I've a multi-threading application which crashes sometimes the application on a read(). The read() is done on a TCP stream socket. Linux is 2.4.4 (denx). This is the post mortem dump of gdb:
GNU gdb 5.1.1 Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "ppc-linux"... warning: core file may not match specified executable file. Core was generated by `/bin/liwf_mpip'. Program terminated with signal 11, Segmentation fault. Reading symbols from /lib/libc.so.6...done. Loaded symbols for /lib/libc.so.6 Reading symbols from /lib/ld.so.1...done. Loaded symbols for /lib/ld.so.1 #0 0x0ff7c2e8 in read () from /lib/libc.so.6 (gdb) bt #0 0x0ff7c2e8 in read () from /lib/libc.so.6 #1 0x10009ce8 in read (fd=8, buf=0x7f5fef08, count=12) at wrapsyscall.c:153 #2 0x10004324 in liwf_receive_process_data (arg=0x8) at liwf_mpip_main.c:281 #3 0x10004f1c in pthread_start_thread (arg=0x200) at manager.c:291 #4 0x0ff899d0 in clone () from /lib/libc.so.6 (gdb) info reg r0 0x3 3 r1 0x7f5feed0 2136993488 r2 0xc03f8000 -1069580288 r3 0x200 512 r4 0x7f5fef08 2136993544 r5 0xc 12 r6 0x10 16 r7 0x7f5feee8 2136993512 r8 0x0 0 r9 0x7f5fffff 2136997887 r10 0x0 0 r11 0x7f5feec0 2136993472 r12 0x20444082 541343874 r13 0x1002b610 268613136 r14 0x7fdf000 134082560 r15 0x0 0 r16 0x10020c30 268569648 r17 0x10020d8c 268569996 r18 0x0 0 r19 0x8 8 r20 0x100042e8 268452584 r21 0x1002d41c 268620828 r22 0x24 36 r23 0x10020000 268566528 r24 0x10020000 268566528 r25 0x1000 4096 r26 0x30 48 r27 0x8 8 r28 0x7f5fef08 2136993544 r29 0xc 12 r30 0x7f5ff508 2136995080 r31 0x7f5fef08 2136993544 pc 0xff7c2e8 267895528 ps 0xd932 55602 cr 0x30444082 809779330 lr 0x10009ce8 268475624 ctr 0x0 0 xer 0x20000000 536870912 (gdb) disass Dump of assembler code for function read: 0xff7c2e0 <read>: li r0,3 0xff7c2e4 <read+4>: sc 0xff7c2e8 <read+8>: bnslr <====== crash location 0xff7c2ec <read+12>: b 0xfed000c <__libc_start_main+524> End of assembler dump. r3 value is incorrect? (should be 8 on entry, but will also contain the return value if the system call), r4 is the buffer address (is ok), and r5 is requested buffer length. So what is the exact reason of the crash? -- willy ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
