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List:       freebsd-stable
Subject:    Re: Help debugging stable/10
From:       Andriy Gapon <avg () FreeBSD ! org>
Date:       2014-12-25 12:33:49
Message-ID: 549C042D.3090108 () FreeBSD ! org
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On 25/12/2014 11:29, Hans Petter Selasky wrote:
> The cam_sim_free() is stuck, blocking the rest of that controller from
> enumerating. It might look like a non-USB stack issue.
> 
> MAV: Do you have some ideas where to start looking, now we have a dump? Any
> refcounts to check in particular?

Apparently sim->refcount > 0.
Not sure how to check who has the reference(s).

>> Thread 254 (Thread 100039):
>> #0  sched_switch (td=0xfffff8000669e000, newtd=<value optimized out>,
>> flags=<value optimized out>)
>>     at /usr/src/sys/kern/sched_ule.c:1945
>> #1  0xffffffff809350b1 in mi_switch (flags=260, newtd=0x0) at
>> /usr/src/sys/kern/kern_synch.c:493
>> #2  0xffffffff80972a2a in sleepq_wait (wchan=0x0, pri=0) at
>> /usr/src/sys/kern/subr_sleepqueue.c:617
>> #3  0xffffffff80934ad7 in _sleep (ident=<value optimized out>, lock=<value
>> optimized out>,
>>     priority=<value optimized out>, wmesg=<value optimized out>, sbt=<value
>> optimized out>, pr=<value optimized out>,
>>     flags=<value optimized out>) at /usr/src/sys/kern/kern_synch.c:255
>> #4  0xffffffff802df838 in cam_sim_free (sim=0xfffff801f5ee8900, free_devq=1)
>> at /usr/src/sys/cam/cam_sim.c:109
>> #5  0xffffffff807a5549 in umass_detach (dev=<value optimized out>) at
>> /usr/src/sys/dev/usb/storage/umass.c:2139
>> #6  0xffffffff8095d042 in device_detach (dev=0xfffff8018b028900) at
>> device_if.h:214
>> #7  0xffffffff807b23b1 in usb_detach_device (udev=0xfffff801ea710000,
>> iface_index=<value optimized out>, flag=0 '\0')
>>     at /usr/src/sys/dev/usb/usb_device.c:1148
>> #8  0xffffffff807b14d6 in usb_unconfigure (udev=0xfffff801ea710000, flag=2
>> '\002')
>>     at /usr/src/sys/dev/usb/usb_device.c:537
>> #9  0xffffffff807b4466 in usb_free_device (udev=0xfffff801ea710000,
>> flag=<value optimized out>)
>>     at /usr/src/sys/dev/usb/usb_device.c:2175
>> #10 0xffffffff807bda6f in uhub_explore (udev=0xfffff8000d6c4000) at
>> /usr/src/sys/dev/usb/usb_hub.c:647
>> #11 0xffffffff807be0d9 in uhub_explore (udev=0xfffff8000d07d000) at
>> /usr/src/sys/dev/usb/usb_hub.c:574
>> #12 0xffffffff807a42c0 in usb_bus_explore (pm=<value optimized out>)
>>     at /usr/src/sys/dev/usb/controller/usb_controller.c:406
>> #13 0xffffffff807c05af in usb_process (arg=0xfffffe0000ac4db0) at
>> /usr/src/sys/dev/usb/usb_process.c:177
>> #14 0xffffffff808fc66a in fork_exit (callout=0xffffffff807c0490 <usb_process>,
>> arg=0xfffffe0000ac4db0,
>> ---Type <return> to continue, or q <return> to quit---
>>     frame=0xfffffe0212f7aac0) at /usr/src/sys/kern/kern_fork.c:996
>> #15 0xffffffff80d10eee in fork_trampoline () at
>> /usr/src/sys/amd64/amd64/exception.S:611
>> #16 0x0000000000000000 in ?? ()
> 
> 
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> 


-- 
Andriy Gapon
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