[DragonFlyBSD - Bug #1672] (Feedback) panic (trap 12) around btree_search() in 2.4.1-RELEASE

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #1672 has been updated by tuxillo.

Description updated
Category set to VFS subsystem
Status changed from New to Feedback
Assignee deleted (0)
Target version set to Unverifiable

Moving to unverifiable.
Feel free to update it if you can reproduce it.

Cheers,
Antonio Huete


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Bug #1672: panic (trap 12) around btree_search() in 2.4.1-RELEASE
http://bugs.dragonflybsd.org/issues/1672#change-12508

* Author: floid
* Status: Feedback
* Priority: Normal
* Assignee: 
* Category: VFS subsystem
* Target version: Unverifiable
----------------------------------------
Using 2.4.1 with the lone patch from http://bugs.dragonflybsd.org/issue1583

DragonFly tucker 2.4.1-RELEASE DragonFly v2.4.1.40.ga038d-RELEASE #1: Sat Jan 30
11:57:51 EST 2010     root at tucker:/usr/obj/usr/src/sys/GENERIC  i386

... I'm not sure when this occurred; possibly during nightly cleanup.
The previous evening gave HAMMER a little more stress than usual via a bit of
`undo` usage (normally none) which did seem to be turning up transient(?)
"ITERATE ENTIRE HISTORY: Unknown error: 0" results similar to
http://leaf.dragonflybsd.org/mailarchive/users/2009-09/msg00062.html (but here
the HAMMER config is left at the sane defaults).  Not intending to poke at them
too much unless it relates to the panic here.

Couldn't get a dump because I didn't realize I hadn't specified a dumpdev (doh!).

db> trace                                                                       
Debugger(c0591d40) at Debugger+0x34                                             
panic(c0576343,c059e4c3,c055d984,11,4000) at panic+0x9f                         
btree_search(d6df38e4,d6df3880,c0483897,d6df38e4,d6df38e4) at btree_search+0x14a
hammer_btree_lookup(d6df38e4) at hammer_btree_lookup+0xd9                       
hammer_btree_first(d6df38e4,c04ad0a7,19792,15,22) at hammer_btree_first+0xd     
hammer_ioc_rebalance(d6df3a74,d684cdd0,c294ed50,f4240,0) at hammer_ioc_rebalanca
hammer_ioctl(d684cdd0,c0c0680f,c294ed50,1,c28a6b28) at hammer_ioctl+0x726       
hammer_vop_ioctl(d6df3ad0,c06409c0,d2f80d50,d2f8dc50,0) at hammer_vop_ioctl+0x2f
vop_ioctl(d2f80d50,c2a12e28,c0c0680f,c294ed50,1) at vop_ioctl+0x3e              
vn_ioctl(cfe75b40,c0c0680f,c294ed50,c28a6b28,d6df3cf0) at vn_ioctl+0xe0         
mapped_ioctl(4,c0c0680f,bfbff88c,0,d6df3cf0) at mapped_ioctl+0x3e7              
sys_ioctl(d6df3cf0,6,0,0,d268c6d8) at sys_ioctl+0x17                            
syscall2(d6df3d40) at syscall2+0x1ef                                            
Xint0x80_syscall() at Xint0x80_syscall+0x36                                     



Task map 0xc0514cec: pmap=0x1e2, nentries=1946206313, version=12061300          
                                                                                
                                                                                
Fatal trap 12: page fault while in kernel mode                                  
fault virtual address   = 0x8300c08a                                            
fault code              = supervisor read, page not present                     
instruction pointer     = 0x8:0xc04a5608                                        
stack pointer           = 0x10:0xd6df359c                                       
frame pointer           = 0x10:0xd6df35a8                                       
code segment            = base 0x0, limit 0xfffff, type 0x1b                    
                        = DPL 0, pres 1, def32 1, gran 1                        
processor eflags        = interrupt enabled, resume, IOPL = 0                   
current process         = 19689 (hammer)                                        
current thread          = pri 42 (CRIT)                                         
                                                                                
kernel: type 12 trap, code=0                                                    
Stopped at      Debugger+0x34:  movb    $0,in_Debugger.4260



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