DragonFly BSD
DragonFly bugs List (threaded) for 2004-04
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Re: nfs + msdosfs = crashes & panics


To: Chris Pressey <cpressey@xxxxxxxxxxxxxxx>
From: Jeffrey Hsu <hsu@xxxxxxxxxxx>
Date: Tue, 13 Apr 2004 17:39:24 -0700

Chris Pressey wrote:

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x34
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01c0009
stack pointer = 0x10:0xc927486c
frame pointer = 0x10:0xc92748b8
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 = 456 (nfsd)
current thread = pri 10 interrupt mask = none
panic: from debugger

#0  0xc017937e in dumpsys ()
(kgdb) bt
#0  0xc017937e in dumpsys ()
#1  0xc0179173 in boot ()
#2  0xc01795a4 in poweroff_wait ()
#3  0xc0129989 in db_panic ()
#4  0xc0129927 in db_command ()
#5  0xc01299f3 in db_command_loop ()
#6  0xc012bfb1 in db_trap ()
#7  0xc02aea66 in kdb_trap ()
#8  0xc02bfe8e in trap_fatal ()
#9  0xc02bf90f in trap ()
#10 0xc01c0009 in msdosfs_write ()
#11 0xc0209488 in nfsrv_write ()
#12 0xc021da8a in nfssvc_nfsd ()
#13 0xc021d385 in nfssvc ()
#14 0xc02c01d6 in syscall2 ()
#15 0xc02afa6a in Xint0x80_syscall ()

You're probably indirecting though a non-existent proc-related structure. The protocol threads don't have a proc structure associated with them. Before, there were a bunch of places which incorrectly used curproc to check things like credentials. All the places are going to core dump now. I've fixed a bunch of places which incorrectly used curthread, but there are still some left.




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