ZFS + nullfs + Linuxulator = panic?

[Paul Mather]

On Feb 14, 2012, at 7:47 PM, Konstantin Belousov wrote:

> On Tue, Feb 14, 2012 at 09:38:18AM -0500, Paul Mather wrote:
>> I have a problem with RELENG_8 (FreeBSD/amd64 running a GENERIC kernel, last built 2012-02-08).  It will panic during the daily periodic scripts that run at 3am.  Here is the most recent panic message:
>> 
>> Fatal trap 9: general protection fault while in kernel mode
>> cpuid = 0; apic id = 00
>> instruction pointer     = 0x20:0xffffffff8069d266
>> stack pointer           = 0x28:0xffffff8094b90390
>> frame pointer           = 0x28:0xffffff8094b903a0
>> code segment            = base 0x0, limit 0xfffff, type 0x1b
>>                        = DPL 0, pres 1, long 1, def32 0, gran 1
>> processor eflags        = resume, IOPL = 0
>> current process         = 72566 (ps)
>> trap number             = 9
>> panic: general protection fault
>> cpuid = 0
>> KDB: stack backtrace:
>> #0 0xffffffff8062cf8e at kdb_backtrace+0x5e
>> #1 0xffffffff805facd3 at panic+0x183
>> #2 0xffffffff808e6c20 at trap_fatal+0x290
>> #3 0xffffffff808e715a at trap+0x10a
>> #4 0xffffffff808cec64 at calltrap+0x8
>> #5 0xffffffff805ee034 at fill_kinfo_thread+0x54
>> #6 0xffffffff805eee76 at fill_kinfo_proc+0x586
>> #7 0xffffffff805f22b8 at sysctl_out_proc+0x48
>> #8 0xffffffff805f26c8 at sysctl_kern_proc+0x278
>> #9 0xffffffff8060473f at sysctl_root+0x14f
>> #10 0xffffffff80604a2a at userland_sysctl+0x14a
>> #11 0xffffffff80604f1a at __sysctl+0xaa
>> #12 0xffffffff808e62d4 at amd64_syscall+0x1f4
>> #13 0xffffffff808cef5c at Xfast_syscall+0xfc
> 
> Please look up the line number for the fill_kinfo_thread+0x54.


Is there a way for me to do this from the above information?  As I said in the original message, I failed to get a crash dump after reboot (because, it turns out, I hadn't set up my gmirror swap device properly).  Alas, with the latest panic, it appears to have hung[1] during the "Dumping" phase, so it looks like I won't get a saved crash dump this time, either. :-(

Speaking of the latest panic, here it is:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x308
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff806026ef
stack pointer           = 0x28:0xffffff8094acd2d0
frame pointer           = 0x28:0xffffff8094acd350
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         = 20992 (df)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff8062cf8e at kdb_backtrace+0x5e
#1 0xffffffff805facd3 at panic+0x183
#2 0xffffffff808e6c20 at trap_fatal+0x290
#3 0xffffffff808e6f71 at trap_pfault+0x201
#4 0xffffffff808e742f at trap+0x3df
#5 0xffffffff808cec64 at calltrap+0x8
#6 0xffffffff80602e1e at _sx_xlock+0x4e
#7 0xffffffff80f9ca35 at rrw_enter+0xa5
#8 0xffffffff80f9ce86 at zfs_statfs+0x46
#9 0xffffffff80681258 at __vfs_statfs+0x28
#10 0xffffffff81476521 at nullfs_statfs+0x51
#11 0xffffffff80681258 at __vfs_statfs+0x28
#12 0xffffffff80690b22 at kern_statfs+0x1b2
#13 0xffffffff80690c77 at statfs+0x37
#14 0xffffffff808e62d4 at amd64_syscall+0x1f4
#15 0xffffffff808cef5c at Xfast_syscall+0xfc


Cheers,

Paul.

[1] Not quite hung solid: when I press the power button I get this appearing on the console:

acpi0: suspend request ignored (not ready yet)
acpi0: request to enter state S5 failed (err 6)