[Bug 193367] [panic] sleeping thread

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193367

--- Comment #2 from sasamotikomi at gmail.com ---
core.txt.15
FreeBSD 9.1-RELEASE-p6
panic: sleeping thread
Unread portion of the kernel message buffer:
Sleeping thread (tid 100889, pid 3535) owns a non-sleepable lock
KDB: stack backtrace of thread 100889:
#0 0xc0ac8fe9 at mi_switch+0x139
#1 0xc0afe12e at sleepq_switch+0xce
#2 0xc0afec9e at sleepq_timedwait+0x3e
#3 0xc0ac95e2 at _sleep+0x2a2
#4 0xc0d1c686 at swap_pager_getpages+0x3e6
#5 0xc0d28611 at vm_fault_hold+0x1031
#6 0xc0d29cbb at vm_fault+0x8b
#7 0xc0e255df at trap_pfault+0x1df
#8 0xc0e2646a at trap+0x44a
#9 0xc0e0fa4c at calltrap+0x6
#10 0xc7fe7b5a at drm_ioctl+0x2ca
#11 0xc09a44ea at devfs_ioctl_f+0x10a
#12 0xc0b05480 at kern_ioctl+0x2a0
#13 0xc0b055f4 at sys_ioctl+0x134
#14 0xc0e25b7a at syscall+0x34a
#15 0xc0e0fab1 at Xint0x80_syscall+0x21
panic: sleeping thread
cpuid = 0
KDB: stack backtrace:
#0 0xc0af3e5f at kdb_backtrace+0x4f
#1 0xc0ac088f at panic+0x16f
#2 0xc0b01e86 at propagate_priority+0x106
#3 0xc0b02c98 at turnstile_wait+0x2c8
#4 0xc0aaea5c at _mtx_lock_sleep+0x1ec
#5 0xc0aaee2c at _mtx_lock_flags+0x4c
#6 0xc7feaf8d at drm_lock+0xad
#7 0xc7fe7bfb at drm_ioctl+0x36b
#8 0xc09a44ea at devfs_ioctl_f+0x10a
#9 0xc0b05480 at kern_ioctl+0x2a0
#10 0xc0b055f4 at sys_ioctl+0x134
#11 0xc0e25b7a at syscall+0x34a
#12 0xc0e0fab1 at Xint0x80_syscall+0x21

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