Date: Fri, 14 Jun 2013 23:07:02 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Dimitry Andric <dim@freebsd.org> Cc: current@freebsd.org Subject: Re: zfs kernel panic, known incompatibilities with clang & CPUTYPE/COPTFLAGS? Message-ID: <20130614230702.00006aa0@unknown> In-Reply-To: <E9E313A1-AEA5-4926-86A2-6CEF0E7EB388@freebsd.org> References: <20130612223024.00003980@unknown> <E9E313A1-AEA5-4926-86A2-6CEF0E7EB388@freebsd.org>
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On Wed, 12 Jun 2013 22:39:53 +0200
Dimitry Andric <dim@freebsd.org> wrote:
> On Jun 12, 2013, at 22:30, Alexander Leidinger
> <Alexander@Leidinger.net> wrote:
> > I try to update from a pre-clang world (r242511M) to
> > "now" (r251618M). The resulting kernel boots, but while starting
> > some jails (with ezjail from ports, so fairly late in the boot
> > process) I get a kernel panic (IIRC zfs trying to access page 0).
>
> If you are running on i386, it might be a stack overflow? Try
> increasing the stack a little, it might help in that case.
>
> In any case, please try to get a backtrace.
The bt in the minidump is useless, but I made a bt directly
in the kernel debugger:
---snip---
Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address = 0x0
fault code = supervisor read instruction, page not present
instruction pointer = 0x20:0x0
stack pointer = 0x28:0xffffff839e79d930
frame pointer = 0x28:0xffffff839e79d9e0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 2183 (zfs)
db> bt
Tracing pid 2356
uart_sab82532_class() at 0
devfs_ioctl_f() at devfs_ioctl_f+0xf0
kern_ioctl() at kern_ioctl+0x1d7
sys_ioctl() at sys_ioctl+0x142
---snip---
Anyone with a pointer to an explanation how to convert those pointers
into source locations?
The minidump is available at
http://www.leidinger.net/test/core.txt.1.bz2
unfortunately the bt in there is crap.
Bye,
Alexander.
--
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