Messages in this thread | | | From | "Raj, Ashok" <> | Subject | RE: reading from invalid mem... | Date | Fri, 30 Jul 1999 13:55:13 -0700 |
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Ok... here are more details... this is strace output and look below for stack trace i got outa kernel debugger. looks like elf_dump is doing something bad..
D:\temp>^cat trace.out execve("./a", ["./a"], [/* 23 vars */]) = 0 brk(0) = 0x804955c open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=27707, ...}) = 0 mmap(0, 27707, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40015000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0755, st_size=1282102, ...}) = 0 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3"..., 4096) = 4096 mmap(0, 1022396, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4001c000 mprotect(0x4010e000, 31164, PROT_NONE) = 0 mmap(0x4010e000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xf1000) = 0x4010e000 mmap(0x40113000, 10684, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOU S, -1, 0) = 0x40113000 close(3) = 0 mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x401160 00 mprotect(0x4001c000, 991232, PROT_READ|PROT_WRITE) = 0 mprotect(0x4001c000, 991232, PROT_READ|PROT_EXEC) = 0 munmap(0x40015000, 27707) = 0 personality(PER_LINUX) = 0 getpid() = 548 brk(0) = 0x804955c brk(0x80496fc) = 0x80496fc brk(0x804a000) = 0x804a000 fstat(1, {st_mode=S_IFREG|0644, st_size=1389, ...}) = 0 mmap(0, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x400150 00 --- SIGSEGV (Segmentation fault) --- kdb> btp 548 EBP Caller Function(args) 0xc69c1c30 0xc0111c89 schedule() 0xc69c1c54 0xc01cff68 __down(0xc68a8d0c, 0xc68a8d0c, 0xc68e9700, 0xc0135077, 0x0) 0xc69c1f0c 0xc0135464 __down_failed(0xc6d51440, 0xc69c1ec0, 0x34) 0xc69c1fbc 0xc01079f4 elf_core_dump(0xb, 0xc69c1fc4) 0xbffffb38 0xc0107bfc do_signal(0x401115e0, 0x0, 0x40015000, 0xbffffb84, 0x1) kdb> go Jul 30 06:36:24 nglinux2 kernel: restarting cpu 1 for kdb
> -----Original Message----- > From: Tim Waugh [mailto:tim@cyberelk.demon.co.uk] > Sent: Friday, July 30, 1999 1:20 PM > To: Raj, Ashok > Subject: RE: reading from invalid mem... > > > On Fri, 30 Jul 1999, Raj, Ashok wrote: > > > F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY > TIME COMMAND > > 200 0 599 571 4 0 1108 336 down_f D > tty1 0:00 ./a > > Okay. 'down_f' is short for 'down_failed', i.e. we're waiting on a > semaphore. What do you see when you run the program under strace? > > Tim. > */ >
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