DTrace panic

[Mark Johnston]

On Mon, May 09, 2016 at 04:05:44PM +0000, Bjoern A. Zeeb wrote:
> Hi,
> 
> I am seeing this panic when trying to use DTrace on r299073.   I
> cannot rule out that it's my (experimental) environment;  just wanted
> to check if it might have been a known breakage before digging into it.

I've never seen this, FWIW. I'm currently running r299276 with some
local changes.

> 
> # dtrace -n 'dtrace:::BEGIN { printf("Hello FreeBSD!\n"); }'
> dtrace -n 'dtrace:::BEGIN { printf("Hello FreeBSD!\n"); }'
> dtrace: description 'dtrace:::BEGIN ' matched 1 probe
> kernel trap 12 with interrupts disabled
> 
> 
> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0xae
> fault code              = supervisor read data, page not present
> instruction pointer     = 0x20:0xfffff800012ebc03
> stack pointer           = 0x28:0xfffffe0000226740
> frame pointer           = 0x28:0xfffffe0000226780
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                          = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = IOPL = 0
> current process         = 576 (dtrace)
> [ thread pid 576 tid 100048 ]
> Stopped at      0xfffff800012ebc03:     addl    %eax,(%rax)
> db> where
> where
> Tracing pid 576 tid 100048 td 0xfffff80001f0f000
> dmapbase() at 0xfffff800012ebc03/frame 0xfffffe0000226780
> dtrace_xcall() at dtrace_xcall+0xb2/frame 0xfffffe00002267d0
> dtrace_fuword32() at dtrace_fuword32+0xfd66/frame 0xfffffe0000226830
> dtrace_fuword32() at dtrace_fuword32+0xa6ec/frame 0xfffffe0000226930
> dev2udev() at dev2udev+0x37ef/frame 0xfffffe0000226990
> kern_ioctl() at kern_ioctl+0x1a7/frame 0xfffffe0000226a00
> sys_ioctl() at sys_ioctl+0x171/frame 0xfffffe0000226ad0
> amd64_syscall() at amd64_syscall+0x4c6/frame 0xfffffe0000226bf0
> Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0000226bf0
> --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80125267a, rsp = 0x7fffffffe9c8, rbp = 0x7fffffffea10 ---
> 
> db> show reg
> show reg
> cs                        0x20
> ds                        0x3b
> es                        0x3b
> fs                        0x13
> gs                        0x1b
> ss                        0x28
> rax                       0xae
> rcx                          0
> rdx         0xfffffe0000817000
> rbx         0xffffffff802b43f0
> rsp         0xfffffe0000226758
> rbp         0xfffffe0000226780
> rsi         0xffffffff802b43f0
> rdi         0xfffff800012ebc00
> r8          0xfffff800012ebc00
> r9          0xfffff800012ebc00
> r10         0xfffff800012ebc00
> r11         0xfffffe00002266f8
> r12         0xffffffff80429f30  smp_no_rendevous_barrier
> r13         0xfffffe0001127000
> r14         0xfffff800012ebc00
>   -More--
> r15         0xfffff800012ebc00
> rip         0xfffff800012ebc03
> rflags                    0xae
> 0xfffff800012ebc03:     addl    %eax,(%rax)
> 
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