Le mardi 07 novembre 2017 à 11:13 +0100, Stanislaw Gruszka a écrit : > On Tue, Nov 07, 2017 at 11:06:39AM +0100, Richard Genoud wrote: > > > 3 short articles how to configure and use ftrace are here: > > > https://lwn.net/Articles/365835/ > > > https://lwn.net/Articles/366796/ > > > https://lwn.net/Articles/370423/ > > > > > > > I tried with ftrace, but I don't think there's a way to dump the > > trace > > when there's a soft lock-up > > (I can't do anything after the unbind, even the heartbeat led > > stopped blinking). > > I saw the /proc/sys/kernel/ftrace_dump_on_oops file, but there's no > > /proc/sys/kernel/ftrace_dump_on_soft_lock-up file :) > > You should configure function trace with rt2x* functions. After that > start tracing, unbind the device, then stop tracing and provide trace > output. Here is another trace, with rt2* as function filter. (sorry for the noise) Dumping ftrace buffer: --------------------------------- CPU:0 [LOST 3606923 EVENTS] 0) 0.000 us | } /* rt2x00usb_clear_entry */ 0) 0.000 us | } /* rt2x00lib_rxdone */ 0) 0.000 us | rt2x00queue_get_entry(); 0) | rt2x00lib_rxdone() { 0) 0.000 us | rt2x00queue_index_inc(); 0) | rt2x00usb_clear_entry() { 0) | rt2x00usb_kick_rx_entry() { 0) | rt2x00lib_dmastart() { 0) 0.000 us | rt2x00queue_index_inc(); 0) 0.000 us | } 0) | rt2x00lib_dmadone() { 0) 0.000 us | rt2x00queue_index_inc(); 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | rt2x00queue_get_entry(); 0) | rt2x00lib_rxdone() { 0) 0.000 us | rt2x00queue_index_inc(); 0) | rt2x00usb_clear_entry() { 0) | rt2x00usb_kick_rx_entry() { 0) | rt2x00lib_dmastart() { 0) 0.000 us | rt2x00queue_index_inc(); 0) 0.000 us | } 0) | rt2x00lib_dmadone() { 0) 0.000 us | rt2x00queue_index_inc(); 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | rt2x00queue_get_entry(); 0) | rt2x00lib_rxdone() { 0) 0.000 us | rt2x00queue_index_inc(); 0) | rt2x00usb_clear_entry() { 0) | rt2x00usb_kick_rx_entry() { 0) | rt2x00lib_dmastart() { 0) 0.000 us | rt2x00queue_index_inc(); 0) 0.000 us | } 0) | rt2x00lib_dmadone() { 0) 0.000 us | rt2x00queue_index_inc(); 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | } 0) 0.000 us | } > > Thanks > Stanislaw
