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Bug#730004: kfreebsd-image-9.2-1-686: "service stop wdm" crashes kernel occasionally: "Sleeping thread owns a non-sleepable lock"



Package: kfreebsd-image-9.2-1-686
Version: 9.2-1
Severity: grave

Dear kFreeBSD Porters,

running "service wdm stop" crashes the kernel with an approximately
25% percent chance on my ASUS EeeBox. Managed to trigger it twice in a
row (i.e. second time directly after reboot), but then again it took 6
or 7 start/stop runs to reproduce it again.

Kernel messages (bright white on console):

Sleeping thread (tid 100165, pid 5722) owns a non-sleepable lock
KDB: stack backtrace of thread 100165:
panic: sleeping thread
cpuid = 0
KDB: stack backtrace:
#0 0xc0f33dec at __func__.11990+0x23
Uptime: 26min21
Automatic reboot in 15 seconds […]

So far this did not happen when stopping kdm or xdm, but then again I
may not have tried these often enough.

I installed wdm newly today on that box, so the fact that I can't
remember having such issues in the past may be cause by wdm not being
installed, but also by a newer kernel. (ca. 70 days uptime before the
boot where it crashed for the first time. Can figure out details about
the previously running kernel before these crashes started after the
fsck is over.)

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (600, 'testing'), (110, 'experimental')
Architecture: kfreebsd-i386 (i386)

Kernel: kFreeBSD 9.2-1-686
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages kfreebsd-image-9.2-1-686 depends on:
ii  devd           9.2-1
ii  freebsd-utils  9.2-1
ii  kbdcontrol     9.2-1
ii  kldutils       9.2-1

Versions of packages kfreebsd-image-9.2-1-686 recommends:
ii  libc0.1-i686  2.17-96

kfreebsd-image-9.2-1-686 suggests no packages.

-- no debconf information


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