Hi Bin, Using next-20160302 I can very reliably hit this warning on an AM335x BeagleBone by playing a short audio file over USB-Audio: $ aplay -Dplughw:1,0 -r 44100 -c 2 -f S16_LE /usr/share/sounds/alsa/Front_Center.wav $ aplay -l **** List of PLAYBACK Hardware Devices **** card 1: Audio [USB Audio], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 The audio file is part of the alsa-utils package. The USB-Audio device is never disconnected. Simply playing the file triggers the warning. Any hints/suggestions how I should debug this? Here is the dmesg output: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at /linux/drivers/usb/musb/musb_host.c:139 musb_h_tx_flush_fifo+0xd4/0xf8 [musb_hdrc] musb-hdrc musb-hdrc.1.auto: Could not flush host TX10 fifo: csr: 2403 Modules linked in: musb_am335x musb_dsps musb_hdrc snd_usb_audio snd_hwdep snd_usbmidi_lib snd_rawmidi CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc6-next-20160302 #75 Hardware name: Generic AM33XX (Flattened Device Tree) Backtrace: [<c010b0ec>] (dump_backtrace) from [<c010b288>] (show_stack+0x18/0x1c) r6:00000000 r5:00000000 r4:60010193 r3:00000000 [<c010b270>] (show_stack) from [<c03c8198>] (dump_stack+0x94/0xb4) [<c03c8104>] (dump_stack) from [<c0135cd0>] (__warn+0xd8/0x104) r6:bf050428 r5:00000000 r4:c0c01a98 r3:00000000 [<c0135bf8>] (__warn) from [<c0135db4>] (warn_slowpath_fmt+0x40/0x48) r10:ca08a010 r8:ca08ab80 r7:bf0510cc r6:d104cc10 r5:bf050ef0 r4:00002403 [<c0135d78>] (warn_slowpath_fmt) from [<bf04713c>] (musb_h_tx_flush_fifo+0xd4/0xf8 [musb_hdrc]) r3:bf04f9ac r2:bf050460 [<bf047068>] (musb_h_tx_flush_fifo [musb_hdrc]) from [<bf048570>] (musb_cleanup_urb+0xc8/0x144 [musb_hdrc]) r10:d104cc10 r9:bf0510cc r8:00000000 r7:00000000 r6:ca0896d4 r5:cf4d8f00 r4:ca08ab80 [<bf0484a8>] (musb_cleanup_urb [musb_hdrc]) from [<bf0488ec>] (musb_urb_dequeue+0xf4/0x12c [musb_hdrc]) r10:00008200 r9:00000001 r8:a0010193 r7:00000000 r6:ca08a010 r5:ca080f80 r4:cf4d8f00 [<bf0487f8>] (musb_urb_dequeue [musb_hdrc]) from [<c05c8620>] (unlink1+0x34/0x118) r10:000013e8 r9:00002e6c r8:ca0873ec r7:ffffff98 r6:cf6ff000 r5:cf4d8f00 r4:cf4d8f00 r3:bf0487f8 [<c05c85ec>] (unlink1) from [<c05c9f68>] (usb_hcd_unlink_urb+0x58/0x8c) r8:ca0873ec r7:ffffff98 r6:a0010193 r5:cf545000 r4:cf4d8f00 r3:cf545000 [<c05c9f10>] (usb_hcd_unlink_urb) from [<c05ca958>] (usb_unlink_urb+0x34/0x50) r7:ca086000 r6:ca0873f0 r5:ca086000 r4:00000000 [<c05ca924>] (usb_unlink_urb) from [<bf01aa14>] (deactivate_urbs+0xd4/0xf4 [snd_usb_audio]) [<bf01a940>] (deactivate_urbs [snd_usb_audio]) from [<bf01bd40>] (snd_usb_endpoint_stop+0x38/0x70 [snd_usb_audio]) r10:5dc00000 r8:cf471000 r7:00000000 r6:00000000 r5:00000000 r4:ca086000 [<bf01bd08>] (snd_usb_endpoint_stop [snd_usb_audio]) from [<bf024cc8>] (stop_endpoints+0x64/0x7c [snd_usb_audio]) r5:cf4f6674 r4:cf4f6610 [<bf024c64>] (stop_endpoints [snd_usb_audio]) from [<bf024e30>] (snd_usb_substream_playback_trigger+0x9c/0xc0 [snd_usb_audio]) r6:00000001 r5:cf4f6200 r4:cf4f6610 r3:cf4fe000 [<bf024d94>] (snd_usb_substream_playback_trigger [snd_usb_audio]) from [<c069ad4c>] (snd_pcm_do_stop+0x5c/0x60) r4:c0876b34 r3:bf024d94 [<c069acf0>] (snd_pcm_do_stop) from [<c069aa98>] (snd_pcm_action_single+0x40/0x80) [<c069aa58>] (snd_pcm_action_single) from [<c069e3c0>] (snd_pcm_drain_done+0x1c/0x24) r7:cf4f6200 r6:00011940 r5:00005dc0 r4:00004650 [<c069e3a4>] (snd_pcm_drain_done) from [<c06a1b0c>] (snd_pcm_update_state+0xd8/0x108) [<c06a1a34>] (snd_pcm_update_state) from [<c06a1cf8>] (snd_pcm_update_hw_ptr0+0x1bc/0x3d8) r5:00011940 r4:cf4fe000 [<c06a1b3c>] (snd_pcm_update_hw_ptr0) from [<c06a1f90>] (snd_pcm_period_elapsed+0x7c/0xbc) r10:000003c0 r9:00000004 r8:ca086000 r7:00000120 r6:60010193 r5:cf4fe000 r4:cf4f6200 [<c06a1f14>] (snd_pcm_period_elapsed) from [<bf0244b8>] (prepare_playback_urb+0x2ac/0x578 [snd_usb_audio]) r6:cf5ad900 r5:cf5ad940 r4:cf4f6610 r3:00000000 [<bf02420c>] (prepare_playback_urb [snd_usb_audio]) from [<bf01acec>] (prepare_outbound_urb+0x4c/0x224 [snd_usb_audio]) r10:c0c82800 r9:00000000 r8:bf02420c r7:ca086000 r6:cf5ad900 r5:ca0861e8 r4:ca086000 [<bf01aca0>] (prepare_outbound_urb [snd_usb_audio]) from [<bf01c1c8>] (snd_complete_urb+0x108/0x26c [snd_usb_audio]) r10:c0c82800 r9:00000000 r8:cf6ff0dc r7:00000000 r6:cf5ad900 r5:ca0861e8 r4:ca086000 [<bf01c0c0>] (snd_complete_urb [snd_usb_audio]) from [<c05c8364>] (__usb_hcd_giveback_urb+0x74/0x110) r7:00000000 r6:00000000 r5:60010113 r4:cf5ad900 [<c05c82f0>] (__usb_hcd_giveback_urb) from [<c05c84a4>] (usb_giveback_urb_bh+0xa4/0xf4 r7:cf6ff0e0 r6:cf6ff0e4 r5:00000000 r4:c0c01e18 [<c05c8400>] (usb_giveback_urb_bh) from [<c0139160>] (tasklet_hi_action+0x8c/0x138) r8:c0b64348 r7:c0c02b14 r6:00000000 r5:cf6ff0f0 r4:cf6ff0ec [<c01390d4>] (tasklet_hi_action) from [<c01396f0>] (__do_softirq+0xec/0x240) r10:c0c02080 r9:00000000 r8:00000100 r7:c0c02080 r6:00000000 r5:c0c02080 r4:00000000 r3:c01390d4 [<c0139604>] (__do_softirq) from [<c0139af8>] (irq_exit+0xa8/0x120) r10:cf004000 r9:c0c029e0 r8:00000044 r7:00000000 r6:00000000 r5:c0b6756c r4:c0c02b14 [<c0139a50>] (irq_exit) from [<c0176bd8>] (__handle_domain_irq+0x78/0xe4) r4:c0c02b14 r3:c017a968 [<c0176b60>] (__handle_domain_irq) from [<c0101448>] (omap_intc_handle_irq+0x38/0x98) r10:c0c029d8 r8:c0b68638 r7:c0c01f4c r6:ffffffff r5:60010013 r4:c0cb00c0 [<c0101410>] (omap_intc_handle_irq) from [<c07a9934>] (__irq_svc+0x54/0x70) Exception stack(0xc0c01f18 to 0xc0c01f60) 1f00: 00000001 00000000 1f20: c0c01f78 c0119e00 00000000 c0c0298c 00000000 00000000 c0b68638 c0c029e0 1f40: c0c029d8 c0c01f74 c0c01f78 c0c01f68 c0108834 c0108838 60010013 ffffffff r4:c0108838 r3:c0108834 [<c0108800>] (arch_cpu_idle) from [<c016d0f0>] (default_idle_call+0x28/0x34) [<c016d0c8>] (default_idle_call) from [<c016d2fc>] (cpu_startup_entry+0x200/0x2a8) [<c016d0fc>] (cpu_startup_entry) from [<c07a3d94>] (rest_init+0x6c/0x84) r7:c0b49a30 [<c07a3d28>] (rest_init) from [<c0b00cf4>] (start_kernel+0x370/0x3f4) [<c0b00984>] (start_kernel) from [<8000807c>] (0x8000807c) ---[ end trace f418467955b3060c ]--- John Ognes -- 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
