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    SubjectRe: WARNING: at kernel/power/main.c:176 suspend_test_finish+0x70/0x80()
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    On Friday, 10 of October 2008, Parag Warudkar wrote:
    > 2.6.27 seems to be taking long time to resume, it hits this WARN_ON in
    > kernel/power/main.c:176 suspend_test_finish -
    > Never seen earlier.

    Resuming devices takes too much time (more than 5 sec. actually)
    and the stack trace indicates USB.

    Can you test with the USB modules unloaded?


    > [ 295.600086] PM: resume devices took 10.180 seconds
    > [ 295.600091] ------------[ cut here ]------------
    > [ 295.600092] WARNING: at kernel/power/main.c:176
    > suspend_test_finish+0x70/0x80()
    > [ 295.600094] Modules linked in: i2c_i801 i2c_core nls_iso8859_1
    > nls_cp437 vfat fat isofs udf af_packet binfmt_misc ipv6 sco bnep
    > rfcomm l2cap bluetooth ipt_MASQUERADE iptable_nat nf_nat
    > nf_conntrack_ipv4 xt_state nf_conntrack ipt_REJECT xt_tcpudp bridge
    > stp llc kvm_intel kvm ppdev acpi_cpufreq cpufreq_conservative
    > cpufreq_ondemand cpufreq_stats freq_table cpufreq_userspace
    > cpufreq_powersave wmi video output pci_slot container battery
    > iptable_filter ip_tables x_tables ac firewire_sbp2 lp snd_hda_intel
    > snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss
    > snd_seq_midi serio_raw snd_rawmidi evdev dm_multipath psmouse pcspkr
    > scsi_dh snd_seq_midi_event snd_seq snd_timer snd_seq_device
    > appledisplay snd parport_serial parport_pc soundcore parport shpchp
    > snd_page_alloc pci_hotplug button iTCO_wdt iTCO_vendor_support
    > intel_agp sd_mod sr_mod crc_t10dif cdrom usb_storage usbhid libusual
    > hid sg firewire_ohci firewire_core crc_itu_t ahci libata scsi_mod dock
    > ehci_hcd uhci_hcd usbcore e1000e dm_mirror dm_log dm_snapshot dm_mod
    > thermal processor fan fuse
    > [ 295.600141] Pid: 7470, comm: pm-suspend Not tainted 2.6.27 #2
    > [ 295.600142]
    > [ 295.600142] Call Trace:
    > [ 295.600147] [<ffffffff802471ff>] warn_on_slowpath+0x5f/0x90
    > [ 295.600150] [<ffffffff804be7de>] ? printk+0x67/0x69
    > [ 295.600164] [<ffffffffa006fc10>] ? usb_autopm_do_device+0xc0/0x110 [usbcore]
    > [ 295.600166] [<ffffffff80377307>] ? kobject_put+0x27/0x60
    > [ 295.600169] [<ffffffff803f95c5>] ? put_device+0x15/0x20
    > [ 295.600172] [<ffffffff804017ba>] ? device_resume+0x39a/0x460
    > [ 295.600174] [<ffffffff802742e0>] suspend_test_finish+0x70/0x80
    > [ 295.600176] [<ffffffff802743d4>] suspend_devices_and_enter+0xe4/0x200
    > [ 295.600178] [<ffffffff80274666>] enter_state+0x146/0x1d0
    > [ 295.600180] [<ffffffff802747aa>] state_store+0xba/0x100
    > [ 295.600181] [<ffffffff803771c7>] kobj_attr_store+0x17/0x20
    > [ 295.600184] [<ffffffff80326475>] sysfs_write_file+0xc5/0x140
    > [ 295.600186] [<ffffffff802cd14b>] vfs_write+0xcb/0x190
    > [ 295.600188] [<ffffffff802cd300>] sys_write+0x50/0x90
    > [ 295.600191] [<ffffffff8021168a>] system_call_fastpath+0x16/0x1b
    > [ 295.600192]
    > [ 295.600193] ---[ end trace 8a154931a4b75ee4 ]---
    > [ 295.600333] PM: Finishing wakeup.
    >
    >




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