lkml.org 
[lkml]   [2009]   [Oct]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    SubjectRe: [PATCH] USB: ftdi_sio: Remove tty->low_latency.
    Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

    >> As it stands today ftdi_sio does indeed call tty_flip_buffer_push from
    >> interrupt context with low_latency set and that is obviously incorrect,
    >> right?
    >
    > It seems to do it from a work queue - or did I miss a case ?

    ftdi_sio crash quite regularly for me with 2.6.31.

    With a bunch of nasties like:
    BUG: scheduling while atomic: swapper/0/0x00010000
    bad: scheduling from the idle thread!

    I don't know if I have a good backtrace as things
    scrolled away faster than they were captured
    but the code below looks like it may be.

    Eric

    BUG: scheduling while atomic: swapper/0/0x00010000
    Modules linked in: nfsd lockd nfs_acl auth_rpcgss exportfs sco bridge stp bnep l2cap bluetooth sunrpc ipv6 cpufreq_ondemand powernow_k8 freq_table dm_mirror dm_region_hash dm_log dm_multipath dm_mod uinput kvm_amd kvm fuse xt_multiport iptable_nat ip_tables nf_nat x_tables nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 tun 8021q snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd amd64_edac_mod firewire_ohci firewire_core soundcore i2c_nforce2 k8temp sg edac_core hwmon pcspkr sata_sil24 pata_amd snd_page_alloc e1000e forcedeth crc_itu_t i2c_core ftdi_sio usbserial ata_generic pata_acpi sata_nv libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan]
    CPU 0:
    Modules linked in: nfsd lockd nfs_acl auth_rpcgss exportfs sco bridge stp bnep l2cap bluetooth sunrpc ipv6 cpufreq_ondemand powernow_k8 freq_table dm_mirror dm_region_hash dm_log dm_multipath dm_mod uinput kvm_amd kvm fuse xt_multiport iptable_nat ip_tables nf_nat x_tables nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 tun 8021q snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd amd64_edac_mod firewire_ohci firewire_core soundcore i2c_nforce2 k8temp sg edac_core hwmon pcspkr sata_sil24 pata_amd snd_page_alloc e1000e forcedeth crc_itu_t i2c_core ftdi_sio usbserial ata_generic pata_acpi sata_nv libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan]
    Pid: 0, comm: swapper Not tainted 2.6.31-185494.2008.AroraEbiederm.fc11.x86_64 #1
    RIP: 0010:[<ffffffff8102c86c>] [<ffffffff8102c86c>] native_safe_halt+0x6/0x8
    RSP: 0018:ffffffff81541e48 EFLAGS: 00000246
    RAX: 0000000000000000 RBX: ffffffff81541e48 RCX: 0000000003000000
    RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff81541e58
    RBP: ffffffff8100c7ce R08: 0000000000000000 R09: 0000000000000000
    R10: 0000000000000000 R11: ffff880038d0fef8 R12: ffffffff81073a1f
    R13: ffffffff81541dd8 R14: ffffffff8105c8d7 R15: ffffffff81541e38
    FS: 00007fe289d71910(0000) GS:ffff8800017ba000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    CR2: 0000000000404070 CR3: 000000003b87d000 CR4: 00000000000006f0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Call Trace:
    [<ffffffff81014126>] ? default_idle+0x51/0x8b
    [<ffffffff81014265>] ? c1e_idle+0x105/0x120
    [<ffffffff8100ae15>] ? cpu_idle+0xb0/0xf3
    [<ffffffff81392135>] ? rest_init+0x79/0x8f
    [<ffffffff815c8fae>] ? start_kernel+0x3dc/0x3fd
    [<ffffffff815c82d4>] ? x86_64_start_reservations+0xbb/0xd6
    [<ffffffff815c83f4>] ? x86_64_start_kernel+0x105/0x128
    bad: scheduling from the idle thread!
    Pid: 0, comm: swapper Not tainted 2.6.31-185494.2008.AroraEbiederm.fc11.x86_64 #1
    Call Trace:
    <IRQ> [<ffffffff81041261>] dequeue_task_idle+0x37/0x5a
    [<ffffffff81040a23>] dequeue_task+0xce/0xf0
    [<ffffffff81040a7c>] deactivate_task+0x37/0x56
    [<ffffffff813a4fb7>] schedule+0x13d/0x6f3
    [<ffffffff81042b82>] ? enqueue_task_fair+0xdf/0x13c
    [<ffffffff810404df>] ? enqueue_task+0x6f/0x91
    [<ffffffff813a5e87>] __mutex_lock_common+0x12f/0x1aa
    [<ffffffff813a5f29>] __mutex_lock_slowpath+0x27/0x3d
    [<ffffffff813a5c3d>] mutex_lock+0x25/0x53
    [<ffffffff81253ff9>] tty_unthrottle+0x29/0x6d
    [<ffffffff8125298a>] reset_buffer_flags+0xe8/0x105
    [<ffffffff812529cb>] n_tty_flush_buffer+0x24/0x97
    [<ffffffff8125367b>] n_tty_receive_buf+0xc3d/0xe72
    [<ffffffff8129b0fd>] ? usb_hcd_submit_urb+0x888/0x943
    [<ffffffff81254e83>] ? tty_ldisc_try+0x53/0x71
    [<ffffffff81255f85>] flush_to_ldisc+0x116/0x1bd
    [<ffffffff8125608a>] tty_flip_buffer_push+0x5e/0x85
    [<ffffffffa010a0ab>] ftdi_process_read+0x481/0x627 [ftdi_sio]
    [<ffffffffa0001aea>] ? timer_action+0x63/0x79 [ehci_hcd]
    [<ffffffffa010a480>] ftdi_read_bulk_callback+0x22f/0x25a [ftdi_sio]
    [<ffffffff81040e89>] ? complete+0x54/0x73
    [<ffffffffa000597f>] ? ehci_irq+0x351/0x391 [ehci_hcd]
    [<ffffffff81299a32>] usb_hcd_giveback_urb+0x9b/0xe5
    [<ffffffffa00010f9>] ehci_urb_done+0x91/0xbc [ehci_hcd]
    [<ffffffffa00027f3>] qh_completions+0x42a/0x4ca [ehci_hcd]
    [<ffffffffa0002938>] ehci_work+0xa5/0x7ab [ehci_hcd]
    [<ffffffffa00db90f>] ? nv_swncq_interrupt+0x6a3/0x6d1 [sata_nv]
    [<ffffffffa000597f>] ehci_irq+0x351/0x391 [ehci_hcd]
    [<ffffffff81073641>] ? clocksource_read+0x1d/0x33
    [<ffffffff81073a1f>] ? getnstimeofday+0x69/0xd3
    [<ffffffff8129933c>] usb_hcd_irq+0x4d/0xa1
    [<ffffffff810a2553>] handle_IRQ_event+0x6a/0x13f
    [<ffffffff810a4613>] handle_fasteoi_irq+0x90/0xe1
    [<ffffffff8100eb5a>] handle_irq+0x95/0xb7
    [<ffffffff8100df49>] do_IRQ+0x6a/0xe0
    [<ffffffff8100c7d3>] ret_from_intr+0x0/0x11
    <EOI> [<ffffffff8102c86c>] ? native_safe_halt+0x6/0x8
    [<ffffffff81014126>] ? default_idle+0x51/0x8b
    [<ffffffff81014265>] ? c1e_idle+0x105/0x120
    [<ffffffff8100ae15>] ? cpu_idle+0xb0/0xf3
    [<ffffffff81392135>] ? rest_init+0x79/0x8f
    [<ffffffff815c8fae>] ? start_kernel+0x3dc/0x3fd
    [<ffffffff815c82d4>] ? x86_64_start_reservations+0xbb/0xd6
    [<ffffffff815c83f4>] ? x86_64_start_kernel+0x105/0x128
    BUG: scheduling while atomic: swapper/0/0x00010000



    \
     
     \ /
      Last update: 2009-10-02 04:55    [W:0.046 / U:62.780 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site