On Thu, 31 Mar 2016 10:04:47 -0230, Roger H Newell said: > I think I may have stumbled upon a USB bug. Before I send it off to Looks like an apparmor bug, not USB. Quite likely the same problem as these guys hit, as the traceback is the same: http://askubuntu.com/questions/748119/ubuntu-15-10-hangs-after-suspend-resume-inspiron-7559 https://github.com/IRATI/stack/issues/470 (And other hits) Seems to be a long-standing issue, that second link is from Feb 2015. On the other hand, all the hits appear to be in mailing lists *other* than ones where apparmor guys were likely to see it. I'm adding a cc: to the apparmor guys. > 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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