Benjamin Close
2012-Sep-10 13:39 UTC
usb port issue in 9.1-Prerelease (Possibly Cam related)
Hi Folks,
I've facing an intermittent hang with a USB port which seems cam
related:
Event's that happen are:
o USB modem (HUAWEI E220) plugged into PC
ugen3.2: <HUA WEI> at usbus3
u3g0: <3G Modem> on usbus3
u3g0: Found 3 ports.
umass0: <USB MASS STORAGE> on usbus3
umass0: SCSI over Bulk-Only; quirks = 0x0000
umass0:6:0:-1: Attached to scbus6
umass1: <USB MASS STORAGE> on usbus3
umass1: SCSI over Bulk-Only; quirks = 0x0000
umass1:7:1:-1: Attached to scbus7
cd1 at umass-sim0 bus 0 scbus6 target 0 lun 0
cd1: <HUAWEI Mass Storage 2.31> Removable CD-ROM SCSI-2 device
cd1: 1.000MB/s transfers
cd1: Attempt to query device size failed: NOT READY, Medium not present
da0 at umass-sim1 bus 1 scbus7 target 0 lun 0
da0: <HUAWEI SD Storage 2.31> Removable Direct Access SCSI-2 device
da0: 1.000MB/s transfers
da0: Attempt to query device size failed: NOT READY, Medium not present
o Time Elapses....many packets passed, no da0 or cd1 used.
o USB Modem drops off the bus
(It does this occasionally as it resets itself)
o Causes USB bus to lose devices
ugen3.2: <HUA WEI> at usbus3 (disconnected)
u3g0: at uhub3, port 1, addr 2 (disconnected)
(cd1:umass-sim0:0:0:0): lost device, 1 refs
(cd1:umass-sim0:0:0:0): removing device entry
(pass4:umass-sim0:0:0:0): passdevgonecb: devfs entry is gone
(da0:umass-sim1:1:0:0): lost device - 0 outstanding, 1 refs
(da0:umass-sim1:1:0:0): removing device entry
(pass5:umass-sim1:1:0:0): passdevgonecb: devfs entry is gone
umass0: at uhub3, port 1, addr 2 (disconnected)
At this point that particular USB port is effectively useless. Plugging
anything into the ports shows no device showing up.
Running usbconfig hangs with:
PID TID COMM TDNAME KSTACK
48562 101874 usbconfig - mi_switch+0x186
sleepq_wait+0x42 _sx_xlock_hard+0x426 usbd_enum_lock+0xac
usb_ref_device+0x21c usb_open+0xc7 devfs_open+0x197 vn_open_cred+0x2ff
kern_openat+0x20a amd64_syscall+0x540 Xfast_syscall+0xf7
Controller is:
uhci0@pci0:0:26:0: class=0x0c0300 card=0x02091028 chip=0x28348086
rev=0x02 hdr=0x00
vendor = 'Intel Corporation'
device = '82801H (ICH8 Family) USB UHCI Controller'
class = serial bus
subclass = USB
uhci1@pci0:0:26:1: class=0x0c0300 card=0x02091028 chip=0x28358086
rev=0x02 hdr=0x00
vendor = 'Intel Corporation'
device = '82801H (ICH8 Family) USB UHCI Controller'
class = serial bus
subclass = USB
ehci0@pci0:0:26:7: class=0x0c0320 card=0x02091028 chip=0x283a8086
rev=0x02 hdr=0x00
vendor = 'Intel Corporation'
device = '82801H (ICH8 Family) USB2 EHCI Controller'
class = serial bus
subclass = USB
It does however seem related to cam as looking at the various threads
for the usb hub I find:
(kgdb) bt
#0 sched_switch (td=0xfffffe0002650000, newtd=0xfffffe000227f000,
flags=Variable "flags" is not available.
) at /usr/src/sys/kern/sched_ule.c:1927
#1 0xffffffff808f34c6 in mi_switch (flags=260, newtd=0x0) at
/usr/src/sys/kern/kern_synch.c:485
#2 0xffffffff8092bfd2 in sleepq_wait (wchan=0xfffffe001ec2a900, pri=92)
at /usr/src/sys/kern/subr_sleepqueue.c:623
#3 0xffffffff808f3c69 in _sleep (ident=0xfffffe001ec2a900,
lock=0xfffffe00371e9210, priority=Variable "priority" is not
available.
) at /usr/src/sys/kern/kern_synch.c:250
#4 0xffffffff802bea02 in cam_sim_free (sim=0xfffffe001ec2a900,
free_devq=1) at /usr/src/sys/cam/cam_sim.c:112
#5 0xffffffff8074f8ba in umass_detach (dev=Variable "dev" is not
available.
) at /usr/src/sys/dev/usb/storage/umass.c:2183
#6 0xffffffff8091a054 in device_detach (dev=0xfffffe001ec2e900) at
device_if.h:214
#7 0xffffffff8075c458 in usb_detach_device (udev=0xfffffe0007ce8800,
iface_index=32 ' ', flag=Variable "flag" is not available.
) at /usr/src/sys/dev/usb/usb_device.c:1065
#8 0xffffffff8075c5f4 in usb_unconfigure (udev=0xfffffe0007ce8800,
flag=Variable "flag" is not available.
) at /usr/src/sys/dev/usb/usb_device.c:455
#9 0xffffffff8075c88e in usb_free_device (udev=0xfffffe0007ce8800,
flag=Variable "flag" is not available.
) at /usr/src/sys/dev/usb/usb_device.c:2093
#10 0xffffffff80764e5e in uhub_explore (udev=0xfffffe0007353800) at
/usr/src/sys/dev/usb/usb_hub.c:358
#11 0xffffffff8074f536 in usb_bus_explore (pm=Variable "pm" is not
available.
) at /usr/src/sys/dev/usb/controller/usb_controller.c:359
#12 0xffffffff80769173 in usb_process (arg=Variable "arg" is not
available.
) at /usr/src/sys/dev/usb/usb_process.c:170
#13 0xffffffff808bc2df in fork_exit (callout=0xffffffff807690a0
<usb_process>, arg=0xffffff80007c0e88, frame=0xffffff804743cc40) at
/usr/src/sys/kern/kern_fork.c:992
#14 0xffffffff80bc216e in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:602
From: cam_sim_free(struct cam_sim *sim, int free_devq)
(kgdb) l
107 {
108 int error;
109
110 sim->refcount--;
111 if (sim->refcount > 0) {
112 error = msleep(sim, sim->mtx, PRIBIO,
"simfree", 0);
113 KASSERT(error == 0, ("invalid error value for
msleep(9)"));
114 }
115
116 KASSERT(sim->refcount == 0, ("sim->refcount ==
0"));
It almost appears as if the cam layer is trying to finalise a write of
some sort but the physical device has already gone.
(kgdb) p sim->refcount
$1 = 1
Not sure why refcount is still ==1.
The same device in a box running 9.0-Stable (as of about 3 months ago)
with a ICH9 controller works as expected.
Any suggestions?
Cheers,
Benjamin
Kenneth D. Merry
2012-Oct-08 15:36 UTC
usb port issue in 9.1-Prerelease (Possibly Cam related)
On Mon, Sep 10, 2012 at 23:09:04 +0930, Benjamin Close wrote:> Hi Folks, > I've facing an intermittent hang with a USB port which seems cam > related: > > Event's that happen are: > > o USB modem (HUAWEI E220) plugged into PC > > ugen3.2: <HUA WEI> at usbus3 > u3g0: <3G Modem> on usbus3 > u3g0: Found 3 ports. > umass0: <USB MASS STORAGE> on usbus3 > umass0: SCSI over Bulk-Only; quirks = 0x0000 > umass0:6:0:-1: Attached to scbus6 > umass1: <USB MASS STORAGE> on usbus3 > umass1: SCSI over Bulk-Only; quirks = 0x0000 > umass1:7:1:-1: Attached to scbus7 > cd1 at umass-sim0 bus 0 scbus6 target 0 lun 0 > cd1: <HUAWEI Mass Storage 2.31> Removable CD-ROM SCSI-2 device > cd1: 1.000MB/s transfers > cd1: Attempt to query device size failed: NOT READY, Medium not present > da0 at umass-sim1 bus 1 scbus7 target 0 lun 0 > da0: <HUAWEI SD Storage 2.31> Removable Direct Access SCSI-2 device > da0: 1.000MB/s transfers > da0: Attempt to query device size failed: NOT READY, Medium not present > > > o Time Elapses....many packets passed, no da0 or cd1 used. > > > o USB Modem drops off the bus > (It does this occasionally as it resets itself) > > o Causes USB bus to lose devices > > ugen3.2: <HUA WEI> at usbus3 (disconnected) > u3g0: at uhub3, port 1, addr 2 (disconnected) > (cd1:umass-sim0:0:0:0): lost device, 1 refs > (cd1:umass-sim0:0:0:0): removing device entry > (pass4:umass-sim0:0:0:0): passdevgonecb: devfs entry is gone > (da0:umass-sim1:1:0:0): lost device - 0 outstanding, 1 refs > (da0:umass-sim1:1:0:0): removing device entry > (pass5:umass-sim1:1:0:0): passdevgonecb: devfs entry is gone > umass0: at uhub3, port 1, addr 2 (disconnected) > > > At this point that particular USB port is effectively useless. Plugging > anything into the ports shows no device showing up. > > Running usbconfig hangs with: > > PID TID COMM TDNAME KSTACK > 48562 101874 usbconfig - mi_switch+0x186 > sleepq_wait+0x42 _sx_xlock_hard+0x426 usbd_enum_lock+0xac > usb_ref_device+0x21c usb_open+0xc7 devfs_open+0x197 vn_open_cred+0x2ff > kern_openat+0x20a amd64_syscall+0x540 Xfast_syscall+0xf7 > > Controller is: > > uhci0@pci0:0:26:0: class=0x0c0300 card=0x02091028 chip=0x28348086 > rev=0x02 hdr=0x00 > vendor = 'Intel Corporation' > device = '82801H (ICH8 Family) USB UHCI Controller' > class = serial bus > subclass = USB > uhci1@pci0:0:26:1: class=0x0c0300 card=0x02091028 chip=0x28358086 > rev=0x02 hdr=0x00 > vendor = 'Intel Corporation' > device = '82801H (ICH8 Family) USB UHCI Controller' > class = serial bus > subclass = USB > ehci0@pci0:0:26:7: class=0x0c0320 card=0x02091028 chip=0x283a8086 > rev=0x02 hdr=0x00 > vendor = 'Intel Corporation' > device = '82801H (ICH8 Family) USB2 EHCI Controller' > class = serial bus > subclass = USB > > It does however seem related to cam as looking at the various threads > for the usb hub I find: > > (kgdb) bt > #0 sched_switch (td=0xfffffe0002650000, newtd=0xfffffe000227f000, > flags=Variable "flags" is not available. > ) at /usr/src/sys/kern/sched_ule.c:1927 > #1 0xffffffff808f34c6 in mi_switch (flags=260, newtd=0x0) at > /usr/src/sys/kern/kern_synch.c:485 > #2 0xffffffff8092bfd2 in sleepq_wait (wchan=0xfffffe001ec2a900, pri=92) > at /usr/src/sys/kern/subr_sleepqueue.c:623 > #3 0xffffffff808f3c69 in _sleep (ident=0xfffffe001ec2a900, > lock=0xfffffe00371e9210, priority=Variable "priority" is not available. > ) at /usr/src/sys/kern/kern_synch.c:250 > #4 0xffffffff802bea02 in cam_sim_free (sim=0xfffffe001ec2a900, > free_devq=1) at /usr/src/sys/cam/cam_sim.c:112 > #5 0xffffffff8074f8ba in umass_detach (dev=Variable "dev" is not available. > ) at /usr/src/sys/dev/usb/storage/umass.c:2183 > #6 0xffffffff8091a054 in device_detach (dev=0xfffffe001ec2e900) at > device_if.h:214 > #7 0xffffffff8075c458 in usb_detach_device (udev=0xfffffe0007ce8800, > iface_index=32 ' ', flag=Variable "flag" is not available. > ) at /usr/src/sys/dev/usb/usb_device.c:1065 > #8 0xffffffff8075c5f4 in usb_unconfigure (udev=0xfffffe0007ce8800, > flag=Variable "flag" is not available. > ) at /usr/src/sys/dev/usb/usb_device.c:455 > #9 0xffffffff8075c88e in usb_free_device (udev=0xfffffe0007ce8800, > flag=Variable "flag" is not available. > ) at /usr/src/sys/dev/usb/usb_device.c:2093 > #10 0xffffffff80764e5e in uhub_explore (udev=0xfffffe0007353800) at > /usr/src/sys/dev/usb/usb_hub.c:358 > #11 0xffffffff8074f536 in usb_bus_explore (pm=Variable "pm" is not > available. > ) at /usr/src/sys/dev/usb/controller/usb_controller.c:359 > #12 0xffffffff80769173 in usb_process (arg=Variable "arg" is not available. > ) at /usr/src/sys/dev/usb/usb_process.c:170 > #13 0xffffffff808bc2df in fork_exit (callout=0xffffffff807690a0 > <usb_process>, arg=0xffffff80007c0e88, frame=0xffffff804743cc40) at > /usr/src/sys/kern/kern_fork.c:992 > #14 0xffffffff80bc216e in fork_trampoline () at > /usr/src/sys/amd64/amd64/exception.S:602 > > > From: cam_sim_free(struct cam_sim *sim, int free_devq) > > (kgdb) l > 107 { > 108 int error; > 109 > 110 sim->refcount--; > 111 if (sim->refcount > 0) { > > 112 error = msleep(sim, sim->mtx, PRIBIO, "simfree", 0); > > 113 KASSERT(error == 0, ("invalid error value for > msleep(9)")); > 114 } > 115 > 116 KASSERT(sim->refcount == 0, ("sim->refcount == 0")); > > > It almost appears as if the cam layer is trying to finalise a write of > some sort but the physical device has already gone. > > (kgdb) p sim->refcount > $1 = 1 > > Not sure why refcount is still ==1. > > The same device in a box running 9.0-Stable (as of about 3 months ago) > with a ICH9 controller works as expected. > > Any suggestions?Do you happen to have 'camcontrol devlist -v' output for the above scenario? I have attached a patch for the pass(4) driver that might help things somewhat. The pass(4) driver won't go away completely if there is a context that has the driver open when the underlying device goes away. That might be what is holding up the SIM refcount, although I'm not certain. Ken -- Kenneth Merry ken@FreeBSD.ORG -------------- next part -------------- *** //depot/vendor/FreeBSD/stable/9/sys/cam/scsi/scsi_pass.c.orig --- //depot/vendor/FreeBSD/stable/9/sys/cam/scsi/scsi_pass.c *************** *** 76,81 **** --- 76,82 ---- pass_flags flags; u_int8_t pd_type; union ccb saved_ccb; + int open_count; struct devstat *device_stats; struct cdev *dev; struct cdev *alias_dev; *************** *** 140,151 **** static void passdevgonecb(void *arg) { struct cam_periph *periph; periph = (struct cam_periph *)arg; ! xpt_print(periph->path, "%s: devfs entry is gone\n", __func__); ! cam_periph_release(periph); } static void --- 141,183 ---- static void passdevgonecb(void *arg) { + struct cam_sim *sim; struct cam_periph *periph; + struct pass_softc *softc; + int i; periph = (struct cam_periph *)arg; + sim = periph->sim; + softc = (struct pass_softc *)periph->softc; + + KASSERT(softc->open_count >= 0, ("Negative open count %d", + softc->open_count)); + + mtx_lock(sim->mtx); + + /* + * When we get this callback, we will get no more close calls from + * devfs. So if we have any dangling opens, we need to release the + * reference held for that particular context. + */ + for (i = 0; i < softc->open_count; i++) + cam_periph_release_locked(periph); + + softc->open_count = 0; ! /* ! * Release the reference held for the device node, it is gone now. ! */ ! cam_periph_release_locked(periph); ! ! /* ! * We reference the SIM lock directly here, instead of using ! * cam_periph_unlock(). The reason is that the final call to ! * cam_periph_release_locked() above could result in the periph ! * getting freed. If that is the case, dereferencing the periph ! * with a cam_periph_unlock() call would cause a page fault. ! */ ! mtx_unlock(sim->mtx); } static void *************** *** 219,231 **** } cam_periph_unlock(periph); physpath = malloc(MAXPATHLEN, M_DEVBUF, M_WAITOK); if (xpt_getattr(physpath, MAXPATHLEN, "GEOM::physpath", periph->path) == 0 && strlen(physpath) != 0) { make_dev_physpath_alias(MAKEDEV_WAITOK, &softc->alias_dev, softc->dev, softc->alias_dev, physpath); ! } free(physpath, M_DEVBUF); /* --- 251,268 ---- } cam_periph_unlock(periph); physpath = malloc(MAXPATHLEN, M_DEVBUF, M_WAITOK); + + cam_periph_lock(periph); if (xpt_getattr(physpath, MAXPATHLEN, "GEOM::physpath", periph->path) == 0 && strlen(physpath) != 0) { + cam_periph_unlock(periph); make_dev_physpath_alias(MAKEDEV_WAITOK, &softc->alias_dev, softc->dev, softc->alias_dev, physpath); ! } else ! cam_periph_unlock(periph); ! free(physpath, M_DEVBUF); /* *************** *** 371,377 **** if (cam_periph_acquire(periph) != CAM_REQ_CMP) { xpt_print(periph->path, "%s: lost periph during " "registration!\n", __func__); ! mtx_lock(periph->sim->mtx); return (CAM_REQ_CMP_ERR); } --- 408,414 ---- if (cam_periph_acquire(periph) != CAM_REQ_CMP) { xpt_print(periph->path, "%s: lost periph during " "registration!\n", __func__); ! cam_periph_lock(periph); return (CAM_REQ_CMP_ERR); } *************** *** 464,469 **** --- 501,508 ---- return(EINVAL); } + softc->open_count++; + cam_periph_unlock(periph); return (error); *************** *** 472,484 **** static int passclose(struct cdev *dev, int flag, int fmt, struct thread *td) { struct cam_periph *periph; periph = (struct cam_periph *)dev->si_drv1; if (periph == NULL) return (ENXIO); ! cam_periph_release(periph); return (0); } --- 511,546 ---- static int passclose(struct cdev *dev, int flag, int fmt, struct thread *td) { + struct cam_sim *sim; struct cam_periph *periph; + struct pass_softc *softc; periph = (struct cam_periph *)dev->si_drv1; if (periph == NULL) return (ENXIO); ! sim = periph->sim; ! softc = periph->softc; ! ! mtx_lock(sim->mtx); ! ! softc->open_count--; ! ! cam_periph_release_locked(periph); ! ! /* ! * We reference the SIM lock directly here, instead of using ! * cam_periph_unlock(). The reason is that the call to ! * cam_periph_release_locked() above could result in the periph ! * getting freed. If that is the case, dereferencing the periph ! * with a cam_periph_unlock() call would cause a page fault. ! * ! * cam_periph_release() avoids this problem using the same method, ! * but we're manually acquiring and dropping the lock here to ! * protect the open count and avoid another lock acquisition and ! * release. ! */ ! mtx_unlock(sim->mtx); return (0); }
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