Re: ULE/SCHED_SMP diff for 7.0

Jeff Roberson schreef:
> 
> On Wed, 18 Jul 2007, Rene Ladan wrote:
> 
>> Jeff Roberson schreef:
>>> http://people.freebsd.org/~jeff/ule.diff
>>>
>>> This patch is scheduled for inclusion in 7.0.  I would like anyone who
>>> cares to run it to validate that it does not create any stability or
>>> performance regression over the existing ULE.  This patch replaces ULE
>>> with SCHED_SMP, which will now no longer exist as a seperate fork of
>>> ULE.
>> [..]
>>
>> I cvsupped this evening at 19:34 UTC.  The new ULE scheduler works fine
>> in single-user mode (it survives "make kernel"), but when I go to
>> multi-user mode I get a "sched_add: trying to run inhibited thread"
>> panic (2 vmcores lost due to fsck :( )
> 
> Can you get me a backtrace?  You can enable KDB and DDB in your kernel
> along with INVARIANTS.  Just type 'tr' and record the function names
> 

I found a file #165060 in /var/lost+found .  kgdb didn't eat it, but strings
could still extract the attached backtrace.  In case you want to recompile
the kernel, it is compiled with -O1 -pipe -march=prescott
-fno-strict-aliasing


Regards,
Rene
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panic: sched_add: trying to run inhibited thread
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper(c06bc9e9,e799eae0,c0500eb9,c06dbce9,1,...) at db_trace_self_wrapper+0x26
kdb_backtrace(c06dbce9,1,c06bb89d,e799eaec,1,...) at kdb_backtrace+0x29
panic(c06bb89d,1,c06bb74a,892,1,...) at panic+0x10f
tdq_add(c0730d40,9,c06bb74a,6d7,c5d94ea4,...) at tdq_add+0x45
sched_switch(c5d94cc0,c5d94000,1,180,17eab51a,...) at sched_switch+0x26e
mi_switch(1,0,c06bd5e6,1bd,c5d94cc0,...) at mi_switch+0x209
sleepq_switch(c5d94cc0,0,c06bd5e6,21b,c4d1da3c,...) at sleepq_switch+0xf8
sleepq_wait(c4d1da3c,0,c06d4a5b,3,0,...) at sleepq_wait+0x60
_sx_xlock_hard(c4d1da3c,c5d94cc0,0,c06d66d2,58,...) at _sx_xlock_hard+0x26d
_sx_xlock(c4d1da3c,0,c06d66d2,58,81eb000,...) at _sx_xlock+0xb4
_vm_map_lock(c4d1d9f8,c06d66d2,58,54,0,...) at _vm_map_lock+0x51
obreak(c5d94cc0,e799ecfc,4,c06c019f,e799ed38,...) at obreak+0xc5
syscall(e799ed38) at syscall+0x28d
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (17, FreeBSD ELF32, obreak), eip = 0x283235eb, esp = 0xbfbfe50c, ebp = 0xbfbfe538 ---