Here is the stacktrace I spoke about: rmmod dell-wmi-sysman [ 81.809783] BUG: kernel NULL pointer dereference, address: 0000000000000048 [ 81.809786] #PF: supervisor read access in kernel mode [ 81.809787] #PF: error_code(0x0000) - not-present page [ 81.809788] PGD 101fbf067 P4D 101fbf067 PUD 100e23067 PMD 0 [ 81.809792] Oops: 0000 [#1] SMP [ 81.809793] CPU: 1 PID: 6833 Comm: rmmod Tainted: G O 5.11.0-64bit #1 [ 81.809795] Hardware name: /0DRR0P, BIOS 2.4.1 09/27/2018 [ 81.809796] RIP: 0010:sysfs_remove_file_ns+0x0/0x10 [ 81.809800] Code: 8b 47 08 48 8b 68 60 e8 7e e5 ff ff 48 89 df e8 06 d6 ff ff 48 89 ef 5b 5d e9 5c b7 20 00 66 66 66 2e 0f 1f 84 00 00 00 00 00 <48> 8b 7f 30 48 8b 36 e9 64 e6 ff ff 0f 1f 40 00 41 54 55 49 89 fc [ 81.809802] RSP: 0018:ffffc9000113beb0 EFLAGS: 00010246 [ 81.809803] RAX: 0000000000000000 RBX: ffffffffa01b6dc0 RCX: 0000000000000000 [ 81.809804] RDX: 0000000000000000 RSI: ffffffffa01b6060 RDI: 0000000000000018 [ 81.809805] RBP: 0000000000000081 R08: 0000000000000000 R09: 000000000000006e [ 81.809806] R10: ff6d606c7278725e R11: 006e616d7379735f R12: 0000000000000880 [ 81.809807] R13: 0000000000000880 R14: 0000000000000000 R15: 0000000000000000 [ 81.809808] FS: 0000000000000000(0000) GS:ffff88846ed00000(0063) knlGS:00000000f7d21940 [ 81.809810] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 81.809811] CR2: 0000000000000048 CR3: 0000000100e20001 CR4: 00000000003706e0 [ 81.809812] Call Trace: [ 81.809814] release_attributes_data+0x19/0xa3 [dell_wmi_sysman] [ 81.809817] sysman_exit+0x5/0xd8b [dell_wmi_sysman] [ 81.809819] __ia32_sys_delete_module+0x16b/0x240 [ 81.809822] __do_fast_syscall_32+0x56/0x80 [ 81.809826] do_fast_syscall_32+0x2f/0x70 [ 81.809828] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 81.809830] RIP: 0023:0xf7edc549 [ 81.809831] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 81.809833] RSP: 002b:00000000ffe08bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000081 [ 81.809834] RAX: ffffffffffffffda RBX: 00000000ffe08c00 RCX: 0000000000000880 [ 81.809835] RDX: 00000000ffe0b454 RSI: 0000000000000003 RDI: 00000000ffe08c00 [ 81.809836] RBP: 00000000ffe0b4a8 R08: 0000000000000000 R09: 0000000000000000 [ 81.809837] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 81.809838] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 81.809839] Modules linked in: dell_wmi_sysman(O-) wmi scsi_transport_fc scsi_dh_rdac scsi_dh_emc scsi_dh_alua scsi_dh_hp_sw xt_nat xt_REDIRECT iptable_nat nf_nat ipt_REJECT nf_reject_ipv4 xt_state iptable_filter ip_tables thermal fan ipv6 fuse dm_snapshot dm_bufio dm_round_robin dm_multipath psmouse ipmi_ssif pcspkr acpi_ipmi iTCO_wdt iTCO_vendor_support ipmi_si ipmi_msghandler ac intel_pch_thermal ie31200_edac [last unloaded: qla2xxx] [ 81.809857] CR2: 0000000000000048 [ 81.809859] ---[ end trace 175f62942dce486b ]--- [ 81.809859] RIP: 0010:sysfs_remove_file_ns+0x0/0x10 [ 81.809861] Code: 8b 47 08 48 8b 68 60 e8 7e e5 ff ff 48 89 df e8 06 d6 ff ff 48 89 ef 5b 5d e9 5c b7 20 00 66 66 66 2e 0f 1f 84 00 00 00 00 00 <48> 8b 7f 30 48 8b 36 e9 64 e6 ff ff 0f 1f 40 00 41 54 55 49 89 fc [ 81.809863] RSP: 0018:ffffc9000113beb0 EFLAGS: 00010246 [ 81.809864] RAX: 0000000000000000 RBX: ffffffffa01b6dc0 RCX: 0000000000000000 [ 81.809865] RDX: 0000000000000000 RSI: ffffffffa01b6060 RDI: 0000000000000018 [ 81.809866] RBP: 0000000000000081 R08: 0000000000000000 R09: 000000000000006e [ 81.809866] R10: ff6d606c7278725e R11: 006e616d7379735f R12: 0000000000000880 [ 81.809867] R13: 0000000000000880 R14: 0000000000000000 R15: 0000000000000000 [ 81.809868] FS: 0000000000000000(0000) GS:ffff88846ed00000(0063) knlGS:00000000f7d21940 [ 81.809869] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 81.809870] CR2: 0000000000000048 CR3: 0000000100e20001 CR4: 00000000003706e0 Am 18.02.21 um 11:57 schrieb Alexander Naumann: > I have seen this new option and wanted to test it on an R240 (OEM device). > > But it is not working. > > > I did compile this as a module and it was loading fine. But actually it > is not. > > This function call here returns 0: > > ret = init_bios_attr_set_interface(); > > > But "wmi_priv.bios_attr_wdev" is not set! > > So loading the module is returning with exit code 0 (what is wrong!). > Variable "ret" should be set to 1 in this case > > > Also unloading the module will crash (I guess because the sys entries do > not exists). > > I can send you an crashdump later on. > > > Any ideas why it is not working at all? > > > >
