Bug #2266

panic during shutdown

Added by nonsolosoft almost 5 years ago. Updated over 4 years ago.

Status:ClosedStart date:12/27/2011
Priority:NormalDue date:
Assignee:-% Done:


Target version:-


it panics during shutdown on vop_write+0x110 at movl 0x44(%edx),edx


> uname -a
DragonFly lap.diff.org 2.13-DEVELOPMENT DragonFly v2.13.0.709.g50e40-DEVELOPMENT #17: Mon Dec 26 23:03:55 CET 2011 :/usr/obj/mnt2/src/sys/GENERIC i386

Related issues

Related to Bug #2286: 3.0 release catchall ticket Closed 01/22/2012


#1 Updated by vsrinivas almost 5 years ago


It looks like the system accessed the address 0xdeadc122, which is 0xdeadc0de + 0x44; deadcode is filled in to free()d kernel memory.

The particular dereference that generated this invalid address was the extraction of the mountpoint from the vnode structure in vop_write. This means that vop_write was using an already-kfree()d vnode, which is bad news.

#2 Updated by jaydg over 4 years ago

I've experienced the same problem:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; lapic.id = 00000000
fault virtual address = 0xdeadc122
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc028913f
stack pointer = 0x10:0xd62cc6c8
frame pointer = 0x10:0xd62cc7d0
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 = 1 (init)
current thread = pri 31
kernel: type 12 trap, code=0

CPU0 stopping CPUs: 0x00000000

I have a crash dump available. It's a rather bulky 105MB xz compressed tar ball.

#3 Updated by vsrinivas over 4 years ago

Could you upload the kernel & core to someplace we can access? It'd be great help!

#4 Updated by ftigeot over 4 years ago

  • Status changed from New to In Progress
  • % Done changed from 0 to 50

Possibly fixed by commit cf7ad7d148d126095d2261798f8f289a0d170959

#5 Updated by ftigeot over 4 years ago

  • Status changed from In Progress to Closed
  • % Done changed from 50 to 100

Confirmed fixed as of today

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