The named commit (6402c796d3) causes a process to hang indefinitely in usb_kill_urb(). Reverting it fixes the problem. The bug also prevents suspend/shutdown/reboot from completing, presumably due to the hanging process. (Cc'ing Stephen Warren because I only found his report after I bisected it myself. Do you also see a blocked process?) This is the hanging process on my system: [ 240.364085] INFO: task colord-sane:3619 blocked for more than 120 seconds. [ 240.364090] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.364093] colord-sane D 0000000000001388 0 3619 3602 0x00000000 [ 240.364099] ffff8801255cd818 0000000000000046 0000000000000296 ffffffff81c11400 [ 240.364105] ffff8801255cd7c8 ffff880127488000 ffff8801255cdfd8 ffff8801255cdfd8 [ 240.364112] 0000000000013600 ffff880127488000 ffff8801255cd828 ffff8801234536c0 [ 240.364118] Call Trace: [ 240.364127] [<ffffffff81685af0>] schedule+0x65/0x67 [ 240.364132] [<ffffffff8141a235>] usb_kill_urb+0xb5/0xd3 [ 240.364138] [<ffffffff8109713a>] ? bit_waitqueue+0x7a/0x7a [ 240.364143] [<ffffffff8141aa37>] usb_start_wait_urb+0xb2/0x173 [ 240.364148] [<ffffffff8141ad21>] usb_control_msg+0xd0/0x102 [ 240.364152] [<ffffffff8141ae07>] ? usb_get_status+0x3d/0xb0 [ 240.364158] [<ffffffff8114fb80>] ? kmem_cache_alloc_trace+0x4b/0xc9 [ 240.364163] [<ffffffff81686ce2>] ? _raw_spin_unlock_irqrestore+0x3f/0x6e [ 240.364167] [<ffffffff8141ae4e>] usb_get_status+0x84/0xb0 [ 240.364172] [<ffffffff81686d03>] ? _raw_spin_unlock_irqrestore+0x60/0x6e [ 240.364177] [<ffffffff8141474c>] usb_port_resume+0x37c/0x5b4 [ 240.364183] [<ffffffff810c372a>] ? mark_held_locks+0x55/0x99 [ 240.364187] [<ffffffff81686d3e>] ? _raw_spin_unlock_irq+0x2d/0x5a [ 240.364193] [<ffffffff81424794>] generic_resume+0x1c/0x1e [ 240.364197] [<ffffffff8141cd94>] usb_resume_both+0x94/0x106 [ 240.364202] [<ffffffff8141defb>] ? usb_runtime_suspend+0x5d/0x5d [ 240.364206] [<ffffffff8141df15>] usb_runtime_resume+0x1a/0x1c [ 240.364211] [<ffffffff813a85bd>] __rpm_callback+0x34/0x5b [ 240.364216] [<ffffffff813a863a>] rpm_callback+0x56/0x79 [ 240.364220] [<ffffffff813a960b>] rpm_resume+0x38a/0x4a7 [ 240.364225] [<ffffffff816867a8>] ? _raw_spin_lock_irqsave+0x51/0x5c [ 240.364230] [<ffffffff813a9921>] ? __pm_runtime_resume+0x5d/0x88 [ 240.364234] [<ffffffff813a992f>] __pm_runtime_resume+0x6b/0x88 [ 240.364239] [<ffffffff8141d7ad>] usb_autoresume_device+0x20/0x3f [ 240.364244] [<ffffffff814244f3>] usbdev_open+0xc7/0x245 [ 240.364249] [<ffffffff8115d14c>] chrdev_open+0x130/0x15b [ 240.364254] [<ffffffff8109d115>] ? lg_local_unlock+0x3f/0x5e [ 240.364259] [<ffffffff8115d01c>] ? cdev_put+0x26/0x26 [ 240.364264] [<ffffffff81158182>] do_dentry_open.isra.17+0x16b/0x211 [ 240.364268] [<ffffffff81158249>] finish_open+0x21/0x2d [ 240.364273] [<ffffffff81164e3e>] do_last.isra.59+0x7dc/0x962 [ 240.364278] [<ffffffff81162c32>] ? inode_permission+0x45/0x47 [ 240.364282] [<ffffffff81162cf6>] ? link_path_walk+0xc2/0x43e [ 240.364287] [<ffffffff81165089>] path_openat.isra.60+0xc5/0x304 [ 240.364292] [<ffffffff811655c7>] do_filp_open+0x38/0x86 [ 240.364297] [<ffffffff8116f05a>] ? spin_unlock+0x9/0xb [ 240.364302] [<ffffffff8116fcab>] ? __alloc_fd+0xf3/0x104 [ 240.364307] [<ffffffff81158eb6>] do_sys_open+0x6c/0xf9 [ 240.364311] [<ffffffff81158f64>] sys_open+0x21/0x23 [ 240.364316] [<ffffffff8168d286>] system_call_fastpath+0x1a/0x1f [ 240.364319] INFO: lockdep is turned off. I tested my USB hardware with Alan's patch/program and it is susceptible to the bug the problematic commit tries to work around, my hardware is: 00:1a.7 USB controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2 (prog-if 20 [EHCI]) Subsystem: ASUSTeK Computer Inc. P5Q Deluxe Motherboard Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin C routed to IRQ 18 Region 0: Memory at fe8ffc00 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- Capabilities: [58] Debug port: BAR=1 offset=00a0 Capabilities: [98] Vendor Specific Information: Len=06 <?> Kernel driver in use: ehci-pci -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
