Hello,
I've just tested some things with 3.10-rc5+ and discovered that
rtc_device_unregister is broken. This is most likely because of the
switch to devm*. As 3.10 is already at -rc5, I'm posting this without
having had a deeper look at the problem and writing a patch. Maybe
someone is faster than I and can fix it before I found the time for a
solution or before 3.10 becomes final.
Therefor here are just the message my kernel 3.10-rc5 died with, when
removing an USB-RTC. I assume removing a RTC wasn't tested because
almost no one does such. ;)
Regards,
Alexander Holler
-----snip-----
[ 38.123288] usb 1-1.2: USB disconnect, device number 3
[ 38.123813] ------------[ cut here ]------------
[ 38.123822] WARNING: at include/linux/kref.h:47 kobject_get+0x3f/0x50()
[ 38.123824] Modules linked in: msr nfs lockd sunrpc rfcomm bnep
xt_LOG xt_limit nf_conntrack_ipv6 xt_recent nf_defrag_ipv6 xt_conntrack
iptable_filter iptable_nat ip6table_filter nf_conntrack_ipv4 ip6_tables
nf_defrag_ipv4 nf_nat_ipv4 ipv6 nf_nat nf_conntrack uvcvideo
videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb
bluetooth intel_powerclamp coretemp kvm_intel kvm arc4 crc32_pclmul
crc32c_intel iwldvm ghash_clmulni_intel mac80211 snd_hda_codec_hdmi
snd_hda_codec_realtek aesni_intel iwlwifi aes_x86_64 lrw gf128mul
glue_helper ablk_helper cdc_acm cryptd cfg80211 snd_hda_intel microcode
samsung_laptop joydev rfkill snd_hda_codec xhci_hcd snd_hwdep snd_pcm
snd_page_alloc snd_timer snd lpc_ich soundcore
[ 38.123873] CPU: 1 PID: 342 Comm: khubd Not tainted
3.10.0-rc5-00229-gb7f7c9a-dirty #299
[ 38.123876] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
900X3C/900X3D/900X4C/900X4D/SAMSUNG_NP1234567890, BIOS P06AAC 02/08/2013
[ 38.123878] ffffffff81479890 0000000000000000 ffffffff810330ca
ffff88021636e000
[ 38.123881] ffff880215858010 0000000000000002 ffff880216330a40
ffff880215187400
[ 38.123885] ffffffff811df89f ffff8802161243c0 ffff88021636e010
00000000fffffffc
[ 38.123889] Call Trace:
[ 38.123895] [<ffffffff81479890>] ? dump_stack+0xd/0x17
[ 38.123902] [<ffffffff810330ca>] ? warn_slowpath_common+0x6a/0xa0
[ 38.123905] [<ffffffff811df89f>] ? kobject_get+0x3f/0x50
[ 38.123910] [<ffffffff81307af2>] ? get_device+0x12/0x30
[ 38.123915] [<ffffffff8137ee86>] ? rtc_device_unregister+0x16/0x90
[ 38.123920] [<ffffffff8130eb53>] ? release_nodes+0x143/0x1d0
[ 38.123923] [<ffffffff8130b86e>] ? __device_release_driver+0x7e/0xf0
[ 38.123927] [<ffffffff81309f60>] ? bus_get_device_klist+0x10/0x10
[ 38.123929] [<ffffffff8130bac5>] ? device_release_driver+0x25/0x40
[ 38.123932] [<ffffffff8130b37d>] ? bus_remove_device+0xcd/0x100
[ 38.123936] [<ffffffff81308b97>] ? device_del+0x107/0x190
[ 38.123942] [<ffffffff81319010>] ? mfd_cell_disable+0x60/0x60
[ 38.123945] [<ffffffff8130d587>] ? platform_device_del+0x17/0xb0
[ 38.123948] [<ffffffff8130d9c9>] ? platform_device_unregister+0x9/0x20
[ 38.123952] [<ffffffff8131904b>] ? mfd_remove_devices_fn+0x3b/0x50
[ 38.123956] [<ffffffff81307dee>] ? device_for_each_child+0x2e/0x60
[ 38.123960] [<ffffffff81318f9e>] ? mfd_remove_devices+0x1e/0x30
[ 38.123965] [<ffffffff8139fb86>] ? sensor_hub_remove+0x66/0xf0
[ 38.123969] [<ffffffff81315d0d>] ? rpm_idle+0x1d/0x1d0
[ 38.123973] [<ffffffff81397fb3>] ? hid_device_remove+0x73/0xf0
[ 38.123976] [<ffffffff8130b866>] ? __device_release_driver+0x76/0xf0
[ 38.123980] [<ffffffff81309f60>] ? bus_get_device_klist+0x10/0x10
[ 38.123983] [<ffffffff8130bac5>] ? device_release_driver+0x25/0x40
[ 38.123986] [<ffffffff8130b37d>] ? bus_remove_device+0xcd/0x100
[ 38.123991] [<ffffffff81308b97>] ? device_del+0x107/0x190
[ 38.123995] [<ffffffff81397b89>] ? hid_destroy_device+0x29/0x60
[ 38.123999] [<ffffffff813a158e>] ? usbhid_disconnect+0x1e/0x40
[ 38.124004] [<ffffffff81353b8a>] ? usb_unbind_interface+0x6a/0x1c0
[ 38.124007] [<ffffffff8130b866>] ? __device_release_driver+0x76/0xf0
[ 38.124011] [<ffffffff81309f60>] ? bus_get_device_klist+0x10/0x10
[ 38.124014] [<ffffffff8130bac5>] ? device_release_driver+0x25/0x40
[ 38.124016] [<ffffffff8130b37d>] ? bus_remove_device+0xcd/0x100
[ 38.124020] [<ffffffff81308b97>] ? device_del+0x107/0x190
[ 38.124023] [<ffffffff81351834>] ? usb_disable_device+0x94/0x1d0
[ 38.124028] [<ffffffff81349586>] ? usb_disconnect+0x96/0x190
[ 38.124032] [<ffffffff8134aba9>] ? hub_thread+0x319/0x12d0
[ 38.124038] [<ffffffff8147c5db>] ? __schedule+0x28b/0x690
[ 38.124042] [<ffffffff810536c0>] ? finish_wait+0x90/0x90
[ 38.124046] [<ffffffff8134a890>] ? hub_port_debounce+0xe0/0xe0
[ 38.124049] [<ffffffff81053123>] ? kthread+0xb3/0xc0
[ 38.124053] [<ffffffff81053070>] ? kthread_create_on_node+0x110/0x110
[ 38.124057] [<ffffffff8147eaec>] ? ret_from_fork+0x7c/0xb0
[ 38.124060] [<ffffffff81053070>] ? kthread_create_on_node+0x110/0x110
[ 38.124063] ---[ end trace f896f8f65422d83d ]---
[ 38.124075] BUG: unable to handle kernel NULL pointer dereference at
00000000000000a4
[ 38.126012] IP: [<ffffffff81381e95>] rtc_sysfs_del_device+0x15/0x60
[ 38.127757] PGD 0
[ 38.129536] Oops: 0000 [#1] SMP
[ 38.131261] Modules linked in: msr nfs lockd sunrpc rfcomm bnep
xt_LOG xt_limit nf_conntrack_ipv6 xt_recent nf_defrag_ipv6 xt_conntrack
iptable_filter iptable_nat ip6table_filter nf_conntrack_ipv4 ip6_tables
nf_defrag_ipv4 nf_nat_ipv4 ipv6 nf_nat nf_conntrack uvcvideo
videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb
bluetooth intel_powerclamp coretemp kvm_intel kvm arc4 crc32_pclmul
crc32c_intel iwldvm ghash_clmulni_intel mac80211 snd_hda_codec_hdmi
snd_hda_codec_realtek aesni_intel iwlwifi aes_x86_64 lrw gf128mul
glue_helper ablk_helper cdc_acm cryptd cfg80211 snd_hda_intel microcode
samsung_laptop joydev rfkill snd_hda_codec xhci_hcd snd_hwdep snd_pcm
snd_page_alloc snd_timer snd lpc_ich soundcore
[ 38.139094] CPU: 1 PID: 342 Comm: khubd Tainted: G W
3.10.0-rc5-00229-gb7f7c9a-dirty #299
[ 38.141075] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
900X3C/900X3D/900X4C/900X4D/SAMSUNG_NP1234567890, BIOS P06AAC 02/08/2013
[ 38.143095] task: ffff880216102ed0 ti: ffff880216388000 task.ti:
ffff880216388000
[ 38.145114] RIP: 0010:[<ffffffff81381e95>] [<ffffffff81381e95>]
rtc_sysfs_del_device+0x15/0x60
[ 38.147160] RSP: 0018:ffff8802163899f8 EFLAGS: 00010296
[ 38.149191] RAX: 0000000000000000 RBX: ffff88021636e000 RCX:
0000000000000006
[ 38.151229] RDX: 0000000000000007 RSI: 0000000000000046 RDI:
ffff88021f28ce50
[ 38.153264] RBP: ffff88021636e2a8 R08: 000000000000000a R09:
0000000000000339
[ 38.155288] R10: 0000000000000000 R11: 0000000000000338 R12:
0000000000000002
[ 38.157304] R13: ffff880216330a40 R14: ffff880215187400 R15:
0000000000000000
[ 38.159316] FS: 0000000000000000(0000) GS:ffff88021f280000(0000)
knlGS:0000000000000000
[ 38.161336] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 38.163347] CR2: 00000000000000a4 CR3: 000000000180b000 CR4:
00000000001407e0
[ 38.165366] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 38.167380] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 38.169381] Stack:
[ 38.171355] ffff88021636e000 ffffffff8137eea2 00000000fffffffc
ffff880216389a28
[ 38.173376] ffff880215858010 ffffffff8130eb53 ffff880215187400
ffff880216330a40
[ 38.175388] ffff880215858010 ffffffff8184ea08 ffffffff81848b80
00000000fffffffc
[ 38.177393] Call Trace:
[ 38.179368] [<ffffffff8137eea2>] ? rtc_device_unregister+0x32/0x90
[ 38.181361] [<ffffffff8130eb53>] ? release_nodes+0x143/0x1d0
[ 38.183343] [<ffffffff8130b86e>] ? __device_release_driver+0x7e/0xf0
[ 38.185316] [<ffffffff81309f60>] ? bus_get_device_klist+0x10/0x10
[ 38.187280] [<ffffffff8130bac5>] ? device_release_driver+0x25/0x40
[ 38.189233] [<ffffffff8130b37d>] ? bus_remove_device+0xcd/0x100
[ 38.191175] [<ffffffff81308b97>] ? device_del+0x107/0x190
[ 38.193101] [<ffffffff81319010>] ? mfd_cell_disable+0x60/0x60
[ 38.195013] [<ffffffff8130d587>] ? platform_device_del+0x17/0xb0
[ 38.196919] [<ffffffff8130d9c9>] ? platform_device_unregister+0x9/0x20
[ 38.198811] [<ffffffff8131904b>] ? mfd_remove_devices_fn+0x3b/0x50
[ 38.200695] [<ffffffff81307dee>] ? device_for_each_child+0x2e/0x60
[ 38.202568] [<ffffffff81318f9e>] ? mfd_remove_devices+0x1e/0x30
[ 38.204431] [<ffffffff8139fb86>] ? sensor_hub_remove+0x66/0xf0
[ 38.206281] [<ffffffff81315d0d>] ? rpm_idle+0x1d/0x1d0
[ 38.208138] [<ffffffff81397fb3>] ? hid_device_remove+0x73/0xf0
[ 38.210019] [<ffffffff8130b866>] ? __device_release_driver+0x76/0xf0
[ 38.211915] [<ffffffff81309f60>] ? bus_get_device_klist+0x10/0x10
[ 38.213830] [<ffffffff8130bac5>] ? device_release_driver+0x25/0x40
[ 38.215737] [<ffffffff8130b37d>] ? bus_remove_device+0xcd/0x100
[ 38.217636] [<ffffffff81308b97>] ? device_del+0x107/0x190
[ 38.219522] [<ffffffff81397b89>] ? hid_destroy_device+0x29/0x60
[ 38.221420] [<ffffffff813a158e>] ? usbhid_disconnect+0x1e/0x40
[ 38.223331] [<ffffffff81353b8a>] ? usb_unbind_interface+0x6a/0x1c0
[ 38.225255] [<ffffffff8130b866>] ? __device_release_driver+0x76/0xf0
[ 38.227178] [<ffffffff81309f60>] ? bus_get_device_klist+0x10/0x10
[ 38.229078] [<ffffffff8130bac5>] ? device_release_driver+0x25/0x40
[ 38.230967] [<ffffffff8130b37d>] ? bus_remove_device+0xcd/0x100
[ 38.232828] [<ffffffff81308b97>] ? device_del+0x107/0x190
[ 38.234653] [<ffffffff81351834>] ? usb_disable_device+0x94/0x1d0
[ 38.236473] [<ffffffff81349586>] ? usb_disconnect+0x96/0x190
[ 38.238291] [<ffffffff8134aba9>] ? hub_thread+0x319/0x12d0
[ 38.240045] [<ffffffff8147c5db>] ? __schedule+0x28b/0x690
[ 38.241719] [<ffffffff810536c0>] ? finish_wait+0x90/0x90
[ 38.243320] [<ffffffff8134a890>] ? hub_port_debounce+0xe0/0xe0
[ 38.244849] [<ffffffff81053123>] ? kthread+0xb3/0xc0
[ 38.246338] [<ffffffff81053070>] ? kthread_create_on_node+0x110/0x110
[ 38.247794] [<ffffffff8147eaec>] ? ret_from_fork+0x7c/0xb0
[ 38.249212] [<ffffffff81053070>] ? kthread_create_on_node+0x110/0x110
[ 38.250613] Code: 73 81 5b 31 c0 e9 0c 68 f8 ff 66 66 66 2e 0f 1f 84
00 00 00 00 00 53 31 c0 48 89 fb 48 c7 c7 fd 18 72 81 e8 e1 51 0f 00 48
8b 03 <f6> 80 a4 00 00 00 01 74 0e 48 8b 83 a0 02 00 00 48 83 78 30 00
[ 38.253900] RIP [<ffffffff81381e95>] rtc_sysfs_del_device+0x15/0x60
[ 38.255476] RSP <ffff8802163899f8>
[ 38.257038] CR2: 00000000000000a4
[ 38.258610] ---[ end trace f896f8f65422d83e ]---
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