2.6.29.5: Oops when unplugging Moschip 7840/7820 USB serial device

Discussion:

Jeremy Fitzhardinge

2009-07-09 20:56:49 UTC

I unplugged a Moschip 7840/7820 USB serial adapter, and it oopsed. I had been using it
with picoterm, but it was not open at the time I unplugged it.

Thanks,
J

BUG: unable to handle kernel NULL pointer dereference at 00000000000000b4
IP: [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
PGD 12e19c067 PUD 12e19d067 PMD 0
Oops: 0002 [#1] SMP
last sysfs file: /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq
CPU 0
Modules linked in: mos7840 usbserial joydev aes_x86_64 aes_generic hidp fuse ipt_MASQUERADE iptable_nat nf_nat rfcomm bridge stp llc bnep sco l2cap coretemp sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand acpi_cpufreq freq_table dm_multipath kvm_intel kvm uinput snd_hda_codec_conexant snd_hda_intel snd_hda_codec arc4 ecb snd_hwdep thinkpad_acpi iwlagn usb_storage snd_pcm hwmon btusb e1000e pcspkr iwlcore snd_timer iTCO_wdt lib80211 iTCO_vendor_support mac80211 i2c_i801 wmi snd bluetooth cfg80211 soundcore snd_page_alloc i915 drm i2c_algo_bit i2c_core video output [last unloaded: microcode]
Pid: 27, comm: khubd Not tainted 2.6.29.5-191.fc11.x86_64 #1 74542GU
RIP: 0010:[<ffffffff81029eb5>] [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
RSP: 0018:ffff88013a413ba0 EFLAGS: 00010046
RAX: 0000000000000100 RBX: 00000000000000b4 RCX: 000000000010000f
RDX: ffff88013a413af0 RSI: 0000000000000203 RDI: 00000000000000b4
RBP: ffff88013a413ba0 R08: ffffffff815fcf28 R09: ffff880073f51c00
R10: 0000000000000003 R11: ffff88013a438818 R12: 0000000000000203
R13: ffff880073f51c10 R14: 0000000000000002 R15: 00000000000000b4
FS: 0000000000000000(0000) GS:ffffffff817b7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00000000000000b4 CR3: 000000012e199000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process khubd (pid: 27, threadinfo ffff88013a412000, task ffff88013a40ae00)
Stack:
ffff88013a413bb0 ffffffff81029f7f ffff88013a413bd0 ffffffff813abf94
ffff880073f51c00 0000000000000000 ffff88013a413c10 ffffffffa0399afa
ffff88013a413c10 ffff880073f51c00 ffff880119898800 0000000000000000
Call Trace:
[<ffffffff81029f7f>] default_spin_lock_flags+0x9/0xe
[<ffffffff813abf94>] _spin_lock_irqsave+0x32/0x3b
[<ffffffffa0399afa>] mos7840_shutdown+0x93/0x120 [mos7840]
[<ffffffffa038de76>] usb_serial_disconnect+0xe9/0x152 [usbserial]
[<ffffffff812a3d56>] usb_unbind_interface+0x6e/0xec
[<ffffffff8125375f>] __device_release_driver+0x68/0x89
[<ffffffff8125386f>] device_release_driver+0x26/0x33
[<ffffffff81252de1>] bus_remove_device+0xa4/0xb9
[<ffffffff8125165d>] device_del+0x135/0x189
[<ffffffff812a135c>] usb_disable_device+0x96/0x10d
[<ffffffff8129ce29>] usb_disconnect+0xa1/0x124
[<ffffffff8129dc12>] hub_thread+0x4e1/0xe8f
[<ffffffff8105c8d7>] ? autoremove_wake_function+0x0/0x39
[<ffffffff8129d731>] ? hub_thread+0x0/0xe8f
[<ffffffff8105c541>] kthread+0x4d/0x78
[<ffffffff8101264a>] child_rip+0xa/0x20
[<ffffffff81011f67>] ? restore_args+0x0/0x30
[<ffffffff8105c4f4>] ? kthread+0x0/0x78
[<ffffffff81012640>] ? child_rip+0x0/0x20
Code: 9c 02 81 44 89 c6 48 89 c7 e8 0a fb ff ff eb 0f 0f b7 f6 40 0f b6 ff 48 89 c2 e8 1c fb ff ff c9 c3 90 55 b8 00 01 00 00 48 89 e5 <f0> 66 0f c1 07 38 e0 74 06 f3 90 8a 07 eb f6 c9 c3 55 48 89 e5
RIP [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
RSP <ffff88013a413ba0>
CR2: 00000000000000b4
---[ end trace 8b6fd3d1bbb45aa9 ]---

Alan Stern

2009-07-09 21:36:30 UTC

Permalink

Post by Jeremy Fitzhardinge
I unplugged a Moschip 7840/7820 USB serial adapter, and it oopsed. I had been using it
with picoterm, but it was not open at the time I unplugged it.
Thanks,
J
BUG: unable to handle kernel NULL pointer dereference at 00000000000000b4
IP: [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
PGD 12e19c067 PUD 12e19d067 PMD 0
Oops: 0002 [#1] SMP
last sysfs file: /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq
CPU 0
Modules linked in: mos7840 usbserial joydev aes_x86_64 aes_generic hidp fuse ipt_MASQUERADE iptable_nat nf_nat rfcomm bridge stp llc bnep sco l2cap coretemp sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand acpi_cpufreq freq_table dm_multipath kvm_intel kvm uinput snd_hda_codec_conexant snd_hda_intel snd_hda_codec arc4 ecb snd_hwdep thinkpad_acpi iwlagn usb_storage snd_pcm hwmon btusb e1000e pcspkr iwlcore snd_timer iTCO_wdt lib80211 iTCO_vendor_support mac80211 i2c_i801 wmi snd bluetooth cfg80211 soundcore snd_page_alloc i915 drm i2c_algo_bit i2c_core video output [last unloaded: microcode]
Pid: 27, comm: khubd Not tainted 2.6.29.5-191.fc11.x86_64 #1 74542GU
RIP: 0010:[<ffffffff81029eb5>] [<ffffffff81029eb5>] __ticket_spin_lock+0x9/0x1a
[<ffffffff81029f7f>] default_spin_lock_flags+0x9/0xe
[<ffffffff813abf94>] _spin_lock_irqsave+0x32/0x3b
[<ffffffffa0399afa>] mos7840_shutdown+0x93/0x120 [mos7840]

The fix for this bug is in 2.6.30.1, but it hasn't been added to the
2.6.29.stable tree (or 2.6.27.stable).

Alan Stern

Greg KH

2009-07-09 21:42:45 UTC

Permalink

Post by Alan Stern

The fix for this bug is in 2.6.30.1, but it hasn't been added to the
2.6.29.stable tree (or 2.6.27.stable).

.29 is no longer being maintained.

I didn't think the change was needed for .27, is it?

thanks,

greg k-h

Alan Stern

2009-07-09 22:11:34 UTC

Permalink

Post by Greg KH

Post by Alan Stern

The fix for this bug is in 2.6.30.1, but it hasn't been added to the
2.6.29.stable tree (or 2.6.27.stable).

.29 is no longer being maintained.
I didn't think the change was needed for .27, is it?

No -- I forgot for a moment where the dividing line was.

Alan Stern