Re: kern/40651: kmem_alloc() returns misaligned pointers

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR kern/40651; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: YAMAMOTO Takashi <yamt%mwd.biglobe.ne.jp@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/40651: kmem_alloc() returns misaligned pointers
Date: Mon, 16 Feb 2009 14:51:03 +0100

 On Mon, Feb 16, 2009 at 09:16:12AM +0900, YAMAMOTO Takashi wrote:
 > is it with DEBUG?
 
 Yes, it is with DEBUG.
 
 >  #if defined(KMEM_SIZE)
 > -#define     SIZE_SIZE       (min(KMEM_QUANTUM_SIZE, sizeof(size_t)))
 > +#define     SIZE_SIZE       (max(KMEM_QUANTUM_SIZE, sizeof(size_t)))
 >  static void kmem_size_set(void *, size_t);
 
 That makes it get a bit faster, but it dies later with:
 
 cgsix0: framebuffer size: 1 MB
 panic: kmem_poison_check: 0xf41cb600: 0x00 != 0x73
                                                   
 Stopped in pid 0.1 (system) at  netbsd:cpu_Debugger+0x4:        or             
 %
 o7, %g0, %g1
 db> bt      
 cpu_Debugger(0xf03b2cd0, 0xf03741d8, 0xf41cb600, 0xf03e7800, 0x104, 
0xf043d000) a
 t netbsd:kmem_poison_check+0x84
 kmem_poison_check(0xf41cb600, 0xb8, 0x0, 0x0, 0x0, 0xa) at 
netbsd:kmem_alloc+0xb
 4                                                                              
 kmem_alloc(0xf41cb600, 0x1, 0xf03e1344, 0x0, 0x0, 0xa) at 
netbsd:kmem_zalloc+0x8
                                                                                
 kmem_zalloc(0xac, 0x1, 0x0, 0xf0397730, 0xf03e1330, 0x8) at 
netbsd:config_devall
 oc+0x138                                                                       
 config_devalloc(0xf404fae0, 0xf03e3b3c, 0x0, 0xf0357018, 0xf03e470c, 0x2) at 
net
 bsd:config_attach_loc+0x10                                                     
 config_attach_loc(0xf404fae0, 0xf03e3b3c, 0x0, 0xf03e1344, 0xf031a1bc, 
0xf031a1b
 c) at netbsd:cg6attach+0x240                                                   
 cg6attach(0xf41cb008, 0xf41cb274, 0x0, 0x70, 0x0, 0xfe130000) at 
netbsd:cgsixatt
 ach+0x39c                                                                      
 cgsixattach(0xf404f248, 0xf404fae0, 0xf03e14a0, 0xf043cfe8, 0xf03e470c, 0x2) 
at n
 etbsd:config_attach_loc+0x198
 config_attach_loc(0xf404fae0, 0xf03e40dc, 0x0, 0xf03e14a0, 0xf023c3bc, 
0xf023c3b
 c) at netbsd:sbus_attach_common+0x240                                          
 sbus_attach_common(0xf40d0078, 0xf0379910, 0xffd5fa00, 0x0, 0xf03e470c, 0x2) 
at n
 ..
 
 
 Martin