------- Comment From sthou...@in.ibm.com 2017-09-21 05:27 EDT------- Pedro,
The kernel packages are hosted in: http://pokgsa.ibm.com/gsa/pokgsa/home/d/i/diegodo/web/public/156292 Can you check please -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1708451 Title: Process hangs on HW watchpoint on Power9 Status in The Ubuntu-power-systems project: In Progress Status in linux package in Ubuntu: New Bug description: == Comment: #0 - Pedro Miraglia Franco de Carval <pedro...@br.ibm.com> - 2017-06-30 12:52:06 == After setting a hardware watchpoint on a variable through gdb, the traced process gets stuck on the instruction that affects the watched address but doesn't stop. Steps to reproduce: Make a program to be traced: pedromfc@perch:~$ cat wp_test.c int my_global = 0; void main( void ) { my_global = 1; } pedromfc@perch:~$ gcc -g -O0 -o wp_test wp_test.c Debug the binary: pedromfc@perch:~$ gdb -q wp_test Reading symbols from wp_test...done. (gdb) watch my_global Hardware watchpoint 1: my_global (gdb) run Starting program: /home/pedromfc/wp_test [Program stuck here, manually interrupt] ^C Program received signal SIGINT, Interrupt. 0x00000000200007a0 in main () at wp_test.c:4 4 my_global = 1; (gdb) disas Dump of assembler code for function main: 0x0000000020000780 <+0>: addis r2,r12,2 0x0000000020000784 <+4>: addi r2,r2,30592 0x0000000020000788 <+8>: std r31,-8(r1) 0x000000002000078c <+12>: stdu r1,-48(r1) 0x0000000020000790 <+16>: mr r31,r1 0x0000000020000794 <+20>: nop 0x0000000020000798 <+24>: addi r9,r2,-32492 0x000000002000079c <+28>: li r10,1 => 0x00000000200007a0 <+32>: stw r10,0(r9) 0x00000000200007a4 <+36>: nop 0x00000000200007a8 <+40>: addi r1,r31,48 0x00000000200007ac <+44>: ld r31,-8(r1) 0x00000000200007b0 <+48>: blr 0x00000000200007b4 <+52>: .long 0x0 0x00000000200007b8 <+56>: .long 0x0 0x00000000200007bc <+60>: .long 0x1000180 End of assembler dump. (gdb) info reg r9 r9 0x20020014 537002004 (gdb) p /x &my_global $1 = 0x20020014 (gdb) continue Continuing. [Like before, nothing happens] ^C Program received signal SIGINT, Interrupt. 0x00000000200007a0 in main () at wp_test.c:4 4 my_global = 1; (gdb) disass Dump of assembler code for function main: 0x0000000020000780 <+0>: addis r2,r12,2 0x0000000020000784 <+4>: addi r2,r2,30592 0x0000000020000788 <+8>: std r31,-8(r1) 0x000000002000078c <+12>: stdu r1,-48(r1) 0x0000000020000790 <+16>: mr r31,r1 0x0000000020000794 <+20>: nop 0x0000000020000798 <+24>: addi r9,r2,-32492 0x000000002000079c <+28>: li r10,1 => 0x00000000200007a0 <+32>: stw r10,0(r9) 0x00000000200007a4 <+36>: nop 0x00000000200007a8 <+40>: addi r1,r31,48 0x00000000200007ac <+44>: ld r31,-8(r1) 0x00000000200007b0 <+48>: blr 0x00000000200007b4 <+52>: .long 0x0 0x00000000200007b8 <+56>: .long 0x0 0x00000000200007bc <+60>: .long 0x1000180 End of assembler dump. (gdb) continue Continuing. Check on another terminal that the program is running (but stuck in the same instruction): pedromfc@perch:~$ ps -C gdb,wp_test -o pid,comm,state PID COMMAND S 19178 gdb S 19193 wp_test R This happened on this machine model: cpu : POWER9 (raw), altivec supported revision : 1.0 (pvr 004e 0100) machine : PowerNV 8375-42A firmware : OPAL SN : 13C665W With this kernel: pedromfc@perch:~$ uname -a Linux perch 4.10.0-19-generic #21-Ubuntu SMP Thu Apr 6 17:03:05 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux It also happened with this kernel, on another machine: [pedromfc@zzfp342p1 ~]$ uname -a Linux zzfp342p1 4.11.0-10.el7a.ppc64le #1 SMP Wed Jun 21 20:50:21 EDT 2017 ppc64le ppc64le ppc64le GNU/Linux On another machine (P8) the watchpoint triggers as expected and the process stops immediately after the store instruction: pedromfc@genoa:~$ uname -a Linux genoa 3.13.0-35-generic #62-Ubuntu SMP Fri Aug 15 01:57:29 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux pedromfc@genoa:~$ gdb wp_test ... Reading symbols from wp_test...done. (gdb) watch my_global Hardware watchpoint 1: my_global (gdb) run Starting program: /home/pedromfc/wp_test Hardware watchpoint 1: my_global Old value = 0 New value = 1 main () at wp_test.c:5 5 } (gdb) https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=d89ba5353f301971dd7d2f9fdf25c4432728f38e To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1708451/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
