On Mon, Sep 23, 2019 at 7:45 PM Tony Lindgren <tony@xxxxxxxxxxx> wrote: > > * Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> [190821 01:24]: > > I'm moving our systems to the recent kernel and have encountered an > > older musb issue [1] that occurs with some 3G/4G modems. In this case > > it is SIMCom 7600G-H. After this dump occurs the modem is still > > working though. > > > > [ 45.585644] ------------[ cut here ]------------ > > [ 45.590785] WARNING: CPU: 0 PID: 242 at > > drivers/usb/musb/musb_host.c:115 musb_h_tx_flush_fifo+0x118/0x138 > > [ 45.600421] musb-hdrc musb-hdrc.0: Could not flush host TX2 fifo: csr: 2403 > > [ 45.607433] Modules linked in: 8021q garp stp mrp llc wl18xx wlcore > > mac80211 libarc4 sha256_generic cfg80211 wlcore_sdio c_can_platform > > omap_rng rng_core c_can can_dev at24 gpio_pca953x omap_wdt watchdog > > rtc_omap leds_gpio led_class > > [ 45.628258] CPU: 0 PID: 242 Comm: ModemManager Not tainted 5.3.0-rc5 #2 > > [ 45.634920] Hardware name: Generic AM33XX (Flattened Device Tree) > > [ 45.641092] [<c0111d28>] (unwind_backtrace) from [<c010d000>] > > (show_stack+0x10/0x14) > > [ 45.648910] [<c010d000>] (show_stack) from [<c09bd0f0>] > > (dump_stack+0xd8/0x110) > > [ 45.656291] [<c09bd0f0>] (dump_stack) from [<c013a034>] (__warn+0xe0/0x10c) > > [ 45.663314] [<c013a034>] (__warn) from [<c013a0a4>] > > (warn_slowpath_fmt+0x44/0x6c) > > [ 45.670862] [<c013a0a4>] (warn_slowpath_fmt) from [<c076fbf0>] > > (musb_h_tx_flush_fifo+0x118/0x138) > > [ 45.679806] [<c076fbf0>] (musb_h_tx_flush_fifo) from [<c0770ef4>] > > (musb_cleanup_urb+0x128/0x204) > > [ 45.688660] [<c0770ef4>] (musb_cleanup_urb) from [<c077167c>] > > (musb_urb_dequeue+0x14c/0x234) > > [ 45.697165] [<c077167c>] (musb_urb_dequeue) from [<c07323fc>] > > (usb_hcd_unlink_urb+0x68/0x84) > > [ 45.705667] [<c07323fc>] (usb_hcd_unlink_urb) from [<c0768530>] > > (usb_wwan_write+0x64/0x1f0) > > [ 45.714090] [<c0768530>] (usb_wwan_write) from [<c075b600>] > > (serial_write+0x34/0x60) > > [ 45.721898] [<c075b600>] (serial_write) from [<c060e3ec>] > > (n_tty_write+0x360/0x460) > > [ 45.729626] [<c060e3ec>] (n_tty_write) from [<c060a1bc>] > > (tty_write+0x1c0/0x36c) > > [ 45.737092] [<c060a1bc>] (tty_write) from [<c02f0410>] > > (__vfs_write+0x28/0x1c4) > > [ 45.744465] [<c02f0410>] (__vfs_write) from [<c02f2f48>] > > (vfs_write+0xa0/0x184) > > [ 45.751835] [<c02f2f48>] (vfs_write) from [<c02f31e8>] (ksys_write+0x98/0xdc) > > [ 45.759033] [<c02f31e8>] (ksys_write) from [<c0101000>] > > (ret_fast_syscall+0x0/0x28) > > [ 45.766743] Exception stack(0xcb911fa8 to 0xcb911ff0) > > [ 45.771845] 1fa0: 00160170 bea0fc14 00000009 > > 00141be9 00000001 bea0fc14 > > [ 45.780086] 1fc0: 00160170 bea0fc14 00000000 00000004 00141be9 > > 00000001 00000001 00141be9 > > [ 45.788322] 1fe0: 00000000 bea0fbc8 b68d992b b68d9934 > > [ 45.793416] irq event stamp: 109442 > > [ 45.796945] hardirqs last enabled at (109441): [<c0101a74>] > > __irq_svc+0x74/0x98 > > [ 45.804406] hardirqs last disabled at (109442): [<c09dd3e8>] > > _raw_spin_lock_irqsave+0x1c/0x4c > > [ 45.812992] softirqs last enabled at (109180): [<c0102580>] > > __do_softirq+0x360/0x524 > > [ 45.820880] softirqs last disabled at (109157): [<c0141c28>] > > irq_exit+0x12c/0x17c > > [ 45.828416] ---[ end trace eecf6f3aa6209643 ]--- > > > > [1] https://patchwork.kernel.org/patch/7389591/ > > Hmm so is this with am335x SoC glue or something else? I've found the following comment in drivers/usb/musb/musb_host.c [1]: /* * FIXME: sometimes the tx fifo flush failed, it has been * observed during device disconnect on AM335x. * * To reproduce the issue, ensure tx urb(s) are queued when * unplug the usb device which is connected to AM335x usb * host port. * * I found using a usb-ethernet device and running iperf * (client on AM335x) has very high chance to trigger it. * * Better to turn on musb_dbg() in musb_cleanup_urb() with * CPPI enabled to see the issue when aborting the tx channel. */ So the issue is already known but so far unresolved :-( [1] https://github.com/torvalds/linux/blob/master/drivers/usb/musb/musb_host.c#L100 Regards, Yegor
