From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020212 Description of problem: While running the bubble3d program, the kernel mga driver dereferenced a null pointer and crashed. The kernel traceback is included in the "Additional Information" section. Version-Release number of selected component (if applicable): 2.4.9-31 How reproducible: Sometimes Steps to Reproduce: 1.Run X11 4.1 on a Matrox G450 with DRI enabled and 2 screens. xinerama is disabled. 2.Run bubble3d screen saver. 3.After a random time (typically 3-7 days), the crash will occur. Additional info: Unable to handle kernel NULL pointer dereference at virtual address 00000004 printing eip: e09c6444 *pde = 00000000 Oops: 0002 Kernel 2.4.9-31 CPU: 0 EIP: 0010:[3c59x:__insmod_3c59x_S.bss_L40+822500/107766540] Tainted: P EIP: 0010:[<e09c6444>] Tainted: P EFLAGS: 00010293 EIP is at mga_freelist_put [mga] 0x74 eax: db285de0 ebx: dbef3aa0 ecx: db285740 edx: 00000000 esi: de80d7a0 edi: 00000001 ebp: de008000 esp: c7dd7f0c ds: 0018 es: 0018 ss: 0018 Process bubble3d (pid: 528, stackpage=c7dd7000) Stack: de80d7a0 00000001 e09c7e66 de008000 db280f70 f8448000 e091f898 dbef3aa0 dbef3aa0 db280f70 c7dd7f5c de80d7a0 e09c87ad de008000 db280f70 de008800 de008000 00000034 00000c60 00000001 00000000 de008000 cfd3b7a0 bfffedf0 Call Trace: [3c59x:__insmod_3c59x_S.bss_L40+829190/107759850] mga_dma_buffers [mga] 0x1136 Call Trace: [<e09c7e66>] mga_dma_buffers [mga] 0x1136 [3c59x:__insmod_3c59x_S.bss_L40+831565/107757475] mga_dma_vertex [mga] 0x18d [<e09c87ad>] mga_dma_vertex [mga] 0x18d [3c59x:__insmod_3c59x_S.bss_L40+806308/107782732] mga_ioctl [mga] 0xe4 [<e09c2504>] mga_ioctl [mga] 0xe4 [sys_ioctl+535/560] sys_ioctl [kernel] 0x217 [<c0143c87>] sys_ioctl [kernel] 0x217 [system_call+51/56] system_call [kernel] 0x33 [<c0106f3b>] system_call [kernel] 0x33 Code: 89 42 04 89 48 04 89 10 5b 31 c0 5e c3 eb 0d 90 90 90 90 90
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