[Xen-devel] RE: restoretextmode crash

["Bonnell, David" <David_Bonnell@xxxxxxx>]

After porting strace to 2.6.12 I hacked it some more to sync the log
file to disk after trace entry (instead of just fflush as it was doing)
and I now get a complete system call trace (albeit after a much, much
longer wait!).  

Restoretextmode appears to crash in a call to mmap as shown by the last
few lines of the trace below.  (The full trace is attached).

open("/proc/bus/pci/01/00.0", O_RDONLY) = 4
lseek(4, 60, SEEK_SET)                  = 60
read(4, "\v\1\5\1", 4)                  = 4
close(4)                                = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0xee000) =
0xb77d7000
write(2, "Using nvidia driver, 65536KB, Ty"..., 53) = 53
open("/sys/bus/pci/devices/0000:01:00.0/resource", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb77d6000
read(4, "0x00000000ee000000 0x00000000eef"..., 4096) = 399
open("/sys/bus/pci/devices/0000:01:00.0/resource1", O_RDWR) = 5
close(4)                                = 0
munmap(0xb77d6000, 4096)                = 0
mmap2(NULL, 65536, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0xa0) =
0xb77c7000
mmap2(NULL, 67108864, PROT_READ|PROT_WRITE, MAP_SHARED, 5, 0


Regards,

Dave Bonnell
Corporate Architect
BMC Software

-----Original Message-----
From: Ian Pratt [mailto:m+Ian.Pratt@xxxxxxxxxxxx] 
Sent: Wednesday, 14 September 2005 1:04 PM
To: Bonnell, David; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Keir Fraser; ian.pratt@xxxxxxxxxxxx; ian.pratt@xxxxxxxxxxxx
Subject: RE: [UPDATE] Xen crashes

> The complete Xen boot log and strace are attached however I'm 
> not sure the strace log is complete (in fact, I'm almost 
> certain it is not!) as the latest entries may not have been 
> flushed to disk before the crash and hence lost.  (Unless Xen 
> is booted with "noreboot" the strace log file is not even created!).
> 
> The only output from restoretextmode before the crash is:
> 
>       Using nvidia driver, 65536KB, Type: GeForce (NV 11).
> 
> I'll pull down the source and compile restoretextmode/svgalib 
> with debug symbols so I can step through it in gdb until the 
> point of the "bang".

It looks like it's going at it through /proc/pci raher than /dev/mem. I
seem to recall we fixed the memmap functions od /dev/mem a couple of
weeks back, but I wander if read/write have been attended to?

Having the fragment of source that's causing the crash would be useful
to target the search.

Ian

Attachment: xen-restoretextmode-strace.log
Description: xen-restoretextmode-strace.log

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