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#239 /lib/udev/iphone-set-info consumes 99% CPU
====Quote from Launchpad====
Here's the htop output showing iphone-set-info spinning at 99% CPU.
622 root 18 -2 50496 3340 2168 R 99.0 0.1 22h17:18 /lib/udev/iphone-set-info
This happens a lot and whenever I feel my machine is sluggish I check for this and kill it.
0 #> uname -a
Linux ice 2.6.32-24-generic #38-Ubuntu SMP Mon Jul 5 09:20:59 UTC 2010 x86_64 GNU/Linux
0 #> cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.04
DISTRIB_CODENAME=lucid
DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS"
ii libgpod-common 0.7.93-0ubuntu1 common files for libgpod
ii libgpod4 0.7.93-0ubuntu1 library to read and write songs and artwork
More info about this bug: https://bugs.launchpad.net/ubuntu/+source/libgpod/+bug/611020
Could you install the debugging packages for libplist, libimobiledevice and libgpod, and attach gdb when this happens to get a backtrace of where it's stuck? (gdb --pid .... as root, and then "thread apply all bt" to get the backtrace)
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Ok, but keep in mind that I haven' t yet recognized a pattern to reproduce the bug.
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To reproduce the bug I repeatedly connect and disconnect Iphone's usb cord.
Here's gdb output:
(gdb) thread apply all bt
Thread 1 (Thread 0x7f795d8e7700 (LWP 7953)):
#0 0x00007f795d4dee72 in send () from /lib/libpthread.so.0
#1 0x00007f795b3708bb in usbmuxd_send () from /usr/lib/libusbmuxd.so.1
#2 0x00007f795ca8a01d in internal_connection_send ()
from /usr/lib/libimobiledevice.so.0
#3 0x00007f795ca8a0fa in internal_ssl_write ()
from /usr/lib/libimobiledevice.so.0
#4 0x00007f795bbac5da in ?? () from /usr/lib/libgnutls.so.26
#5 0x00007f795bba978d in _gnutls_send_int () from /usr/lib/libgnutls.so.26
#6 0x00007f795bbc607d in gnutls_alert_send () from /usr/lib/libgnutls.so.26
#7 0x00007f795bba9c43 in gnutls_bye () from /usr/lib/libgnutls.so.26
#8 0x00007f795ca89a59 in idevice_connection_disable_ssl ()
from /usr/lib/libimobiledevice.so.0
#9 0x00007f795ca8a357 in idevice_disconnect ()
from /usr/lib/libimobiledevice.so.0
#10 0x00007f795ca8bf46 in property_list_service_client_free ()
from /usr/lib/libimobiledevice.so.0
#11 0x00007f795ca8e2c9 in lockdownd_client_free ()
from /usr/lib/libimobiledevice.so.0
#12 0x0000000000401582 in ?? ()
#13 0x0000000000401302 in ?? ()
#14 0x00007f795c71fc4d in __libc_start_main () from /lib/libc.so.6
#15 0x00000000004011b9 in ?? ()
#16 0x00007fff4cdec398 in ?? ()
#17 0x000000000000001c in ?? ()
#18 0x0000000000000001 in ?? ()
#19 0x00007fff4cdecd4d in ?? ()
#20 0x0000000000000000 in ?? ()
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There's a comment about segfaulting: https://bugs.launchpad.net/gtkpod/+bug/611020/comments/4
I installed the debug packages and started a plug/unplug cycle to get it to happen and saw iphone-set-info is segfaulting:
2010-08-10 08:58:12 usb 1-7 USB disconnect, address 15
2010-08-10 08:58:12 usb 1-7 new high speed USB device using ehci_hcd and address 16
2010-08-10 08:58:12 hub 1-0 .0: unable to enumerate USB device on port 7
2010-08-10 08:58:13 usb 5-1 new full speed USB device using uhci_hcd and address 3
2010-08-10 08:58:13 usb 5-1 not running at top speed; connect to a high speed hub
2010-08-10 08:58:13 usb 5-1 configuration #1 chosen from 4 choices
2010-08-10 08:58:14 iphone-set-info[28589]: segfault at 18 ip 00007fbaf56be156 sp 00007fff5ef5ac00 error 6 in libimobiledevice.so.0.0.0[7fbaf56b8000+14000]
2010-08-10 08:58:14 usb 5-1 USB disconnect, address 3
2010-08-10 08:58:18 usb 1-7 new high speed USB device using ehci_hcd and address 17
2010-08-10 08:58:18 hub 1-0 .0: unable to enumerate USB device on port 7
2010-08-10 08:58:18 usb 1-7 new high speed USB device using ehci_hcd and address 18
2010-08-10 08:58:18 usb 1-7 configuration #1 chosen from 4 choices
2010-08-10 08:58:20 usb 1-7 USB disconnect, address 18
2010-08-10 08:58:20 usb 1-7 new high speed USB device using ehci_hcd and address 19
2010-08-10 08:58:21 hub 1-0 .0: unable to enumerate USB device on port 7
2010-08-10 08:58:21 usb 5-1 new full speed USB device using uhci_hcd and address 4
2010-08-10 08:58:21 usb 5-1 not running at top speed; connect to a high speed hub
2010-08-10 08:58:21 usb 5-1 configuration #1 chosen from 4 choices
And for now, the CPU burn is not happening.
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