[Bug runtime/14630] New: intermittent crash in lookup_bad_addr

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

http://sourceware.org/bugzilla/show_bug.cgi?id=14630

             Bug #: 14630
           Summary: intermittent crash in lookup_bad_addr
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


On a x86-64 rhel6 vm, the following was observed during a make installcheck
against git stap:

stap_fda8d28487545b13195688c63e0e9bc_13886: systemtap: 2.0/0.152, base:
ffffffffa0705000, memory: 57data/29text/20ctx/2058net/34alloc kb, probes: 28
stap_ad67448ddd1c1c3d62320c81d6c3737_14107: systemtap: 2.0/0.152, base:
ffffffffa0722000, memory: 57data/29text/20ctx/2058net/34alloc kb, probes: 28
stap_92468660093a64382aac155c65fae81c_14360: systemtap: 2.0/0.152, base:
ffffffffa03ef000, memory: 78data/59text/20ctx/2058net/178alloc kb, probes: 28
BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1112
in_atomic(): 0, irqs_disabled(): 1, pid: 14360, name: stapio
INFO: lockdep is turned off.
irq event stamp: 0
hardirqs last  enabled at (0): [<(null)>] (null)
hardirqs last disabled at (0): [<ffffffff8106cf44>] copy_process+0x604/0x15d0
softirqs last  enabled at (0): [<ffffffff8106cf44>] copy_process+0x604/0x15d0
softirqs last disabled at (0): [<(null)>] (null)
Pid: 14360, comm: stapio Not tainted 2.6.32-279.5.2.el6.x86_64.debug #1
Call Trace:
 [<ffffffff810ab580>] ? print_irqtrace_events+0xd0/0xe0
 [<ffffffff810582b7>] ? __might_sleep+0xf7/0x130
 [<ffffffff810444a4>] ? __do_page_fault+0x114/0x4e0
 [<ffffffff8118522a>] ? mem_cgroup_bad_page_check+0x1a/0x30
 [<ffffffff8113b57f>] ? get_page_from_freelist+0x35f/0x8e0
 [<ffffffff81534c9e>] ? do_page_fault+0x3e/0xa0
 [<ffffffff81531dd5>] ? page_fault+0x25/0x30
 [<ffffffffa03f01cd>] ? lookup_bad_addr+0xcd/0xe0
[stap_92468660093a64382aac155c65fae81c_14360]
 [<ffffffffa03f24d0>] ? probe_4103+0x230/0x2b0
[stap_92468660093a64382aac155c65fae81c_14360]
 [<ffffffffa03f2405>] ? probe_4103+0x165/0x2b0
[stap_92468660093a64382aac155c65fae81c_14360]
 [<ffffffffa03fa0d8>] ? enter_real_tracepoint_probe_0+0x148/0x300
[stap_92468660093a64382aac155c65fae81c_14360]
 [<ffffffffa03ef1ee>] ? enter_tracepoint_probe_0+0xe/0x10
[stap_92468660093a64382aac155c65fae81c_14360]
 [<ffffffff8152e3de>] ? thread_return+0x709/0x7db
 [<ffffffff8152fb55>] ? schedule_hrtimeout_range+0x145/0x170
 [<ffffffffa03f0753>] ? _stp_ctl_poll_cmd+0x33/0x60
[stap_92468660093a64382aac155c65fae81c_14360]
 [<ffffffff811ac629>] ? poll_schedule_timeout+0x39/0x60
 [<ffffffff811acf19>] ? do_select+0x5a9/0x6d0
 [<ffffffff811ac970>] ? do_select+0x0/0x6d0
 [<ffffffff811ac720>] ? __pollwait+0x0/0xf0

This was apparently the systemtap.stress/conversions_trace.stp test case.

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