Messages in this thread | | | Date | Tue, 13 Apr 2004 17:50:22 +0200 | From | Peter Seiderer <> | Subject | [Bug][2.6.5] SEGV while video memory mmaped, computer hangs |
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Hello, the following short programm stops (no more input, no telnet login, etc...) my linux system (kernel 2.6.5) immediately (this is the short version of what xfree does on XF86DGADirectVideo(), mmap the video memory).
SysRq-t tells that bash hangs with the following call trace:
handle_mm_fault do_page_fault sys_wait4 sigprocmask default_wake_function sys_rt_sigprocmask default_ware_function syscall_call
Thanks in advance for your help, Peter
#include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <sys/mman.h> #include <assert.h>
int main(int argc, char *argv[]) { int fd; assert((fd = open("/dev/mem", O_RDWR)) != (-1));
size_t s = 67108864; void *m; assert((m = mmap(NULL, s, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0xd0000000)) != NULL);
char *c = 0; char a = *c; return 0; }
-- ------------------------------------------------------------------------ Peter Seiderer E-Mail: seiderer123@ciselant.de 00000000-0009fbff : System RAM 0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000cd000-000ce7ff : Extension ROM 000d0000-000d8007 : reserved 000f0000-000fffff : System ROM 00100000-1ffeffff : System RAM 00100000-0033660e : Kernel code 0033660f-003d72ff : Kernel data 1fff0000-1fff7fff : ACPI Tables 1fff8000-1fffffff : ACPI Non-volatile Storage 20000000-200003ff : 0000:00:1f.1 cb400000-db5fffff : PCI Bus #01 d0000000-d7ffffff : 0000:01:00.0 db800000-db9fffff : PCI Bus #01 db9f0000-db9fffff : 0000:01:00.0 dc000000-ddffffff : 0000:03:02.0 dfc00000-dfdfffff : 0000:03:02.0 dfec0000-dfedffff : 0000:03:04.0 dfec0000-dfedffff : e100 dfefe000-dfefefff : 0000:03:04.0 dfefe000-dfefefff : e100 dffff900-dffff9ff : 0000:00:1f.5 dffffa00-dffffbff : 0000:00:1f.5 dffffc00-dfffffff : 0000:00:1d.7 e0000000-e3ffffff : 0000:00:00.0 fec00000-fec00fff : reserved fee00000-fee00fff : reserved ffb00000-ffbfffff : reserved fff00000-ffffffff : reserved
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