Possible Bug
Roger H Newell
newell.roger at gmail.com
Thu Mar 31 11:08:38 EDT 2016
On Thu, Mar 31, 2016 at 12:18 PM, nick <xerofoify at gmail.com> wrote:
>
>
> On 2016-03-31 08:34 AM, Roger H Newell wrote:
>> Hi:
>>
>> I think I may have stumbled upon a USB bug. Before I send it off to
>> one of the larger lists I thought I should run it through here to be
>> sure its a bug and I have all the information. Could someone have a
>> look and advise ?
>>
>> I was having a problem mounting up a USB drive, so I had a look at
>> dmesg. The output is as follows. I'm running 4.5.0+ from gregs
>> staging-testing tree.
>>
>> [952620.256859] usb 1-6: new high-speed USB device number 4 using ehci-pci
>> [952620.389797] usb 1-6: New USB device found, idVendor=0781, idProduct=5530
>> [952620.389807] usb 1-6: New USB device strings: Mfr=1, Product=2,
>> SerialNumber=3
>> [952620.389813] usb 1-6: Product: Cruzer
>> [952620.389818] usb 1-6: Manufacturer: SanDisk
>> [952620.389823] usb 1-6: SerialNumber: 20060876510A09733592
>> [952620.397158] BUG: unable to handle kernel NULL pointer dereference
>> at 0000000000000805
>> [952620.397309] IP: [<ffffffff811e636b>] kmem_cache_alloc_trace+0x7b/0x1e0
>> [952620.397427] PGD 3db56067 PUD cb6cd067 PMD 0
>> [952620.397511] Oops: 0000 [#1] SMP
>> [952620.397573] Modules linked in: binfmt_misc snd_hda_codec_realtek
>> snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_codec
>> snd_hda_core snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event
>> snd_rawmidi snd_seq snd_seq_device snd_timer edac_mce_amd snd joydev
>> kvm_amd input_leds edac_core kvm soundcore serio_raw k10temp i2c_piix4
>> 8250_fintek asus_atk0110 mac_hid irqbypass parport_pc ppdev lp parport
>> autofs4 pata_acpi hid_generic usbhid hid amdkfd amd_iommu_v2 radeon
>> i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt
>> fb_sys_fops drm psmouse ahci pata_atiixp libahci r8169 mii wmi
>> [952620.398620] CPU: 1 PID: 18445 Comm: mtp-probe Not tainted 4.5.0+ #28
>> [952620.398726] Hardware name: System manufacturer System Product
>> Name/M5A78L-M LX PLUS, BIOS 0402 09/20/2011
>> [952620.398884] task: ffff88009bf68d00 ti: ffff8800499f0000 task.ti:
>> ffff8800499f0000
>> [952620.399006] RIP: 0010:[<ffffffff811e636b>] [<ffffffff811e636b>]
>> kmem_cache_alloc_trace+0x7b/0x1e0
>> [952620.399158] RSP: 0018:ffff8800499f3c70 EFLAGS: 00010206
>> [952620.399246] RAX: 0000000000000000 RBX: 00000000024080c0 RCX:
>> 000000000ae98088
>> [952620.399362] RDX: 000000000ae98087 RSI: 00000000024080c0 RDI:
>> 0000000000019b20
>> [952620.399477] RBP: ffff8800499f3cb0 R08: ffff88012fc59b20 R09:
>> ffff88012b003cc0
>> [952620.399593] R10: 0000000000000805 R11: fefefefefefefeff R12:
>> 00000000024080c0
>> [952620.399709] R13: ffffffff813736d3 R14: 00007f9bfa435040 R15:
>> ffff88012b003cc0
>> [952620.399826] FS: 00007f550c9a48c0(0000) GS:ffff88012fc40000(0000)
>> knlGS:0000000000000000
>> [952620.399956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> [952620.400050] CR2: 0000000000000805 CR3: 00000000ce839000 CR4:
>> 00000000000006e0
>> [952620.400165] Stack:
>> [952620.400201] 00000000024080c0 ffffffff8120bb2c 0000000000000002
>> ffff88000227d500
>> [952620.400335] ffff88000227d500 ffff8800499f3ef4 00007f9bfa435040
>> ffff8800499f3de0
>> [952620.400467] ffff8800499f3cc8 ffffffff813736d3 ffffffff81c9fe80
>> ffff8800499f3ce8
>> [952620.400599] Call Trace:
>> [952620.400649] [<ffffffff8120bb2c>] ? get_empty_filp+0x5c/0x1c0
>> [952620.400748] [<ffffffff813736d3>] apparmor_file_alloc_security+0x23/0x40
>> [952620.400861] [<ffffffff81335b53>] security_file_alloc+0x33/0x50
>> [952620.400961] [<ffffffff8120bb6a>] get_empty_filp+0x9a/0x1c0
>> [952620.401057] [<ffffffff812176ce>] path_openat+0x2e/0x1400
>> [952620.401149] [<ffffffff8121661a>] ? walk_component+0x3a/0x470
>> [952620.401246] [<ffffffff812146c9>] ? path_init+0x1d9/0x330
>> [952620.401339] [<ffffffff811a6e85>] ? __inc_zone_page_state+0x35/0x40
>> [952620.401444] [<ffffffff81219454>] ? putname+0x54/0x60
>> [952620.401530] [<ffffffff8121a38e>] do_filp_open+0x7e/0xe0
>> [952620.401620] [<ffffffff811e64b5>] ? kmem_cache_alloc_trace+0x1c5/0x1e0
>> [952620.401728] [<ffffffff811e629a>] ? kmem_cache_alloc+0x17a/0x1d0
>> [952620.401829] [<ffffffff812194b6>] ? getname_flags+0x56/0x1f0
>> [952620.401924] [<ffffffff81227606>] ? __alloc_fd+0x46/0x190
>> [952620.402016] [<ffffffff81208984>] do_sys_open+0x124/0x210
>> [952620.402107] [<ffffffff81207d48>] ? SyS_access+0x1e8/0x230
>> [952620.402200] [<ffffffff81208a8e>] SyS_open+0x1e/0x20
>> [952620.402286] [<ffffffff817ec736>] entry_SYSCALL_64_fastpath+0x1e/0xa8
>> [952620.402391] Code: 08 65 4c 03 05 3f 3e e2 7e 49 83 78 10 00 4d 8b
>> 10 0f 84 14 01 00 00 4d 85 d2 0f 84 0b 01 00 00 49 63 41 20 48 8d 4a
>> 01 49 8b 39 <49> 8b 1c 02 4c 89 d0 65 48 0f c7 0f 0f 94 c0 84 c0 74 bb
>> 49 63
>> [952620.402934] RIP [<ffffffff811e636b>] kmem_cache_alloc_trace+0x7b/0x1e0
>> [952620.403047] RSP <ffff8800499f3c70>
>> [952620.403106] CR2: 0000000000000805
>> [952620.445606] ---[ end trace e7adb7015192b3a3 ]---
>>
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>>
> In the fs/file_table.c file as from the root directory of your kernel tree change in the function,
> get_empty_flip change these lines:
> if (unlikely(error)) {
> file_free(f);
> return ERR_PTR(error);
> }
> to:
> if (unlikely(error))
> return ERR_PTR(error);
> and tell me if that fixes your issue.
> Nick
Seems to have worked, the error is is gone and I can mount the USB device.
dmesg output as follows
[ 32.538288] usb 1-5: new high-speed USB device number 2 using ehci-pci
[ 32.671122] usb 1-5: New USB device found, idVendor=0781, idProduct=5530
[ 32.671125] usb 1-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 32.671126] usb 1-5: Product: Cruzer
[ 32.671128] usb 1-5: Manufacturer: SanDisk
[ 32.671129] usb 1-5: SerialNumber: 20060876510A09733592
[ 32.697487] usb-storage 1-5:1.0: USB Mass Storage device detected
[ 32.697691] scsi host6: usb-storage 1-5:1.0
[ 32.697757] usbcore: registered new interface driver usb-storage
[ 32.702641] usbcore: registered new interface driver uas
[ 33.695126] scsi 6:0:0:0: Direct-Access SanDisk Cruzer
1.02 PQ: 0 ANSI: 2
[ 33.695382] sd 6:0:0:0: Attached scsi generic sg2 type 0
[ 33.696114] sd 6:0:0:0: [sdc] 7813120 512-byte logical blocks:
(4.00 GB/3.73 GiB)
[ 33.697739] sd 6:0:0:0: [sdc] Write Protect is off
[ 33.697742] sd 6:0:0:0: [sdc] Mode Sense: 03 00 00 00
[ 33.698740] sd 6:0:0:0: [sdc] No Caching mode page found
[ 33.698744] sd 6:0:0:0: [sdc] Assuming drive cache: write through
[ 33.707370] sdc: sdc1 sdc2
[ 33.710732] sd 6:0:0:0: [sdc] Attached SCSI removable disk
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