[illumos-Developer] sa_evict crash

[Steve Gonczi]

Greetings, 

I have recently seen a sa_evict() crash. Obviously the sa_evict() function 
has a panic() call in it, but no comment explaining why the author 
went to the trouble of coding this call, and apparently setting a function 
pointer to it, but taking the machine down should it ever be called. 

I am hoping someone who has fingerprints on this code would comment. 
Why is this call never supposed to be executed? 

What may the fact that it is called, indicate? 
Reference count problem? 


The stack looks like this: 

sa_evict+0x24(ffffff0716be60d8, ffffff077f666388) 
dbuf_evict_user+0x4a(ffffff0716be60d8) 
dbuf_clear+0x27(ffffff0716be60d8) 
dbuf_evict+0x16(ffffff0716be60d8) 
dnode_destroy+0xb3(ffffff0716bc6178) 
dnode_buf_pageout+0x54(ffffff0716be6558, ffffff0716bc8200) 
dbuf_evict_user+0x4a(ffffff0716be6558) 
dbuf_clear+0x27(ffffff0716be6558) 
dbuf_evict+0x16(ffffff0716be6558) 
dbuf_do_evict+0x46(ffffff0716bf0738) 
arc_do_user_evicts+0x73() 
arc_reclaim_thread+0x103() 

TIA 

Steve 
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