Comment 5 for bug 1656670

I see a crash in dmesg if I do twice “modprobe my_module”. On the terminal I see always the same error message: “modprobe: ERROR: could not insert 'my_module': Device or resource busy “. "lsmod | grep my_module" returns always no results

The first time I see in dmesg:

[ 719.768057] my_module: module verification failed: signature and/or required key missing - tainting kernel
[ 719.768358] my_module_init_struct: Phys start e3000000, start f9600000, nc-start f9a00000

The second time I see:

[ 1576.030967] perf interrupt took too long (5001 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
[43637.770909] my_module_init_struct: Phys start e3000000, start f9e00000, nc-start fa200000
[43638.998400] ------------[ cut here ]------------
[43638.998415] WARNING: CPU: 0 PID: 3862 at /build/linux-5Vy7q8/linux-4.4.0/fs/sysfs/dir.c:31 sysfs_warn_dup+0x60/0x70()
[43638.998418] sysfs: cannot create duplicate filename '/class/my_module'
[43638.998419] Modules linked in: my_module(OE+) lirc_dev rc_core jfs gpio_ich snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel coretemp kvm_intel snd_hda_codec snd_hda_core snd_hwdep kvm snd_pcm snd_seq_midi snd_seq_midi_event irqbypass snd_rawmidi snd_seq input_leds snd_seq_device snd_timer lpc_ich serio_raw snd soundcore shpchp 8250_fintek mac_hid hwmon_vid sunrpc eeprom parport_pc ppdev lp parport autofs4 uvesafb uas usb_storage psmouse ahci firewire_ohci i915 libahci firewire_core crc_itu_t pata_acpi video i2c_algo_bit r8169 drm_kms_helper fjes syscopyarea sysfillrect sysimgblt mii fb_sys_fops drm
[43638.998471] CPU: 0 PID: 3862 Comm: modprobe Tainted: G OE 4.4.0-59-generic #80-Ubuntu
[43638.998473] Hardware name: Kontron Technology 986LCD-M/mITX/986LCD-M/mITX, BIOS 080013 03/04/2011
[43638.998476] c1ad7967 1c7090b8 00000286 f17b7c64 c13ab85f f17b7ca4 c19f07a8 f17b7c94
[43638.998481] c1070427 c19f0774 f17b7cc4 00000f16 c19f07a8 0000001f c1250120 c1250120
[43638.998487] f1112000 f20e1400 f63ac1b0 f17b7cb0 c107049e 00000009 f17b7ca4 c19f0774
[43638.998492] Call Trace:
[43638.998500] [<c13ab85f>] dump_stack+0x58/0x79
[43638.998505] [<c1070427>] warn_slowpath_common+0x87/0xc0
[43638.998508] [<c1250120>] ? sysfs_warn_dup+0x60/0x70
[43638.998511] [<c1250120>] ? sysfs_warn_dup+0x60/0x70
[43638.998514] [<c107049e>] warn_slowpath_fmt+0x3e/0x60
[43638.998517] [<c1250120>] sysfs_warn_dup+0x60/0x70
[43638.998520] [<c12501f8>] sysfs_create_dir_ns+0x78/0x90
[43638.998524] [<c13ae531>] kobject_add_internal+0xa1/0x360
[43638.998528] [<c118d635>] ? kfree_const+0x25/0x30
[43638.998531] [<c13ae91c>] kset_register+0x3c/0x60
[43638.998535] [<c14fef22>] __class_register+0xc2/0x1e0
[43638.998538] [<c14ff068>] ? __class_create+0x28/0x70
[43638.998541] [<c14ff084>] __class_create+0x44/0x70
[43638.998544] [<f8e21000>] ? 0xf8e21000
[43638.998549] [<f8e21040>] my_module_init+0x40/0x1000 [my_module]
[43638.998553] [<c100211a>] do_one_initcall+0xaa/0x200
[43638.998555] [<f8e21000>] ? 0xf8e21000
[43638.998560] [<c11ac3c5>] ? free_vmap_area_noflush+0x45/0xa0
[43638.998564] [<c11c3565>] ? kmem_cache_alloc_trace+0x185/0x1e0
[43638.998568] [<c11704fa>] ? do_init_module+0x21/0x1a6
[43638.998571] [<c11704fa>] ? do_init_module+0x21/0x1a6
[43638.998574] [<c1170529>] do_init_module+0x50/0x1a6
[43638.998579] [<c10f8953>] load_module+0x1533/0x1a40
[43638.998583] [<c10f5519>] ? copy_module_from_fd.isra.53+0xf9/0x190
[43638.998586] [<c10f9095>] SyS_finit_module+0xa5/0xf0
[43638.998589] [<c118d9d3>] ? vm_mmap_pgoff+0xa3/0xc0
[43638.998593] [<c100393d>] do_fast_syscall_32+0x8d/0x150
[43638.998598] [<c17b8b1c>] sysenter_past_esp+0x3d/0x61
[43638.998600] ---[ end trace 1e884c0f3bc9cdbd ]---
[43638.998602] ------------[ cut here ]------------
[43638.998606] WARNING: CPU: 0 PID: 3862 at /build/linux-5Vy7q8/linux-4.4.0/lib/kobject.c:240 kobject_add_internal+0x2e2/0x360()
[43638.998609] kobject_add_internal failed for my_module with -EEXIST, don't try to register things with the same name in the same directory.
[43638.998610] Modules linked in: my_module(OE+) lirc_dev rc_core jfs gpio_ich snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel coretemp kvm_intel snd_hda_codec snd_hda_core snd_hwdep kvm snd_pcm snd_seq_midi snd_seq_midi_event irqbypass snd_rawmidi snd_seq input_leds snd_seq_device snd_timer lpc_ich serio_raw snd soundcore shpchp 8250_fintek mac_hid hwmon_vid sunrpc eeprom parport_pc ppdev lp parport autofs4 uvesafb uas usb_storage psmouse ahci firewire_ohci i915 libahci firewire_core crc_itu_t pata_acpi video i2c_algo_bit r8169 drm_kms_helper fjes syscopyarea sysfillrect sysimgblt mii fb_sys_fops drm
[43638.998646] CPU: 0 PID: 3862 Comm: modprobe Tainted: G W OE 4.4.0-59-generic #80-Ubuntu
[43638.998648] Hardware name: Kontron Technology 986LCD-M/mITX/986LCD-M/mITX, BIOS 080013 03/04/2011
[43638.998650] c1ad7967 1c7090b8 00000286 f17b7ca8 c13ab85f f17b7ce8 c1a0bfe0 f17b7cd8
[43638.998655] c1070427 c1a0c218 f17b7d08 00000f16 c1a0bfe0 000000f0 c13ae772 c13ae772
[43638.998660] f2444d0c ffffffef 00000000 f17b7cf4 c107049e 00000009 f17b7ce8 c1a0c218
[43638.998665] Call Trace:
[43638.998668] [<c13ab85f>] dump_stack+0x58/0x79
[43638.998672] [<c1070427>] warn_slowpath_common+0x87/0xc0
[43638.998675] [<c13ae772>] ? kobject_add_internal+0x2e2/0x360
[43638.998677] [<c13ae772>] ? kobject_add_internal+0x2e2/0x360
[43638.998680] [<c107049e>] warn_slowpath_fmt+0x3e/0x60
[43638.998683] [<c13ae772>] kobject_add_internal+0x2e2/0x360
[43638.998686] [<c13ae91c>] kset_register+0x3c/0x60
[43638.998689] [<c14fef22>] __class_register+0xc2/0x1e0
[43638.998692] [<c14ff068>] ? __class_create+0x28/0x70
[43638.998694] [<c14ff084>] __class_create+0x44/0x70
[43638.998696] [<f8e21000>] ? 0xf8e21000
[43638.998700] [<f8e21040>] my_module_init+0x40/0x1000 [my_module]
[43638.998703] [<c100211a>] do_one_initcall+0xaa/0x200
[43638.998705] [<f8e21000>] ? 0xf8e21000
[43638.998708] [<c11ac3c5>] ? free_vmap_area_noflush+0x45/0xa0
[43638.998711] [<c11c3565>] ? kmem_cache_alloc_trace+0x185/0x1e0
[43638.998714] [<c11704fa>] ? do_init_module+0x21/0x1a6
[43638.998717] [<c11704fa>] ? do_init_module+0x21/0x1a6
[43638.998720] [<c1170529>] do_init_module+0x50/0x1a6
[43638.998723] [<c10f8953>] load_module+0x1533/0x1a40
[43638.998727] [<c10f5519>] ? copy_module_from_fd.isra.53+0xf9/0x190
[43638.998730] [<c10f9095>] SyS_finit_module+0xa5/0xf0
[43638.998733] [<c118d9d3>] ? vm_mmap_pgoff+0xa3/0xc0
[43638.998736] [<c100393d>] do_fast_syscall_32+0x8d/0x150
[43638.998739] [<c17b8b1c>] sysenter_past_esp+0x3d/0x61
[43638.998742] ---[ end trace 1e884c0f3bc9cdbe ]---