[Bug kprobes/9740] New: syscall.* probe causes kernel panic(double fault) on rawhide kernel/i686

["mhiramat at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

I've run stap -ve 'global pids; probe syscall.* {pids[pid()]<<<1}' on
2.6.29-0.31.rc1.git2.fc11.i686 and got below double fault.
---
PANIC: double fault, gdt at c34d3000 [255 bytes]
double fault, tss at c3619d80
eip = c06e4b9d, esp = f1a48f98
eax = f1a490d0, ebx = f8c5b1f0, ecx = 0000007b, edx = 00000000
esi = c0537f0e, edi = 00000000
---

I could reproduce this fault and it always happened the 2nd time of staprun. So,
how to reproduce is;
1. run stap -ve 'global pids; probe syscall.* {pids[pid()]<<<1}'
2. stop it (if you see a privilege error, don't care or remove stap module by
staprun -d)
3. run above command again.

And "c06e4b8f T do_page_fault".

c06e4b8f <do_page_fault>:
c06e4b8f:       55                      push   %ebp
c06e4b90:       89 e5                   mov    %esp,%ebp
c06e4b92:       57                      push   %edi
c06e4b93:       89 d7                   mov    %edx,%edi
c06e4b95:       56                      push   %esi
c06e4b96:       53                      push   %ebx
c06e4b97:       81 ec 24 01 00 00       sub    $0x124,%esp
c06e4b9d:       89 85 d0 fe ff ff       mov    %eax,-0x130(%ebp)

-- 
           Summary: syscall.* probe causes kernel panic(double fault) on
                    rawhide kernel/i686
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: kprobes
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: mhiramat at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=9740

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