleanup on domain > > > > destroy? Xen, or maybe device model (which is QEMU in stubdomain here)? > > > > > > The expectation is that qemu invokes the necessary cleanup, but of course > > > ... > > > > > > > I see some cleanup (apparently not enough) happening via QEMU when the > > > > domU driver is unloaded, but logically correct cleanup shouldn't depend > > > > on correct domU operation... > > > > > > ... Xen may not make itself dependent upon either DomU or QEMU. > > > > AFAICT free_domain_pirqs() called by arch_domain_destroy() should take > > care of unbinding and freeing pirqs (but obviously not in this case). > > Can you repeat the test with a debug=y hypervisor and post the > > resulting serial or dmesg here? Some of the errors on those paths are > > printed with dprintk() and won't be visible unless using a Xen debug > > build. > > Sure, will do.
Output collected during domU shutdown and subsequent startup (dom0 logs to Xen console here too): https://gist.github.com/marmarek/6dc3ac14d3ba840482e6361fcbd37c30 I don't see any errors there... As for the domU-triggered cleanup, I just checked - if I unload the driver in domU before restarting, it works fine on subsequent startup. Relevant QEMU/stubdomain log parts (initial startup + shutdown, when device still works): 1. Without unloading the driver: [2025-08-26 12:57:42] [00:06.0] xen_pt_realize: Assigning real physical device 03:00.0 to devfn 0x30 [2025-08-26 12:57:42] [00:06.0] xen_pt_register_regions: IO region 0 registered (size=0x00000100 base_addr=0x0000e000 type: 0x1) [2025-08-26 12:57:42] [00:06.0] xen_pt_register_regions: IO region 2 registered (size=0x00001000 base_addr=0xf7c00000 type: 0x4) [2025-08-26 12:57:42] [00:06.0] xen_pt_register_regions: IO region 4 registered (size=0x00004000 base_addr=0xf0000000 type: 0x4) [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0010 mismatch! Emulated=0x0000, host=0xe001, syncing to 0xe001. [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0018 mismatch! Emulated=0x0000, host=0xf7c00004, syncing to 0xf7c00004. [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0020 mismatch! Emulated=0x0000, host=0xf000000c, syncing to 0xf000000c. [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0042 mismatch! Emulated=0x0000, host=0x07c3, syncing to 0x0603. [2025-08-26 12:57:42] [00:06.0] xen_pt_pm_ctrl_reg_init_on: PCI power management control passthrough is on [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0052 mismatch! Emulated=0x0000, host=0x0080, syncing to 0x0080. [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0074 mismatch! Emulated=0x0000, host=0x5908cc0, syncing to 0x5908cc0. [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x007a mismatch! Emulated=0x0000, host=0x0010, syncing to 0x0010. [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x0082 mismatch! Emulated=0x0000, host=0x1011, syncing to 0x1011. [2025-08-26 12:57:42] [00:06.0] xen_pt_msix_init: get MSI-X table BAR base 0xf0000000 [2025-08-26 12:57:42] [00:06.0] xen_pt_config_reg_init: Offset 0x00b2 mismatch! Emulated=0x0000, host=0x0003, syncing to 0x0003. [2025-08-26 12:57:42] [00:06.0] xen_pt_pci_intx: intx=1 [2025-08-26 12:57:42] [00:06.0] xen_pt_realize: Real physical device 03:00.0 registered successfully [2025-08-26 12:57:42] from-unix: {"return": {}, "id": 2020372736} [2025-08-26 12:57:42] [2025-08-26 12:57:42] wrote 34 bytes to vchan [2025-08-26 12:57:42] from-vchan: {"execute":"query-pci","id":2020372738} [2025-08-26 12:57:42] [2025-08-26 12:57:42] from-unix: {"return": [{"bus": 0, "devices": [{"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 0, "class_info": {"class": 1536, "desc": "Host bridge"}, "id": {"device": 4663, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 0, "regions": []}, {"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 1, "class_info": {"class": 1537, "desc": "ISA bridge"}, "id": {"device": 28672, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 0, "regions": []}, {"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 1, "class_info": {"class": 257, "desc": "IDE controller"}, "id": {"device": 28688, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 1, "regions": [{"bar": 4, "size": 16, "address": -1, "type": "io"}]}, {"irq_pin": 1, "bus": 0, "qdev_id": "", "irq": 0, "slot": 1, "class_info": {"class": 1664, "desc": "Bridge"}, "id": {"device": 28947, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 3, "regions": []}, {"irq_pin": 1, "bus": 0, "qdev_id": "", "irq": 0, "slot": 2, "class_info": {"class": 65408}, "id": {"device": 1, "subsystem-vendor": 22611, "vendor": 22611, "subsystem": 1}, "function": 0, "regions": [{"bar": 0, "size": 256, "address": -1, "type": "io"}, {"prefetch": true, "mem_type_64": false, "bar": 1, "size": 16777216, "address": -1, "type": "memory"}]}, {"irq_pin": 1, "bus": 0, "qdev_id": "", "irq": 0, "slot": 3, "class_info": {"class": 256, "desc": "SCSI controller"}, "id": {"device": 18, "subsystem-vendor": 0, "vendor": 4096, "subsystem": 4096}, "function": 0, "regions": [{"bar": 0, "size": 256, "address": -1, "type": "io"}, {"prefetch": false, "mem_type_64": false, "bar": 1, "size": 1024, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": false, "bar": 2, "size": 8192, "address": -1, "type": "memory"}]}, {"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 4, "class_info": {"class": 768, "desc": "VGA controller"}, "id": {"device": 4369, "subsystem-vendor": 6900, "vendor": 4660, "subsystem": 4352}, "function": 0, "regions": [{"prefetch": true, "mem_type_64": false, "bar": 0, "size": 16777216, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": false, "bar": 2, "size": 4096, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": false, "bar": 6, "size": 65536, "address": -1, "type": "memory"}]}, {"irq_pin": 4, "bus": 0, "qdev_id": "ehci", "irq": 0, "slot": 5, "class_info": {"class": 3075, "desc": "USB controller"}, "id": {"device": 9421, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 0, "regions": [{"prefetch": false, "mem_type_64": false, "bar": 0, "size": 4096, "address": -1, "type": "memory"}]}, {"irq_pin": 1, "bus": 0, "qdev_id": "pci-pt-03_00.0", "irq": 0, "slot": 6, "class_info": {"class": 0}, "id": {"device": 33128, "subsystem-vendor": 0, "vendor": 4332, "subsystem": 0}, "function": 0, "regions": [{"bar": 0, "size": 256, "address": -1, "type": "io"}, {"prefetch": false, "mem_type_64": true, "bar": 2, "size": 4096, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": true, "bar": 4, "size": 16384, "address": -1, "type": "memory"}]}]}], "id": 2020372738} [2025-08-26 12:57:42] [2025-08-26 12:57:42] wrote 2048 bytes to vchan [2025-08-26 12:57:42] wrote 1125 bytes to vchan [2025-08-26 12:57:42] vchan client disconnected [2025-08-26 12:57:42] [00:06.0] xen_pt_check_bar_overlap: Warning: Overlapped to device [00:02.0] Region: 1 (addr: 0xf0000000, len: 0x1000000) [2025-08-26 12:57:42] [00:06.0] xen_pt_region_update: Warning: Region: 4 (addr: 0xf0001000, len: 0x3000) is overlapped. [2025-08-26 12:57:44] {"timestamp": {"seconds": 1756213064, "microseconds": 412107}, "event": "DEVICE_DELETED", "data": {"path": "/machine/unattached/device[8]"}} [2025-08-26 12:57:44] {"timestamp": {"seconds": 1756213064, "microseconds": 416176}, "event": "DEVICE_DELETED", "data": {"path": "/machine/unattached/device[7]"}} [2025-08-26 12:57:44] {"timestamp": {"seconds": 1756213064, "microseconds": 416244}, "event": "DEVICE_DELETED", "data": {"path": "/machine/unattached/device[6]"}} [2025-08-26 12:57:44] {"timestamp": {"seconds": 1756213064, "microseconds": 416653}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral-anon/device[3]"}} [2025-08-26 12:57:44] {"timestamp": {"seconds": 1756213064, "microseconds": 416694}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral-anon/device[0]"}} [2025-08-26 12:57:48] [00:06.0] xen_pt_msixctrl_reg_write: enable MSI-X [2025-08-26 12:57:48] [00:06.0] msi_msix_update: Updating MSI-X with pirq 55 gvec 0xef gflags 0x0 (entry: 0x0) [2025-08-26 12:57:49] [00:06.0] msi_msix_update: Updating MSI-X with pirq 55 gvec 0x23 gflags 0x0 (entry: 0x0) [2025-08-26 13:21:03] {"timestamp": {"seconds": 1756214457, "microseconds": 588341}, "event": "SHUTDOWN", "data": {"guest": true, "reason": "guest-shutdown"}} [2025-08-26 13:21:03] {"timestamp": {"seconds": 1756214457, "microseconds": 588579}, "event": "STOP"} [2025-08-26 13:21:03] pcifront pci-0: Rescanning PCI Frontend Bus 0000:00 [2025-08-26 13:21:03] pci_bus 0000:00: busn_res: [bus 00-ff] is released [2025-08-26 13:21:03] ------------[ cut here ]------------ [2025-08-26 13:21:03] sysfs group 'power' not found for kobject '0000:00' [2025-08-26 13:21:03] WARNING: CPU: 0 PID: 13 at fs/sysfs/group.c:282 sysfs_remove_group+0x3a/0x6f 2. With unloading the driver before shutdown: [2025-08-26 13:21:07] [00:06.0] xen_pt_realize: Assigning real physical device 03:00.0 to devfn 0x30 [2025-08-26 13:21:07] [00:06.0] xen_pt_register_regions: IO region 0 registered (size=0x00000100 base_addr=0x0000e000 type: 0x1) [2025-08-26 13:21:07] [00:06.0] xen_pt_register_regions: IO region 2 registered (size=0x00001000 base_addr=0xf7c00000 type: 0x4) [2025-08-26 13:21:07] [00:06.0] xen_pt_register_regions: IO region 4 registered (size=0x00004000 base_addr=0xf0000000 type: 0x4) [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0010 mismatch! Emulated=0x0000, host=0xe001, syncing to 0xe001. [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0018 mismatch! Emulated=0x0000, host=0xf7c00004, syncing to 0xf7c00004. [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0020 mismatch! Emulated=0x0000, host=0xf000000c, syncing to 0xf000000c. [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0042 mismatch! Emulated=0x0000, host=0x07c3, syncing to 0x0603. [2025-08-26 13:21:07] [00:06.0] xen_pt_pm_ctrl_reg_init_on: PCI power management control passthrough is on [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0052 mismatch! Emulated=0x0000, host=0x0080, syncing to 0x0080. [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0074 mismatch! Emulated=0x0000, host=0x5908cc0, syncing to 0x5908cc0. [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x007a mismatch! Emulated=0x0000, host=0x0010, syncing to 0x0010. [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x0082 mismatch! Emulated=0x0000, host=0x1011, syncing to 0x1011. [2025-08-26 13:21:07] [00:06.0] xen_pt_msix_init: get MSI-X table BAR base 0xf0000000 [2025-08-26 13:21:07] [00:06.0] xen_pt_config_reg_init: Offset 0x00b2 mismatch! Emulated=0x0000, host=0x0003, syncing to 0x0003. [2025-08-26 13:21:07] [00:06.0] xen_pt_pci_intx: intx=1 [2025-08-26 13:21:07] [00:06.0] xen_pt_realize: Real physical device 03:00.0 registered successfully [2025-08-26 13:21:07] from-unix: {"return": {}, "id": 2020372736} [2025-08-26 13:21:07] [2025-08-26 13:21:07] wrote 34 bytes to vchan [2025-08-26 13:21:07] from-vchan: {"execute":"query-pci","id":2020372738} [2025-08-26 13:21:07] [2025-08-26 13:21:07] from-unix: {"return": [{"bus": 0, "devices": [{"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 0, "class_info": {"class": 1536, "desc": "Host bridge"}, "id": {"device": 4663, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 0, "regions": []}, {"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 1, "class_info": {"class": 1537, "desc": "ISA bridge"}, "id": {"device": 28672, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 0, "regions": []}, {"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 1, "class_info": {"class": 257, "desc": "IDE controller"}, "id": {"device": 28688, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 1, "regions": [{"bar": 4, "size": 16, "address": -1, "type": "io"}]}, {"irq_pin": 1, "bus": 0, "qdev_id": "", "irq": 0, "slot": 1, "class_info": {"class": 1664, "desc": "Bridge"}, "id": {"device": 28947, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 3, "regions": []}, {"irq_pin": 1, "bus": 0, "qdev_id": "", "irq": 0, "slot": 2, "class_info": {"class": 65408}, "id": {"device": 1, "subsystem-vendor": 22611, "vendor": 22611, "subsystem": 1}, "function": 0, "regions": [{"bar": 0, "size": 256, "address": -1, "type": "io"}, {"prefetch": true, "mem_type_64": false, "bar": 1, "size": 16777216, "address": -1, "type": "memory"}]}, {"irq_pin": 1, "bus": 0, "qdev_id": "", "irq": 0, "slot": 3, "class_info": {"class": 256, "desc": "SCSI controller"}, "id": {"device": 18, "subsystem-vendor": 0, "vendor": 4096, "subsystem": 4096}, "function": 0, "regions": [{"bar": 0, "size": 256, "address": -1, "type": "io"}, {"prefetch": false, "mem_type_64": false, "bar": 1, "size": 1024, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": false, "bar": 2, "size": 8192, "address": -1, "type": "memory"}]}, {"irq_pin": 0, "bus": 0, "qdev_id": "", "slot": 4, "class_info": {"class": 768, "desc": "VGA controller"}, "id": {"device": 4369, "subsystem-vendor": 6900, "vendor": 4660, "subsystem": 4352}, "function": 0, "regions": [{"prefetch": true, "mem_type_64": false, "bar": 0, "size": 16777216, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": false, "bar": 2, "size": 4096, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": false, "bar": 6, "size": 65536, "address": -1, "type": "memory"}]}, {"irq_pin": 4, "bus": 0, "qdev_id": "ehci", "irq": 0, "slot": 5, "class_info": {"class": 3075, "desc": "USB controller"}, "id": {"device": 9421, "subsystem-vendor": 6900, "vendor": 32902, "subsystem": 4352}, "function": 0, "regions": [{"prefetch": false, "mem_type_64": false, "bar": 0, "size": 4096, "address": -1, "type": "memory"}]}, {"irq_pin": 1, "bus": 0, "qdev_id": "pci-pt-03_00.0", "irq": 0, "slot": 6, "class_info": {"class": 0}, "id": {"device": 33128, "subsystem-vendor": 0, "vendor": 4332, "subsystem": 0}, "function": 0, "regions": [{"bar": 0, "size": 256, "address": -1, "type": "io"}, {"prefetch": false, "mem_type_64": true, "bar": 2, "size": 4096, "address": -1, "type": "memory"}, {"prefetch": false, "mem_type_64": true, "bar": 4, "size": 16384, "address": -1, "type": "memory"}]}]}], "id": 2020372738} [2025-08-26 13:21:07] [2025-08-26 13:21:07] wrote 2048 bytes to vchan [2025-08-26 13:21:07] wrote 1125 bytes to vchan [2025-08-26 13:21:07] vchan client disconnected [2025-08-26 13:21:07] [00:06.0] xen_pt_check_bar_overlap: Warning: Overlapped to device [00:02.0] Region: 1 (addr: 0xf0000000, len: 0x1000000) [2025-08-26 13:21:07] [00:06.0] xen_pt_region_update: Warning: Region: 4 (addr: 0xf0001000, len: 0x3000) is overlapped. [2025-08-26 13:21:09] {"timestamp": {"seconds": 1756214469, "microseconds": 28994}, "event": "DEVICE_DELETED", "data": {"path": "/machine/unattached/device[8]"}} [2025-08-26 13:21:09] {"timestamp": {"seconds": 1756214469, "microseconds": 32958}, "event": "DEVICE_DELETED", "data": {"path": "/machine/unattached/device[7]"}} [2025-08-26 13:21:09] {"timestamp": {"seconds": 1756214469, "microseconds": 33004}, "event": "DEVICE_DELETED", "data": {"path": "/machine/unattached/device[6]"}} [2025-08-26 13:21:09] {"timestamp": {"seconds": 1756214469, "microseconds": 33261}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral-anon/device[3]"}} [2025-08-26 13:21:09] {"timestamp": {"seconds": 1756214469, "microseconds": 33296}, "event": "DEVICE_DELETED", "data": {"path": "/machine/peripheral-anon/device[0]"}} [2025-08-26 13:21:12] [00:06.0] xen_pt_msixctrl_reg_write: enable MSI-X [2025-08-26 13:21:12] [00:06.0] msi_msix_update: Updating MSI-X with pirq 55 gvec 0xef gflags 0x0 (entry: 0x0) [2025-08-26 13:21:13] [00:06.0] msi_msix_update: Updating MSI-X with pirq 55 gvec 0x23 gflags 0x0 (entry: 0x0) [2025-08-26 13:41:45] [00:06.0] msix_set_enable: disabling MSI-X. [2025-08-26 13:41:45] [00:06.0] msi_msix_disable: Unbind MSI-X with pirq 55, gvec 0x23 [2025-08-26 13:41:45] [00:06.0] msi_msix_disable: Unmap MSI-X pirq 55 [2025-08-26 13:41:45] [00:06.0] xen_pt_msixctrl_reg_write: disable MSI-X {"timestamp": {"seconds": 1756215718, "microseconds": 455554}, "event": "SHUTDOWN", "data": {"guest": true, "reason": "guest-shutdown"}} [2025-08-26 13:41:58] {"timestamp": {"seconds": 1756215718, "microseconds": 456438}, "event": "STOP"} [2025-08-26 13:41:58] pcifront pci-0: Rescanning PCI Frontend Bus 0000:00 [2025-08-26 13:41:58] pci_bus 0000:00: busn_res: [bus 00-ff] is released [2025-08-26 13:41:58] ------------[ cut here ]------------ [2025-08-26 13:41:58] sysfs group 'power' not found for kobject '0000:00' [2025-08-26 13:41:58] WARNING: CPU: 0 PID: 13 at fs/sysfs/group.c:282 sysfs_remove_group+0x3a/0x6f -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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