Here is another wierd bug -- four gnat1 process stuck at exactly the same location making zero forward progress. I have seen this a number of times, so I thought it would be useful to report. As far as I can tell, all are stuck in the kernel. Gdb can't step the code, nor do breaks on the next instruction ever get hit. This may have something to do with the fact that the instruction is trying to read from text (C switch statement). This is with 2.6.39.1 with James' last two, but I have also seen this without the patches. Machine is rp3440. Dave -- J. David Anglin dave.anglin@xxxxxxxxxxxxxx National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
dave@mx3210:~/gnu/gcc/objdir$ top top - 20:31:28 up 1 day, 9:54, 2 users, load average: 4.01, 3.62, 3.42 Tasks: 97 total, 5 running, 92 sleeping, 0 stopped, 0 zombie Cpu(s): 92.0%us, 4.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 4.0%si, 0.0%st Mem: 10288332k total, 2741856k used, 7546476k free, 603552k buffers Swap: 979928k total, 0k used, 979928k free, 1727896k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 14022 dave 20 0 87484 11m 9644 R 100 0.1 1176:59 gnat1 14017 dave 20 0 88728 13m 9792 R 93 0.1 1174:19 gnat1 14027 dave 20 0 93068 18m 9.9m R 93 0.2 1196:54 gnat1 14012 dave 20 0 87900 12m 9680 R 86 0.1 1070:21 gnat1 dave@mx3210:~/gnu/gcc/objdir$ gdb prev-gcc/gnat1 14012 GNU gdb (GDB) 7.2-debian Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "hppa-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /home/dave/gnu/gcc/objdir/prev-gcc/gnat1...done. Attaching to program: /home/dave/gnu/gcc/objdir/prev-gcc/gnat1, process 14012 Reading symbols from /usr/lib/libmpc.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpc.so.2 Reading symbols from /usr/lib/libmpfr.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpfr.so.4 Reading symbols from /usr/lib/libgmp.so.10...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgmp.so.10 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 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 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) bt #0 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 #1 0x0408afd8 in diagnostic_report_diagnostic (context=0x4e3ed98, diagnostic=0xfdf98a88) at ../../gcc/gcc/diagnostic.c:451 #2 0x0408b968 in warning (opt=290, gmsgid=0x4234818 "padding struct to align %q+D") at ../../gcc/gcc/diagnostic.c:676 #3 0x020e3fa0 in place_field (rli=0x4e5a288, field=0x402c9f60) at ../../gcc/gcc/stor-layout.c:1151 #4 0x020ed9bc in layout_type (type=0x4e5a288) at ../../gcc/gcc/stor-layout.c:2047 #5 0x020ed9bc in layout_type (type=0x4e5a288) at ../../gcc/gcc/stor-layout.c:2047 Backtrace stopped: previous frame identical to this frame (corrupt stack?) (gdb) step ^C Program received signal SIGINT, Interrupt. 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) stepi ^C Program received signal SIGINT, Interrupt. 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) disass $pc-32,$pc+32 Dump of assembler code from 0x4087ac4 to 0x4087b04: 0x04087ac4 <option_enabled+88>: stw ret0,8(r3) 0x04087ac8 <option_enabled+92>: ldw 8(r3),ret0 0x04087acc <option_enabled+96>: cmpib,=,n 0,ret0,0x4087b6c <option_enabled+256> 0x04087ad0 <option_enabled+100>: ldw 10(r3),ret0 0x04087ad4 <option_enabled+104>: ldw 30(ret0),ret0 0x04087ad8 <option_enabled+108>: cmpib,<<,n 3,ret0,0x4087b6c <option_enabled+256> 0x04087adc <option_enabled+112>: ldil L%4087800,r19 0x04087ae0 <option_enabled+116>: ldo 2ec(r19),r19 => 0x04087ae4 <option_enabled+120>: ldw,s ret0(r19),r19 0x04087ae8 <option_enabled+124>: bv,n r0(r19) 0x04087aec <option_enabled+128>: # 4087afc 0x04087af0 <option_enabled+132>: # 4087b10 0x04087af4 <option_enabled+136>: # 4087b2c 0x04087af8 <option_enabled+140>: # 4087b4c 0x04087afc <option_enabled+144>: ldw 8(r3),ret0 0x04087b00 <option_enabled+148>: ldw 0(ret0),ret0 End of assembler dump. (gdb) p/x $ret0 $1 = 0x0 (gdb) p/x $r19 $2 = 0x4087aec (gdb) break *0x04087ae8 Breakpoint 1 at 0x4087ae8: file ../../gcc/gcc/opts-common.c, line 1170. (gdb) c Continuing. ^C Program received signal SIGINT, Interrupt. 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) p/x $pc $3 = 0x4087ae4 (gdb) p/x $r19 $4 = 0x4087aec (gdb) x/x $r19 0x4087aec <option_enabled+128>: 0x04087afc dave@mx3210:/proc/14012$ cat maps 00010000-0490c000 r-xp 00000000 08:07 1204766 /home/dave/gnu/gcc/objdir/prev-gcc/gnat1 0490c000-0491d000 rwxp 048fc000 08:07 1204766 /home/dave/gnu/gcc/objdir/prev-gcc/gnat1 0491d000-04f6d000 rwxp 00000000 00:00 0 [heap] 40000000-40037000 rw-p 00000000 00:00 0 4003b000-4008f000 r-xp 00000000 08:05 298712 /usr/lib/libmpfr.so.4.0.0 4008f000-40091000 rwxp 00053000 08:05 298712 /usr/lib/libmpfr.so.4.0.0 40091000-40111000 rw-p 00000000 00:00 0 4013e000-4015e000 r-xp 00000000 08:05 25181 /lib/ld-2.11.2.so 4015e000-40162000 rwxp 00020000 08:05 25181 /lib/ld-2.11.2.so 40162000-4016d000 rw-p 00000000 00:00 0 40193000-4019e000 rw-p 00000000 00:00 0 401e5000-401e8000 r-xp 00000000 08:05 25170 /lib/libdl-2.11.2.so 401e8000-401e9000 rwxp 00003000 08:05 25170 /lib/libdl-2.11.2.so 40232000-40246000 r-xp 00000000 08:05 299656 /usr/lib/libmpc.so.2.0.0 40246000-40247000 rwxp 00013000 08:05 299656 /usr/lib/libmpc.so.2.0.0 40247000-40347000 rw-p 00000000 00:00 0 40435000-40497000 r-xp 00000000 08:05 298658 /usr/lib/libgmp.so.10.0.1 40497000-4049e000 rwxp 00062000 08:05 298658 /usr/lib/libgmp.so.10.0.1 405eb000-40744000 r-xp 00000000 08:05 25182 /lib/libc-2.11.2.so 40744000-4074a000 rwxp 00159000 08:05 25182 /lib/libc-2.11.2.so 4074a000-4074d000 rwxp 00000000 00:00 0 4074d000-407a0000 rw-p 00000000 00:00 0 408e5000-40a5a000 r--p 00000000 08:05 314648 /usr/lib/locale/locale-archive fdf8d000-fe013000 rwxp 00000000 00:00 0 [stack] dave@mx3210:/proc/14012$ cat smaps 00010000-0490c000 r-xp 00000000 08:07 1204766 /home/dave/gnu/gcc/objdir/prev-gcc/gnat1 Size: 74736 kB Rss: 8932 kB Pss: 2264 kB Shared_Clean: 8928 kB Shared_Dirty: 0 kB Private_Clean: 0 kB Private_Dirty: 4 kB Referenced: 8932 kB Anonymous: 4 kB AnonHugePages: 0 kB Swap: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB Locked: 0 kB ---------------------------------------- dave@mx3210:~/gnu/gcc/objdir$ gdb prev-gcc/gnat1 14017 GNU gdb (GDB) 7.2-debian Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "hppa-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /home/dave/gnu/gcc/objdir/prev-gcc/gnat1...done. Attaching to program: /home/dave/gnu/gcc/objdir/prev-gcc/gnat1, process 14017 Reading symbols from /usr/lib/libmpc.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpc.so.2 Reading symbols from /usr/lib/libmpfr.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpfr.so.4 Reading symbols from /usr/lib/libgmp.so.10...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgmp.so.10 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 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 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) disass $pc-32,$pc+32 Dump of assembler code from 0x4087ac4 to 0x4087b04: 0x04087ac4 <option_enabled+88>: stw ret0,8(r3) 0x04087ac8 <option_enabled+92>: ldw 8(r3),ret0 0x04087acc <option_enabled+96>: cmpib,=,n 0,ret0,0x4087b6c <option_enabled+256> 0x04087ad0 <option_enabled+100>: ldw 10(r3),ret0 0x04087ad4 <option_enabled+104>: ldw 30(ret0),ret0 0x04087ad8 <option_enabled+108>: cmpib,<<,n 3,ret0,0x4087b6c <option_enabled+256> 0x04087adc <option_enabled+112>: ldil L%4087800,r19 0x04087ae0 <option_enabled+116>: ldo 2ec(r19),r19 => 0x04087ae4 <option_enabled+120>: ldw,s ret0(r19),r19 0x04087ae8 <option_enabled+124>: bv,n r0(r19) 0x04087aec <option_enabled+128>: # 4087afc 0x04087af0 <option_enabled+132>: # 4087b10 0x04087af4 <option_enabled+136>: # 4087b2c 0x04087af8 <option_enabled+140>: # 4087b4c 0x04087afc <option_enabled+144>: ldw 8(r3),ret0 0x04087b00 <option_enabled+148>: ldw 0(ret0),ret0 End of assembler dump. ---------------------------------------- dave@mx3210:~/gnu/gcc/objdir$ gdb prev-gcc/gnat1 14022 GNU gdb (GDB) 7.2-debian Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "hppa-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /home/dave/gnu/gcc/objdir/prev-gcc/gnat1...done. Attaching to program: /home/dave/gnu/gcc/objdir/prev-gcc/gnat1, process 14022 Reading symbols from /usr/lib/libmpc.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpc.so.2 Reading symbols from /usr/lib/libmpfr.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpfr.so.4 Reading symbols from /usr/lib/libgmp.so.10...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgmp.so.10 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 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 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) disass $pc-32,$pc+32 Dump of assembler code from 0x4087ac4 to 0x4087b04: 0x04087ac4 <option_enabled+88>: stw ret0,8(r3) 0x04087ac8 <option_enabled+92>: ldw 8(r3),ret0 0x04087acc <option_enabled+96>: cmpib,=,n 0,ret0,0x4087b6c <option_enabled+256> 0x04087ad0 <option_enabled+100>: ldw 10(r3),ret0 0x04087ad4 <option_enabled+104>: ldw 30(ret0),ret0 0x04087ad8 <option_enabled+108>: cmpib,<<,n 3,ret0,0x4087b6c <option_enabled+256> 0x04087adc <option_enabled+112>: ldil L%4087800,r19 0x04087ae0 <option_enabled+116>: ldo 2ec(r19),r19 => 0x04087ae4 <option_enabled+120>: ldw,s ret0(r19),r19 0x04087ae8 <option_enabled+124>: bv,n r0(r19) 0x04087aec <option_enabled+128>: # 4087afc 0x04087af0 <option_enabled+132>: # 4087b10 0x04087af4 <option_enabled+136>: # 4087b2c 0x04087af8 <option_enabled+140>: # 4087b4c 0x04087afc <option_enabled+144>: ldw 8(r3),ret0 0x04087b00 <option_enabled+148>: ldw 0(ret0),ret0 End of assembler dump. ---------------------------------------- dave@mx3210:~/gnu/gcc/objdir$ gdb prev-gcc/gnat1 14027 GNU gdb (GDB) 7.2-debian Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "hppa-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /home/dave/gnu/gcc/objdir/prev-gcc/gnat1...done. Attaching to program: /home/dave/gnu/gcc/objdir/prev-gcc/gnat1, process 14027 Reading symbols from /usr/lib/libmpc.so.2...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpc.so.2 Reading symbols from /usr/lib/libmpfr.so.4...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libmpfr.so.4 Reading symbols from /usr/lib/libgmp.so.10...(no debugging symbols found)...done. Loaded symbols for /usr/lib/libgmp.so.10 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 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 0x04087ae4 in option_enabled (opt_idx=290, opts=0x4e3dd14) at ../../gcc/gcc/opts-common.c:1170 1170 switch (option->var_type) (gdb) disass $pc-32,$pc+32 Dump of assembler code from 0x4087ac4 to 0x4087b04: 0x04087ac4 <option_enabled+88>: stw ret0,8(r3) 0x04087ac8 <option_enabled+92>: ldw 8(r3),ret0 0x04087acc <option_enabled+96>: cmpib,=,n 0,ret0,0x4087b6c <option_enabled+256> 0x04087ad0 <option_enabled+100>: ldw 10(r3),ret0 0x04087ad4 <option_enabled+104>: ldw 30(ret0),ret0 0x04087ad8 <option_enabled+108>: cmpib,<<,n 3,ret0,0x4087b6c <option_enabled+256> 0x04087adc <option_enabled+112>: ldil L%4087800,r19 0x04087ae0 <option_enabled+116>: ldo 2ec(r19),r19 => 0x04087ae4 <option_enabled+120>: ldw,s ret0(r19),r19 0x04087ae8 <option_enabled+124>: bv,n r0(r19) 0x04087aec <option_enabled+128>: # 4087afc 0x04087af0 <option_enabled+132>: # 4087b10 0x04087af4 <option_enabled+136>: # 4087b2c 0x04087af8 <option_enabled+140>: # 4087b4c 0x04087afc <option_enabled+144>: ldw 8(r3),ret0 0x04087b00 <option_enabled+148>: ldw 0(ret0),ret0 End of assembler dump.
